List of chess openings

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This is a list of chess openings, organised by the Encyclopaedia of Chess Openings (ECO) code classification system. The chess openings are categorised into five broad areas ("A" through "E"), with each of those broken up into one hundred subcategories ("00" through "99"). The openings were published in five volumes of ECO, with volumes labeled "A" through "E".

White first moves other than 1.e4, 1.d4 (A00–A39)

• White first moves other than 1.c4 (A00–A09): Atypical openings
• 1.c4: English Opening (A10–A39)

1.d4 without 1...d5 or 1...Nf6: Atypical Semi-Closed Games (A40–A99)

• 1.d4 without 1...d5, 1...Nf6 or 1...f5: Atypical replies to 1.d4 (A40–A44)
• 1.d4 Nf6 without 2.c4: Atypical replies to 1...Nf6 (A45–A49)
• 1.d4 Nf6 2.c4 without 2...e6 or 2...g6: Atypical Indian systems (A50–A79)
• 1.d4 f5: Dutch Defence (A80–A99)

White first moves other than 1.e4, 1.d4, 1.c4:

1. Anderssen: 1.a3
   1. Anderssen, Polish Gambit: 1.a3 a5 2.b4
   2. Anderssen, Hippopotamus: 1.a3 e5 2.b3 d5 3.c3 Nf6 4.d3 Nc6 5.e3 Bd6 6.f3 0-0 7.g3
   3. Anderssen, Shy: 1.a3 e5 2.g3 d5 3.Bg2 Nf6 4.d3 Nc6 5.Nd2 Bd6 6.e3 0-0 7.h3
   4. Anderssen, Reversed Nimzowitsch or Battambang: 1.a3 e5 2.Nc3
2. Ware: 1.a4
   1. Ware, Symmetric: 1.a4 a5
   2. Ware, Wing Gambit: 1.a4 b5 2.axb5 Bb7
   3. Ware, Cologne Gambit: 1.a4 b6 2.d4 d5 3.Nc3 Nd7
   4. Ware Gambit: 1.a4 e5 2.a5 d5 3.e3 f5 4.a6
   5. Ware, Crab 1.a4 e5 2.h4
   6. Ware, Meadow Hay Trap: 1.a4 e5 2.Ra3
3. Polish: 1.b4
   1. Polish, Symmetrical: 1.b4 b5
      1. Polish, Symmetrical, Queen’s Knight’s Gambit: 1.b4 b5 2.a4
   2. Polish, Birmingham Gambit: 1.b4 c5
   3. Polish, Outflank: 1.b4 c6
      1. Polish, Outflank, Schühler Gambit: 1.b4 c6 2.Bb2 a5 3.b5 cxb5 4.e4
   4. Polish, Baltic: 1.b4 d5 2.Bb2 Bf5
   5. Polish, Myers: 1.b4 d5 2.Bb2 c6 3.a4
   6. Polish, German: 1.b4 d5 2.Bb2 Qd6
   7. Polish, Bugayev: 1.b4 e5 2.a3
   8. Polish, Wolferts Gambit: 1.b4 e5 2.Bb2 c5
   9. Polish, Czech: 1.b4 e5 2.Bb2 d6
   10. Polish, Bugayev Advance: 1.b4 e5 2.Bb2 f6 3.b5
   11. Polish, Tartakower Gambit: 1.b4 e5 2.Bb2 f6 3.e4
   12. Polish, Queenside play: 1.b4 e6 2.Bb2 Nf6 3.b5 a6
       1. Polish, Queenside play, Rooks Exchange Line: 1.b4 e6 2.Bb2 Nf6 3.b5 a6 4.a4 axb5 5.axb5 Rxa1 6.Bxa1
       2. Polish, Queenside play, Queen's Indian Setup: 1.b4 e6 2.Bb2 Nf6 3.b5 b6
       3. Polish, Queenside play, Schiffler-Sokolsky: 1.b4 e6 2.Bb2 Nf6 3.b5 d5 4.e3
   13. Polish, Dutch Setup: 1.b4 f5
   14. Polish, Grigorian: 1.b4 Nc6
   15. Polish, King's Indian Setup: 1.b4 Nf6 2.Bb2 g6
       1. Polish, King's Indian Setup, Sokolsky: 1.b4 Nf6 2.Bb2 g6 3.c4 Bg7 4.e3 d6 5.Nf3 0-0 6.d4
       2. Polish, King's Indian Setup, Schiffler: 1.b4 Nf6 2.Bb2 g6 3.e4
   16. Polish, Karniewski: 1.b4 Nh6
4. Saragossa: 1.c3
5. Mieses: 1.d3
   1. Mieses, Venezolana: 1.d3 c5 2.Nc3 Nc6 3.g3
   2. Mieses, Reversed Rat: 1.d3 e5
      1. Mieses, Reversed Rat, Valencia: 1.d3 e5 2.Nd2
   3. Mieses, Myers Spike Attack: 1.d3 g6 2.g4
6. Van't Kruijs: 1.e3
   1. Van't Kruijs, Reversed French, Bouncing Bishop: 1.e3 e5 2.Bc4 b5 3.Bb3
   2. Van't Kruijs, Reversed French, Amsterdam Attack: 1.e3 e5 2.c4 d6 3.Nc3 Nc6 4.b3 Nf6
   3. Van't Kruijs, Reversed French, Keoni-Hiva Gambit, Ekolu: 1.e3 e5 2.Nc3 d5 3.f4 exf4 4.Nf3
   4. Van't Kruijs, Reversed French, Keoni-Hiva Gambit, Alua: 1.e3 e5 2.Nc3 Nc6 3.f4 exf4 4.Nf3
   5. Van't Kruijs, Reversed French, Keoni-Hiva Gambit, Akahi: 1.e3 e5 2.Nc3 Nf6 3.f4 exf4 4.Nf3
7. Barnes: 1.f3
   1. Barnes, Gedult Gambit 1: 1.f3 d5 2.e4 g6 3.d4 dxe4 4.c3
   2. Barnes, Fool's Mate: 1.f3 e5 2.g4 Qh4#
   3. Barnes, Hammerschlag: 1.f3 e5 2.Kf2
   4. Barnes, Gedult Gambit 2: 1.f3 f5 2.e4 fxe4 3.Nc3
8. Hungarian: 1.g3
   1. Hungarian, Sicilian Invitation: 1.g3 c5
   2. Hungarian, Reversed Modern: 1.g3 d5 2.Bg2 c5
      1. Hungarian, Reversed Modern, Slav Formation: 1.g3 d5 2.Bg2 c6
      2. Hungarian, Reversed Modern, Bücker Gambit: 1.g3 d5 2.Bg2 e5 3.b4
      3. Hungarian, Reversed Modern, Winterberg Gambit: 1.g3 d5 2.Bg2 e5 3.c4 dxc4 4.b3
      4. Hungarian, Reversed Modern, Catalan Formation: 1.g3 d5 2.Bg2 e6
   3. Hungarian, Burk Gambit: 1.g3 e5 2.a3 d5 3.Nf3 e4 4.Nh4 Be7 5.d3
   4. Hungarian, Reversed Alekhine: 1.g3 e5 2.Nf3
      1. Hungarian, Reversed Alekhine, Reversed Brooklyn or Benkő Gambit: 1.g3 e5 2.Nf3 e4 3.Ng1 Nf6 4.b4
      2. Hungarian, Reversed Alekhine, Reversed Norwegian: 1.g3 e5 2.Nf3 e4 3.Nh4
   5. Hungarian, Paris Gambit: 1.g3 e5 2.Nh3 d5 3.f4 Bxh3 4.Bxh3 exf4 5.0-0
   6. Hungarian, Dutch Invitation: 1.g3 f5
      1. Hungarian, Dutch Invitation, Pachman Gambit: 1.g3 f5 2.e4 fxe4 3.Qh5+ g6
   7. Hungarian, Myers: 1.g3 g5
   8. Hungarian, Symmetrical Variation: 1.g3 g6
   9. Hungarian, Lasker Simul Special: 1.g3 h5
      1. Hungarian, Lasker Simul Special, Van Kuijk Gambit: 1.g3 h5 2.Nf3 h4
   10. Hungarian, Asten Gambit: 1.g3 Nc6 2.Nc3 d5 3.d4 e5 4.dxe5 d4 5.Ne4 f5
   11. Hungarian, Indian Invitation: 1.g3 Nf6
9. Grob: 1.g4
   1. Grob Gambit: 1.g4 d5 2.Bg2
      1. Grob Gambit, Fritz Gambit: 1.g4 d5 2.Bg2 Bxg4 3.c4
         1. Grob Gambit, Fritz Gambit, Romford Countergambit: 1.g4 d5 2.Bg2 Bxg4 3.c4 d4
      2. Grob Gambit Declined: 1.g4 d5 2.Bg2 c6
         1. Grob Gambit Declined, Richter-Grob Gambit: 1.g4 d5 2.Bg2 c6 3.c4 dxc4 4.b3
         2. Grob Gambit Declined, Spike Attack: 1.g4 d5 2.Bg2 c6 3.g5
      3. Grob Gambit, Keres Gambit: 1.g4 d5 2.Bg2 e5 3.d4 exd4 4.c3
      4. Grob Gambit, Basman Gambit: 1.g4 d5 2.Bg2 h5 3.gxh5
   2. Grob, Zilbermints Gambit: 1.g4 d5 2.e4 dxe4 3.Nc3
      1. Grob, Zilbermints-Hartlaub Gambit: 1.g4 d5 2.e4 dxe4 3.Nc3 e5 4.d3
      2. Grob, Zilbermints Gambit, Schiller: 1.g4 d5 2.e4 dxe4 3.Nc3.h5
   3. Grob, Keene: 1.g4 d5 2.h3 e5 3.Bg2 c6
      1. Grob, Keene, Main Line: 1.g4 d5 2.h3 e5 3.Bg2 c6 4.d4 e4 5.c4 Bd6 6.Nc3 Ne7
   4. Grob, Spike: 1.g4 e5
      1. Grob, Spike, Hurst Attack: 1.g4 e5 2.Bg2 d5 3.c4
      2. Grob, Spike, London: 1.g4 e5 2.h3 Nc6
   5. Alessi Gambit: 1.g4 f5
   6. Double Grob: 1.g4 g5
      1. Double Grob, Coca-Cola Gambit: 1.g4 g5 2.f4
      2. Double Grob, King’s Knight’s Gambit: 1.g4 g5 2.h4
10. Clemenz: 1.h3
    1. Clemenz, Creepy Crawly Formation: 1.h3 d5 2.a3
    2. Clemenz, Global Opening: 1.h3 e5 2.a3
    3. Clemenz, Symmetrical: 1.h3 h5
       1. Clemenz, Symmetrical, , Spike Lee Gambit: 1.h3 h5 2.g4
11. Kádas or Desprez: 1.h4
    1. Kádas, Koola-Koola: 1.h4 a5
    2. Kádas Gambit 1: 1.h4 c5 2.b4
    3. Kádas, Myers: 1.h4 d5 2.d4 c5 3.e4
    4. Kádas Gambit 2: 1.h4 d5 2.d4 c5 3.Nf3 cxd4 4.c3
    5. Kádas Beginner's Trap: 1.h4 d5 2.Rh3
    6. Kádas Gambit 3: 1.h4 e5 2.d4 exd4 3.c3
    7. Kádas, Steinbok Gambit: 1.h4 f5 2.e4 fxe4 3.d3
    8. Kádas, Schneider Gambit: 1.h4 g5
12. Sodium Attack or Durkin: 1.Na3
    1. Sodium Attack, Celadon: 1.Na3 e5 2.d3 Bxa3 3.bxa3 d5 4.e3 c5 5.Rb1
    2. Durkin Gambit: 1.Na3 e5 2.Nc4 Nc6 3.e4 f5
    3. Sodium Attack, Chenoboskion: 1.Na3 g6 2.g4
13. Van Geet or Dunst: 1.Nc3
    1. Van Geet, Laroche Gambit: 1.Nc3 b5
    2. Van Geet, Düsseldorf Gambit: 1.Nc3 c5 2.b4
    3. Van Geet, Novosibirsk: 1.Nc3 c5 2.d4 cxd4 3.Qxd4 Nc6 4.Qh4
    4. Van Geet, Sicilian Two Knights: 1.Nc3 c5 2.Nf3 Nc6 3.d4 cxd4 4.Nxd4
    5. Van Geet, Twyble Attack: 1.Nc3 c5 2.Rb1
    6. Van Geet, Venezolana: 1.Nc3 d5 2.d3 Nf6 3.g3
    7. Van Geet, Sleipnir Gambit: 1.Nc3 d5 2.e3 e5 3.d4 Bb4
    8. Van Geet, Hector Gambit: 1.Nc3 d5 2.e4 dxe4 3.Bc4
    9. Dunst-Perrenet Gambit: 1.Nc3 d5 2.e4 dxe4 3.d3
    10. Van Geet, Dougherty Gambit: 1.Nc3 d5 2.e4 dxe4 3.f3
    11. Van Geet, Melleby Gambit: 1.Nc3 d5 2.f4 d4 3.Ne4 c5
    12. Van Geet, Pfeiffer Gambit: 1.Nc3 d5 2.f4 d4 3.Ne4 e5
        1. Van Geet, Pfeiffer Gambit, Sleipnir Countergambit: 1.Nc3 d5 2.f4 d4 3.Ne4 e5 4.Nf3
    13. Van Geet, Jendrossek Gambit: 1.Nc3 d5 2.f4 d4 3.Ne4 f5 4.Nf2 Nf6 5.Nf3 c5 6.b4
    14. Van Geet, Damhaug Gambit: 1.Nc3 d5 2.f4 e5
    15. Van Geet, Warsteiner Gambit: 1.Nc3 d5 2.f4 g5
    16. Van Geet, Hergert Gambit: 1.Nc3 d6 2.f4 e5 3.fxe5 Nc6
    17. Van Geet, Reversed Nimzowitsch: 1.Nc3 e5
        1. Van Geet, Reversed Nimzowitsch, Gladbacher Gambit: 1.Nc3 e5 2.b3 d5 3.e4 dxe4 4.d3
        2. Van Geet, Reversed Nimzowitsch, Reversed Scandinavian: 1.Nc3 e5 2.d4 exd4 3.Qxd4 Nc6 4.Qa4
        3. Van Geet, Reversed Nimzowitsch, Hulsemann Gambit: 1.Nc3 e5 2.e3 d5 3.Qh5 Be6
        4. Van Geet, Reversed Nimzowitsch, Liebig Gambit: 1.Nc3 e5 2.e3 d5 3.Qh5 Nf6
        5. Van Geet, Reversed Nimzowitsch, Nowokunski Gambit: 1.Nc3 e5 2.f4 exf4 3.e4
        6. Van Geet, Reversed Nimzowitsch, Billockus-Johansen Gambit: 1.Nc3 e5 2.Nf3 Bc5
        7. Van Geet, Reversed Nimzowitsch, Napoleon Attack: 1.Nc3 e5 2.Nf3 Nc6 3.d4
    18. Van Geet, Klüver Gambit: 1.Nc3 f5 2.e4 fxe4 3.d3
    19. Van Geet, Myers: 1.Nc3 g6 2.h4
    20. Van Geet, Tübingen Gambit: 1.Nc3 Nf6 2.g4
14. Amar: 1.Nh3

1. 1. Amar, Paris Gambit, Gent Gambit: 1.Nh3 d5 2.g3 e5 3.f4 Bxh3 4.Bxh3 exf4 5.0-0 fxg3 6.hxg3

1. Larsen's Opening, Polish Set-Up: 1.b3 b5
2. Larsen's Opening, Symmetrical: 1.b3 b6
3. Larsen's Opening, English Setup: 1.b3 c5
4. Larsen's Opening, Classical: 1.b3 d5
   1. Larsen's Opening, Classical, Graz Attack: 1.b3 d5 2.Ba3
5. Larsen's Opening, Modern: 1.b3 e5
   1. Larsen's Opening, Modern, Pachman Gambit: 1.b3 e5 2.Bb2 Nc6 3.f4
6. Larsen's Opening, Dutch Setup: 1.b3 f5
   1. Larsen's Opening, Dutch Setup, Ringelbach Gambit: 1.b3 f5 2.Bb2 e6 3.e4
7. Larsen's Opening, Indian Setup: 1.b3 Nf6
   1. Larsen's Opening, Indian Setup, Spike: 1.b3 Nf6 2.Bb2 g6 3.g4

1. Bird, Myers Defense: 1.f4 b5
2. A03 Bird, Dutch: 1.f4 d5
   1. Bird, Dutch, Thomas Gambit: 1.f4 d5 2.b3 Nf6 3.Bb2 d4 4.Nf3 c5 5.e3
   2. Bird, Dutch, Sturm Gambit: 1.f4 d5 2.c4
   3. Bird, Dutch, Williams Gambit: 1.f4 d5 2.e4
      1. Bird, Dutch, Accepted Williams Gambit: 1.f4 d5 2.e4 dxe4 3.Nc3 Nf6
      2. Bird, Dutch, Accepted Williams Gambit, Zilbermints Gambit: 1.f4 d5 2.e4 dxe4 3.Nc3 Nf6 4.Nge2
   4. Bird, Dutch, Dudweiler Gambit: 1.f4 d5 2.g4
   5. Bird, Dutch, Lasker: 1.f4 d5 2.Nf3 Nf6 3.e3 c5
3. Bird, From's Gambit: 1.f4 e5
   1. Bird, From's Gambit, Siegener Gambit: 1.f4 e5 2.d4 exd4 3.Nf3 c5 4.c3
   2. Bird, From's Gambit, Lasker Variation: 1.f4 e5 2.fxe5 d6 3.exd6 Bxd6 4.Nf3 g5
   3. Bird, From's Gambit, Lipke Variation: 1.f4 e5 2.fxe5 d6 3.exd6 Bxd6 4.Nf3 Nh6 5.d4
   4. Bird, From's Gambit, Langheld Gambit: 1.f4 e5 2.fxe5 d6 3.exd6 Nf6
   5. Bird, From's Gambit, Lasker Gambit: 1.f4 e5 2.fxe5 f6
   6. Bird, From's Gambit, Schlechter Gambit: 1.f4 e5 2.fxe5 Nc6
   7. Bird, From's Gambit, Platz Gambit: 1.f4 e5 2.fxe5 Ne7
   8. Bird, From's Gambit, Bahr Gambit: 1.f4 e5 2.Nc3
   9. Bird, From's Gambit, Double Duck Formation: 1.f4 e5 2.d4 d5
4. Bird, Symmetrical: 1.f4 f5
   1. Bird, Symmetrical, Wagner-Zwitersch Gambit: 1.f4 f5 2.e4
      1. Bird, Symmetrical, Wagner-Zwitersch Gambit, Swiss Gambit: 1.f4 f5 2.e4 fxe4 3.Nc3 Nf6 4.g4
   2. Bird, Symmetrical, King’s Bishop’s Gambit: 1.f4 f5 2.g4
5. Bird, Hobbs Gambit: 1.f4 g5
6. Bird, Hobbs-Zilbermints Gambit: 1.f4 h6 2.Nf3 g5
7. Bird, Mujannah: 1.f4 Nf6 2.c4
8. Bird, Batavo-Polish Attack: 1.f4 Nf6 2.Nf3 g6 3.b4
9. Bird, Horsefly: 1.f4 Nh6

1. Zukertort, Ware: 1.Nf3 a5
2. Zukertort, St. George: 1.Nf3 a6
3. Zukertort, Polish: 1.Nf3 b5
4. Zukertort, Queenside Fianchetto Variation: 1.Nf3 b6
5. Zukertort, Sicilian Invitation: 1.Nf3 c5
   1. Zukertort, Sicilian Invitation, Semi-Averbakh: 1.Nf3 c5 2.c4 g6 3.d4 Bg7 4.e4
      1. Zukertort, Sicilian Invitation, Semi-Averbakh, Pterodactyl: 1.Nf3 c5 2.c4 g6 3.d4 Bg7 4.e4 4...Qa5+
      2. Zukertort, Sicilian Invitation, Semi-Averbakh, Polish: 1.Nf3 c5 2.c4 g6 3.d4 Bg7 4.e4 4...Qb6
   2. Zukertort, Sicilian Invitation, Speelsmet Gambit: 1.Nf3 c5 2.d4 cxd4 3.e3
   3. Zukertort, Sicilian Invitation, Colle System: Rhamphorhynchus: 1.Nf3 c5 2.e3 g6 3.d4 Bg7 4.dxc5 Qa5+
6. Zukertort, Slav Invitation: 1.Nf3 c6
7. Zukertort, Pirc Invitation: 1.Nf3 d6
   1. Zukertort, Pirc Invitation, Vos Gambit: 1.Nf3 d6 2.d4 e5
   2. Zukertort, Pirc Invitation, Wade: 1.Nf3 d6 2.e4 Bg4
8. Zukertort, Ross Gambit: 1.Nf3 e5
   1. Zukertort, Ross Gambit, The Walrus: 1.Nf3 e5 2.Nxe5 Nc6 3.Nxc6 dxc6
9. Zukertort, Queen's Gambit Invitation: 1.Nf3 e6
   1. Zukertort, Queen's Gambit Invitation, Shabalov Gambit: 1.Nf3 e6 2.c4 a6 3.Nc3 c5 4.g3 b5
10. Zukertort, Dutch Setup: 1.Nf3 f5
    1. Zukertort, Dutch Setup, Lisitsyn Gambit Deferred: 1.Nf3 f5 2.d3 Nf6 3.e4
    2. Zukertort, Dutch Setup, Lisitsyn Gambit: 1.Nf3 f5 2.e4
11. Zukertort, Arctic Defense: 1.Nf3 f6
    1. Zukertort, Arctic Defense, Drunken Knight Variation: Zukertort, Arctic Defense 2.e4 Nh6 3.d4 Nf7
12. Zukertort, Herrstrom Gambit: 1.Nf3 g5
13. Zukertort, Kingside Fianchetto: 1.Nf3 g6
14. Zukertort, Basman Defense: 1.Nf3 h6
15. Zukertort, Sicilian Knight Variation: 1.Nf3 Na6 2.e4 c5
16. Zukertort, Drunken Cavalry Variation: 1.Nf3 Na6 2.e4 Nh6
17. Zukertort, Black Mustang Defense: 1.Nf3 Nc6
18. Zukertort, Kingside Variation: 1.Nf3 Nh6 2.d4 g6
19. A05 Zukertort, Double King-Knight: 1.Nf3 Nf6
    1. Zukertort, Double King-Knight, Myers Polish Attack: 1.Nf3 Nf6 2.a4 g6 3.b4
    2. Zukertort, Double King-Knight, Nimzo-Larsen: 1.Nf3 Nf6 2.b3
    3. Zukertort, Double King-Knight, Polish Setup: 1.Nf3 Nf6 2.b4
    4. Zukertort, Double King-Knight, Quiet System: 1.Nf3 Nf6 2.e3
    5. Zukertort, Double King-Knight, Lemberger Gambit: 1.Nf3 Nf6 2.e4
    6. Zukertort, Double King-Knight, King's Indian Setup: 1.Nf3 Nf6 2.g3
    7. Zukertort, Double King-Knight, King's Indian Setup, Spassky Variation: 1.Nf3 Nf6 2.g3 b5
    8. Zukertort, Double King-Knight, King's Indian Setup, Symmetrical: 1.Nf3 Nf6 2.g3 g6
       1. Zukertort, Double King-Knight, King's Indian Setup, Symmetrical, Double Fianchetto Attack: 1.Nf3 Nf6 2.g3 g6 3.b3 Bg7 4.Bb2 0-0 5.Bg2 d6 6.0-0
       2. Zukertort, Double King-Knight, King's Indian Setup, Symmetrical, Smyslov: 1.Nf3 Nf6 2.g3 g6 3.b4
       3. Zukertort, Double King-Knight, King's Indian Setup, Symmetrical, Wahls: 1.Nf3 Nf6 2.g3 g6 3.Bg2 Bg7 4.0-0 0-0 5.d3 d5
20. A06 Zukertort, Réti Opening: 1.Nf3 d5
    1. Zukertort, Réti Opening, Santasiere's Folly: 1.Nf3 d5 2.b3
    2. Zukertort, Réti Opening, Tennison Gambit: 1.Nf3 d5 2.e4
    3. Zukertort, Réti Opening, The Potato: 1.Nf3 d5 2.a4
    4. Zukertort, Réti Opening, Classical: 1.Nf3 d5 2.b3
       1. Zukertort, Réti Opening, Classical, Regina-Nu Gambit: 1.Nf3 d5 2.b3 c5 3.c4 dxc4 4.Nc3
       2. Zukertort, Réti Opening, Classical, Norfolk Gambit: 1.Nf3 d5 2.b3 c5 3.e4
       3. Zukertort, Réti Opening, Classical, Delayed Norfolk Gambit: 1.Nf3 d5 2.b3 Nf6 3.Bb2 c5 4.e4
    5. Zukertort, Réti Opening, Old Indian: 1.Nf3 d5 2.d3
    6. Zukertort, Réti Opening, Pachman Gambit: 1.Nf3 d5 2.e3 c5 3.c4 dxc4 4.b3
    7. Zukertort, Réti Opening, Reversed Mexican: 1.Nf3 d5 2.Nc3
       1. Zukertort, Réti Opening, Perfect Reversed Mexican: 1.Nf3 d5 2.Nc3 c5
    8. Zukertort, Réti Opening, Ampel: 1.Nf3 d5 2.Rg1
    9. A07 Zukertort, Réti Opening, Barcza System: 1.Nf3 d5 2.g3
       1. Zukertort, Réti Opening, Barcza System, Sicilian Setup: 1.Nf3 d5 2.g3 c5
       2. Zukertort, Réti Opening, Barcza System, Yugoslav: 1.Nf3 d5 2.g3 d5 3.Bg2 c6 4.0-0 Bg4
       3. Zukertort, Réti Opening, Barcza System, Omega-Delta Gambit: 1.Nf3 d5 2.g3 e5
       4. Zukertort, Réti Opening, Barcza System, Double Fianchetto: 1.Nf3 d5 2.g3 g6
          1. Zukertort, Réti Opening, Barcza System, Double Fianchetto, Pachman System: 1.Nf3 d5 2.g3 g6 3.Bg2 Bg7 4.0-0 e5 5.d3 Ne7
       5. Zukertort, Réti Opening, Barcza System, Wiedenhagen-Beta Gambit: 1.Nf3 d5 2.g3 g5
       6. Zukertort, Réti Opening, Barcza System, Keres: 1.Nf3 d5 2.g3 Bg4
       7. A08 Zukertort, Barcza System, Sicilian Setup, Fianchetto: 1.Nf3 d5 2.g3 c5 3.Bg2
          1. Zukertort, Barcza System, Sicilian Setup, Fianchetto, Reversed Grünfeld: 1.Nf3 d5 2.g3 c5 3.Bg2 Nc6 4.d4
    10. A09 Zukertort: 1.Nf3 d5 2.c4:
        1. Zukertort, Zilbermints Gambit: 1.Nf3 d5 2.c4 b5
        2. Zukertort, Advance: 1.Nf3 d5 2.c4 d4
           1. Zukertort, Advance, Michel Gambit: 1.Nf3 d5 2.c4 d4 3.b4 c5
           2. Zukertort, Advance, Reversed Blumenfeld Gambit: 1.Nf3 d5 2.c4 d4 3.e3 c5 4.b4
           3. Zukertort, Advance, Penguin Variation: 1.Nf3 d5 2.c4 d4 3.Rg1
        3. Zukertort, Réti Gambit: 1.Nf3 d5 2.c4 dxc4
           1. Zukertort, Réti Gambit, Keres: 1.Nf3 d5 2.c4 dxc4 3.e3 Be6

1. English, Jaenisch Gambit: 1.c4 b5
2. English, Anglo-Scandinavian: 1.c4 d5
   1. English, Anglo-Scandinavian, Löhn Gambit: 1.c4 d5 2.cxd5 e6
   2. English, Anglo-Scandinavian, Schulz Gambit: 1.c4 d5 2.cxd5 Nf6
   3. English, Anglo-Scandinavian, Malvinas: 1.c4 d5 2.cxd5 Qxd5 3.Nc3 Qa5
3. English, Anglo-Dutch Defense: 1.c4 f5
   1. English, Anglo-Dutch Defense, Hickmann Gambit: 1.c4 f5 2.e4
   2. English, Anglo-Dutch Defense, Wade Gambit: 1.c4 f5 2.g4
   3. English, Anglo-Dutch Defense, Ferenc Gambit: 1.c4 f5 2.Nc3 Nf6 3.e4
   4. English, Anglo-Dutch Defense, Porcupine: 1.c4 f5 2.Nc3 Nf6 3.e4 fxe4 4.g4
   5. English, Anglo-Dutch Defense, Chabanon Gambit: 1.c4 f5 2.Nf3 d6 3.e4
4. English, Myers: 1.c4 g5
   1. English, Myers Gambit: 1.c4 g5 2.d4 Bg7
   2. English, Myers, Zilbermints Gambit: 1.c4 g5 2.d4 e5
5. English, Great Snake: 1.c4 g6
   1. English, Great Snake, Adorján: 1.c4 g6 2.e4 e5
6. English, Anglo-Lithuanian: 1.c4 Nc6
7. A11 English, Caro-Kann Defensive System: 1.c4 c6
8. A12 English, Caro-Kann Defensive System, Anglo-Slav: 1.c4 c6 2.Nf3 d5 3.b3
   1. English, Caro-Kann Defensive System, Anglo-Slav, London Defensive System: 1.c4 c6 2.Nf3 d5 3.b3 Nf6 4.g3 Bf5
   2. English, Caro-Kann Defensive System, Anglo-Slav, Torre: 1.c4 c6 2.Nf3 d5 3.b3 Nf6 4.g3 Bg4
   3. English, Caro-Kann Defensive System, Anglo-Slav, Capablanca: 1.c4 c6 2.Nf3 d5 3.b3 Nf6 4.Bb2 Bg4
   4. English, Caro-Kanin Defensive System, Anglo-Slav, Bled Variation: 1.c4 c6 2.Nf3 d5 3.b3 Nf6 4.Bb2 g6
   5. English, Caro-Kann Defensive System, Anglo-Slav, New York: 1.c4 c6 2.Nf3 d5 3.b3 Nf6 4.Bb2 Bf5
   6. English, Caro-Kann Defensive System, Anglo-Slav, Bogoljubow: 1.c4 c6 2.Nf3 d5 3.b3 Bg4
9. A13 English, Kurajica: 1.c4 e6
   1. English, Kurajica, Wimpy: 1.c4 e6 2.Nf3 Nf6 3.b3 d5 4.Bb2 c5 5.e3
   2. English, Kurajica, Agincourt: 1.c4 e6 2.Nf3 Nf6 3.g3
      1. English, Kurajica, Agincourt, Catalan: 1.c4 e6 2.Nf3 Nf6 3.g3 b6 4.Bg2 Bb7 5.0-0
      2. English, Kurajica, Agincourt, Catalan Defense Accepted: 1.c4 e6 2.Nf3 Nf6 3.g3 d5 4.Bg2 dxc4
      3. English, Kurajica, Agincourt, Semi-Slav: 1.c4 e6 2.Nf3 Nf6 3.g3 d5 4.Bg2 c6
      4. English, Kurajica, Agincourt, Queen's Indian Setup: 1.c4 e6 2.Nf3 Nf6 3.g3 b6 4.Bg2 Bb7
      5. English, Kurajica, Agincourt, Romanishin: 1.c4 e6 2.Nf3 Nf6 3.g3 a6
      6. English, Kurajica, Agincourt, Romanishin Gambit: 1.c4 e6 2.Nf3 Nf6 3.g3 a6 4.Bg2 b5
      7. A14 English, Kurajica, Agincourt, Neo-Catalan: 1.c4 e6 2.Nf3 d5 3.g3 Nf6
         1. English, Kurajica, Agincourt, Neo-Catalan, Janowski: 1.c4 e6 2.Nf3 d5 3.g3 Nf6 4.b3 c5 5.Bg2 Nc6 6.0-0 d4
         2. English, Kurajica, Agincourt, Neo-Catalan, Tarrasch: 1.c4 e6 2.Nf3 d5 3.g3 Nf6 4.Bg2 c5 5.b3 Nc6 6.0-0 Be7
         3. English, Kurajica, Agincourt, Bogo-Catalan: 1.c4 e6 2.Nf3 d5 3.g3 Nf6 4.Bg2 Bd6
         4. English, Kurajica, Agincourt, Neo-Catalan Declined: 1.c4 e6 2.Nf3 d5 3.g3 Nf6 4.Bg2 Be7
            1. English, Kurajica, Agincourt, Neo-Catalan Declined, Keres: 1.c4 e6 2.Nf3 d5 3.g3 Nf6 4.Bg2 Be7 5.0-0 c5 6.cxd5 Nxd5 7.Nc3 Nc6
            2. English, Kurajica, Agincourt, Neo-Catalan Declined, Bogoljubow: 1.c4 e6 2.Nf3 d5 3.g3 Nf6 4.Bg2 Be7 5.0-0 0-0 6.b3 c6
10. A15 English, Anglo-Indian: 1.c4 Nf6
    1. English, Anglo-Indian, Orangutan: 1.c4 Nf6 2.b4
    2. English, Anglo-Indian, Achilles-Omega Gambit: 1.c4 Nf6 2.e4
    3. English, Anglo-Indian, Queen's Indian Setup: 1.c4 Nf6 2.Nf3 b6
    4. English, Anglo-Indian, Scandinavian Setup: 1.c4 Nf6 2.Nf3 d5
       1. English, Anglo-Indian, Scandinavian Setup, Exchange: 1.c4 Nf6 2.Nf3 d5 3.cxd5 Nxd5
    5. English, Anglo-Indian, Old Indian: 1.c4 Nf6 2.Nf3 d6
    6. English, Anglo-Indian, King's Indian Setup: 1.c4 Nf6 2.Nf3 g6
       1. English, Anglo-Indian, King's Indian Setup, Double Fianchetto: 1.c4 Nf6 2.Nf3 g6 3.g3 b6 4.Bg2 Bb7
       2. English, Anglo-Indian, King's Indian Setup, Slav Setup: 1.c4 Nf6 2.Nf3 g6 3.g3 c6
       3. English, Anglo-Indian, King's Indian Setup, Grünfeld Setup: 1.c4 Nf6 2.Nf3 g6 3.g3 d5
    7. A16 English, Anglo-Indian: 1.c4 Nf6 2.Nc3 (without: 2...c5/e5/e6/Nc6)
       1. English, Anglo-Indian, Anglo-Grünfeld Defense: 1.c4 Nf6 2.Nc3 d5
          1. English, Anglo-Indian, Anglo-Grünfeld Defense, Korchnoi: 1.c4 Nf6 2.Nc3 d5 3.cxd5 Nxd5 4.Nf3 g6 5.g3 Bg7 6.Bg2 e5
          2. English, Anglo-Indian, Anglo-Grünfeld Defense, Czech: 1.c4 Nf6 2.Nc3 d5 3.cxd5 Nxd5 4.g3 g6 5.Bg2 Nb6
       2. English, Anglo-Indian, Anti-Anti-Grünfeld: 1.c4 Nf6 2.Nc3 g6 3.Nf3 Bg7 4.e4
       3. A17 English, Anglo-Indian, Hedgehog: 1.c4 Nf6 2.Nc3 e6 (without: 3.e4)
       4. English, Anglo-Indian, Hedgehog, Nimzo-English: 1.c4 Nf6 2.Nc3 e6 3.Nf3 Bb4
       5. A18 English, Anglo-Indian, Hedgehog: 1.c4 Nf6 2.Nc3 e6 3.e4 (without: 3...c5)
       6. English, Anglo-Indian, Hedgehog, Nimzo-English: 1.c4 Nf6 2.Nc3 e6 3.e4 Bb4
       7. A19 English, Anglo-Indian, Hedgehog, Sicilian Set-up: 1.c4 Nf6 2.Nc3 e6 3.e4 c5
          1. English, Anglo-Indian, Hedgehog, Sicilian Set-up, Nei Gambit: 1.c4 Nf6 2.Nc3 e6 3.e4 c5 4.e5 Ng8
          2. English, Anglo-Indian, Hedgehog, Sicilian Set-up, Mazel: 1.c4 Nf6 2.Nc3 e6 3.e4 c5 4.f4
11. A20 English, King-English: 1.c4 e5
    1. English, King-English, Kahiko-Hula Gambit: 1.c4 e5 2.e3 Nf6 3.f4 exf4 4.Nf3
    2. English, King-English, Drill: 1.c4 e5 2.g3 h5
    3. English, King-English, Nimzowitsch: 1.c4 e5 2.Nf3
       1. English, King-English, Nimzowitsch-Flohr: 1.c4 e5 2.Nf3 e4
    4. A21 English, King-English: 1.c4 e5 2.Nc3 (without: 2...Nc6/Nf6)
    5. English, King-English, Kramnik-Shirov Counterattack: 1.c4 e5 2.Nc3 Bb4
    6. English, King-English, Keres: 1.c4 e5 2.Nc3 d6 3.g3 c6
    7. English, King-English, Smyslov: 1.c4 e5 2.Nc3 d6 3.Nf3 Bg4
    8. English, King-English, Troger: 1.c4 e5 2.Nc3 Nc6 3.g3 d6 4.Bg2 Be6
    9. A22 English, King-English 2-Knight: 1.c4 e5 2.Nc3 Nf6
       1. English, King-English 2-Knight, Mazedonisch: 1.c4 e5 2.Nc3 Nf6 3.f4
       2. English, King-English 2-Knight, Anderssen: 1.c4 e5 2.Nc3 Nf6 3.a3
       3. English, King-English 2-Knight, Carls-Bremen: 1.c4 e5 2.Nc3 Nf6 3.g3
          1. English, King-English 2-Knight, Carls-Bremen Smyslov: 1.c4 e5 2.Nc3 Nf6 3.g3 Bb4
          2. English, King-English 2-Knight, Carls-Bremen, Reversed Dragon: 1.c4 e5 2.Nc3 Nf6 3.g3 d5
          3. A23 English, King-English 2-Knight, Bremen, Keres: 1.c4 e5 2.Nc3 Nf6 3.g3 c6
             1. English, King-English 2-Knight, Bremen, Kere, Bogoljubow: 1.c4 e5 2.Nc3 Nf6 3.g3 c6 4.d5 ed4 5.Qd4 d5
          4. A24 English Opening, King-English 2-Knight, Bremen, Double Fianchetto Variation: 1.c4 e5 2.Nc3 Nf6 3.g3 g6
       4. English, King-English 2-Knight, Bellón Gambit: 1.c4 e5 2.Nc3 Nf6 3.Nf3 e4 4.Ng5 b5
       5. English, King-English 2-Knight, Adhiban Gambit: 1.c4 e5 2.Nc3 Nf6 3.Nf3 e4 4.Ng5 c6
       6. English, King-English 2-Knight, Erbenheimer Gambit: 1.c4 e5 2.Nc3 Nf6 3.Nf3 e4 4.Ng5 Ng4
    10. A25 English, King-English, Closed: 1.c4 e5 2.Nc3 Nc6 (without 3.e3 Nf6 4.Nf3)
        1. English, King-English, Closed, Taimanov: 1.c4 e5 2.Nc3 Nc6 3.g3 g6 4.Bg2 Bg7 5.e3 d6 6.Nge2
           1. English, King-English, Closed, Bremen-Hort: 1.c4 e5 2.Nc3 Nc6 3.g3 g6 4.Bg2 Bg7 5.e3 d6 6.Nge2 Be6
           2. English, King-English, Closed, Taimanov Main Line: 1.c4 e5 2.Nc3 Nc6 3.g3 g6 4.Bg2 Bg7 5.e3 d6 6.Nge2 Nh6
        2. English, King-English, Closed, Hungarian Attack: 1.c4 e5 2.Nc3 Nc6 3.g3 g6 4.Bg2 Bg7 5.Rb1
        3. A26 English, King-English, Closed, Symmetrical: 1.c4 e5 2.Nc3 Nc6 3.g3 g6 4.Bg2 Bg7 5.d3 d6
           1. English, King-English, Closed, Symmetrical,Botvinnik: 1.c4 e5 2.Nc3 Nc6 3.g3 g6 4.Bg2 Bg7 5.d3 d6 6.e4
           2. English, King-English, Closed, Symmetrical, Full Symmetrical: 1.c4 e5 2.Nc3 Nc6 3.g3 g6 4.Bg2 Bg7 5.d3 d6 6.Nf3 Nf6
    11. A27 English, King-English, 3-Knight: 1.c4 e5 2.Nc3 Nc6 3.Nf3 (without: 3...Nf6)
        1. Stoltz: 1.c4 e5 2.Nc3 Nc6 3.Nf3 Nge7
        2. A28 English, King-English, 4-Knight: 1.c4 e5 2.Nc3 Nc6 3.Nf3 Nf6 (without 4.g3)
           1. English, King-English, Four Knights, Korchnoi: 1.c4 e5 2.Nc3 Nc6 3.Nf3 Nf6 4.a3
           2. English, King-English, Four Knights, Flexible: 1.c4 e5 2.Nc3 Nc6 3.Nf3 Nf6 4.d3
           3. English, King-English, Four Knights, Revshevsky: 1.c4 e5 2.Nc3 Nc6 3.Nf3 Nf6 4.Bb4
           4. English, King-English, Four Knights, Bradley Beach: 1.c4 e5 2.Nc3 Nc6 3.Nf3 Nf6 4.d4 e4
           5. English, King-English, Four Knights, Keres: 1.c4 e5 2.Nc3 Nc6 3.Nf3 Nf6 4.d4 ed4 5.Nd4 Bc5 Quiet: 1.c4 e5 2.Nc3 Nc6 3.Nf3 Nc6 4.e3
           6. English, King-English, Four Knights, Nimzowitsch: 1.c4 e5 2.Nc3 Nc6 3.Nf3 Nf6 4.e4
           7. A29 English Opening, King-English, Four Knights, Kingside Fianchetto: 1.c4 e5 2.Nc3 Nc6 3.Nf3 Nf6 4.g3
           8. English Opening, King-English, Four Knights, Kingside Fianchetto, Pin: 1.c4 e5 2.Nc3 Nc6 3.Nf3 Nf6 4.g3 Bb4
           9. English Opening, King-English, Four Knights, Kingside Fianchetto, Exchange: 1.c4 e5 2.Nc3 Nc6 3.Nf3 Nf6 4.g3 d5 5.cxd5 Nd5
12. A30 English Opening, Symmetrical: 1.c4 c5
    1. English Opening, Symmetrical, Wing Gambit: 1.c4 c5 2.b4
    2. English Opening, Symmetrical, Chigorin: 1.c4 c5 2.f4
    3. English Opening, Symmetrical 2-Knight Transposed: 1.c4 c5 2.Nf3 Nf6
       1. English Opening, Symmetrical 2-Knight Transposed, Napolitano Gambit: 1.c4 c5 2.Nf3 Nf6 3.b4
       2. English Opening, Symmetrical 2-Knight Transposed, Richter: 1.c4 c5 2.Nf3 Nf6 3.b3 Nc6 4.Bb2 d6
       3. English Opening, Symmetrical 2-Knight Transposed, Double Fianchetto: 1.c4 c5 2.Nf3 Nf6 3.g3 b6 4.Bg2 Bb7 5.0-0 g6
          1. English Opening, Symmetrical 2-Knight Transposed, Triple Fianchetto: 1.c4 c5 2.Nf3 Nf6 3.g3 b6 4.Bg2 Bb7 5.0-0 g6 6.b3 Bg7 7.Bb2
       4. English Opening, Symmetrical 2-Knight Transposed, Hedgehog: 1.c4 c5 2.Nf3 Nf6 3.g3 b6 4.Bg2 Bb7 5.0-0 e6 6.Nc3 Be7
       5. A31 English Opening, Symmetrical 2-Knight Transposed, Anti-Benoni Setup: 1.c4 c5 2.Nf3 Nf6 3.d4 cxd4 4.Nxd4
          1. English Opening, Symmetrical 2-Knight Transposed, Anti-Benoni Setup, Donner: 1.c4 c5 2.Nf3 Nf6 3.d4 cxd4 4.Nxd4 Nc6 5.g3 Qa5
          2. English Opening, Symmetrical 2-Knight Transposed, Anti-Benoni Setup, Keres: 1.c4 c5 2.Nf3 Nf6 3.d4 cxd4 4.Nd4 b6 5.f3
          3. English Opening, Symmetrical 2-Knight Transposed, Anti-Benoni Setup, Ljubojević: 1.c4 c5 2.Nf3 Nf6 3.d4 cxd4 4.Nxd4 b6 5.Nc3 Bb7 6.Bg5 a6
          4. English Opening, Symmetrical 2-Knight Transposed, Anti-Benoni Setup, Mieses: 1.c4 c5 2.Nf3 Nf6 3.d4 cxd4 4.Nd4 b6 5.Nc3 Bb7 6.f3 g6
          5. English Opening, Symmetrical 2-Knight Transposed, Anti-Benoni Setup, Furman: 1.c4 c5 2.Nf3 Nf6 3.d4 cxd4 4.Nxd4 e5 5.Nf3 e4 6.Nd4 d5
          6. A32 English Opening, Symmetrical 2-Knight Transposed, Anti-Benoni Setup, Speelman: 1.c4 c5 2.Nf3 Nf6 3.d4 cxd4 4.Nxd4 e6
             1. English Opening, Symmetrical 2-Knight Transposed, Anti-Benoni Setup, Speelman, Alekhine: 1.c4 c5 2.Nf3 Nf6 3.d4 cxd4 4.Nxd4 e6 5.a3
             2. English Opening, Symmetrical 2-Knight Transposed, Anti-Benoni Setup, Speelman, Filip: 1.c4 c5 2.Nf3 Nf6 3.d4 cxd4 4.Nxd4 e6 5.e3
             3. English Opening, Symmetrical 2-Knight Transposed, Anti-Benoni Setup, Speelman, Fianchetto: 1.c4 c5 2.Nf3 Nf6 3.d4 cxd4 4.Nxd4 e6 5.g3
                1. English Opening, Symmetrical 2-Knight Transposed, Anti-Benoni Setup, Speelman, Fianchetto, Anand: 1.c4 c5 2.Nf3 Nf6 3.d4 cxd4 4.Nxd4 e6 5.g3 a6
                2. English Opening, Symmetrical 2-Knight Transposed, Anti-Benoni Setup, Speelman, Fianchetto, Lasker: 1.c4 c5 2.Nf3 Nf6 3.d4 cxd4 4.Nxd4 e6 5.g3 Bb4
                3. English Opening, Symmetrical 2-Knight Transposed, Anti-Benoni Setup, Speelman, Fianchetto, Hort: 1.c4 c5 2.Nf3 Nf6 3.d4 cxd4 4.Nxd4 e6 5.g3 Qb6
                4. English Opening, Symmetrical 2-Knight Transposed, Anti-Benoni Setup, Speelman, Fianchetto, Mikėnas: 1.c4 c5 2.Nf3 Nf6 3.d4 cxd4 4.Nxd4 e6 5.g3 Qc7
             4. A33 English Opening, Symmetrical 2-Knight Transposed, Anti-Benoni Setup, Speelman: 1.c4 c5 2.Nf3 Nf6 3.d4 cxd4 4.Nxd4 e6 5.Nc3 Nc6
                1. English Opening, Symmetrical 2-Knight Transposed, Anti-Benoni Setup, Speelman Main Line: 1.c4 c5 2.Nf3 Nf6 3.d4 cxd4 4.Nxd4 e6 5.Nc3 Nc6 6.a3
                2. English Opening, Symmetrical 2-Knight Transposed, Anti-Benoni Setup, Speelman, Alekhine: 1.c4 c5 2.Nf3 Nf6 3.d4 cxd4 4.Nxd4 e6 5.Nc3 Nc6 6.e3
                3. English Opening, Symmetrical 2-Knight Transposed, Anti-Benoni Setup, Speelman, Tarasov: 1.c4 c5 2.Nf3 Nf6 3.d4 cxd4 4.Nxd4 e6 5.Nc3 Nc6 6.Nc6
                4. English Opening, Symmetrical 2-Knight Transposed, Anti-Benoni Setup, Speelman, Kupchik: 1.c4 c5 2.Nf3 Nf6 3.d4 cxd4 4.Nxd4 e6 5.Nc3 Nc6 6.Bf4
    4. A34 English Opening, Symmetrical: 1.c4 c5 2.Nc3
       1. English Opening, Symmetrical, 3-Knight: 1.c4 c5 2.Nc3 Nf6 3.Nf3
          1. English Opening, Symmetrical, 4-Knight: 1.c4 c5 2.Nc3 Nf6 3.Nf3 Nc6
          2. English Opening, Symmetrical, Asymmetrical, 3-Knight: 1.c4 c5 2.Nc3 Nf6 3.Nf3 d5 4.cxd5 Nxd5
             1. English Opening, Symmetrical, Asymmetrical, 3-Knight, Uhlmann: 1.c4 c5 2.Nc3 Nf6 3.Nf3 d5 4.cxd5 Nxd5 5.Qa4
       2. English Opening, Symmetrical, Fianchetto: 1.c4 c5 2.Nc3 Nf6 3.g3
          1. English Opening, Symmetrical, Fianchetto, Rubinstein: 1.c4 c5 2.Nc3 Nf6 3.g3, d5 4.cxd5 Nxd5 5.Bg2 Nc7
       3. A35 English, Symmetrical 2-Knight: 1.c4 c5 2.Nc3 Nc6
          1. English, Symmetrical 2-Knight, Staunton: 1.c4 c5 2.Nc3 Nc6 3.e3
             1. English Opening, Symmetrical 2-Knight, Staunton-De Saint Amant: 1.c4 c5 2.Nc3 Nc6 3.e3 e5
          2. English, Symmetrical 3-Knight: 1.c4 c5 2.Nc3 Nc6 3.Nf3
             1. English Opening, Symmetrical 4-Knight: 1.c4 c5 2.Nc3 Nc6 3.Nf3 Nf6
          3. A36 English Opening, Symmetrical 2-Knight, Fianchetto: 1.c4 c5 2.Nc3 Nc6 3.g3
             1. English Opening, Symmetrical 2-Knight, Fianchetto, Ultra Symmetrical: 1.c4 c5 2.Nc3 Nc6 3.g3 g6 4.Bg2 Bg7
                1. English Opening, Symmetrical 2-Knight, Fianchetto, Ultra Symmetrical, Smyslov: 1.c4 c5 2.Nc3 Nc6 3.g3 g6 4.Bg2 Bg7 5.b3
                2. English Opening, Symmetrical 2-Knight, Fianchetto, Ultra Symmetrical, Botvinnik Reversed: 1.c4 c5 2.Nc3 Nc6 3.g3 g6 4.Bg2 Bg7 5.e3 e5
                3. English Opening, Symmetrical 2-Knight, Fianchetto, Ultra Symmetrical, Suetin: 1.c4 c5 2.Nc3 Nc6 3.g3 g6 4.Bg2 Bg7 5.e3 Nh6
                4. English Opening, Symmetrical 2-Knight, Fianchetto, Ultra Symmetrical, Botvinnik: 1.c4 c5 2.Nc3 Nc6 3.g3 g6 4.Bg2 Bg7 5.e4
                5. English Opening, Symmetrical 2-Knight, Fianchetto, Ultra Symmetrical, Taimanov: 1.c4 c5 2.Nc3 Nc6 3.g3 g6 4.Bg2 Bg7 5.Nh3
                6. A37 English Opening, Symmetrical 2-Knight, Fianchetto, Ultra Symmetrical: 1.c4 c5 2.Nc3 Nc6 3.g3 g6 4.Bg2 Bg7 5.Nf3
                   1. English Opening, Symmetrical 2-Knight, Fianchetto, Ultra Symmetrical, Barcza: 1.c4 c5 2.Nc3 Nc6 3.g3 g6 4.Bg2 Bg7 5.Nf3 a6
                   2. English Opening, Symmetrical 2-Knight, Fianchetto, Ultra Symmetrical Maroczy: 1.c4 c5 2.Nc3 Nc6 3.g3 g6 4.Bg2 Bg7 5.Nf3 d6
                   3. English Opening, Symmetrical 2-Knight, Fianchetto, Ultra Symmetrical Korchnoi: 1.c4 c5 2.Nc3 Nc6 3.g3 g6 4.Bg2 Bg7 5.Nf3 Nh6
                   4. A38 English Opening, Symmetrical 2-Knight, Fianchetto, Ultra Symmetrical: 1.c4 c5 2.Nc3 Nc6 3.g3 g6 4.Bg2 Bg7 5.Nf3 Nf6
                      1. English Opening, Symmetrical 2-Knight, Fianchetto, Ultra Symmetrical, Reti: 1.c4 c5 2.Nc3 Nc6 3.g3 g6 4.Bg2 Bg7 5.Nf3 Nf6 6.d3
                      2. English Opening, Symmetrical 2-Knight, Fianchetto, Ultra Symmetrical, Double White Fianchetto: 1.c4 c5 2.Nc3 Nc6 3.g3 g6 4.Bg2 Bg7 5.Nf3 Nf6 6.0-0 0-0 7.b3
                      3. English Opening, Symmetrical 2-Knight, Fianchetto, Ultra Symmetrical, Duchamp: 1.c4 c5 2.Nc3 Nc6 3.g3 g6 4.Bg2 Bg7 5.Nf3 Nf6 6.0-0 0-0 7.d3
                      4. A39 English Opening, Symmetrical 2-Knight, Fianchetto, Ultra Symmetrical, Mecking: 1.c4 Nf6 2.Nf3 c5 3.Nc3 Nc6 4.g3 g6 5.Bg2 Bg7 6.0-0 0-0 7.d4
                         1. English Opening, Symmetrical 2-Knight, Fianchetto, Ultra Symmetrical, Mecking, Fischer: 1.c4 Nf6 2.Nf3 c5 3.Nc3 Nc6 4.g3 g6 5.Bg2 Bg7 6.0-0 0-0 7.d4 cxd4 8.Nxd4 Ng4 9.e3 d6

• A40 Queen's Pawn Game 1.d4

   → Hartlaub Gambit Accepted:          → 5.exf5 Nf6 

• A40 Polish: 1...b5

   → Hartlaub Gambit:                   → 2.c4 Bb7 3.Nc3 e6 4.e4 f5     → Spassky Gambit Accepted:           → 2.e4 Bb7 3.Bxb5 

• A40 Owen: 1...b6

• A40 Horwitz: 1...c6

   → Kudischewitsch Gambit:             → 2.Nf3 Nf6 3.c4 b5 

• A40 Englund Gambit: 1...e5

   → Declined: Reversed French:         → 2.e3    → Englund Gambit Declined:           → 2.d5    → → Diemer Counterattack:            → 2...Bc5 3.e4 Qh4    → Reversed Alekhine:                 → 2.Nf3    → → Reversed Krebs:                  → 2...e4    → → → Reversed Mokele Mbembe:        → → → 3.Ne5    → → → Reversed Brooklyn:             → → → 3.Ng1     → Englund Gambit Accepted:           → 2.dxe5    → → Hartlaub-Charlick Gambit:        → → 2...d6    → → Soller Gambit:                   → → 2...f6    → → Felbecker Gambit:                → → 2...Nc6 3.Nf3 Bc5    → → Soller Gambit Deferred:          → → 2...Nc6 3.Nf3 f6    → → Zilbermints Gambit:              → → 2...Nc6 3.Nf3 Nge7    → → Main Line:                       → → 2...Nc6 3.Nf3 Qe7    → → → Stockholm Variation:           → → → 4.Qd5    → → Mosquito Gambit:                 → → 2...Qh4 

• A40 Horwitz: 1.d4 e6

   Keres:                               2.c4 b6    → Poli Gambit:                       → 3.e4 Bb7 4.f3 f5    → → Accepted Poli Gambit:            → → 5.exf5    → Perrin Variation:                  → 3.e4 Bb7 4.Bd3 Nc6    Zilbermints Gambit:                  2.c4 e5    Kangaroo:                            2.c4 Bb4+ 

• A40 Borg Gambit: 1.d4 g5

• A40 Modern Defense: 1.d4 g6

   Kotov/Robatsch:            2.c4 Bg7    → Benoni Pterodactyl:      → 3.e4 c5 4.d5 Qa5+    → Neo-Modern:              → 3.e4 e5    → Beefeater:               → 3.Nc3 c5 4.d5 Bxc3+ 5.bxc3 f5    Lizard:                    2.h4 Nf6    → Pirc-Diemer Gambit:      → 3.h5    Siroccopteryx:             2.Nf3 Bg7 3.e3 c5 4.Bd3 cxd4 5.Nxd4 Qa5+    Pterodactyl:               2.Nf3 Bg7 3.e3 c5 4.Bd3 Qa5+ 

• A40 Australian Defense: 1.d4 Na6

• A40 Mikenas Defense: 1.d4 Nc6

   Lithuanian:                2.c4 e5 3.d5 Nce7    Cannstatter:               2.c4 e5 3.d5 Nd4    Pozarek Gambit:            2.c4 e5 3.dxe5 Nxe5 4.Nc3 Nxc4    Montevideo:                2.d5 Nb8    → → Zaire Defense:         → 3.e4 Nf6 4.e5 Ng8 

• A41 Pillsbury: 1.d4 d6

   Old Indian:                  → 2.c4    → Rat Defense: English Rat:  →  → 2...e5    → → Pounds Gambit:           → → → 3.dxe5 Be6    → → Lisbon Gambit:           → → → 3.dxe5 Nc6    Wade or Tartakower:          2.Nf3 Bg4    → Chigorin:                  → 3.c4 Nd7 4.Qb3 Rb8    Robatsch:                    2.Nf3 g6 3.c4 Bg7 4.e4 Bg4    Neo-Modern:                  2.c4 Bg7 3.e4 e5    Exchange:                    2.g3 e5 3.de5 de5 4.Qd8 Kd8 

• A42 Averbakh or Wade: 1.d4 d6 2.c4 g6 3.Nc3 Bg7 4.e4

   Randspringer:               4...f5    Botvinnik:                  4...c5    Kotov:                      4...Nc6    Pterodactyl:                4...Qa5+ 5.Nc3 d6 

• A43 Benoni: 1.d4 c5

   Zilbermints-Benoni Gambit:         2.b4    Liedmann Gambit:                   2.c4 cxd4 3.e3    Old Benoni:                        2.d5 d6    → Schmid:                          → 3.Nc3 g6    → Spielmann:                       → 3.Nf3 Nf6 4.Nc3 Bf5    → Tarrasch:                        → 3.Nf3 Nf6 4.Nc3 e6    Mujannah or Clarendon:             2.d5 f5    → Benoni-Staunton Gambit:          → 3.e4    Franco-Benoni:                     2.d5 e6    Von Bardeleben:                    2.d5 g6 3.e4    Snail:                             2.d5 Na6    Benoni-Indian:                     2.d5 Nf6    → Woozle:                          → 3.Nc3 Qa5    → Pseudo-Benko Gambit:             → 3.Nf3 b5    Benoni Gambit Accepted:            2.dxc5    → Cormorant Gambit:                → 2...b6    → Schlenker:                       → 2...Na6    Delayed Zilbermints-Benoni Gambit: 2.Nf3 cxd4 3.b4    → Tamarkin Countergambit:          3...e5    Speelsmet Gambit: 2.Nf3 cxd4 3.e3 

• A44 Benoni, Alekhine: 1.d4 c5 2.d5 e5

   Semi-Benoni:            3.e4 d6 

===A45–A49=== 1.d4 Nf6 Atypical replies to 1...Nf6

• A45 Queen's Pawn Game, Indian Defense: 1.d4 Nf6

   Trompowsky:                                 2.Bg5    → McShane:                                  → 2...c5 3.d5 d6    → Poisoned Pawn:                            → 2...c5 3.d5 Qb6 4.Nc3    → → Chepukatis Gambit:                      → → 4...Qb2 5.Bd2 Qb6    → Classical:                                → 2...e6    → → Big Center:                             → → 3.e4    → Just:                                     → 2...g6 e3    → Borg:                                     → 2...Ne4 3.Bf4 g5    → Edge:                                     → 2...Ne4 3.Bh4    → → Hergert Gambit 1:                       → → 3...c6 4.Nd2 Qa5 5.c3 Nxd2 6.Qxd2 d5 7.e4    → → Hergert Gambit 2:                       → → 3...d5 4.f3 Nf6 5.Nc3 Bf5 6.e4    → Raptor:                                   → 3.h4    → → Hergert/Raptor Gambit:                  → → 3...Nxg5 4.hxg5 e5    Pawn Push:                                  2.d5    Omega Gambit:                               2.e4    → Accepted Omega Gambit:                    → 2...Nxe4    → → Arafat Gambit:                          → → 3.Bd3 Nf6 4.Bg5    Paleface Attack:                            2.f3    → Blackmar-Diemer Gambit Deferred:          → 2...d5 3.e4    → → Kraus-Muhlherr Gambit:                  → → 3...e5 4.de5 Ne4    → Gedult:                                   → 2...d5 3.g4    → Richter:                                  → 2...d5 3.Nc3    → Linder Countergambit:                     → 2...e6 3.e4 Ne4    Canard:                                     2.f4    Tartakower:                                 2.g3    → Ueberlinger Gambit:                       → 2...e5    Gibbins-Weidenhagen Gambit:                 2.g4    → Oshima:                                   → 2...e5     → Gibbins-Weidenhagen Gambit Accepted:      → 2.g4 Nxg4    → → Stummer Gambit:                         → → 3.e4 d6 4.Be2 Nf6 5.Nc3    → → Maltese-Falcon Gambit:                  → → 3.f3 Nf6 4.e4    Reversed Chigorin:                          2.Nc3 c5    Maddigan Gambit:                            2.Nc3 e5    Lazard Gambit:                              2.Nd2 e5 

• A46 Queen's Pawn game, Knight Game: 1.d4 Nf6 2.Nf3

   Alburt-Miles:                         2...a6    Polish Setup:                         2...b5    Spielmann-Indian:                     2...c5    Czech-Indian:                         2...c6    Old Indian:                           2...d6    → Bogoljubow:                         → 3.e3 Nbd7    → Chajes:                             → 3.Bf4 Nbd7    Yusupov-Rubinstein:                   2...e6 3.e3    Romanishin:                           2...e6 3.g3 b5 4.Bg2 d5    Taimanov:                             2...e6 3.g3 b5 4.Qd3 a6    Veresov:                              2...e6 3.Nc3 d5 4.Bg5    London:                               2...e6 3.Bf4    → Rotlewi                             → 3...c5 4.e3 Qb6 5.Qc1 Nc6 6.c3 d5    → Bogoljubow                          → 3...c5 4.e3 Qb6 5.Qc1 Nc6 6.c3 Nh6    Delayed Torre:                        2...e6 3.Bg5    → Petrosian Gambit:                   → 3...c5 4.e3 b6 5.d5    → Wagner Gambit:                      → 3...c5 4.e4    → Breyer:                             → 3...d5 4.e3 c5 5.c3 Qb6    → Nimzowitsch:                        → 3...h6    → → Petrosian:                        → → 4.Bh4 g5 5.Bg3    Doery:                                2...Ne4 

• A47 Queen's Indian: 1.d4 Nf6 2.Nf3 b6

   Schnepper Gambit:       3.c3 e5    Gunsberg:               3.e3 Bb7 4.b3 e6 5.Bb2 d5    → Amos Burn:            → 6.Nbd2    Marienbad:              3.g3 Bb7 4.Bg2 c5    → Berg:                 → 5.c4 cxd4 6.Qxd4    Bronstein:              3.Bf4 Bb7 4.e3 e6 5.h3 

• A48 King's Indian: 1.d4 Nf6 2.Nf3 g6

   London:              3.Bf4    Torre:               3.Bg5    → Tartakower:        → 3...Bg7 4.Nc3    → Grünfeld:          → 3...Bg7 4.Nbd2 d5 5.e3 0-0    Colle:               3.e3 Bg7 4.Bd3 d6    Barry:               3.Nc3 d5 4.Bf4    → Grünfeld:          → 4...Bg7 5.e3 0-0 6.Be2    → Tarzan:            → 4...Bg7 5.Qd2 

• A49 King's Indian, Przepiorka: 1.d4 Nf6 2.Nf3 g6 3.g3

   Nimzowitsch:                     3...Bg7 4.b3 d6 5.Bb2 

===A50–A55=== 1.d4 Nf6 2.c4 without 2...e6 or 2...g6: Atypical Indian systems

• A50 Queen's Pawn Game: 1.d4 Nf6 2.c4

   Pyrenees Gambit:                2...b5    Saemisch-Indian:                2...b6    → Teichmann:                    → 3.Nc3 Bg7 4.Qc2    Slav-Indian:                    2...c6    Devin Gambit:                   2...e6 3.g4    Medusa Gambit:                  2...g5    Mexican/Iago/Kevitz/Trajkovic:  2...Nc6    → Horsefly Gambit:              → 3.d5 Ne5 4.f4 

• A51 Budapest Gambit Declined: 1.d4 Nf6 2.c4 e5

   Fajarowicz:                         3.dxe5 Ne4    → Fajarowicz, Bonsdorf:             → 4.a3 b6    → Fajarowicz, Steiner:              → 4.Qc2 

• A52 Budapest Gambit Accepted: 1.d4 Nf6 2.c4 e5 3.dxe5 Ng4

   Alekhine:                       4.e4    → Alekhine, Tartakower:         → 4...d6    → Alekhine, Reti:               → 4...h5    → Alekhinen, Wikstrom Gambit:   → 4...Nxe5 5.f4 Nbc6    → Alekhinen, Abonyi:            → 4...Nxe5 5.f4 Nec6    Adler:                          4.Nf3    Rubinstein:                     4.Bf4 

• A53 Old Indian Defence: 1.d4 Nf6 2.c4 d6

   Aged Gibbon Gambit:                 3.g4    Ukrainian:                          3.Nc3 e6    Janowski:                           3.Nc3 Bf5    → Janowski, Grinberg Gambit:        → 4.e4    → Janowski, Main Line:              → 4.f3    → Janowski, Fianchetto:             → 4.g3    → → Janowski, Fianchetto, Janowski: → 4...c6    → → Janowski, Fianchetto, Tal:      → 4...e5    Czech Variation, with Nc3:          3.Nc3 c6    Czech Variation, with Nf3:          3.Nf3 c6    Tartakower-Indian:                  3.Nf3 Bg4 

• A54 Old Indian, Ukrainian: 1.d4 Nf6 2.c4 d6 3.Nc3 e5

   Duz-Khotimirsky:             4.e3 Nbd7 5.Bd3    2-Knight:                    4.Nf3    → Tolush:                    → 4...Nbd7 5.Bg5 c6    → Chigorin:                  → 4...Nbd7 5.Bg5 h6 

• A55 Old Indian, Ukrainian, Main: 4.Nf3 Nbd7 5.e4

=== A56–A79 === Benoni Defence: 1.d4 Nf6 2.c4 c5

• A56 Benoni Defence: 1.d4 Nf6 2.c4 c5

   Hromádka:                                       3.d5 d6    → Lundin                                        → 4.Nc3 g6 5.e4 b5    Czech Benoni:                                   3.d5 e5    → King's Indian Setup:                          → 4.Nc3 d6 5.e4 g6    Vulture:                                        3.d5 Ne4    Exchange:                                       3.dxc5    → Weenink:                                      → 3...e6    → → Gibbon                                      → → 4.g4 

• A57 Benoni, Benko Gambit: 1.d4 Nf6 2.c4 c5 3.d5 b5

   Half Accepted:                     4.cxb5     → Pawn Return:                     → 4...a6 5.b6    → Modern:                          → 4...a6 5.e3    → Dlugy:                           → 4...a6 5.f3    → Zaitsev:                         → 4...a6 5.Nc3    → → Nescafe Frappe:                → → 5...axb5 6.e4 b4 7.Nb5    Declined, Sosonko:                 4.a4    → Kasparov                         4...b4 5.Nd2 g6 6.e4 d6    Declined, Larsen Setup:            4.b3    Declined, Hjoerring Countergambit: 4.e4    Declined: Pseudo-Sämisch:          4.f3    Decline, Mutkin Countergambit:     4.g4    Declined, Quiet:                   4.Nd2    Declined, Main:                    4.Nf3    Declined Bishop:                   4.Bg5 

• A58 Benko Gambit, Fully Accepted: 1.d4 Nf6 2.c4 c5 3.d5 b5 4.cxb5 a6 5.bxa6

   Fianchetto:                             5...Bxa6 6.Nc3 d6 7.Nf3 g6 8.g3    Nd2 Variation:                          5...Bxa6 6.Nc3 d6 7.Nf3 g6 8.Nd2 

'A59 Benko Gambit, Fully Accepted Main: 1.d4 Nf6 2.c4 c5 3.d5 b5 4.cxb5 a6 5.bxa6 Bxa6

   Yugoslav:                                     6.Nc3 d6 7.e4    Center Storm:                                 6.Nc3 g6 7.f4 

• A60 Benoni, Modern: 1.d4 Nf6 2.c4 c5 3.d5 e6

   Kotov                 4.de6 fe6    Book:                 4.g3 b5    Tal:                  4.g3 ed5 5.cd5 b5    Snake:                4.Nc3 exd5 5.cxd5 Bd6    Fischer:              4.Nc3 exd5 5.Nxd5 Nxd5 6.Qxd5 Nc6 

• A61 Benoni, Modern: 1.d4 Nf6 2.c4 e6 3.Nf3 c5 4.Nc3 exd5 5.cxd5 d6 6.Nf3 g6

   Fianchetto:           7.g3    Nimzowitsch:          7.Nd2    → Marshall:           → 7...Nbd7    Uhlmann:              7.Bg5    Keres:                7.Bf4    → Ivkov:              → 7...a6    → Tal                 → 7...Bg7 

• A62 Benoni, Modern Double Fianchetto: 1.d4 Nf6 2.c4 e6 3.Nf3 c5 4.Nc3 exd5 5.cxd5 d6 6.Nf3 g67.g3 Bg7 8.Bg2 0-0

   Trifunovic:                             9.0-0 b6    Marshall:                               9.0-0 Nbd7    Taimanov:                               9.0-0 Bg4 

• A63 Benoni, Double Fianchetto: 1.d4 Nf6 2.c4 e6 3.Nf3 c5 4.Nc3 exd5 5.cxd5 d6 6.Nf3 g67.g3 Bg7 8.Bg2 0-0 9.0-0 a6 10.a4 Nbd7

• A64 Benoni, Double Fianchetto 1.d4 Nf6 2.c4 e6 3.Nf3 c5 4.Nc3 exd5 5.cxd5 d6 6.Nf3 g67.g3 Bg7 8.Bg2 0-0 9.0-0 a6 10.a4 Nbd7 11.Nd2 Re8

   Donner:                         12.h3     Karpov:                         12.Nc4    Vaganian:                       12.Rb1    Kortschnoj:                     12.Qb3 

• A65 Benoni: 1.d4 Nf6 2.c4 e6 3.Nf3 c5 4.Nc3 exd5 5.cxd5 d6 6.e4

• A66 Benoni, Pawn Storm: 1.d4 Nf6 2.c4 e6 3.Nf3 c5 4.Nc3 exd5 5.cxd5 d6 6.e4 g6 7.f4

   Mikenas:                  7...Bg7 8.e5 

• A67 Benoni, Pawn Storm Taimanov: 1.d4 Nf6 2.c4 e6 3.Nf3 c5 4.Nc3 exd5 5.cxd5 d6 6.e4 g6 7.f4 Bg7 8.Bb5+

   Tal:                                   8...Nbd7    Aronin:                                8...Nfd7    Nezmetdinov:                           8...Bd7 

• A68 Benoni, Pawn Storm: 1.d4 Nf6 2.c4 e6 3.Nf3 c5 4.Nc3 exd5 5.cxd5 d6 6.e4 g6 7.f4 Bg7 8.Nf3 0-0

   Colle:                    9.Be2 

• A69 Benoni, Pawn Storm, Main line: 1.d4 Nf6 2.c4 e6 3.Nf3 c5 4.Nc3 exd5 5.cxd5 d6 6.e4 g6 7.f4 Bg7 8.Nf3 0-0 9.Be2 Re8

• A70 Benoni, Classical 1.d4 Nf6 2.c4 e6 3.Nf3 c5 4.Nc3 exd5 5.cxd5 d6 6.e4 g6 7.Nf3

   Stahlberg:                  7...a6    New York:                   7...Bg7 8.h3    Bogoljubow:                 7...Bg7 8.Bd3 0-0    Taimanov:                   7...Bg7 8.Bd3 0-0 9.h3 a6    Aronin:                     7...Bg7 8.Bd3 0-0 9.h3 b5 

• A71 Benoni, Classical, Averbakh/Grivas: 1.d4 Nf6 2.c4 e6 3.Nf3 c5 4.Nc3 exd5 5.cxd5 d6 6.e4 g6 7.Nf3 Bg7 8.Bg5

  Tal:                                       8...a6   Zaitsev:                                   8...h6   Petrosian:                                 8...0-0 

• A72 Benoni, Classical, Carls 1.d4 Nf6 2.c4 c5 3.d5 e6 4.Nc3 exd5 5.cxd5 d6 6.e4 g6 7.Nf3 Bg7 8.Be2 0-0

• A73 Benoni, Classical, Carls, Ragozin: 1.d4 Nf6 2.c4 c5 3.d5 e6 4.Nc3 exd5 5.cxd5 d6 6.e4 g6 7.Nf3 Bg7 8.Be2 0-0 9.0-0

   Spassky                                  9...Bg4 

• A74 Benoni, Classical, Carls, Ragozin 1.d4 Nf6 2.c4 c5 3.d5 e6 4.Nc3 exd5 5.cxd5 d6 6.e4 g6 7.Nf3 Bg7 8.Be2 0-0 9.0-0 a6

• A75 Benoni, Classical, Carls, Ragozin, Argentine: 1.d4 Nf6 2.c4 e6 3.Nf3 c5 4.d5 exd5 5.cxd5 d6 6.Nc3 g6 7.e4 Bg7 8.Be2 0-0 9.0-0 a6 10.a4 Bg4

• A76 Benoni, Classical, Carls, Ragozin, Czerniak: 1.d4 Nf6 2.c4 c5 3.d5 e6 4.Nc3 exd5 5.cxd5 d6 6.e4 g6 7.Nf3 Bg7 8.Be2 0-0 9.0-0 Re8

   Cherepkov                                          11.Qc2 

• A77 Benoni, Classical, Carls, Ragozin, Czerniak, Tal: 1.d4 Nf6 2.c4 c5 3.d5 e6 4.Nc3 exd5 5.cxd5 d6 6.e4 g6 7.Nf3 Bg7 8.Be2 0-0 9.0-0 Re8 10.Nd2

• A78 Benoni, Classical, Carls, Ragozin, Czerniak, Tal: 1.d4 Nf6 2.c4 e6 3.Nf3 c5 4.d5 exd5 5.cxd5 d6 6.Nc3 g6 7.e4 Bg7 8.Be2 0-0 9.0-0 Re8 10.Nd2 Na6

   Lilienthal:                                             11.Re1    Szabo:                                                  11.Qc2 

• A79 Benoni, Classical, Carls, Ragozin, Czerniak, Tal: 1.d4 Nf6 2.c4 e6 3.Nf3 c5 4.d5 exd5 5.cxd5 d6 6.Nc3 g6 7.e4 Bg7 8.Be2 0-0 9.0-0 Re8 10.Nd2 Na6 11.f3

===A80–A99=== Dutch: 1.d4 f5

• A80 Dutch Defence: 1.d4 f5

   Tarrasch:                           2.c3    Krejcik Gambit:                     2.g4    → Hevendehl Gambit:                 → 2...e5    → Tate Gambit 1:                    → 2...fxg4 3.e4 d5 4.Nc3    → Tate Gambit 2:                    → 2...fxg4 3.e4 d6 4.Nc3    Korchnoi:                           2.h3    → Janzen-Korchnoi Gambit:           → 2...Nf6 3.g4    Raphael:                            2.Nc3    → Veresov:                          → 2...d5    → → Kingfisher Gambit:              → → 3.e4    → Spielmann Gambit:                 → 2...Nf6 3.g4    Omega-Isis Gambit:                  2.Nf3 e5    Morozevich:                         2.Bf4    → Senechaud Gambit:                 → 2...e6 3.g4    → Morozevich Flankplay:             → 2...Nf6 e3 g6 4.h4    Hopton:                             2.Bg5    Alapin:                             2.Qd3    → Anti-Stonewall:                   → 2...d5 3.g4    → Anti-Modern:                      → 2...d6 3.g4    → Von Pretzel Gambit:               → 2...e6 3.g4    → Anti-Leningrad:                   → 2...g6 3.g4    → Manhattan Gambit:                   → 2...Nf6 3.g4 

• A81 Dutch, Fianchetto: 1.d4 f5 2.g3

   Semi-Stonewall                2...e6 3.Nf3 d5 4.Bg2    Queen-Indian Setup:           2...e6 3.Nf3 b6    Accelerated Leningrad:        2...g6 3.Bg2 Bg7    → Basman                      4.Nf3 d6 5.0-0 Nh6    → Carlsbad Variation:         → 4.Nh3    Antoshin/Hort:                2...Nf6 3.Bg2 d6    Deferred Stonewall:           2...Nf6 3.Bg2 e6 4.Nf3 d5    Blackburne:                   2...Nf6 3.Bg2 e6 4.Nh3    Spielmann:                    2...Nf6 3.Bg2 e6 4.Bg5    Semi-Leningrad:               2...Nf6 3.Bg2 g6 

• A82 Dutch, Staunton Gambit 1.d4 f5 2.e4

   Balogh:                          2...d6    Accepted:                        2...fxe4    → Blackmar Double Gambit:        → 3.Nc3 Nf6 4.f3    → Tartakower:                    → 3.Nc3 Nf6 4.g4    → American Attack:               → 3.Nd2    → Marshall:                      → 3.Nc3 g6 Ne4 d5 5.Ng3    → Reti:                          → 3.Nc3 g6 Ne4 d5 5.Ng5 

• A83 Dutch, Staunton Gambit, Accepted: 1.d4 f5 2.e4 fxe4 3.Nc3 Nf6 4.Bg5

   Nimzowitsch:                           4...b6    Chigorin:                              4...c6    Paulsen:                               4...e6    Lasker:                                4...g6 5.f3    Alekhine:                              4...g6 5.h4 

• A84 Dutch: 1.d4 f5 2.c4

   Classical:              2...e6    → Kieseritzky:         → 3.a3    → Pillsbury:            → 3.e3 Nf6 4.Bd3    → Bellon Gambit:        → 3.e4    → Petrosian:            → 3.g4    → Rubinstein:           → 3.Nc3    → Nimzo-Dutch 1:        → → 3...Bb4    → Rubinstein-Stonewall: → → 3...d5    → Portisch Gamit        → 3.Nf3 d5 4.e3 c6 5.g4    → Janowski:             → 3.Nf3 d5 4.e3 c6 5.Nd2    Bladel:                 2...g6 3.Nc3 Nh6    Main:                   2...Nf6 

• A85 Dutch, Queen's Knight: 1.d4 f5 2.c4 Nf6 3.Nc3

   Antoshin:                    3...d6 4.Nf3 c6    Krause/4-Knight:             3...d6 4.Nf3 Nc6    Nimzo-Dutch 2:               3...e6 4.Bb4    Deferred Stonewall:          3...e6 4.g3 d5    Accelerated Stonewall:       3...e6 4.Nf3 d5    Accelerated Leningrad:       3...g6    → Bartel:                    → 4.h4 d6 

• A86 Dutch, King-Fianchetto: 1.d4 f5 2.c4 Nf6 3.g3

   Hort-Antoshin:                3...d6 4.Bg2 c6 5.Nc3 Qc7    Leningrad Variation:          3...g6 

• A87 Dutch, King-Fianchetto, Leningrad, Main: 1.d4 f5 2.c4 Nf6 3.g3 g6 4.Bg2 Bg7 5.Nf3

   Fluid:                                         5...0-0 6.0-0 d6 7.Nc3 c6 

• A88 Dutch, King-Fianchetto, Leningrad, Main, Warsaw: 1.d4 f5 2.c4 Nf6 3.g3 g6 4.Bg2 Bg7 5.Nf30-0 6.0-0 d6 7.Nc3 c6

• A89 Dutch, King-Fianchetto, Leningrad, Main, Matulovic: 1.d4 f5 2.g3 Nf6 3.Bg2 g6 4.Nf3 Bg7 5.0-0 0-0 6.c4 d6 7.Nc3 Nc6

• A90 Dutch, Classical: 1.d4 f5 2.c4 Nf6 3.g3 e6

   Accelerated Stonewall:  4.Bg2 d5    → Modern                5.Nf3 c6 6.0-0 Bd6    Colle:                  4.Bg2 c5    Classical Nimzo-Dutch:  4.Bg2 Bb4+    → Alekhine Variation:   → 5.Bd2 

• A91 Dutch, Classical: 1.d4 f5 2.c4 Nf6 3.g3 e6 4.Bg2 Be7

   Flohr:                  5.Nc3 0-0 6.d5    Blackburne:             5.Nh3 

• A92 Dutch, Classical: 1.d4 f5 2.c4 Nf6 3.g3 e6 4.Bg2 Be7 5.Nf3 '

   Stonewall:                5...0-0 6.0-0 d5    Alekhine:                 5...0-0 6.0-0 Ne4 

• A93 Dutch, Stonewall: 1.d4 f5 2.c4 Nf6 3.g3 e6 4.Bg2 Be7 5.Nf3 0-0 6.0-0 d5

• A94 Dutch, Stonewall, Botvinnik: 1.d4 f5 2.c4 Nf6 3.g3 e6 4.Bg2 Be7 5.Nf3 0-0 6.0-0 d5 7.b3

• A95 Dutch, Stonewall: 1.d4 f5 2.c4 Nf6 3.g3 e6 4.Bg2 Be7 5.Nf3 0-0 6.0-0 d5 7.Nc3 c6

   Steinitz:               8.b3    Keres:                  8.Rb1    Rubinstein:             8.Qb3    Chekhover:              8.Qc2 Qe8 9.Bg5    Gruenfeld:              8.Qd3 

• A96 Dutch, Classical: 1.d4 f5 2.c4 Nf6 3.g3 e6 4.Bg2 Be7 5.Nf3 0-0 6.0-0 d6

   Buenos Aires:           7.Nc3 a5    Huisl:                  7.Nc3 Ne4 

• A97 Dutch, Classical, Ilyin-Zhenevsky: 1.d4 f5 2.c4 Nf6 3.g3 e6 4.Bg2 Be7 5.Nf3 0-0 6.0-0 d6 7.Nc3 Qe8

   Stahlberg:                               8.Ne1    Winter:                                  8.Re1    Pirc:                                    8.Qb3    Veresov:                                 8.Qd3 

• A98 Dutch, Classical, Ilyin–Genevsky, Alatortsev-Lisitsyn: 1.d4 f5 2.c4 Nf6 3.g3 e6 4.Bg2 Be7 5.Nf3 0-0 6.0-0 d6 7.Nc3 Qe8 8.Qc2

• A99 Dutch, Classical, Ilyin–Genevsky, Modern: 1.d4 f5 2.c4 Nf6 3.g3 e6 4.Bg2 Be7 5.Nf3 0-0 6.0-0 d6 7.Nc3 Qe8 8.b3

• 1.e4 without 1...c5, 1...e6 or 1...e5 (B00–B19)
• 1.e4 c5: Sicilian Defence (B20–B99)

===B00–B19=== 1.e4 without 1...c5, 1...e6 or 1...e5

• B00 King's Pawn Game 1.e4

• B00 Ware or Corn Stalker: 1.e4 a5

   → Snagkeouss:              → 2.d4 Nc6 

• B00 St. George: 1...a6

   → Nanu                     → 2.d4 b5    → → San Jorge:             → → 3.Nf3 Bb7 4.Bd3 d6 5.0-0 g6 6.c3 Bg7    → → Polish Setup:          → → 3.Nf3 Bb7 4.Bd3 e6    → McKay:                   → 2.d4 c5    → Zilbermints Gambit:      → 2.d4 e5    → Woodchuck:               → 2.d4 Nc6 

• B00 Owen: 1.e4 b6

   → Hekili-Loa Gambit:       → 2.d4 c5 3.dxc5 Nc6    → Guatemala:               → 2.d4 Ba6    → Wind Gambit:             → 2.d4 Bb7 3.f3 e5    → Smith Gambit:            → 2.d4 Bb7 3.Nf3    → Matovinsky Gambit:       → 2.d4 Bb7 3.Bd3 f5 4.exf5 Bxg2 5.Qh5+ g6    → Naselwaus Gambit:        → 2.d4 Bb7 3.Bg5    → Bird Setup:              → 2.f4    → Boden:                   → 2.g3 

• B00 Duras Gambit: 1.e4 f5

   → Accepted:                → 2.ef5 

• B00 Barnes: 1.e4 f6

   → Unicorn:                 → 2.d4 b6 3.c4 Bb7    → Fried Fox:               → 2.d4 Kf7 

• B00 Borg: 1.e4 g5

   → Borg Gambit:             → 2.d4 Bg7    → Zilbermints Gambit:      → 2.d4 e5    → Spoeelman:               → 2.d4 h6 3.h4    → Troon Gambit:            → → 2.d4 h6 3.h4 g4 

• B00 Goldsmith or Pickering: 1.e4 h5

   → Picklepuss Defense:      → 2.d4 Nf6 

• B00 Carr: 1.e4 h6

   → Morphy:                  → 2.d4    → → Zilbermints Gambit:    → → 2.d4 e5 

• B00 Lemming: 1.e4 Na6

• B00 Nimzowitsch: 1.e4 Nc6

   Wheeler Gambit:                      2.b4    Pseudo-Spanish:                      2.Bb5    Woodchuck:                           2.d4 a6    Scandinavian Setup:                  2.d4 d5    → Hornung Gambit:                    → 3.Be3    → Advance:                           → 3.e5    → Aachen Gambit:                     → 3.exd5 Nb4    → Exchange:                          → 3.exd5 Qxd5    → → Marshall Gambit:                 → → 4.Nc3    → Bogoljubow:                        → 3.Nc3    → → Brandics Gambit:                 → → 3...a6    → → Berlin Gambit:                   → → 3...dxe4 4.d5    → → → Richter Gambit:                → → → 4...Nb8 5.f3    → → → Nimzowitsch Gambit:            → → → 4...Ne5    → → Heinola-Deppe Gambit:            → → 3...e5    → → Erben Gambit:                    → → 3...g6    → → Vehre:                           → → 3...Nf6    Mikenas:                             2.d4 d6    Kennedy:                             2.d4 e5    → Linksspringer:                     → 3.d5    → → Riemann:                         → → 3...Nb8    → → Capablanca:                      → → 3...Nce7 4.Bd3    → Bielefelder Gambit:                → 3.dxe5 Bc5    → De Smet Gambit:                    → 3.dxe5 d6    → Hammer Gambit:                     → 3.dxe5 f6    → Riemann:                           → 3.dxe5 Nxe5 4.f4 Nc6    → Main Line:                         → 3.dxe5 Nxe5 4.f4 Ng6    → → Loewenthal:                      → → 5.Be3    → → Winawer:                         → → 5.Nf3    → Keres:                             → 3.dxe5 Nxe5 4.Nc3    → Paulsen Attack:                    → 3.dxe5 Nxe5 4.Nf3    → Herford Gambit:                    → 3.dxe5 Qh4    Neo-Mongoloid:                       2.d4 f6    De Saint Bon:                        2.f4    Prins:                               2.Nc3 d6    French Connection:                   2.Nc3 e6    Pirc Connection:                     2.Nc3 g6    Breyer:                              2.Nc3 Nf6 3.d4 e5    Declined:                            2.Nf3    → Williams:                          → 2...d6    Franco-Nimzo:                        2.Nf3 e6    Colorado Countergambit:              2.Nf3 f5    → Colorado Countergambit Accepted:   → 3.exf5    El Columpio:                         2.Nf3 Nf6 3.e5 Ng4    → Pin Variation:                     → 4.d4 d6 5.h3 Nh6 6.Bb5    → El Columpio Gambit:                → 4.d4 d6 5.h3 Nh6 6.e6    → Exchange:                          → 4.d4 d6 5.h3 Nh6 6.exd6 

• B00 Hippopotamus Defense: 1.e4 Nh6

• B01 Scandinavian Defence 1.e4 d5

   Zilbermints Gambit:                2.b4    Blackburne-Kloosterboer Gambit:    2.exd5 c6    → Kloosterboer Gambit:             → 3.dxc6 e5    → Blackburne Gambit:               → 3.dxc6 Nxc6    Boehnke Gambit:                    2.exd5 e5 3.dxe6 Bxe6    Modern:                            2.exd5 Nf6    → Panov Transfer:                  → 3.c4 c6    → Icelandic-Palme Gambit:          → 3.c4 e6    → Portuguese Gambit:               → 3.d4 Bg4    → → Banker:                        → → 4.f3 Bf5 5.c4    → → Correspondence Refutation:     → → 4.f3 Bf5 5.g4    → → Jadoul:                        → → 4.f3 Bf5 5.Bb5+ Nbd7 6.c4    → → Melbourne Shuffle:             → → 4.f3 Bf5 5.Bb5+ Nbd7 6.Nc3    → → Classical:                     → → 4.Nf3    → → Elbow:                         → → 4.Bb5+ c6    → → Lusophobe:                     → → 4.Bb5+ Nbd7 5.Be2    → → Wuss:                          → → 4.Be2    → Kádas Gambit:                    → 3.d4 c6 4.dxc6 e5    → Richter:                         → 3.d4 g6    → → Wing Gambit:                   → → 4.c4 b5    → Marshall:                        → 3.d4 Nxd5    → → Kiel:                          → → 4.c4 Nb4    → → Morphy:                        → → 4.c4 Nf6    → → → Pin:                         → → → 5.Nf3 Bg4    → → Gipslis:                       → → 4.Nf3 Bg4    → → Delayed Richter:               → → 4.Nf3 g6    → → Loewenthal:                    → → 4.Bc4    → Classical Exchange:              → 2.exd5 Qxd5    → → Mieses-Kotroc Gambit           → → 3.b4    → → Main:                          → → 3.Nc3 Qa5    → → → Leonhardt Gambit:            → → → 4.b4    → → → Anderssen Counterattack:     → → → 4.d4 e5    → → → → Orthodox Attack:           → → → → 5.dxe5 Nc6 6.Nf3 Bb4 7.Bd2    → → → → Goteborg:                  → → → → 5.Nf3    → → → → → Collijn:                 → → → → → 5...Bg4    → → → Mieses:                      → → → 4.d4 Nf6    → → → → Classical:                 → → → → 5.Nf3 Bf5    → → → → → Grünfeld:                → → → → → 6.Ne5 c6 7.g4    → → → → Lasker:                    → → → → 5...Bg4 6.h3    → → Gubinsky-Melts:                → → 3.Nc3 Qd6    → → → Schiller-Pytel:              → → → 4.d4 c6    → → → Bronstein:                   → → → 4.d4 Nf6 5.Nf3 a6    → → Valencian:                     → → 3.Nc3 Qd8    → → → Ilundain:                    → → → 4.d4 Nf6 5.Nf3 c6    → → Pin:                           → → 3.Nf3 Bg4    Closed:                            2.Nc3    → Grünfeld:                        → 2...dxe4 3.Nxe4 e5    Tennison Gambit:                   2.Nf3    → Paris:                           2...de4 3.Ng5 Bf5  

B02 Alekhine's Defence: 1.e4 Nf6

   John Tracy Gambit:            2.Nf3    Krejcik:                      2.Bc4    → Krejcik Gambit:             → 2...Nxe4 3.Bxf7+    Maróczy:                      2.d3    → Russian:                    → 2...c5 3.f4    → Radisch Gambit:             → 2...e5 3.f4 Bc4    → Double King-Fianchetto:     → 2...g6 3.g3 Bg7 4.Bg7    Main:                         2.e5 Nd5    → Welling:                    → 3.b3    → Kmoch:                      → 3.Bc4 Nb6 4.Bb3 c5 5.d3    → Two Pawns Attack:           → 3.c4    → → Bonstein:                 → → 3...Nb4    → → Tate:                     → → 3...Nb6 4.a4    → → Steiner:                  → → 3...Nb6 4.b3    → → Lasker:                   → → 3...Nb6 4.c5    → → → Matsukevich Gambit:     → → → 4...Nd5 5.Nc3 Nxc3 6.dxc3 d6 7.Bg5    → → → Hunt:                   → → → 4...Nd5 5.Bc4 e6 6.Nc3    → → → Mikenas:                → → → 4...Nd5 5.Bc4 e6 6.Nc3 d6    → → → → Mikenas Gambit:       → → → → 7.Nxd5 exd5 8.Bxd5    → → Squirrel or Mazzoleni:    → → 3...Nf4    → Buckley:                    → 3.Na3    → Sämisch:                    → 3.Nc3    Mokele Mbembe:                2.e5 Ne4    → Vavra Defense:              → 3.d4 e6    → Modern:                     → 3.d4 f6    Brooklyn Variation:           2.e5 Ng8    → Everglades Variation:       → 3.d4 f5    Scandinavian Setup:           2.Nc3 d5    → Myers Gambit:               → 3.d3 dxe4 4.Bg5    → Hanham:                     → 3.e5 d4 4.ef6 dc3    → Spielmann Gambit:           → 3.e5 Nfd7 4.e6    → Moscow:                     → 3.e5 Ne4 Nce2    → Noah Gambit:                → 3.exd5    → → Accepted:                 → 3.exd5 Nd5    → Geschev Gambit:             → 3.exd5 c6 

B03: Alekhine Defense: 1.e4 Nf6 2.e5 Nd5 3.d4

   O'Sullivan Gambit:       3...b5    Hunt:                    3...d6 4.c4 Nb6 5.c5    Exchange:                3...d6 4.c4 Nb6 5.exd6    → Karpov:                → 5...cxd6 6.Nc3 g6 7.h3 Bg7 8.Nf3 0-0 9.Be2 Nc6 10.0-0 Bf5 11.Bf4    → Voronezh:              → 5...cxd6 6.Nc3 g6 7.Be3 Bg7 8.Rc1 0-0 9.b3    Alekhine Gambit:         3...d6 4.c4 Nb6 5.Nf3 Bg4 6.Be2    Lokvenc:                 3...d6 4.f4    Balogh:                  3...d6 4.Bc4    4-Pawn:                  3...d6 4.c4 Nb6 5.f4    → Ilyin-Zhenevsky:       → 5...dxe5 6.fxe5 Nc6 7.Nf3 Bg4 8.e6 fxe6 9.c5    → Main:                  → 5...dxe5 6.fxe5 Nc6 7.Be3    → → Tartakower:          → → 7...Bf5 8.Nc3 e6 9.Nf3 Qd7 10.Be2 0-0-0 11.0-0 Be7    → Korchnoi:              → 5...dxe5 6.fxe5 Bf5 7.Nc3 e6 8.Nf3 Be7 9.Be2 0-0 10.0-0 f6    → Fianchetto:            → 5...g6    → Cambridge Gambit:      → 5...g5    → Trifunovic:            → 5...Bf5    Westerinen:              3...Nb6    Fine:                    3...Nc6 

B04: Alekhine, Modern: 1.e4 Nf6 2.e5 Nd5 3.d4 d6 4.Nf3

   Miles:                   4...c6    Larsen/Kengis:           4...dxe5    Alburt:                  4...g6    → Keres:                 → 5.Bc4 Nb6 6.Bb3 Bg7 7.a4    Lothar Schmid:           4...Nb6    Larsen-Haakert:          4...Nc6    Tarrasch:                4...Bf4 

B05: Alekhine, Modern, Main: 1.e4 Nf6 2.e5 Nd5 3.d4 d6 4.Nf3 Bg4

   Alekhine:                      5.c4    → Vitolins Attack:             → 5...Nb6 6.d5    Panov:                         5.h3    Yates:                         5.Bc4    Flohr:                         5.Be2 c6 

B06 Robatsch or Modern 1.e4 g6

   Lizard:                             2.d4 d6    Delmar:                             2.d4 Nh6    → Masur Gambit:                     → 3.Nc3 f5 Bh6 Bh6 5.ef5 0-0    Pterodactyl, Benoni Quetzalcoatlus: 2.d4 Bg7 3.c4 c5 4.d5 d6 5.Nc3 Qa5    Dunworthy:                          2.d4 Bg7 3.c4 d5 4.exd5 c6 5.dxc6 Bxd4    Pterodactyl, Quetzalcoatlus Gambit: 2.d4 Bg7 3.c4 c5 4.Nc3 d6 5.dxc5 Qa5    Semi-Averbakh:                      2.d4 Bg7 3.c4 c5 4.Nf3 d6 5.Be2 Qa5+    Pterodactyl, Anhanguera:            2.d4 Bg7 3.c4 c5 4.Nc3 d6 5.Be3 Qa5    3-Pawn:                             2.d4 Bg7 3.f4    → Bardeleben                        → 3...c5    → → Austrian:                         → 4.c3 Qa5    → → Austriadactylus Western:          → 4.Nf3 Qa5+    Fianchetto, Rhamphorhynchus:        2.d4 Bg7 3.g3 c5 4.dxc5 Qa5+    Fianchetto, King Pterodactyl:       2.d4 Bg7 3.g3 c5 4.Nf3 Qa5+    Szabo:                              2.d4 Bg7 3.h4    Mongredien:                         2.d4 Bg7 3.Nc3 b6    Gurgenidze:                         2.d4 Bg7 3.Nc3 c6 4.f4 d5 5.e5 h5    Suttles:                            2.d4 Bg7 3.Nc3 c6 4.Nf3 d6    Anti-Modern:                        2.d4 Bg7 3.Nc3 c6 4.Bc4 d6 5.Qe2    Modern Pterodactyl:                 2.d4 Bg7 3.Nc3 c5    → Rhamphorhynchus:                  → 4.dxc5    → → Pteranodon:                     → → 4...Bxc3+ 5.bxc3 Qa5    → → Pterodactyl:                    → → 4...Qa5    → Benoni Pteranodon:                → 4.d5 Bxc3+ 5.bxc3 Qa5    → Sicilian, Siroccopteryx:          → 4.Nf3 Qa5 5.Bc4    → Sicilian, Quetzalcoatlus:         → 4.Nf3 Qa5 5.Be2 d6    → Eastern, Anhanguera:              → 4.Be3    Mittelberger Gambit:                2.d4 Bg7 3.Nc3 d5    Bishop:                             2.d4 Bg7 3.Bc4    → Bücker Gambit:                    → 3...b5    Westermann Gambit:                  2.d4 Bg7 3.Bd2    Wind Gambit:                        2.d4 Bg7 3.Bd3    Blatny:                             2.d4 Bg7 3.Be2    Bishop Attack, Monkey's Bum:        2.Bc4 Bg7 3.Qf3 e6 4.d4 Bxd4    Lizard Defense, Mittenberger Gambit: 1.e4 g6 2.d4 Bg7 3.Nc3 d5 

• Modern Defense: Standard Defense: 1.e4 g6 2.d4 Bg7 3.Nc3 d6
• Modern Defense: Pseudo-Austrian Attack: 1.e4 g6 2.d4 Bg7 3.Nc3 d6 4.f4
• Modern Defense: Two Knights Variation: 1.e4 g6 2.d4 Bg7 3.Nc3 d6 4.Nf3
• Modern Defense: Two Knights Variation, Suttles Variation, Tal Gambit: 1.e4 g6 2.d4 Bg7 3.Nc3 d6 4.Nf3 c6 5.Bg5 Qb6 6.Qd2 Qxb2
• Modern Defense: Mongredien Defense, with Nf3: 1.e4 g6 2.d4 Bg7 3.Nf3 b6
• Pterodactyl Defense: Western, Anhanguera: 1.e4 g6 2.d4 Bg7 3.Nf3 c5 4.Be3 Qa5+
• Rat Defense: Accelerated Gurgenidze: 1.e4 g6 2.d4 d6 3.Nc3 c6
• Modern Defense: Fianchetto Gambit: 1.e4 g6 2.d4 f5
• Modern Defense: Norwegian Defense: 1.e4 g6 2.d4 Nf6
• Modern Defense: Norwegian Defense, Norwegian Gambit: 1.e4 g6 2.d4 Nf6 3.e5 Nh5 4.Be2 d6
• Modern Defense: Masur Gambit: 1.e4 g6 2.d4 Nh6 3.Nc3 f5 4.Bxh6 Bxh6 5.exf5 0-0
• Pterodactyl Defense: Austrian, Grand Prix Pterodactyl: 1.e4 g6 2.Nc3 Bg7 3.f4 c5 4.Nf3 Qa5
• Pterodactyl Defense: Western, Siroccopteryx: 1.e4 g6 2.Nf3 Bg7 3.d4 c5 4.Bc4 cxd4 5.Nxd4 Qa5+

B07 Pirc Defence

• King's Pawn Game: Maróczy Defense: 1.e4 d6 2.d4 e5
• Czech Defense: 1.e4 d6 2.d4 Nf6 3.Nc3 c6
• Pirc Defense: 1.e4 d6 2.d4 Nf6 3.Nc3 g6
• Pirc Defense: Kholmov System: 1.e4 d6 2.d4 Nf6 3.Nc3 g6 4.Bc4
• Pirc Defense: Chinese Variation: 1.e4 d6 2.d4 Nf6 3.Nc3 g6 4.Be2 Bg7 5.g4
• Pirc Defense: Bayonet Attack: 1.e4 d6 2.d4 Nf6 3.Nc3 g6 4.Be2 Bg7 5.h4
• Pirc Defense: 150 Attack, Sveshnikov-Janša Attack: 1.e4 d6 2.d4 Nf6 3.Nc3 g6 4.Be3 c6 5.h3
• Pirc Defense: 150 Attack: 1.e4 d6 2.d4 Nf6 3.Nc3 g6 4.Be3 c6 5.Qd2
• Pirc Defense: 150 Attack, Inner Doll Defense: 1.e4 d6 2.d4 Nf6 3.Nc3 g6 4.Be3 c6 5.Qd2 Bg4
• Pirc Defense: Byrne Variation: 1.e4 d6 2.d4 Nf6 3.Nc3 g6 4.Bg5
• Pirc Defense: Sveshnikov System: 1.e4 d6 2.d4 Nf6 3.Nc3 g6 4.g3
• Lion Defense: Anti-Philidor: 1.e4 d6 2.d4 Nf6 3.Nc3 Nbd7 4.f4
• Lion Defense: Anti-Philidor, Lion's Cave: 1.e4 d6 2.d4 Nf6 3.Nc3 Nbd7 4.f4 e5
• Lion Defense: Anti-Philidor, Lion's Cave, Lion Claw Gambit: 1.e4 d6 2.d4 Nf6 3.Nc3 Nbd7 4.f4 e5 5.Nf3 exd4 6.Qxd4 c6 7.Bc4 d5
• Lion Defense: Bayonet Attack: 1.e4 d6 2.d4 Nf6 3.Nc3 Nbd7 4.g4
• Modern Defense: Geller's System: 1.e4 g6 2.d4 Bg7 3.Nf3 d6 4.c3

B08 Pirc, Classical (Two Knights) System

• Pirc Defense: Classical Variation: 1.e4 d6 2.d4 Nf6 3.Nc3 g6 4.Nf3
• Pirc Defense: Classical Variation: 1.e4 d6 2.d4 Nf6 3.Nc3 g6 4.Nf3 Bg7
• Pirc Defense: Classical Variation, Quiet System: 1.e4 d6 2.d4 Nf6 3.Nc3 g6 4.Nf3 Bg7 5.Be2
• Pirc Defense: Classical Variation, Quiet System, Parma Defense: 1.e4 d6 2.d4 Nf6 3.Nc3 g6 4.Nf3 Bg7 5.Be2 0-0 6.0-0 Bg4
• Pirc Defense: Classical Variation, Quiet System, Czech Defense: 1.e4 d6 2.d4 Nf6 3.Nc3 g6 4.Nf3 Bg7 5.Be2 0-0 6.0-0 c6
• Pirc Defense: Classical Variation, Quiet System, Chigorin Line: 1.e4 d6 2.d4 Nf6 3.Nc3 g6 4.Nf3 Bg7 5.Be2 0-0 6.0-0 Nc6
• Pirc Defense: Classical Variation, Schlechter Variation: 1.e4 d6 2.d4 Nf6 3.Nc3 g6 4.Nf3 Bg7 5.h3

B09 Pirc, Austrian Attack

• Pirc Defense: Austrian Attack: 1.e4 d6 2.d4 Nf6 3.Nc3 g6 4.f4
• Pirc Defense: Austrian Attack, Ljubojevic Variation: 1.e4 d6 2.d4 Nf6 3.Nc3 g6 4.f4 Bg7 5.Bc4
• Pirc Defense: Austrian Attack, Dragon Formation: 1.e4 d6 2.d4 Nf6 3.Nc3 g6 4.f4 Bg7 5.Nf3 c5
• Pirc Defense: Austrian Attack: 1.e4 d6 2.d4 Nf6 3.Nc3 g6 4.f4 Bg7 5.Nf3 0-0
• Pirc Defense: Austrian Attack, Weiss Variation: 1.e4 d6 2.d4 Nf6 3.Nc3 g6 4.f4 Bg7 5.Nf3 0-0 6.Bd3
• Pirc Defense: Austrian Attack, Kurajica Variation: 1.e4 d6 2.d4 Nf6 3.Nc3 g6 4.f4 Bg7 5.Nf3 0-0 6.Be3
• Pirc Defense: Austrian Attack, Unzicker Attack: 1.e4 d6 2.d4 Nf6 3.Nc3 g6 4.f4 Bg7 5.Nf3 0-0 6.e5
• Pirc Defense: Austrian Attack, Unzicker Attack, Bronstein Variation: 1.e4 d6 2.d4 Nf6 3.Nc3 g6 4.f4 Bg7 5.Nf3 0-0 6.e5 Nfd7 7.h4

B10 Caro–Kann Defence

• Caro-Kann Defense: 1.e4 c6
• Caro-Kann Defense: Euwe Attack: 1.e4 c6 2.b3
• Caro-Kann Defense: Labahn Attack: 1.e4 c6 2.b4
• Caro-Kann Defense: Labahn Attack, Double Gambit: 1.e4 c6 2.b4 d5 3.b5
• Caro-Kann Defense: Labahn Attack, Polish Variation: 1.e4 c6 2.b4 e5 3.Bb2
• Caro-Kann Defense: Hillbilly Attack: 1.e4 c6 2.Bc4
• Caro-Kann Defense: Hillbilly Attack, Schaeffer Gambit: 1.e4 c6 2.Bc4 d5 3.Bb3 dxe4 4.Qh5
• Caro-Kann Defense: Accelerated Panov Attack: 1.e4 c6 2.c4
• Caro-Kann Defense: Accelerated Panov Attack: 1.e4 c6 2.c4 d5
• Caro-Kann Defense: Accelerated Panov Attack, Van Weersel Attack: 1.e4 c6 2.c4 d5 3.cxd5 cxd5 4.Qb3
• Caro-Kann Defense: Toikkanen Gambit: 1.e4 c6 2.c4 d5 3.e5
• Caro-Kann Defense: Accelerated Panov Attack, Modern Variation: 1.e4 c6 2.c4 d5 3.exd5 cxd5 4.cxd5 Nf6
• Caro-Kann Defense: Accelerated Panov Attack, Pseudo-Scandinavian: 1.e4 c6 2.c4 d5 3.exd5 Qxd5
• Caro-Kann Defense: Accelerated Panov Attack, Open Variation: 1.e4 c6 2.c4 e5
• Caro-Kann Defense: Breyer Variation: 1.e4 c6 2.d3
• Caro-Kann Defense: Breyer Variation, Stein Attack: 1.e4 c6 2.d3 d5 3.Nd2 g6 4.Ngf3 Bg7 5.g3 e5 6.Bg2 Ne7 7.0-0 0-0 8.b4
• Caro-Kann Defense: Spike Variation: 1.e4 c6 2.g4
• Caro-Kann Defense: Spike Variation, Scorpion-Grob Gambit: 1.e4 c6 2.g4 d5 3.Nc3 dxe4 4.d3
• Caro-Kann Defense: 1.e4 c6 2.Nc3
• Caro-Kann Defense: 1.e4 c6 2.Nc3 d5
• Caro-Kann Defense: Scorpion-Horus Gambit: 1.e4 c6 2.Nc3 d5 3.d3 dxe4 4.Bg5
• Caro-Kann Defense: St. Patrick's Attack: 1.e4 c6 2.Nc3 d5 3.h3
• Caro-Kann Defense: Two Knights Attack: 1.e4 c6 2.Nc3 d5 3.Nf3
• Caro-Kann Defense: Hector Gambit: 1.e4 c6 2.Nc3 d5 3.Nf3 dxe4 4.Ng5
• Caro-Kann Defense: Goldman Variation: 1.e4 c6 2.Nc3 d5 3.Qf3
• Caro-Kann Defense: Endgame Offer: 1.e4 c6 2.Nf3 d5 3.d3
• Caro-Kann Defense: Endgame Variation: 1.e4 c6 2.Nf3 d5 3.d3 dxe4 4.dxe4 Qxd1+ 5.Kxd1
• Caro-Kann Defense: Apocalypse Attack: 1.e4 c6 2.Nf3 d5 3.exd5 cxd5 4.Ne5

B11 Caro–Kann, Two knights, 3...Bg4

• Caro-Kann Defense: Two Knights Attack, Mindeno Variation: 1.e4 c6 2.Nc3 d5 3.Nf3 Bg4
• Caro-Kann Defense: Two Knights Attack, Mindeno Variation, Retreat Line: 1.e4 c6 2.Nc3 d5 3.Nf3 Bg4 4.h3 Bh5
• Caro-Kann Defense: Two Knights Attack, Mindeno Variation, Exchange Line: 1.e4 c6 2.Nc3 d5 3.Nf3 Bg4 4.h3 Bxf3

B12 Caro–Kann Defence

• Caro-Kann Defense: 1.e4 c6 2.d4
• Caro-Kann Defense: 1.e4 c6 2.d4 d5
• Caro-Kann Defense: Mieses Attack, Landau Gambit: 1.e4 c6 2.d4 d5 3.Bd3 Nf6 4.e5 Nfd7 5.e6
• Caro-Kann Defense: Mieses Gambit: 1.e4 c6 2.d4 d5 3.Be3
• Caro-Kann Defense: Advance Variation: 1.e4 c6 2.d4 d5 3.e5
• Caro-Kann Defense: Advance Variation, Prins Attack: 1.e4 c6 2.d4 d5 3.e5 Bf5 4.b4
• Caro-Kann Defense: Advance, Short Variation: 1.e4 c6 2.d4 d5 3.e5 Bf5 4.c3 e6 5.Be2
• Caro-Kann Defense: Advance Variation, Bayonet Attack: 1.e4 c6 2.d4 d5 3.e5 Bf5 4.g4
• Caro-Kann Defense: Advance Variation, Tal Variation: 1.e4 c6 2.d4 d5 3.e5 Bf5 4.h4
• Caro-Kann Defense: Advance Variation, Van der Wiel Attack: 1.e4 c6 2.d4 d5 3.e5 Bf5 4.Nc3
• Caro-Kann Defense: Advance Variation, Van der Wiel Attack: 1.e4 c6 2.d4 d5 3.e5 Bf5 4.Nc3 e6 5.g4 Bg6 6.Nge2 c5 7.h4
• Caro-Kann Defense: Advance Variation, Van der Wiel Attack, Dreyev Defense: 1.e4 c6 2.d4 d5 3.e5 Bf5 4.Nc3 Qb6
• Caro-Kann Defense: Advance Variation, Bronstein Variation: 1.e4 c6 2.d4 d5 3.e5 Bf5 4.Ne2
• Caro-Kann Defense: Advance Variation, Short Variation: 1.e4 c6 2.d4 d5 3.e5 Bf5 4.Nf3
• Caro-Kann Defense: Advance Variation, Botvinnik-Carls Defense: 1.e4 c6 2.d4 d5 3.e5 c5
• Caro-Kann Defense: Maróczy Variation: 1.e4 c6 2.d4 d5 3.f3
• Caro-Kann Defense: Maróczy Variation, Maróczy Gambit: 1.e4 c6 2.d4 d5 3.f3 dxe4 4.fxe4 e5 5.Nf3 exd4 6.Bc4
• Caro-Kann Defense: Modern Variation: 1.e4 c6 2.d4 d5 3.Nd2
• Caro-Kann Defense: Edinburgh Variation: 1.e4 c6 2.d4 d5 3.Nd2 Qb6
• Caro-Kann Defense: Ulysses Gambit: 1.e4 c6 2.d4 d5 3.Nf3 dxe4 4.Ng5
• Caro-Kann Defense: Massachusetts Defense: 1.e4 c6 2.d4 f5
• Caro-Kann Defense: De Bruycker Defense: 1.e4 c6 2.d4 Na6
• Caro-Kann Defense: De Bruycker Defense: 1.e4 c6 2.d4 Na6 3.Nc3 Nc7
• Caro-Kann Defense: Masi Variation: 1.e4 c6 2.d4 Nf6

B13 Caro–Kann, Exchange Variation

• Caro-Kann Defense: Exchange Variation: 1.e4 c6 2.d4 d5 3.exd5
• Caro-Kann Defense: Exchange Variation, Rubinstein Variation: 1.e4 c6 2.d4 d5 3.exd5 cxd5 4.Bd3 Nc6 5.c3 Nf6 6.Bf4
• Caro-Kann Defense: Panov Attack: 1.e4 c6 2.d4 d5 3.exd5 cxd5 4.c4
• Caro-Kann Defense: Panov Attack, Gunderam Attack: 1.e4 c6 2.d4 d5 3.exd5 cxd5 4.c4 Nf6 5.c5
• Caro-Kann Defense: Panov Attack: 1.e4 c6 2.d4 d5 3.exd5 cxd5 4.c4 Nf6 5.Nc3
• Caro-Kann Defense: Panov Attack, Modern Defense: 1.e4 c6 2.d4 d5 3.exd5 cxd5 4.c4 Nf6 5.Nc3 Nc6
• Caro-Kann Defense: Panov-Botvinnik, Herzog Defense: 1.e4 c6 2.d4 d5 3.exd5 cxd5 4.c4 Nf6 5.Nc3 Nc6 6.Bg5 dxc4 7.d5 Na5
• Caro-Kann Defense: Panov Attack, Modern Defense, Carlsbad Line: 1.e4 c6 2.d4 d5 3.exd5 cxd5 4.c4 Nf6 5.Nc3 Nc6 6.Bg5 e6
• Caro-Kann Defense: Panov Attack, Modern Defense, Czerniak Line: 1.e4 c6 2.d4 d5 3.exd5 cxd5 4.c4 Nf6 5.Nc3 Nc6 6.Bg5 Qa5
• Caro-Kann Defense: Panov Attack, Modern Defense, Reifir-Spielmann Line: 1.e4 c6 2.d4 d5 3.exd5 cxd5 4.c4 Nf6 5.Nc3 Nc6 6.Bg5 Qb6
• Caro-Kann Defense: Panov Attack, Modern Defense, Mieses Line: 1.e4 c6 2.d4 d5 3.exd5 cxd5 4.c4 Nf6 5.Nc3 Nc6 6.Nf3 Bg4
• Caro-Kann Defense: Exchange Variation, Bulla Attack: 1.e4 c6 2.d4 d5 3.exd5 cxd5 4.g4
• Caro-Kann Defense: Exchange Variation: 1.e4 c6 2.d4 d5 3.exd5 cxd5 4.Nf3 Nc6

B14 Caro–Kann, Panov–Botvinnik Attack, 5...e6

• Caro-Kann Defense: Panov Attack: 1.e4 c6 2.d4 d5 3.exd5 cxd5 4.c4 Nf6 5.Nc3 e6
• Caro-Kann Defense: Panov Attack, Main Line: 1.e4 c6 2.d4 d5 3.exd5 cxd5 4.c4 Nf6 5.Nc3 e6 6.Nf3 Bb4
• Caro-Kann Defense: Panov Attack, Fianchetto Defense: 1.e4 c6 2.d4 d5 3.exd5 cxd5 4.c4 Nf6 5.Nc3 g6
• Caro-Kann Defense: Panov Attack, Fianchetto Defense, Fianchetto Gambit: 1.e4 c6 2.d4 d5 3.exd5 cxd5 4.c4 Nf6 5.Nc3 g6 6.cxd5 Bg7

B15 Caro–Kann Defence

• Caro-Kann Defense: 1.e4 c6 2.d4 d5 3.Nc3
• Caro-Kann Defense: Gurgenidze Counterattack: 1.e4 c6 2.d4 d5 3.Nc3 b5
• Caro-Kann Defense: 1.e4 c6 2.d4 d5 3.Nc3 dxe4
• Caro-Kann Defense: von Hennig Gambit: 1.e4 c6 2.d4 d5 3.Nc3 dxe4 4.Bc4
• Caro-Kann Defense: Rasa-Studier Gambit: 1.e4 c6 2.d4 d5 3.Nc3 dxe4 4.f3
• Caro-Kann Defense: Alekhine Gambit: 1.e4 c6 2.d4 d5 3.Nc3 dxe4 4.Nxe4 Nf6 5.Bd3
• Caro-Kann Defense: Alien Gambit: 1.e4 c6 2.d4 d5 3.Nc3 dxe4 4.Nxe4 Nf6 5.Ng5 h6 6.Nxf7
• Caro-Kann Defense: Tartakower Variation: 1.e4 c6 2.d4 d5 3.Nc3 dxe4 4.Nxe4 Nf6 5.Nxf6+ exf6
• Caro-Kann Defense: Forgacs Variation: 1.e4 c6 2.d4 d5 3.Nc3 dxe4 4.Nxe4 Nf6 5.Nxf6+ exf6 6.Bc4
• Caro-Kann Defense: Gurgenidze System: 1.e4 c6 2.d4 d5 3.Nc3 g6
• Caro-Kann Defense: Campomanes Attack: 1.e4 c6 2.d4 d5 3.Nc3 Nf6
• Caro-Kann Defense: Main Line: 1.e4 c6 2.d4 d5 3.Nd2 dxe4 4.Nxe4

B16 Caro–Kann, Bronstein–Larsen Variation

• Caro-Kann Defense: Bronstein-Larsen Variation: 1.e4 c6 2.d4 d5 3.Nc3 dxe4 4.Nxe4 Nf6 5.Nxf6+ gxf6
• Caro-Kann Defense: Finnish Variation: 1.e4 c6 2.d4 d5 3.Nd2 dxe4 4.Nxe4 h6

B17 Caro–Kann, Steinitz Variation, Smyslov Systems

• Caro-Kann Defense: Karpov Variation, Modern Variation, Kasparov Attack: 1.e4 c6 2.d4 d5 3.Nc3 dxe4 4.Nxe4 Nd7 5.Nf3 Ngf6 6.Ng3
• Caro-Kann Defense: Karpov Variation: 1.e4 c6 2.d4 d5 3.Nd2 dxe4 4.Nxe4 Nd7
• Caro-Kann Defense: Karpov Variation, Smyslov Variation: 1.e4 c6 2.d4 d5 3.Nd2 dxe4 4.Nxe4 Nd7 5.Bc4 Ngf6 6.Ng5 e6 7.Qe2 Nb6
• Caro-Kann Defense: Karpov Variation, Smyslov Variation, Main Line: 1.e4 c6 2.d4 d5 3.Nd2 dxe4 4.Nxe4 Nd7 5.Bc4 Ngf6 6.Ng5 e6 7.Qe2 Nb6 8.Bb3
• Caro-Kann Defense: Karpov Variation, Tiviakov-Fischer Attack: 1.e4 c6 2.d4 d5 3.Nd2 dxe4 4.Nxe4 Nd7 5.Bc4 Ngf6 6.Nxf6+ Nxf6
• Caro-Kann Defense: Karpov Variation, Modern Variation: 1.e4 c6 2.d4 d5 3.Nd2 dxe4 4.Nxe4 Nd7 5.Ng5
• Caro-Kann Defense: Karpov Variation, Modern Variation, Ivanchuk Defense: 1.e4 c6 2.d4 d5 3.Nd2 dxe4 4.Nxe4 Nd7 5.Ng5 Ndf6
• Caro-Kann Defense: Karpov Variation, Modern Main Line: 1.e4 c6 2.d4 d5 3.Nd2 dxe4 4.Nxe4 Nd7 5.Ng5 Ngf6 6.Bd3 e6 7.N1f3 Bd6 8.Qe2 h6 9.Ne4 Nxe4 10.Qxe4

B18 Caro–Kann, Classical Variation

• Caro-Kann Defense: Classical Variation: 1.e4 c6 2.d4 d5 3.Nd2 dxe4 4.Nxe4 Bf5
• Caro-Kann Defense: Classical Variation, Maróczy Attack: 1.e4 c6 2.d4 d5 3.Nd2 dxe4 4.Nxe4 Bf5 5.Ng3 Bg6 6.f4
• Caro-Kann Defense: Classical Variation, Main Line: 1.e4 c6 2.d4 d5 3.Nd2 dxe4 4.Nxe4 Bf5 5.Ng3 Bg6 6.h4
• Caro-Kann Defense: Classical Variation, Flohr Variation: 1.e4 c6 2.d4 d5 3.Nd2 dxe4 4.Nxe4 Bf5 5.Ng3 Bg6 6.Nh3

B19 Caro–Kann, Classical, 7...Nd7

• Caro-Kann Defense: Classical Variation: 1.e4 c6 2.d4 d5 3.Nd2 dxe4 4.Nxe4 Bf5 5.Ng3 Bg6 6.h4 h6 7.Nf3 Nd7
• Caro-Kann Defense: Classical Variation, Spassky Variation: 1.e4 c6 2.d4 d5 3.Nd2 dxe4 4.Nxe4 Bf5 5.Ng3 Bg6 6.h4 h6 7.Nf3 Nd7 8.h5
• Caro-Kann Defense: Classical Variation, Lobron System: 1.e4 c6 2.d4 d5 3.Nd2 dxe4 4.Nxe4 Bf5 5.Ng3 Bg6 6.h4 h6 7.Nf3 Nd7 8.h5 Bh7 9.Bd3 Bxd3 10.Qxd3 e6 11.Bd2 Ngf6 12.0-0-0 Be7
• Caro-Kann Defense: Classical Variation, Seirawan Variation: 1.e4 c6 2.d4 d5 3.Nd2 dxe4 4.Nxe4 Bf5 5.Ng3 Bg6 6.h4 h6 7.Nf3 Nd7 8.h5 Bh7 9.Bd3 Bxd3 10.Qxd3 Ngf6 11.Bd2 e6 12.0-0-0 Bd6

1.e4 c5: Sicilian Defence

• B20 Sicilian Defence, (any move for white without 2.Nc3 (B23–B26), 2.c3 (B22), 2.f4 (B21) and 2.Nf3 (B27–B99))
• Sicilian Defense: 1.e4 c5
• Sicilian Defense: Mengarini Variation: 1.e4 c5 2.a3
• Sicilian Defense: Myers Attack, with a4: 1.e4 c5 2.a4
• Sicilian Defense: Snyder Variation: 1.e4 c5 2.b3
• Sicilian Defense: Snyder Variation, Queen Fianchetto Variation: 1.e4 c5 2.b3 b6
• Sicilian Defense: Euwe Attack, Prins Gambit: 1.e4 c5 2.b3 d5 3.Bb2
• Sicilian Defense: Wing Gambit: 1.e4 c5 2.b4
• Sicilian Defense: Wing Gambit, Marshall Variation: 1.e4 c5 2.b4 cxb4 3.a3
• Sicilian Defense: Wing Gambit, Carlsbad Variation: 1.e4 c5 2.b4 cxb4 3.a3 bxa3
• Sicilian Defense: Wing Gambit, Marienbad Variation: 1.e4 c5 2.b4 cxb4 3.a3 d5 4.exd5 Qxd5 5.Bb2
• Sicilian Defense: Wing Gambit, Romanian Defense: 1.e4 c5 2.b4 cxb4 3.a3 d5 4.exd5 Qxd5 5.Nf3 e5 6.Bb2 Nc6 7.c4 Qe6
• Sicilian Defense: Wing Gambit, Nanu Gambit: 1.e4 c5 2.b4 cxb4 3.a3 d5 4.exd5 Qxd5 5.Nf3 e5 6.c4 Qe6 7.Bd3
• Sicilian Defense: Wing Gambit, Abrahams Variation: 1.e4 c5 2.b4 cxb4 3.Bb2
• Sicilian Defense: Wing Gambit, Santasiere Variation: 1.e4 c5 2.b4 cxb4 3.c4
• Sicilian Defense: Bowdler Attack: 1.e4 c5 2.Bc4
• Sicilian Defense: Staunton-Cochrane Variation: 1.e4 c5 2.c4
• Sicilian Defense: Gloria Variation: 1.e4 c5 2.c4 d6 3.Nc3 Nc6 4.g3 h5
• Sicilian Defense: Big Clamp Formation: 1.e4 c5 2.d3 Nc6 3.c3 d6 4.f4
• Sicilian Defense: Lasker-Dunne Attack: 1.e4 c5 2.g3
• Sicilian Defense: Grob Variation: 1.e4 c5 2.g4
• Sicilian Defense: Myers Attack, with h4: 1.e4 c5 2.h4
• Sicilian Defense: King David's Opening: 1.e4 c5 2.Ke2
• Sicilian Defense: Kronberger Variation: 1.e4 c5 2.Na3
• Sicilian Defense: Kronberger Variation, Nemeth Gambit: 1.e4 c5 2.Na3 Nc6 3.d4 cxd4 4.Bc4
• Sicilian Defense: Keres Variation: 1.e4 c5 2.Ne2
• Sicilian Defense: Brick Variation: 1.e4 c5 2.Nh3
• Sicilian Defense: Amazon Attack: 1.e4 c5 2.Qg4

• B21 Sicilian, Grand Prix Attack, 2.f4 (without 2...e5 (C30))
• Sicilian Defense: Smith-Morra Gambit: 1.e4 c5 2.d4
• Sicilian Defense: Smith-Morra Gambit: 1.e4 c5 2.d4 cxd4 3.c3
• Sicilian Defense: Smith-Morra Gambit Declined, Push Variation: 1.e4 c5 2.d4 cxd4 3.c3 d3
• Sicilian Defense: Smith-Morra Gambit Declined, Dubois Variation: 1.e4 c5 2.d4 cxd4 3.c3 d3 4.c4
• Sicilian Defense: Smith-Morra Gambit Declined, Scandinavian Formation: 1.e4 c5 2.d4 cxd4 3.c3 d5
• Sicilian Defense: Smith-Morra Gambit Accepted: 1.e4 c5 2.d4 cxd4 3.c3 dxc3
• Sicilian Defense: Smith-Morra Gambit, Danish Variation: 1.e4 c5 2.d4 cxd4 3.c3 dxc3 4.Nf3
• Sicilian Defense: Smith-Morra Gambit Accepted, Chicago Defense: 1.e4 c5 2.d4 cxd4 3.c3 dxc3 4.Nxc3 d6 5.Nf3 e6 6.Bc4 Nf6 7.0-0 a6
• Sicilian Defense: Smith-Morra Gambit Accepted, Taimanov Formation: 1.e4 c5 2.d4 cxd4 3.c3 dxc3 4.Nxc3 e6 5.Bc4 a6 6.Nf3 Ne7
• Sicilian Defense: Smith-Morra Gambit Accepted, Kan Formation: 1.e4 c5 2.d4 cxd4 3.c3 dxc3 4.Nxc3 e6 5.Nf3 a6
• Sicilian Defense: Smith-Morra Gambit Accepted, Finegold Defense: 1.e4 c5 2.d4 cxd4 3.c3 dxc3 4.Nxc3 e6 5.Nf3 d6 6.Bc4 a6 7.0-0 Be7 8.Qe2 Nf6
• Sicilian Defense: Smith-Morra Gambit Accepted, Sozin Formation: 1.e4 c5 2.d4 cxd4 3.c3 dxc3 4.Nxc3 Nc6 5.Bc4 e6 6.Nf3 d6 7.0-0 a6 8.Qe2 b5
• Sicilian Defense: Smith-Morra Gambit, Chicago Defense: 1.e4 c5 2.d4 cxd4 3.c3 dxc3 4.Nxc3 Nc6 5.Bc4 e6 6.Nf3 d6 7.0-0 a6 8.Qe2 b5 9.Bb3 Ra7
• Sicilian Defense: Smith-Morra Gambit Accepted, Classical Formation: 1.e4 c5 2.d4 cxd4 3.c3 dxc3 4.Nxc3 Nc6 5.Nf3 d6 6.Bc4 a6 7.0-0 Nf6
• Sicilian Defense: Smith-Morra Gambit Accepted, Scheveningen Formation: 1.e4 c5 2.d4 cxd4 3.c3 dxc3 4.Nxc3 Nc6 5.Nf3 d6 6.Bc4 e6
• Sicilian Defense: Smith-Morra Gambit Accepted, Paulsen Formation: 1.e4 c5 2.d4 cxd4 3.c3 dxc3 4.Nxc3 Nc6 5.Nf3 e6 6.Bc4 a6
• Sicilian Defense: Smith-Morra Gambit Accepted, Morphy Defense Deferred: 1.e4 c5 2.d4 cxd4 3.c3 dxc3 4.Nxc3 Nc6 5.Nf3 e6 6.Bc4 a6 7.0-0 b5 8.Bb3 Bc5
• Sicilian Defense: Smith-Morra Gambit Accepted, Pin Defense: 1.e4 c5 2.d4 cxd4 3.c3 dxc3 4.Nxc3 Nc6 5.Nf3 e6 6.Bc4 Bb4
• Sicilian Defense: Smith-Morra Gambit Accepted, Morphy Defense: 1.e4 c5 2.d4 cxd4 3.c3 dxc3 4.Nxc3 Nc6 5.Nf3 e6 6.Bc4 Bc5
• Sicilian Defense: Smith-Morra Gambit Accepted, Siberian Variation: 1.e4 c5 2.d4 cxd4 3.c3 dxc3 4.Nxc3 Nc6 5.Nf3 e6 6.Bc4 Qc7
• Sicilian Defense: Smith-Morra Gambit Accepted, Larsen Defense: 1.e4 c5 2.d4 cxd4 3.c3 dxc3 4.Nxc3 Nc6 5.Nf3 e6 6.Bc4 Qc7 7.Qe2 a6 8.0-0 Bd6
• Sicilian Defense: Smith-Morra Gambit Accepted, Siberian Variation, Siberian Trap: 1.e4 c5 2.d4 cxd4 3.c3 dxc3 4.Nxc3 Nc6 5.Nf3 e6 6.Bc4 Qc7 7.Qe2 Nf6 8.0-0 Ng4
• Sicilian Defense: Smith-Morra Gambit Accepted, Fianchetto Defense: 1.e4 c5 2.d4 cxd4 3.c3 dxc3 4.Nxc3 Nc6 5.Nf3 g6
• Sicilian Defense: Smith-Morra Gambit Declined, Center Formation: 1.e4 c5 2.d4 cxd4 3.c3 e5
• Sicilian Defense: Smith-Morra Gambit Declined, Alapin Formation: 1.e4 c5 2.d4 cxd4 3.c3 Nf6
• Sicilian Defense: Smith-Morra Gambit Declined, Wing Formation: 1.e4 c5 2.d4 cxd4 3.c3 Qa5
• Sicilian Defense: Halasz Gambit: 1.e4 c5 2.d4 cxd4 3.f4
• Sicilian Defense: Morphy Gambit: 1.e4 c5 2.d4 cxd4 3.Nf3
• Sicilian Defense: Morphy Gambit, Andreaschek Gambit: 1.e4 c5 2.d4 cxd4 3.Nf3 e5 4.c3
• Sicilian Defense: Coles Sicilian Gambit: 1.e4 c5 2.d4 cxd4 3.Qxd4 Nc6 4.Qd1 Nf6 5.Bc4
• Sicilian Defense: McDonnell Attack: 1.e4 c5 2.f4
• Sicilian Defense: McDonnell Attack, Tal Gambit: 1.e4 c5 2.f4 d5 3.exd5 Nf6
• Bird Opening: Dutch Variation, Batavo Gambit: 1.e4 c5 2.f4 d5 3.Nf3 dxe4

• B22 Sicilian, Alapin Variation, 2.c3 (without 2...d6 3.Nf3 (C50), 2...e6 3.Nf3 d5 (B40), 2...e6 3.d4 d5 4.e5 (C02), 2...g6 3.Nf3 (B27))
• Sicilian Defense: Alapin Variation: 1.e4 c5 2.c3
• Sicilian Defense: Alapin Variation, Barmen Defense: 1.e4 c5 2.c3 d5 3.exd5 Qxd5
• Sicilian Defense: Alapin Variation, Barmen Defense, Central Exchange: 1.e4 c5 2.c3 d5 3.exd5 Qxd5 4.d4 cxd4 5.cxd4 Nc6 6.Nf3 Bg4
• Sicilian Defense: Alapin Variation, Barmen Defense, Endgame Variation: 1.e4 c5 2.c3 d5 3.exd5 Qxd5 4.d4 cxd4 5.cxd4 Nc6 6.Nf3 Bg4 7.Nc3 Bxf3 8.gxf3 Qxd4 9.Qxd4 Nxd4
• Sicilian Defense: Alapin Variation, Barmen Defense, Milner-Barry Attack: 1.e4 c5 2.c3 d5 3.exd5 Qxd5 4.d4 Nc6 5.Nf3 cxd4 6.cxd4 e5 7.Nc3 Bb4 8.Be2
• Sicilian Defense: Alapin Variation, Barmen Defense, Modern Line: 1.e4 c5 2.c3 d5 3.exd5 Qxd5 4.d4 Nf6 5.Nf3 Bg4
• Sicilian Defense: Alapin Variation, Smith-Morra Declined: 1.e4 c5 2.c3 Nf6 3.e5 Nd5 4.d4 cxd4
• Sicilian Defense: Alapin Variation, Stoltz Attack: 1.e4 c5 2.c3 Nf6 3.e5 Nd5 4.Nf3 Nc6 5.Bc4 Nb6 6.Bb3
• Sicilian Defense: Alapin Variation, Stoltz Attack, Ivanchuk Line: 1.e4 c5 2.c3 Nf6 3.e5 Nd5 4.Nf3 Nc6 5.Bc4 Nb6 6.Bb3 c4 7.Bc2 Qc7 8.Qe2 g5
• Sicilian Defense: Heidenfeld Variation: 1.e4 c5 2.c3 Nf6 3.e5 Nd5 4.Nf3 Nc6 5.Na3

• B23 Sicilian, Closed, 2.Nc3 (without 2...a6 3.Nf3 (B28), 2...d6 3.Nf3 (B50), 2...Nc6 3.g3 (B24–B26))
• Sicilian Defense: Closed: 1.e4 c5 2.Nc3
• Sicilian Defense: Closed: 1.e4 c5 2.Nc3 e6
• Sicilian Defense: Closed: 1.e4 c5 2.Nc3 e6 3.g3
• Sicilian Defense: Closed, Korchnoi Defense: 1.e4 c5 2.Nc3 e6 3.g3 d5
• Sicilian Defense: Closed, Traditional: 1.e4 c5 2.Nc3 Nc6
• Sicilian Defense: Grand Prix Attack: 1.e4 c5 2.Nc3 Nc6 3.f4
• Sicilian Defense: Grand Prix Attack, Schofman Variation: 1.e4 c5 2.Nc3 Nc6 3.f4 g6 4.Nf3 Bg7 5.Bc4 e6 6.f5
• Sicilian Defense: Closed, Grob Attack: 1.e4 c5 2.Nc3 Nc6 3.g4
• Sicilian Defense: Closed, Chameleon Variation: 1.e4 c5 2.Nc3 Nc6 3.Nge2

• B24 Sicilian, Closed, 2.Nc3 Nc6 3.g3 (without 3...g6 (B25–B26))
• Sicilian Defense: Closed, Fianchetto Variation: 1.e4 c5 2.Nc3 Nc6 3.g3
• Sicilian Defense: Closed: 1.e4 c5 2.Nc3 Nc6 3.g3 g6
• Sicilian Defense: Closed: 1.e4 c5 2.Nc3 Nc6 3.g3 g6 4.Bg2 Bg7
• Sicilian Defense: Closed, Smyslov Variation: 1.e4 c5 2.Nc3 Nc6 3.g3 g6 4.Bg2 Bg7 5.d3 e6 6.Be3 Nd4 7.Nce2

• B25 Sicilian, Closed, 2.Nc3 Nc6 3.g3 g6 4.Bg2 Bg7 5.d3 d6 (without 6.Be3 (B26))
• Sicilian Defense: Closed: 1.e4 c5 2.Nc3 Nc6 3.g3 g6 4.Bg2 Bg7 5.d3 d6
• Sicilian Defense: Closed: 1.e4 c5 2.Nc3 Nc6 3.g3 g6 4.Bg2 Bg7 5.d3 d6 6.f4
• Sicilian Defense: Closed, Botvinnik Defense, with f4: 1.e4 c5 2.Nc3 Nc6 3.g3 g6 4.Bg2 Bg7 5.d3 d6 6.f4 e5
• Sicilian Defense: Closed, Botvinnik Defense, Edge Variation: 1.e4 c5 2.Nc3 Nc6 3.g3 g6 4.Bg2 Bg7 5.d3 d6 6.f4 e5 7.Nh3 Nge7
• Sicilian Defense: Closed, Botvinnik Defense, with Nge2: 1.e4 c5 2.Nc3 Nc6 3.g3 g6 4.Bg2 Bg7 5.d3 d6 6.Nge2 e5

• B26 Sicilian, Closed, 6.Be3
• Sicilian Defense: Closed: 1.e4 c5 2.Nc3 Nc6 3.g3 g6 4.Bg2 Bg7 5.d3 d6 6.Be3

• B27 Sicilian Defence, 2.Nf3 (without 2...a6 (B28), 2...Nc6 (B30), 2...d6 (B50), 2...e6 (B40), 2...Nf6 (B29))
• Sicilian Defense: 1.e4 c5 2.Nf3
• Sicilian Defense: Polish Gambit: 1.e4 c5 2.Nf3 b5
• Sicilian Defense: Katalimov Variation: 1.e4 c5 2.Nf3 b6
• Sicilian Defense: Jalalabad Variation: 1.e4 c5 2.Nf3 e5
• Sicilian Defense: Brussels Gambit: 1.e4 c5 2.Nf3 f5
• Sicilian Defense: Double-Dutch Gambit: 1.e4 c5 2.Nf3 f5 3.exf5 Nh6
• Sicilian Defense: Hyperaccelerated Dragon: 1.e4 c5 2.Nf3 g6
• Pterodactyl Defense: Western, Pterodactyl: 1.e4 c5 2.Nf3 g6 3.c3 Bg7 4.d4 Qa5
• Sicilian Defense: Acton Extension: 1.e4 c5 2.Nf3 g6 3.c4 Bh6
• Sicilian Defense: Hyperaccelerated Fianchetto: 1.e4 c5 2.Nf3 g6 3.d4
• Sicilian Defense: Hyperaccelerated Pterodactyl: 1.e4 c5 2.Nf3 g6 3.d4 Bg7
• Pterodactyl Defense: Western, Rhamphorhynchus: 1.e4 c5 2.Nf3 g6 3.d4 Bg7 4.dxc5 Qa5+
• Pterodactyl Defense: Sicilian, Rhamphorhynchus: 1.e4 c5 2.Nf3 g6 3.d4 Bg7 4.dxc5 Qa5+ 5.Nc3
• Pterodactyl Defense: Sicilian, Pteranodon: 1.e4 c5 2.Nf3 g6 3.d4 Bg7 4.dxc5 Qa5+ 5.Nc3 Bxc3+ 6.bxc3
• Sicilian Defense: Hyperaccelerated Pterodactyl, Exchange Variation: 1.e4 c5 2.Nf3 g6 3.d4 Bg7 4.dxc5 Qa5+ 5.Nc3 Bxc3+ 6.bxc3 Qxc3+
• Modern Defense: Pterodactyl Variation: 1.e4 c5 2.Nf3 g6 3.d4 Bg7 4.Nc3 Qa5
• Pterodactyl Defense: Sicilian, Unpin: 1.e4 c5 2.Nf3 g6 3.d4 Bg7 4.Nc3 Qa5 5.Bd2
• Pterodactyl Defense: Sicilian, Anhanguera: 1.e4 c5 2.Nf3 g6 3.d4 Bg7 4.Nc3 Qa5 5.Be3
• Pterodactyl Defense: Sicilian, Benoni Gambit: 1.e4 c5 2.Nf3 g6 3.d4 Bg7 4.Nc3 Qa5 5.d5
• Sicilian Defense: Frederico Variation: 1.e4 c5 2.Nf3 g6 3.d4 f5
• Sicilian Defense: Bücker Variation: 1.e4 c5 2.Nf3 h6
• Sicilian Defense: Mongoose Variation: 1.e4 c5 2.Nf3 Qa5
• Sicilian Defense: Quinteros Variation: 1.e4 c5 2.Nf3 Qc7

• B28 Sicilian, O'Kelly Variation, 2.Nf3 a6 (without 3.d4 cxd4 4.Nxd4 e6 (B41, B43))
• Sicilian Defense: O'Kelly Variation: 1.e4 c5 2.Nf3 a6
• Sicilian Defense: O'Kelly Variation, Kieseritzky System: 1.e4 c5 2.Nf3 a6 3.b3
• Sicilian Defense: O'Kelly Variation, Wing Gambit: 1.e4 c5 2.Nf3 a6 3.b4
• Sicilian Defense: O'Kelly Variation, Aronin System: 1.e4 c5 2.Nf3 a6 3.Be2
• Sicilian Defense: O'Kelly Variation, Venice System: 1.e4 c5 2.Nf3 a6 3.c3
• Sicilian Defense: O'Kelly Variation, Venice System, Ljubojevic Line: 1.e4 c5 2.Nf3 a6 3.c3 b5
• Sicilian Defense: O'Kelly Variation, Venice System, Gambit Line: 1.e4 c5 2.Nf3 a6 3.c3 d5 4.exd5 Nf6
• Sicilian Defense: O'Kelly Variation, Venice System, Steiner Line: 1.e4 c5 2.Nf3 a6 3.c3 d6
• Sicilian Defense: O'Kelly Variation, Venice System, Barcza Line: 1.e4 c5 2.Nf3 a6 3.c3 Nf6
• Sicilian Defense: O'Kelly Variation, Maróczy Bind: 1.e4 c5 2.Nf3 a6 3.c4
• Sicilian Defense: O'Kelly Variation, Maróczy Bind, Robatsch Line: 1.e4 c5 2.Nf3 a6 3.c4 d6
• Sicilian Defense: O'Kelly Variation, Maróczy Bind, Paulsen Line: 1.e4 c5 2.Nf3 a6 3.c4 e6
• Sicilian Defense: O'Kelly Variation, Quiet System: 1.e4 c5 2.Nf3 a6 3.d3
• Sicilian Defense: O'Kelly Variation, Normal System: 1.e4 c5 2.Nf3 a6 3.d4
• Sicilian Defense: O'Kelly Variation, Normal System, Cortlever Gambit: 1.e4 c5 2.Nf3 a6 3.d4 cxd4 4.Bc4
• Sicilian Defense: O'Kelly Variation, Normal System, Smith-Morra Line: 1.e4 c5 2.Nf3 a6 3.d4 cxd4 4.c3
• Sicilian Defense: O'Kelly Variation, Normal System, Taimanov Line: 1.e4 c5 2.Nf3 a6 3.d4 cxd4 4.Nxd4 e5
• Sicilian Defense: O'Kelly Variation, Normal System, Zagorovsky Line: 1.e4 c5 2.Nf3 a6 3.d4 cxd4 4.Qxd4
• Sicilian Defense: O'Kelly Variation, Réti System: 1.e4 c5 2.Nf3 a6 3.g3
• Sicilian Defense: O'Kelly Variation, Yerevan System: 1.e4 c5 2.Nf3 a6 3.Nc3

• B29 Sicilian, Nimzovich–Rubinstein Variation, 2.Nf3 Nf6 (without 3.e5 Nd5 4.c3 (B22), 3.Nc3 Nc6 (B30), 3.Nc3 d6 (B50), 3.d4 cxd4 4.Nxd4 d6 (B54, B56, B94–B99))
• Sicilian Defense: Nimzowitsch Variation: 1.e4 c5 2.Nf3 Nf6
• Sicilian Defense: Nimzowitsch Variation, Advance Variation: 1.e4 c5 2.Nf3 Nf6 3.e5
• Sicilian Defense: Nimzowitsch Variation, Main Line: 1.e4 c5 2.Nf3 Nf6 3.e5 Nd5 4.Nc3 e6 5.Nxd5 exd5 6.d4 Nc6
• Sicilian Defense: Nimzowitsch Variation, Exchange Variation: 1.e4 c5 2.Nf3 Nf6 3.e5 Nd5 4.Nc3 Nxc3
• Sicilian Defense: Nimzowitsch Variation, Closed Variation: 1.e4 c5 2.Nf3 Nf6 3.Nc3

• B30 Sicilian Defence, 2.Nf3 Nc6 (without 3.Bb5 g6 (B31) 3.Bb5 d6 (B51))
  • Sicilian, Rossolimo Variation, 3.Bb5
• Sicilian Defense: Old Sicilian: 1.e4 c5 2.Nf3 Nc6
• Sicilian Defense: Portsmouth Gambit: 1.e4 c5 2.Nf3 Nc6 3.b4
• Sicilian Defense: Nyezhmetdinov-Rossolimo Attack: 1.e4 c5 2.Nf3 Nc6 3.Bb5
• Sicilian Defense: Nyezhmetdinov-Rossolimo Attack, San Francisco Gambit: 1.e4 c5 2.Nf3 Nc6 3.Bb5 Na5 4.b4
• Sicilian Defense: Rossolimo Variation, Brooklyn Retreat Defense: 1.e4 c5 2.Nf3 Nc6 3.Bb5 Nb8
• Sicilian Defense: Closed, Anti-Sveshnikov Variation, with d6: 1.e4 c5 2.Nf3 Nc6 3.Nc3 e5 4.Bc4 Be7 5.d3 d6
• Sicilian Defense: Closed, Anti-Sveshnikov Variation, Kharlov-Kramnik Line: 1.e4 c5 2.Nf3 Nc6 3.Nc3 e5 4.Bc4 Be7 5.d3 d6 6.Nd2 Bg5
• Sicilian Defense: Closed, Anti-Sveshnikov Variation, with Nf6: 1.e4 c5 2.Nf3 Nc6 3.Nc3 e5 4.Bc4 Be7 5.d3 Nf6

• B31 Sicilian, Nimzovich–Rossolimo Attack, 3.Bb5 g6
• Sicilian Defense: Nyezhmetdinov-Rossolimo Attack, Fianchetto Variation: 1.e4 c5 2.Nf3 Nc6 3.Bb5 g6
• Sicilian Defense: Nyezhmetdinov-Rossolimo Attack, Fianchetto Variation, Gufeld Gambit: 1.e4 c5 2.Nf3 Nc6 3.Bb5 g6 4.0-0 Bg7 5.c3 e5 6.d4
• Sicilian Defense: Nyezhmetdinov-Rossolimo Attack, Fianchetto Variation, Lutikov Gambit: 1.e4 c5 2.Nf3 Nc6 3.Bb5 g6 4.0-0 Bg7 5.c3 Nf6 6.d4
• Sicilian Defense: Nyezhmetdinov-Rossolimo Attack, Fianchetto Variation, Totsky Attack: 1.e4 c5 2.Nf3 Nc6 3.Bb5 g6 4.0-0 Bg7 5.c3 Nf6 6.Qa4
• Sicilian Defense: Nyezhmetdinov-Rossolimo Attack, Gurgenidze Variation: 1.e4 c5 2.Nf3 Nc6 3.Bb5 g6 4.0-0 Bg7 5.Re1 e5 6.b4

• B32 Sicilian Defence, 2.Nf3 Nc6 3.d4 (without 3...cxd4 4.Nxd4 Nf6 (B33), 4...e6 (B44–B47) 4...g6 (B34))
• Sicilian Defense: Open: 1.e4 c5 2.Nf3 Nc6 3.d4
• Sicilian Defense: Open: 1.e4 c5 2.Nf3 Nc6 3.d4 cxd4
• Sicilian Defense: Open: 1.e4 c5 2.Nf3 Nc6 3.d4 cxd4 4.Nxd4
• Sicilian Defense: O'Kelly Variation, Maróczy Bind, Geller Line: 1.e4 c5 2.Nf3 Nc6 3.d4 cxd4 4.Nxd4 a6 5.c4 e5
• Sicilian Defense: Nimzo-American Variation: 1.e4 c5 2.Nf3 Nc6 3.d4 cxd4 4.Nxd4 d5
• Sicilian Defense: Löwenthal Variation: 1.e4 c5 2.Nf3 Nc6 3.d4 cxd4 4.Nxd4 e5
• Sicilian Defense: Kalashnikov Variation: 1.e4 c5 2.Nf3 Nc6 3.d4 cxd4 4.Nxd4 e5 5.Nb5 d6
• Sicilian Defense: Accelerated Dragon: 1.e4 c5 2.Nf3 Nc6 3.d4 cxd4 4.Nxd4 g6
• Sicilian Defense: Godiva Variation: 1.e4 c5 2.Nf3 Nc6 3.d4 cxd4 4.Nxd4 Qb6
• Sicilian Defense: Flohr Variation: 1.e4 c5 2.Nf3 Nc6 3.d4 cxd4 4.Nxd4 Qc7
• Sicilian Defense: Franco-Sicilian Variation: 1.e4 c5 2.Nf3 Nc6 3.d4 e6

• B33 Sicilian, Sveshnikov (Lasker–Pelikan) Variation, 2.Nf3 Nc6 3.d4 cxd4 4.Nxd4 Nf6 (without 5.Nc3 e6 (B45) 5...g6 (B34) 5...d6 (B56))
• Sicilian Defense: Open: 1.e4 c5 2.Nf3 Nc6 3.d4 cxd4 4.Nxd4 Nf6
• Sicilian Defense: Lasker-Pelikan Variation: 1.e4 c5 2.Nf3 Nc6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 e5
• Sicilian Defense: Lasker-Pelikan Variation, Schlechter Variation: 1.e4 c5 2.Nf3 Nc6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 e5 6.Nb3
• Sicilian Defense: Lasker-Pelikan Variation, Sveshnikov Variation: 1.e4 c5 2.Nf3 Nc6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 e5 6.Ndb5 d6 7.Bg5 a6 8.Na3 b5
• Sicilian Defense: Lasker-Pelikan Variation, Sveshnikov Variation, Novosibirsk Variation: 1.e4 c5 2.Nf3 Nc6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 e5 6.Ndb5 d6 7.Bg5 a6 8.Na3 b5 9.Bxf6 gxf6 10.Nd5 Bg7
• Sicilian Defense: Lasker-Pelikan Variation, Sveshnikov Variation: 1.e4 c5 2.Nf3 Nc6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 e5 6.Ndb5 d6 7.Bg5 a6 8.Na3 b5 9.Bxf6 gxf6 10.Nd5 f5
• Sicilian Defense: Lasker-Pelikan Variation, Sveshnikov Variation, Peresypkin's Sacrifice: 1.e4 c5 2.Nf3 Nc6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 e5 6.Ndb5 d6 7.Bg5 a6 8.Na3 b5 9.Bxf6 gxf6 10.Nd5 f5 11.Bxb5
• Sicilian Defense: Lasker-Pelikan Variation, Sveshnikov Variation, Chelyabinsk Variation: 1.e4 c5 2.Nf3 Nc6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 e5 6.Ndb5 d6 7.Bg5 a6 8.Na3 b5 9.Nd5
• Sicilian Defense: Lasker-Pelikan Variation, Bird Variation: 1.e4 c5 2.Nf3 Nc6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 e5 6.Ndb5 d6 7.Bg5 a6 8.Na3 Be6
• Sicilian Defense: Lasker-Pelikan Variation, Retreat Variation: 1.e4 c5 2.Nf3 Nc6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 e5 6.Nf3
• Sicilian Defense: Lasker-Pelikan Variation, Exchange Variation: 1.e4 c5 2.Nf3 Nc6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 e5 6.Nxc6
• Sicilian Defense: Four Knights Variation, Cobra Variation: 1.e4 c5 2.Nf3 Nc6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 e6 6.Ndb5 Bc5

• B34 Sicilian, Accelerated Fianchetto, Exchange Variation, 2.Nf3 Nc6 3 d4.cxd4 4.Nxd4 g6 (without 5.c4 (B36), 5.Nc3 Bg7 6.Be3 Nf6 7.Bc4 (B35))
• Sicilian Defense: Accelerated Dragon, Modern Variation: 1.e4 c5 2.Nf3 Nc6 3.d4 cxd4 4.Nxd4 g6 5.Nc3
• Sicilian Defense: Accelerated Dragon, Exchange Variation: 1.e4 c5 2.Nf3 Nc6 3.d4 cxd4 4.Nxd4 g6 5.Nxc6

• B35 Sicilian, Accelerated Fianchetto, Modern Variation with 2.Nf3 Nc6 3.d4 cxd4 4.Nxd4 g6 5.Nc3 Bg7 6.Be3 Nf6 7.Bc4 (without 7...b6 (B72, B75))
• Sicilian Defense: Accelerated Dragon, Modern Bc4 Variation: 1.e4 c5 2.Nf3 Nc6 3.d4 cxd4 4.Nxd4 g6 5.Nc3 Bg7 6.Be3 Nf6 7.Bc4
• Sicilian Defense: Dragon Variation, Modern Bc4 Variation: 1.e4 c5 2.Nf3 Nc6 3.d4 cxd4 4.Nxd4 g6 5.Nc3 Bg7 6.Be3 Nf6 7.Bc4 d6

• B36 Sicilian, Accelerated Fianchetto, Maróczy Bind 2.Nf3 Nc6 3.d4 cxd4 4.Nxd4 g6 5.c4 (without 5...Bg7 (B37–B39))
• Sicilian Defense: Accelerated Dragon, Maróczy Bind: 1.e4 c5 2.Nf3 Nc6 3.d4 cxd4 4.Nxd4 g6 5.c4
• Sicilian Defense: Accelerated Dragon, Maróczy Bind, Gurgenidze Variation: 1.e4 c5 2.Nf3 Nc6 3.d4 cxd4 4.Nxd4 g6 5.c4 Nf6 6.Nc3 Nxd4 7.Qxd4 d6

• B37 Sicilian, Accelerated Fianchetto, Maróczy Bind, 5...Bg7 (without 6.Be3 (B38))
• Sicilian Defense: Accelerated Dragon, Maróczy Bind: 1.e4 c5 2.Nf3 Nc6 3.d4 cxd4 4.Nxd4 g6 5.c4 Bg7
• Sicilian Defense: Accelerated Dragon, Simagin Variation: 1.e4 c5 2.Nf3 Nc6 3.d4 cxd4 4.Nxd4 g6 5.c4 Bg7 6.Nc2 d6 7.Be2 Nh6

• B38 Sicilian, Accelerated Fianchetto, Maróczy Bind, 5...Bg7 6.Be3 (without 6...Nf6 7.Nc3 Ng4 (B39))
• Sicilian Defense: Accelerated Dragon, Maróczy Bind: 1.e4 c5 2.Nf3 Nc6 3.d4 cxd4 4.Nxd4 g6 5.c4 Bg7 6.Be3

• B39 Sicilian, Accelerated Fianchetto, Breyer Variation, 5...Bg7 6.Be3 Nf6 7.Nc3 Ng4
• Sicilian Defense: Accelerated Dragon, Maróczy Bind, Breyer Variation: 1.e4 c5 2.Nf3 Nc6 3.d4 cxd4 4.Nxd4 g6 5.c4 Bg7 6.Be3 Nf6 7.Nc3 Ng4

• B40 Sicilian Defence, 2.Nf3 e6
• Sicilian Defense: French Variation: 1.e4 c5 2.Nf3 e6
• Sicilian Defense: French Variation, Westerinen Attack: 1.e4 c5 2.Nf3 e6 3.b3
• Sicilian Defense: Wing Gambit Deferred: 1.e4 c5 2.Nf3 e6 3.b4
• Sicilian Defense: Delayed Alapin Variation, with e6: 1.e4 c5 2.Nf3 e6 3.c3
• Sicilian Defense: Alapin Variation, Sherzer Variation: 1.e4 c5 2.Nf3 e6 3.c3 Nf6 4.e5 Nd5 5.d4 Nc6
• Sicilian Defense: Kramnik Variation: 1.e4 c5 2.Nf3 e6 3.c4
• Sicilian Defense: Drazic Variation: 1.e4 c5 2.Nf3 e6 3.d4 a6
• Sicilian Defense: French Variation, Open: 1.e4 c5 2.Nf3 e6 3.d4 cxd4
• Sicilian Defense: Smith-Morra Gambit Deferred: 1.e4 c5 2.Nf3 e6 3.d4 cxd4 4.c3
• Sicilian Defense: Paulsen-Basman Defense: 1.e4 c5 2.Nf3 e6 3.d4 cxd4 4.Nxd4 Bc5
• Sicilian Defense: French Variation, Normal: 1.e4 c5 2.Nf3 e6 3.d4 cxd4 4.Nxd4 Nf6
• Sicilian Defense: Pin Variation: 1.e4 c5 2.Nf3 e6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 Bb4
• Sicilian Defense: Pin Variation, Jaffe Variation: 1.e4 c5 2.Nf3 e6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 Bb4 6.Bd3 e5
• Sicilian Defense: Pin Variation, Koch Variation: 1.e4 c5 2.Nf3 e6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 Bb4 6.e5
• Sicilian Defense: Four Knights Variation: 1.e4 c5 2.Nf3 e6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 Nc6
• Sicilian Defense: Four Knights Variation, Exchange Variation: 1.e4 c5 2.Nf3 e6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 Nc6 6.Nxc6
• Sicilian Defense: Gaw-Paw Variation: 1.e4 c5 2.Nf3 e6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 Qb6
• Sicilian Defense: Kveinis Variation: 1.e4 c5 2.Nf3 e6 3.d4 cxd4 4.Nxd4 Qb6
• Sicilian Defense: Marshall Counterattack: 1.e4 c5 2.Nf3 e6 3.d4 d5
• Sicilian Defense: Kan Variation, Wing Attack, Fianchetto Variation: 1.e4 c5 2.Nf3 e6 3.Nc3 a6 4.g3 b5 5.d4 cxd4 6.Nxd4

• B41 Sicilian, Kan Variation, 2.Nf3 e6 3.d4 cxd4 4.Nxd4 a6 (without 5.Bd3 (B42), 5.Nc3 (B43), 5.Be2 Nf6 6.Nc3 Qc7 (B43))
• Sicilian Defense: Kan Variation: 1.e4 c5 2.Nf3 e6 3.d4 cxd4 4.Nxd4 a6
• Sicilian Defense: Kan Variation, Maróczy Bind, Réti Variation: 1.e4 c5 2.Nf3 e6 3.d4 cxd4 4.Nxd4 a6 5.c4
• Sicilian Defense: Kan Variation, Maróczy Bind, Hedgehog Variation: 1.e4 c5 2.Nf3 e6 3.d4 cxd4 4.Nxd4 a6 5.c4 g6
• Sicilian Defense: Kan Variation, Maróczy Bind, Bronstein Variation: 1.e4 c5 2.Nf3 e6 3.d4 cxd4 4.Nxd4 a6 5.c4 Nf6 6.Nc3 Bb4 7.Bd3 Nc6
• Sicilian Defense: Kan Variation, Maróczy Bind, Bronstein Variation: 1.e4 c5 2.Nf3 e6 3.d4 cxd4 4.Nxd4 a6 5.c4 Nf6 6.Nc3 Bb4 7.Bd3 Nc6 8.Bc2

• B42 Sicilian, Kan, 5.Bd3
• Sicilian Defense: Kan Variation, Modern Variation: 1.e4 c5 2.Nf3 e6 3.d4 cxd4 4.Nxd4 a6 5.Bd3
• Sicilian Defense: Kan Variation, Polugaevsky Variation: 1.e4 c5 2.Nf3 e6 3.d4 cxd4 4.Nxd4 a6 5.Bd3 Bc5
• Sicilian Defense: Kan Variation, Swiss Cheese Variation: 1.e4 c5 2.Nf3 e6 3.d4 cxd4 4.Nxd4 a6 5.Bd3 g6
• Sicilian Defense: Kan Variation, Gipslis Variation: 1.e4 c5 2.Nf3 e6 3.d4 cxd4 4.Nxd4 a6 5.Bd3 Nf6 6.0-0 d6 7.c4 g6

• B43 Sicilian, Kan, 5.Nc3
• Sicilian Defense: Kan Variation, Knight Variation: 1.e4 c5 2.Nf3 e6 3.d4 cxd4 4.Nxd4 a6 5.Nc3
• Sicilian Defense: Kan Variation, Wing Attack: 1.e4 c5 2.Nf3 e6 3.d4 cxd4 4.Nxd4 a6 5.Nc3 b5
• Sicilian Defense: Kan Variation, Wing Attack, Christiansen's Dream: 1.e4 c5 2.Nf3 e6 3.d4 cxd4 4.Nxd4 a6 5.Nc3 b5 6.Bd3 Qb6 7.Be3 Bc5 8.Qg4
• Sicilian Defense: Kan Variation, Wing Attack, Spraggett Attack: 1.e4 c5 2.Nf3 e6 3.d4 cxd4 4.Nxd4 a6 5.Nc3 b5 6.Bd3 Qb6 7.Nf3

• B44 Sicilian Defence, 2.Nf3 e6 3.d4 cxd4 4.Nxd4 Nc6
• Sicilian Defense: Taimanov Variation: 1.e4 c5 2.Nf3 e6 3.d4 cxd4 4.Nxd4 Nc6
• Sicilian Defense: Taimanov Variation, Szén Variation: 1.e4 c5 2.Nf3 e6 3.d4 cxd4 4.Nxd4 Nc6 5.Nb5
• Sicilian Defense: Taimanov Variation, Modern Line: 1.e4 c5 2.Nf3 e6 3.d4 cxd4 4.Nxd4 Nc6 5.Nb5 d6 6.c4 Nf6 7.N1c3 a6 8.Na3 Be7 9.Be2 0-0 10.0-0 b6
• Sicilian Defense: Taimanov Variation, Gary Gambit: 1.e4 c5 2.Nf3 e6 3.d4 cxd4 4.Nxd4 Nc6 5.Nb5 d6 6.c4 Nf6 7.N1c3 a6 8.Na3 d5

• B45 Sicilian, Taimanov Variation, 5.Nc3
• Sicilian Defense: Taimanov Variation, Normal Variation: 1.e4 c5 2.Nf3 e6 3.d4 cxd4 4.Nxd4 Nc6 5.Nc3
• Sicilian Defense: Taimanov Variation, American Attack: 1.e4 c5 2.Nf3 e6 3.d4 cxd4 4.Nxd4 Nc6 5.Nc3 Nf6 6.Ndb5 Bb4 7.Nd6+

• B46 Sicilian, Taimanov Variation
• Sicilian Defense: Taimanov Variation: 1.e4 c5 2.Nf3 e6 3.d4 cxd4 4.Nxd4 Nc6 5.Nc3 a6

• B47 Sicilian, Taimanov (Bastrikov) Variation
• Sicilian Defense: Taimanov Variation, Bastrikov Variation: 1.e4 c5 2.Nf3 e6 3.d4 cxd4 4.Nxd4 Nc6 5.Nc3 Qc7
• Sicilian Defense: Taimanov Variation, Bastrikov Variation, Ponomariov Gambit: 1.e4 c5 2.Nf3 e6 3.d4 cxd4 4.Nxd4 Nc6 5.Nc3 Qc7 6.Ndb5 Qb8 7.Be3 a6 8.Bb6

• B48 Sicilian, Taimanov Variation
• Sicilian Defense: Taimanov Variation, Bastrikov Variation, English Attack: 1.e4 c5 2.Nf3 e6 3.d4 cxd4 4.Nxd4 Nc6 5.Nc3 Qc7 6.Be3

• B49 Sicilian, Taimanov Variation
• Sicilian Defense: Taimanov Variation, Bastrikov Variation: 1.e4 c5 2.Nf3 e6 3.d4 cxd4 4.Nxd4 Nc6 5.Nc3 Qc7 6.Be3 a6 7.Be2

• B50 Sicilian Defence
• Sicilian Defense: Modern Variations: 1.e4 c5 2.Nf3 d6
• Sicilian Defense: Wing Gambit, Deferred Variation: 1.e4 c5 2.Nf3 d6 3.b4
• Sicilian Defense: Kopec System: 1.e4 c5 2.Nf3 d6 3.Bd3
• Sicilian Defense: Delayed Alapin Variation, with d6: 1.e4 c5 2.Nf3 d6 3.c3
• Sicilian Defense: Delayed Alapin Variation, Basman-Palatnik Gambit: 1.e4 c5 2.Nf3 d6 3.c3 Nf6 4.Be2 Nc6 5.d4 cxd4 6.cxd4 Nxe4
• Sicilian Defense: Delayed Alapin Variation, Basman-Palatnik Double Gambit: 1.e4 c5 2.Nf3 d6 3.c3 Nf6 4.Be2 Nc6 5.d4 cxd4 6.cxd4 Nxe4 7.d5 Qa5+ 8.Nc3 Nxc3 9.bxc3
• Sicilian Defense: 1.e4 c5 2.Nf3 d6 3.d4
• Sicilian Defense: 1.e4 c5 2.Nf3 d6 3.d4 cxd4
• Sicilian Defense: Modern Variations, Tartakower: 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.c3
• Sicilian Defense: Modern Variations, Anti-Qxd4 Move Order: 1.e4 c5 2.Nf3 d6 3.d4 Nf6
• Sicilian Defense: Modern Variations, Anti-Qxd4 Move Order Accepted: 1.e4 c5 2.Nf3 d6 3.d4 Nf6 4.dxc5 Nxe4
• Sicilian Defense: Kotov Gambit: 1.e4 c5 2.Nf3 d6 3.g3 b5

• B51 Sicilian, Canal–Sokolsky Attack
• Sicilian Defense: Moscow Variation: 1.e4 c5 2.Nf3 d6 3.Bb5+
• Sicilian Defense: Moscow Variation, Moscow Gambit: 1.e4 c5 2.Nf3 d6 3.Bb5+ Nc6 4.0-0 Bd7 5.c3 Nf6 6.Re1 a6 7.Bxc6 Bxc6 8.d4 Bxe4 9.Bg5
• Sicilian Defense: Moscow Variation, Dorfman Gambit: 1.e4 c5 2.Nf3 d6 3.Bb5+ Nc6 4.0-0 Bd7 5.Qe2 g6 6.e5

• B52 Sicilian, Canal–Sokolsky Attack, 3...Bd7
• Sicilian Defense: Moscow Variation, Main Line: 1.e4 c5 2.Nf3 d6 3.Bb5+ Bd7
• Sicilian Defense: Moscow Variation, Sokolsky Variation: 1.e4 c5 2.Nf3 d6 3.Bb5+ Bd7 4.Bxd7+ Qxd7 5.c4
• Sicilian Defense: Moscow Variation, Haag Gambit: 1.e4 c5 2.Nf3 d6 3.Bb5+ Bd7 4.Bxd7+ Qxd7 5.0-0 Nc6 6.c3 Nf6 7.d4

• B53 Sicilian, Chekhover Variation
• Sicilian Defense: Chekhover Variation: 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Qxd4
• Sicilian Defense: Chekhover Variation, Zaitsev Defense: 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Qxd4 Nc6 5.Bb5 Qd7

• B54 Sicilian
• Sicilian Defense: Dragon Variation, Accelerated Dragon: 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 g6
• Sicilian Defense: Modern Variations, Main Line: 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6
• Sicilian Defense: Modern Variations, Ginsberg Gambit: 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Bc4
• Sicilian Defense: Prins Variation: 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.f3

• B55 Sicilian, Prins Variation, Venice Attack
• Sicilian Defense: Prins Variation, Venice Attack: 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.f3 e5 6.Bb5+

• B56 Sicilian
• Sicilian Defense: Kupreichik Variation: 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 Bd7
• Sicilian Defense: Venice Attack: 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 e5 6.Bb5+
• Sicilian Defense: Classical Variation: 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 Nc6
• Sicilian Defense: Classical Variation, Fianchetto Variation: 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 Nc6 6.g3
• Sicilian Defense: Yates Variation: 1.e4 c5 2.Nf3 Nc6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 d6 6.Bd3
• Sicilian Defense: Spielmann Variation: 1.e4 c5 2.Nf3 Nc6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 d6 6.Nde2

• B57 Sicilian, Sozin (not Scheveningen) including Magnus Smith Trap
• Sicilian Defense: Classical Variation, Sozin Attack: 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 Nc6 6.Bc4
• Sicilian Defense: Magnus Smith Trap: 1.e4 c5 2.Nf3 Nc6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 d6 6.Bc4 g6 7.Nxc6 bxc6 8.e5
• Sicilian Defense: Classical Variation, Anti-Sozin Variation: 1.e4 c5 2.Nf3 Nc6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 d6 6.Bc4 Qb6

• B58 Sicilian, Classical
• Sicilian Defense: Classical Variation: 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 Nc6 6.Be2
• Sicilian Defense: Boleslavsky Variation: 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 Nc6 6.Be2 e5
• Sicilian Defense: Classical Variation, Dragon Transfer: 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 Nc6 6.Be2 Nxd4 7.Qxd4 g6
• Sicilian Defense: Boleslavsky Variation, Louma Variation: 1.e4 c5 2.Nf3 Nc6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 d6 6.Be2 e5 7.Nxc6

• B59 Sicilian, Boleslavsky Variation, 7.Nb3
• Sicilian Defense: Boleslavsky Variation: 1.e4 c5 2.Nf3 Nc6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 d6 6.Be2 e5 7.Nb3

• B60 Sicilian, Richter–Rauzer
• Sicilian Defense: Richter-Rauzer Variation: 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 Nc6 6.Bg5
• Sicilian Defense: Richter-Rauzer Variation, Modern Variation: 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 Nc6 6.Bg5 Bd7
• Sicilian Defense: Richter-Rauzer Variation, Dragon Variation: 1.e4 c5 2.Nf3 Nc6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 d6 6.Bg5 g6

• B61 Sicilian, Richter–Rauzer, Larsen Variation, 7.Qd2
• Sicilian Defense: Richter-Rauzer Variation, Modern Variation: 1.e4 c5 2.Nf3 Nc6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 d6 6.Bg5 Bd7 7.Qd2

• B62 Sicilian, Richter–Rauzer, 6...e6
• Sicilian Defense: Richter-Rauzer Variation: 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 Nc6 6.Bg5 e6
• Sicilian Defense: Richter-Rauzer Variation, Vitolins Variation: 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 Nc6 6.Bg5 e6 7.Bb5
• Sicilian Defense: Richter-Rauzer Variation, Exchange Variation: 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 Nc6 6.Bg5 e6 7.Nxc6
• Sicilian Defense: Richter-Rauzer Variation: 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 Nc6 6.Bg5 e6 7.Qd3
• Sicilian Defense: Richter-Rauzer Variation, Podebrady Variation: 1.e4 c5 2.Nf3 Nc6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 d6 6.Bg5 e6 7.Nb3

• B63 Sicilian, Richter–Rauzer, Rauzer Attack
• Sicilian Defense: Richter-Rauzer Variation, Traditional Variation: 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 Nc6 6.Bg5 e6 7.Qd2
• Sicilian Defense: Richter-Rauzer Variation, Classical Variation: 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 Nc6 6.Bg5 e6 7.Qd2 Be7
• Sicilian Defense: Richter-Rauzer Variation, Classical Variation, Kantscher Line: 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 Nc6 6.Bg5 e6 7.Qd2 Be7 8.0-0-0 Nxd4 9.Qxd4 a6 10.f4 b5
• Sicilian Defense: Richter-Rauzer Variation, Ivanov Variation: 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 Nc6 6.Bg5 e6 7.Qd2 Qb6

• B64 Sicilian, Richter–Rauzer, Rauzer Attack, 7...Be7 defence, 9.f4
• Sicilian Defense: Richter-Rauzer Variation, Classical Variation: 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 Nc6 6.Bg5 e6 7.Qd2 Be7 8.0-0-0 0-0 9.f4
• Sicilian Defense: Richter-Rauzer Variation, Classical Variation: 1.e4 c5 2.Nf3 Nc6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 d6 6.Bg5 e6 7.Qd2 Be7 8.0-0-0 0-0 9.f4 e5

• B65 Sicilian, Richter–Rauzer, Rauzer Attack, 7...Be7 defence, 9...Nxd4
• Sicilian Defense: Richter-Rauzer Variation, Rauzer Attack: 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 Nc6 6.Bg5 e6 7.Qd2 Be7 8.0-0-0 0-0 9.f4 Nxd4
• Sicilian Defense: Richter-Rauzer Variation, Classical Variation: 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 Nc6 6.Bg5 e6 7.Qd2 Be7 8.0-0-0 0-0 9.f4 Nxd4 10.Qxd4

• B66 Sicilian, Richter–Rauzer, Rauzer Attack, 7...a6
• Sicilian Defense: Richter-Rauzer Variation, Neo-Modern Variation, Early Deviations: 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 Nc6 6.Bg5 e6 7.Qd2 a6

• B67 Sicilian, Richter–Rauzer, Rauzer Attack, 7...a6 defence, 8...Bd7
• Sicilian Defense: Richter-Rauzer Variation, Neo-Modern Variation: 1.e4 c5 2.Nf3 Nc6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 d6 6.Bg5 e6 7.Qd2 a6 8.0-0-0 Bd7

• B68 Sicilian, Richter–Rauzer, Rauzer Attack, 7...a6 defence, 9...Be7
• Sicilian Defense: Richter-Rauzer Variation, Neo-Modern Variation: 1.e4 c5 2.Nf3 Nc6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 d6 6.Bg5 e6 7.Qd2 a6 8.0-0-0 Bd7 9.f4 Be7

• B69 Sicilian, Richter–Rauzer, Rauzer Attack, 7...a6 defence, 11.Bxf6
• Sicilian Defense: Richter-Rauzer Variation, Neo-Modern Variation, Nyezhmetdinov Attack: 1.e4 c5 2.Nf3 Nc6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 d6 6.Bg5 e6 7.Qd2 a6 8.0-0-0 Bd7 9.f4 Be7 10.Nf3 b5 11.Bxf6

• B70 Sicilian, Dragon Variation
• Sicilian Defense: Dragon Variation: 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 g6
• Sicilian Defense: Dragon Variation, Classical Variation: 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 g6 6.Be2
• Sicilian Defense: Dragon Variation, Fianchetto Variation: 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 g6 6.g3

• B71 Sicilian, Dragon, Levenfish Attack
• Sicilian Defense: Dragon Variation, Levenfish Variation: 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 g6 6.f4
• Sicilian Defense: Dragon Variation, Levenfish Variation, Main Line: 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 g6 6.f4 Nbd7

• B72 Sicilian, Dragon, 6.Be3
• Sicilian Defense: Dragon Variation: 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 g6 6.Be3
• Sicilian Defense: Dragon Variation, Classical Variation: 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 g6 6.Be3 Bg7 7.Be2
• Sicilian Defense: Dragon Variation, Classical Variation: 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 g6 6.Be3 Bg7 7.Be2 Nc6
• Sicilian Defense: Dragon Variation, Classical Variation: 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 g6 6.Be3 Bg7 7.Be2 Nc6 8.Nb3
• Sicilian Defense: Dragon Variation, Classical Variation, Amsterdam Variation: 1.e4 c5 2.Nf3 Nc6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 d6 6.Be2 g6 7.Be3 Bg7 8.Qd2
• Sicilian Defense: Dragon Variation, Classical Variation, Grigoriev Variation: 1.e4 c5 2.Nf3 Nc6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 d6 6.Be2 g6 7.Be3 Bg7 8.Qd2 0-0 9.0-0-0

• B73 Sicilian, Dragon, Classical, 8.0-0
• Sicilian Defense: Dragon Variation, Classical Variation: 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 g6 6.Be2 Bg7 7.0-0 Nc6 8.Be3
• Sicilian Defense: Dragon Variation, Classical Variation, Battery Variation: 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 g6 6.Be2 Bg7 7.0-0 0-0 8.Be3 Nc6 9.Qd2
• Sicilian Defense: Dragon Variation, Classical Variation, Zollner Gambit: 1.e4 c5 2.Nf3 Nc6 3.d4 cxd4 4.Nxd4 g6 5.Be3 Bg7 6.Be2 Nf6 7.Nc3 0-0 8.0-0 d6 9.f4 Qb6 10.e5

• B74 Sicilian, Dragon, Classical, 9.Nb3
• Sicilian Defense: Dragon Variation, Classical Variation, Stockholm Attack: 1.e4 c5 2.Nc3 d6 3.f4 Nc6 4.Nf3 g6 5.d4 cxd4 6.Nxd4 Bg7 7.Be3 Nf6 8.Be2 0-0 9.Nb3 Be6 10.0-0 Na5 11.f5 Bc4 12.Nxa5 Bxe2 13.Qxe2 Qxa5 14.g4
• Sicilian Defense: Dragon Variation, Classical Variation, Normal Line: 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 g6 6.Be2 Bg7 7.0-0 0-0 8.Be3 Nc6 9.Nb3
• Sicilian Defense: Dragon Variation, Classical Variation, Maróczy Line: 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 g6 6.Be2 Bg7 7.0-0 0-0 8.Be3 Nc6 9.Nb3 Be6 10.f4 Na5
• Sicilian Defense: Dragon Variation, Classical Variation, Tartakower Line: 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 g6 6.Be2 Bg7 7.0-0 0-0 8.Be3 Nc6 9.Nb3 Be6 10.f4 Qc8
• Sicilian Defense: Dragon Variation, Classical Variation, Bernard Defense: 1.e4 c5 2.Nf3 g6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 d6 6.Be2 Bg7 7.0-0 0-0 8.Be3 Nc6 9.Nb3 Be6 10.f4 Na5 11.f5 Bc4 12.Bd3 Bxd3 13.cxd3 d5
• Sicilian Defense: Dragon Variation, Classical Variation, Spielmann Variation: 1.e4 c5 2.Nf3 Nc6 3.d4 cxd4 4.Nxd4 g6 5.Nc3 Bg7 6.Be3 Nf6 7.Be2 0-0 8.Nb3 d6 9.0-0 Be6 10.f4 Na5 11.f5 Bc4 12.Bd3
• Sicilian Defense: Dragon Variation, Classical Variation, Alekhine Line: 1.e4 c5 2.Nf3 Nc6 3.d4 cxd4 4.Nxd4 g6 5.Nc3 Bg7 6.Be3 Nf6 7.Be2 0-0 8.0-0 d6 9.Nb3 a5

• B75 Sicilian, Dragon, Yugoslav Attack
• Sicilian Defense: Dragon Variation, Yugoslav Attack, Early Deviations: 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 g6 6.Be3 Bg7 7.f3
• Sicilian Defense: Dragon Variation, Yugoslav Attack, Belezky Line: 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 g6 6.Be3 Bg7 7.f3 Nc6

• B76 Sicilian, Dragon, Yugoslav Attack, 7...0-0
• Sicilian Defense: Dragon Variation, Yugoslav Attack, Modern Line: 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 g6 6.Be3 Bg7 7.f3 Nc6 8.Qd2 0-0 9.0-0-0
• Sicilian Defense: Dragon Variation, Yugoslav Attack: 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 g6 6.Be3 Bg7 7.f3 0-0
• Sicilian Defense: Dragon Variation, Yugoslav Attack: 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 g6 6.Be3 Bg7 7.f3 0-0 8.Qd2 Nc6
• Sicilian Defense: Dragon Variation, Yugoslav Attack, Panov Variation: 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 g6 6.Be3 Bg7 7.f3 0-0 8.Qd2 Nc6 9.g4

• B77 Sicilian, Dragon, Yugoslav Attack, 9.Bc4
• Sicilian Defense: Dragon Variation, Yugoslav Attack, Sosonko Variation: 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 g6 6.Be3 Bg7 7.f3 Nc6 8.Qd2 0-0 9.Bc4 Nd7
• Sicilian Defense: Dragon Variation, Yugoslav Attack, Czerniak Variation: 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 g6 6.Be3 Bg7 7.f3 Nc6 8.Qd2 0-0 9.Bc4 Nxd4 10.Bxd4 Be6
• Sicilian Defense: Dragon Variation, Yugoslav Attack, Main Line: 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 g6 6.Be3 Bg7 7.f3 0-0 8.Qd2 Nc6 9.Bc4
• Sicilian Defense: Dragon Variation, Yugoslav Attack, Byrne Variation: 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 g6 6.Be3 Bg7 7.f3 0-0 8.Qd2 Nc6 9.Bc4 a5
• Sicilian Defense: Dragon Variation, Yugoslav Attack: 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 g6 6.Be3 Bg7 7.f3 0-0 8.Qd2 Nc6 9.Bc4 Bd7

• B78 Sicilian, Dragon, Yugoslav Attack, 10.0-0-0
• Sicilian Defense: Dragon Variation, Yugoslav Attack: 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 g6 6.Be3 Bg7 7.f3 0-0 8.Qd2 Nc6 9.Bc4 Bd7 10.0-0-0
• Sicilian Defense: Dragon Variation, Yugoslav Attack, Old Line: 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 g6 6.Be3 Bg7 7.f3 0-0 8.Qd2 Nc6 9.Bc4 Bd7 10.0-0-0 Rc8

• B79 Sicilian, Dragon, Yugoslav Attack, 12.h4
• Sicilian Defense: Dragon Variation, Yugoslav Attack: 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 g6 6.Be3 Bg7 7.f3 0-0 8.Qd2 Nc6 9.Bc4 Bd7 10.h4 Qa5 11.0-0-0 Rfc8 12.Bb3
• Sicilian Defense: Dragon Variation, Yugoslav Attack, Soltis Variation: 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 g6 6.Be3 Bg7 7.f3 0-0 8.Qd2 Nc6 9.Bc4 Bd7 10.0-0-0 Qa5 11.h4 Rfc8 12.Bb3 h5

• B80 Sicilian, Scheveningen Variation
• Sicilian Defense: Scheveningen Variation, English Attack, with Qd2: 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 a6 6.Be3 e6 7.Qd2
• Sicilian Defense: Scheveningen Variation: 1.e4 c5 2.Nf3 e6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 d6
• Sicilian Defense: Scheveningen Variation, Vitolins Variation: 1.e4 c5 2.Nf3 e6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 d6 6.Bb5+
• Sicilian Defense: Scheveningen Variation, Fianchetto Variation: 1.e4 c5 2.Nf3 e6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 d6 6.g3

• B81 Sicilian, Scheveningen, Keres Attack
• Sicilian Defense: Scheveningen Variation, Keres Attack: 1.e4 c5 2.Nf3 e6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 d6 6.g4

• B82 Sicilian, Scheveningen, 6.f4
• Sicilian Defense: Scheveningen Variation, Matanovic Attack: 1.e4 c5 2.Nf3 e6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 d6 6.f4
• Sicilian Defense: Scheveningen Variation, Tal Variation: 1.e4 c5 2.Nf3 e6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 d6 6.f4 Nc6 7.Be3 Be7 8.Qf3

• B83 Sicilian, Scheveningen, 6.Be2
• Sicilian Defense: Scheveningen Variation, Modern Variation: 1.e4 c5 2.Nf3 e6 3.d4 cxd4 4.Nxd4 Nc6 5.Nc3 d6 6.Be2 Nf6
• Sicilian Defense: Scheveningen Variation, Classical Variation: 1.e4 c5 2.Nf3 e6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 d6 6.Be2
• Sicilian Defense: Scheveningen Variation, Modern Variation: 1.e4 c5 2.Nf3 e6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 d6 6.Be2 Be7 7.0-0 0-0 8.f4 Nc6 9.Be3
• Sicilian Defense: Scheveningen Variation, Modern Variation: 1.e4 c5 2.Nf3 e6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 d6 6.Be2 Be7 7.0-0 0-0 8.f4 Nc6 9.Be3 Bd7 10.Nb3

• B84 Sicilian, Scheveningen (Paulsen), Classical Variation
• Sicilian Defense: Scheveningen Variation, Classical Variation: 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 a6 6.Be2 e6
• Sicilian Defense: Najdorf Variation, Scheveningen Variation: 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 a6 6.Be2 e6 7.0-0 Nbd7
• Sicilian Defense: Scheveningen Variation, Classical Variation: 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 a6 6.Be2 e6 7.0-0 Qc7

• B85 Sicilian, Scheveningen, Classical Variation with ...Qc7 and ...Nc6
• Sicilian Defense: Scheveningen Variation, Classical Variation, Paulsen Variation: 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 a6 6.f4 e6 7.Be2 Qc7 8.0-0 Nc6
• Sicilian Defense: Scheveningen Variation, Classical Main Line: 1.e4 c5 2.Nf3 e6 3.d4 cxd4 4.Nxd4 Nc6 5.Nc3 Qc7 6.Be2 a6 7.0-0 Nf6 8.Be3 Be7 9.f4 d6 10.Qe1 0-0
• Sicilian Defense: Scheveningen Variation, Classical Variation, Paulsen Variation: 1.e4 c5 2.Nf3 e6 3.d4 cxd4 4.Nxd4 Nc6 5.Nc3 Qc7 6.Be2 a6 7.0-0 Nf6 8.Be3 d6 9.f4
• Sicilian Defense: Scheveningen Variation, Classical Variation, Paulsen Variation: 1.e4 c5 2.Nf3 e6 3.d4 cxd4 4.Nxd4 Nc6 5.Nc3 Qc7 6.Be2 a6 7.0-0 Nf6 8.Kh1 Be7 9.f4 d6 10.a4

• B86 Sicilian, Sozin Attack
• Sicilian Defense: Sozin Attack: 1.e4 c5 2.Nf3 e6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 d6 6.Bc4

• B87 Sicilian, Sozin with ...a6 and ...b5
• Sicilian Defense: Sozin Attack, Flank Variation: 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 a6 6.Bc4 e6 7.Bb3 b5

• B88 Sicilian, Sozin, Leonhardt Variation
• Sicilian Defense: Sozin Attack, Leonhardt Variation: 1.e4 c5 2.Nf3 Nc6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 d6 6.Bc4 e6
• Sicilian Defense: Sozin Attack, Fischer Variation: 1.e4 c5 2.Nf3 Nc6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 d6 6.Bc4 e6 7.Bb3 Be7 8.Be3 0-0 9.f4

• B89 Sicilian, Sozin, 7.Be3
• Sicilian Defense: Sozin Attack, Main Line, Sherbakov Variation: 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 Nc6 6.Bc4 e6 7.Be3 Be7 8.Bb3 0-0 9.0-0 Na5 10.f4 b6
• Sicilian Defense: Sozin Attack, Main Line: 1.e4 c5 2.Nf3 Nc6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 d6 6.Bc4 e6 7.Be3
• Sicilian Defense: Velimirovic Attack: 1.e4 c5 2.Nf3 Nc6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 d6 6.Bc4 e6 7.Be3 Be7 8.Qe2

• B90 Sicilian, Najdorf
• Sicilian Defense: Najdorf Variation: 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 a6
• Sicilian Defense: Najdorf Variation, Lipnitsky Attack: 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 a6 6.Bc4
• Sicilian Defense: Najdorf Variation, English Attack: 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 a6 6.Be3
• Sicilian Defense: Scheveningen Variation, English Attack, with f3: 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 a6 6.Be3 e6 7.f3
• Sicilian Defense: Scheveningen Variation, Delayed Keres Attack: 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 a6 6.Be3 e6 7.g4
• Sicilian Defense: Scheveningen Variation, Delayed Keres Attack, Perenyi Gambit: 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 a6 6.Be3 e6 7.g4 e5 8.Nf5 g6 9.g5
• Sicilian Defense: Najdorf Variation, English Attack, Anti-English: 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 a6 6.Be3 Ng4
• Sicilian Defense: Najdorf Variation, Dekker Gambit: 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 a6 6.g4
• Sicilian Defense: Najdorf Variation, Adams Attack: 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 a6 6.h3
• Sicilian Defense: Najdorf Variation, Freak Attack: 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 a6 6.Rg1

• B91 Sicilian, Najdorf, Zagreb (Fianchetto) Variation (6.g3)
• Sicilian Defense: Najdorf Variation, Zagreb Variation: 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 a6 6.g3

• B92 Sicilian, Najdorf, Opocensky Variation (6.Be2)
• Sicilian Defense: Najdorf Variation, Opocensky Variation: 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 a6 6.Be2
• Sicilian Defense: Najdorf Variation, Opocensky Variation, Modern Line: 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 a6 6.Be2 e5 7.Nb3 Be7 8.0-0 Be6
• Sicilian Defense: Najdorf Variation, Opocensky Variation, Traditional Line: 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 a6 6.Be2 e5 7.Nb3 Be7 8.0-0 0-0
• Sicilian Defense: Najdorf Variation, Opocensky Variation: 1.e4 c5 2.Nf3 Nf6 3.Nc3 d6 4.d4 cxd4 5.Nxd4 a6 6.Be2 e5 7.Nb3 Be6 8.Be3

• B93 Sicilian, Najdorf, 6.f4
• Sicilian Defense: Najdorf Variation, Amsterdam Variation: 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 a6 6.f4

• B94 Sicilian, Najdorf, 6.Bg5
• Sicilian Defense: Najdorf Variation: 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 a6 6.Bg5
• Sicilian Defense: Najdorf Variation, Ivkov Variation: 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 a6 6.Bg5 Nbd7 7.Bc4 Qa5 8.Qd2 e6 9.0-0-0 b5 10.Bb3 Bb7 11.Rhe1 Nc5 12.e5

• B95 Sicilian, Najdorf, 6...e6
• Sicilian Defense: Najdorf Variation: 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 a6 6.Bg5 e6

• B96 Sicilian, Najdorf, 7.f4
• Sicilian Defense: Najdorf Variation: 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 a6 6.Bg5 e6 7.f4
• Sicilian Defense: Najdorf Variation, Polugaevsky Variation: 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 a6 6.Bg5 e6 7.f4 b5
• Sicilian Defense: Najdorf Variation, Polugaevsky Variation, Simagin Line: 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 a6 6.Bg5 e6 7.f4 b5 8.e5 dxe5 9.fxe5 Qc7 10.Qe2
• Sicilian Defense: Najdorf Variation, Neo-Classical Defense: 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 a6 6.Bg5 e6 7.f4 Nc6

• B97 Sicilian, Najdorf, 7...Qb6 including Poisoned Pawn Variation
• Sicilian Defense: Najdorf Variation, Poisoned Pawn Variation: 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 a6 6.Bg5 e6 7.f4 Qb6
• Sicilian Defense: Najdorf Variation, Poisoned Pawn Accepted: 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 a6 6.Bg5 e6 7.f4 Qb6 8.Qd2 Qxb2 9.Rb1 Qa3

• B98 Sicilian, Najdorf, 7...Be7
• Sicilian Defense: Najdorf Variation: 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 a6 6.Bg5 e6 7.f4 Be7
• Sicilian Defense: Najdorf Variation, Goteborg Variation: 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 a6 6.Bg5 e6 7.f4 Be7 8.Qf3 h6 9.Bh4 g5
• Sicilian Defense: Najdorf Variation, Browne Variation: 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 a6 6.Bg5 e6 7.f4 Be7 8.Qf3 h6 9.Bh4 Qc7
• Sicilian Defense: Najdorf Variation, Traditional Line: 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 a6 6.Bg5 e6 7.f4 Be7 8.Qf3 Qc7

• B99 Sicilian, Najdorf, 7...Be7 Main line
• Sicilian Defense: Najdorf Variation, Main Line: 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 a6 6.Bg5 e6 7.f4 Be7 8.Qf3 Qc7 9.0-0-0 Nbd7

• 1.e4 e6: French Defence (C00–C19)
• 1.e4 e5: Open Game (C20–C99)

1.e4 e6: French Defence

• C00 French Defence
• French Defense: 1.e4 e6
• French Defense: Horwitz Attack: 1.e4 e6 2.b3
• French Defense: Horwitz Attack, Papa-Ticulat Gambit: 1.e4 e6 2.b3 d5 3.Bb2
• French Defense: Banzai-Leong Gambit: 1.e4 e6 2.b4
• French Defense: Banzai-Leong Gambit, Pinova Gambit: 1.e4 e6 2.b4 Bxb4 3.e5
• French Defense: Bird Invitation: 1.e4 e6 2.Bb5
• French Defense: Steiner Variation: 1.e4 e6 2.c4
• French Defense: Orthoschnapp Gambit: 1.e4 e6 2.c4 d5 3.cxd5 exd5 4.Qb3
• French Defense: King's Indian Attack: 1.e4 e6 2.d3
• French Defense: Reversed Philidor Formation: 1.e4 e6 2.d3 d5 3.Nd2 Nf6 4.Ngf3 Nc6 5.Be2
• French Defense: King's Indian Attack, Franco-Hiva Gambit: 1.e4 e6 2.d3 f5
• French Defense: Normal Variation: 1.e4 e6 2.d4
• French Defense: St. George Defense: 1.e4 e6 2.d4 a6
• French Defense: St. George Defense, Three Pawn Attack: 1.e4 e6 2.d4 a6 3.c4
• French Defense: St. George Defense, Sanky-George Gambit: 1.e4 e6 2.d4 a6 3.c4 b5
• French Defense: St. George Defense, St. George Gambit: 1.e4 e6 2.d4 a6 3.c4 b5 4.cxb5 axb5
• French Defense: St. George Defense, Traditional Line: 1.e4 e6 2.d4 a6 3.Nf3 b5 4.Bd3 c5 5.c3 Bb7 6.0-0 Nf6
• French Defense: Baeuerle Gambit: 1.e4 e6 2.d4 b5
• French Defense: Franco-Sicilian Defense: 1.e4 e6 2.d4 c5
• French Defense: 1.e4 e6 2.d4 d5
• French Defense: Schlechter Variation: 1.e4 e6 2.d4 d5 3.Bd3
• French Defense: Alapin Gambit: 1.e4 e6 2.d4 d5 3.Be3
• French Defense: Diemer-Duhm Gambit: 1.e4 e6 2.d4 d5 3.c4
• French Defense: Diemer-Duhm Gambit Accepted: 1.e4 e6 2.d4 d5 3.c4 dxe4
• French Defense: Perseus Gambit: 1.e4 e6 2.d4 d5 3.Nf3
• French Defense: Carlson Gambit: 1.e4 e6 2.d4 d5 3.Nf3 dxe4 4.Ne5
• French Defense: Morphy Gambit: 1.e4 e6 2.d4 d5 3.Nh3
• French Defense: Hoffmann Gambit: 1.e4 e6 2.d4 d5 3.Qe2 e5 4.f4 exf4
• French Defense: Franco-Hiva Gambit: 1.e4 e6 2.d4 f5
• French Defense: Franco-Hiva Gambit Accepted: 1.e4 e6 2.d4 f5 3.exf5
• French Defense: Mediterranean Defense: 1.e4 e6 2.d4 Nf6
• Lengfellner system: 1.e4 e6 2.d4 d6
• French Defense: Steinitz Attack: 1.e4 e6 2.e5
• French Defense: La Bourdonnais Variation: 1.e4 e6 2.f4
• French Defense: La Bourdonnais Variation, Reuter Gambit: 1.e4 e6 2.f4 d5 3.Nf3 dxe4
• French Defense: Réti-Spielmann Attack: 1.e4 e6 2.g3
• French Defense: Queen's Knight: 1.e4 e6 2.Nc3
• French Defense: Pelikan Variation: 1.e4 e6 2.Nc3 d5 3.f4
• French Defense: Knight Variation: 1.e4 e6 2.Nf3
• French Defense: Wing Gambit: 1.e4 e6 2.Nf3 d5 3.e5 c5 4.b4
• French Defense: Two Knights Variation: 1.e4 e6 2.Nf3 d5 3.Nc3
• French Defense: Knight Variation, Franco-Hiva Gambit: 1.e4 e6 2.Nf3 f5
• French Defense: Chigorin Variation: 1.e4 e6 2.Qe2

• C01 French, Exchange Variation
• French Defense: Exchange Variation: 1.e4 e6 2.d4 d5 3.exd5
• French Defense: Exchange Variation, Monte Carlo Variation: 1.e4 e6 2.d4 d5 3.exd5 exd5 4.c4
• French Defense: Exchange Variation, Bogoljubow Variation: 1.e4 e6 2.d4 d5 3.exd5 exd5 4.Nc3 Nf6 5.Bg5 Nc6
• French Defense: Exchange Variation, Svenonius Variation: 1.e4 e6 2.d4 d5 3.Nc3 Nf6 4.exd5 exd5 5.Bg5

• C02 French, Advance Variation
• French Defense: Advance Variation: 1.e4 e6 2.d4 d5 3.e5
• French Defense: Advance Variation, Extended Bishop Swap: 1.e4 e6 2.d4 d5 3.e5 Bd7
• French Defense: Advance Variation: 1.e4 e6 2.d4 d5 3.e5 c5
• French Defense: Advance Variation, Frenkel Gambit: 1.e4 e6 2.d4 d5 3.e5 c5 4.b4
• French Defense: Advance Variation: 1.e4 e6 2.d4 d5 3.e5 c5 4.c3
• French Defense: Advance Variation: 1.e4 e6 2.d4 d5 3.e5 c5 4.c3 Nc6
• French Defense: Advance Variation, Paulsen Attack: 1.e4 e6 2.d4 d5 3.e5 c5 4.c3 Nc6 5.Nf3
• French Defense: Advance Variation, Euwe Variation: 1.e4 e6 2.d4 d5 3.e5 c5 4.c3 Nc6 5.Nf3 Bd7
• French Defense: Advance Variation, Main Line: 1.e4 e6 2.d4 d5 3.e5 c5 4.c3 Nc6 5.Nf3 Qb6 6.a3
• French Defense: Advance Variation, Lputian Variation: 1.e4 e6 2.d4 d5 3.e5 c5 4.c3 Nc6 5.Nf3 Qb6 6.a3 Nh6
• French Defense: Advance Variation, Milner-Barry Gambit: 1.e4 e6 2.d4 d5 3.e5 c5 4.c3 Nc6 5.Nf3 Qb6 6.Bd3
• French Defense: Advance Variation, Milner-Barry Gambit, Deine Mutter Variation: 1.e4 e6 2.d4 d5 3.e5 c5 4.c3 Nc6 5.Nf3 Qb6 6.Bd3 Qb5 7.Bxb5
• French Defense: Advance Variation, Wade Variation: 1.e4 e6 2.d4 d5 3.e5 c5 4.c3 Qb6 5.Nf3 Bd7
• French Defense: Advance Variation, Steinitz Variation: 1.e4 e6 2.d4 d5 3.e5 c5 4.dxc5
• French Defense: Advance Variation, Nimzowitsch System: 1.e4 e6 2.d4 d5 3.e5 c5 4.Nf3
• French Defense: Advance Variation, Ruisdonk Gambit: 1.e4 e6 2.d4 d5 3.e5 c5 4.Nf3 cxd4 5.Bd3
• French Defense: Advance Variation, Nimzowitsch Attack: 1.e4 e6 2.d4 d5 3.e5 c5 4.Qg4
• French Defense: Advance Variation, Nimzowitsch Gambit: 1.e4 e6 2.d4 d5 3.e5 c5 4.Qg4 cxd4 5.Nf3

• C03 French, Tarrasch
• French Defense: Tarrasch Variation: 1.e4 e6 2.d4 d5 3.Nd2
• French Defense: Tarrasch Variation, Modern System: 1.e4 e6 2.d4 d5 3.Nd2 a6
• French Defense: Tarrasch Variation, Morozevich Variation: 1.e4 e6 2.d4 d5 3.Nd2 Be7
• French Defense: Tarrasch Variation, Haberditz Variation: 1.e4 e6 2.d4 d5 3.Nd2 f5
• French Defense: Tarrasch Variation, Guimard Defense: 1.e4 e6 2.d4 d5 3.Nd2 Nc6
• French Defense: Guimard Variation, Thunderbunny Variation: 1.e4 e6 2.d4 d5 3.Nd2 Nc6 4.c3 dxe4 5.Nxe4 e5

• C04 French, Tarrasch, Guimard Main line
• French Defense: Tarrasch Variation, Guimard Defense, Main Line: 1.e4 e6 2.d4 d5 3.Nd2 Nc6 4.Ngf3 Nf6

• C05 French, Tarrasch, Closed Variation
• French Defense: Tarrasch Variation, Closed Variation: 1.e4 e6 2.d4 d5 3.Nd2 Nf6
• French Defense: Tarrasch Variation, Botvinnik Variation: 1.e4 e6 2.d4 d5 3.Nd2 Nf6 4.e5 Nfd7 5.Bd3 c5 6.c3 b6
• French Defense: Tarrasch Variation, Closed Variation: 1.e4 e6 2.d4 d5 3.Nd2 Nf6 4.e5 Nfd7 5.Bd3 c5 6.c3 Nc6
• French Defense: Tarrasch Variation, Pawn Center Variation: 1.e4 e6 2.d4 d5 3.Nd2 Nf6 4.e5 Nfd7 5.f4

• C06 French, Tarrasch, Closed Variation, Main line
• French Defense: Tarrasch Variation, Closed Variation, Main Line: 1.e4 e6 2.d4 d5 3.Nd2 Nf6 4.e5 Nfd7 5.Bd3 c5 6.c3 Nc6 7.Ne2 cxd4 8.cxd4
• French Defense: Tarrasch Variation, Leningrad Variation: 1.e4 e6 2.d4 d5 3.Nd2 Nf6 4.e5 Nfd7 5.Bd3 c5 6.c3 Nc6 7.Ne2 cxd4 8.cxd4 Nb6

• C07 French, Tarrasch, Open Variation
• French Defense: Tarrasch Variation, Open System: 1.e4 e6 2.d4 d5 3.Nd2 c5
• French Defense: Tarrasch Variation, Open System, Süchting Line: 1.e4 e6 2.d4 d5 3.Nd2 c5 4.c3
• French Defense: Tarrasch Variation, Open System, Shaposhnikov Gambit: 1.e4 e6 2.d4 d5 3.Nd2 c5 4.exd5 Nf6
• French Defense: Tarrasch Variation, Chistyakov Defense: 1.e4 e6 2.d4 d5 3.Nd2 c5 4.exd5 Qxd5
• French Defense: Tarrasch Variation, Chistyakov Defense, Modern Line: 1.e4 e6 2.d4 d5 3.Nd2 c5 4.exd5 Qxd5 5.Ngf3 cxd4 6.Bc4 Qd6 7.0-0 Nf6 8.Nb3 Nc6 9.Nbxd4 Nxd4 10.Nxd4 a6
• French Defense: Tarrasch Variation, Eliskases Variation: 1.e4 e6 2.d4 d5 3.Nd2 c5 4.exd5 Qxd5 5.Ngf3 cxd4 6.Bc4 Qd8
• French Defense: Tarrasch Variation, Open System, Euwe-Keres Line: 1.e4 e6 2.d4 d5 3.Nd2 c5 4.Ngf3

• C08 French, Tarrasch, Open, 4.exd5 exd5
• French Defense: Tarrasch Variation, Open System: 1.e4 e6 2.d4 d5 3.Nd2 c5 4.exd5 exd5
• French Defense: Tarrasch Variation, Open System, Advance Line: 1.e4 e6 2.d4 d5 3.Nd2 c5 4.exd5 exd5 5.Ngf3 c4

• C09 French, Tarrasch, Open Variation, Main line
• French Defense: Tarrasch Variation, Open System, Main Line: 1.e4 e6 2.d4 d5 3.Nd2 c5 4.exd5 exd5 5.Ngf3 Nc6

• C10 French, Paulsen Variation
• Sicilian Defense: Marshall Gambit: 1.e4 c5 2.Nc3 e6 3.d4 d5
• French Defense: Paulsen Variation: 1.e4 e6 2.d4 d5 3.Nc3
• French Defense: Rubinstein Variation: 1.e4 e6 2.d4 d5 3.Nc3 dxe4
• French Defense: Rubinstein Variation, Fort Knox Variation: 1.e4 e6 2.d4 d5 3.Nc3 dxe4 4.Nxe4 Bd7 5.Nf3 Bc6
• French Defense: Rubinstein Variation, Ellis Gambit: 1.e4 e6 2.d4 d5 3.Nc3 dxe4 4.Nxe4 e5
• French Defense: Rubinstein Variation, Blackburne Defense: 1.e4 e6 2.d4 d5 3.Nc3 dxe4 4.Nxe4 Nd7
• French Defense: Rubinstein Variation, Capablanca Line: 1.e4 e6 2.d4 d5 3.Nc3 dxe4 4.Nxe4 Nd7 5.Nf3 Ngf6 6.Nxf6+ Nxf6 7.Ne5
• French Defense: Rubinstein Variation, Maric Variation: 1.e4 e6 2.d4 d5 3.Nc3 dxe4 4.Nxe4 Qd5
• French Defense: Classical Variation, Svenonius Variation: 1.e4 e6 2.d4 d5 3.Nc3 Nc6 4.exd5
• French Defense: Rubinstein Variation, Kasparov Attack: 1.e4 e6 2.d4 d5 3.Nd2 dxe4 4.Nxe4 Nd7 5.Nf3 Ngf6 6.Nxf6+ Nxf6 7.c3

• C11 French Defence
• French Defense: Steinitz Variation: 1.e4 e6 2.d4 d5 3.Nc3 a6 4.Nf3 Nf6 5.e5 Nfd7
• French Defense: Steinitz Variation: 1.e4 e6 2.d4 d5 3.Nc3 a6 4.Nf3 Nf6 5.e5 Nfd7 6.a3
• French Defense: Steinitz Variation: 1.e4 e6 2.d4 d5 3.Nc3 a6 4.Nf3 Nf6 5.e5 Nfd7 6.Ne2
• French Defense: Classical Variation: 1.e4 e6 2.d4 d5 3.Nc3 Nf6
• French Defense: Classical Variation, Swiss Variation: 1.e4 e6 2.d4 d5 3.Nc3 Nf6 4.Bd3
• French Defense: Henneberger Variation: 1.e4 e6 2.d4 d5 3.Nc3 Nf6 4.Be3
• French Defense: Burn Variation: 1.e4 e6 2.d4 d5 3.Nc3 Nf6 4.Bg5
• French Defense: Classical Variation, Burn Variation, Main Line: 1.e4 e6 2.d4 d5 3.Nc3 Nf6 4.Bg5 dxe4 5.Nxe4 Be7 6.Bxf6 Bxf6 7.Nf3 0-0
• French Defense: Classical Variation, Burn Variation, Morozevich Line: 1.e4 e6 2.d4 d5 3.Nc3 Nf6 4.Bg5 dxe4 5.Nxe4 Be7 6.Bxf6 gxf6
• French Defense: Classical Variation, Steinitz Variation: 1.e4 e6 2.d4 d5 3.Nc3 Nf6 4.e5
• French Defense: Steinitz Variation, Bradford Attack Variation: 1.e4 e6 2.d4 d5 3.Nc3 Nf6 4.e5 Nfd7 5.f4 c5 6.dxc5 Bxc5 7.Qg4
• French Defense: Steinitz Variation: 1.e4 e6 2.d4 d5 3.Nc3 Nf6 4.e5 Nfd7 5.f4 c5 6.dxc5 Nc6
• French Defense: Steinitz Variation, Brodsky-Jones Variation: 1.e4 e6 2.d4 d5 3.Nc3 Nf6 4.e5 Nfd7 5.f4 c5 6.dxc5 Nc6 7.a3 Bxc5 8.Qg4 0-0 9.Nf3 f6
• French Defense: Steinitz Variation: 1.e4 e6 2.d4 d5 3.Nc3 Nf6 4.e5 Nfd7 5.f4 c5 6.Nf3
• French Defense: Steinitz Variation, Boleslavsky Variation: 1.e4 e6 2.d4 d5 3.Nc3 Nf6 4.e5 Nfd7 5.f4 c5 6.Nf3 Nc6 7.Be3
• French Defense: Steinitz Variation, Gledhill Attack: 1.e4 e6 2.d4 d5 3.Nc3 Nf6 4.e5 Nfd7 5.Qg4
• French Defense: Classical Variation, Delayed Exchange Variation: 1.e4 e6 2.d4 d5 3.Nc3 Nf6 4.exd5

• C12 French, MacCutcheon Variation
• French Defense: MacCutcheon Variation: 1.e4 e6 2.d4 d5 3.Nc3 Nf6 4.Bg5 Bb4
• French Defense: MacCutcheon Variation, Advance Variation: 1.e4 e6 2.d4 d5 3.Nc3 Nf6 4.Bg5 Bb4 5.e5
• French Defense: MacCutcheon Variation, Dr. Olland Variation: 1.e4 e6 2.d4 d5 3.Nc3 Nf6 4.Bg5 Bb4 5.e5 h6 6.Bc1
• French Defense: MacCutcheon Variation, Lasker Variation: 1.e4 e6 2.d4 d5 3.Nc3 Nf6 4.Bg5 Bb4 5.e5 h6 6.Bd2 Bxc3
• French Defense: MacCutcheon Variation, Lasker Variation: 1.e4 e6 2.d4 d5 3.Nc3 Nf6 4.Bg5 Bb4 5.e5 h6 6.Bd2 Bxc3 7.bxc3 Ne4 8.Qg4 g6
• French Defense: MacCutcheon Variation, Tartakower Variation: 1.e4 e6 2.d4 d5 3.Nc3 Nf6 4.Bg5 Bb4 5.e5 h6 6.Bd2 Nfd7
• French Defense: MacCutcheon Variation, Janowski Variation: 1.e4 e6 2.d4 d5 3.Nc3 Nf6 4.Bg5 Bb4 5.e5 h6 6.Be3
• French Defense: MacCutcheon Variation, Bernstein Variation: 1.e4 e6 2.d4 d5 3.Nc3 Nf6 4.Bg5 Bb4 5.e5 h6 6.Bh4
• French Defense: MacCutcheon Variation, Chigorin Variation: 1.e4 e6 2.d4 d5 3.Nc3 Nf6 4.Bg5 Bb4 5.e5 h6 6.exf6
• French Defense: MacCutcheon Variation, Grigoriev Variation: 1.e4 e6 2.d4 d5 3.Nc3 Nf6 4.Bg5 Bb4 5.e5 h6 6.exf6 hxg5 7.fxg7 Rg8 8.h4 gxh4 9.Qg4
• French Defense: MacCutcheon Variation, Exchange Variation: 1.e4 e6 2.d4 d5 3.Nc3 Nf6 4.Bg5 Bb4 5.exd5
• French Defense: MacCutcheon Variation, Bogoljubow Variation: 1.e4 e6 2.d4 d5 3.Nc3 Nf6 4.Bg5 Bb4 5.exd5 Qxd5 6.Bxf6 gxf6 7.Qd2 Qa5
• French Defense: MacCutcheon Variation, Duras Variation: 1.e4 e6 2.Nc3 d5 3.d4 Nf6 4.Bg5 Bb4 5.e5 h6 6.Bd2 Bxc3 7.bxc3 Ne4 8.Qg4 Kf8 9.Bc1

• C13 French, Classical
• French Defense: Classical Variation, Normal Variation: 1.e4 e6 2.d4 d5 3.Nc3 Nf6 4.Bg5 Be7
• French Defense: Classical Variation, Richter Attack: 1.e4 e6 2.d4 d5 3.Nc3 Nf6 4.Bg5 Be7 5.Bxf6
• French Defense: Classical Variation, Richter Attack: 1.e4 e6 2.d4 d5 3.Nc3 Nf6 4.Bg5 Be7 5.Bxf6 Bxf6 6.e5 Be7 7.Qg4
• French Defense: Classical Variation, Tartakower Variation: 1.e4 e6 2.d4 d5 3.Nc3 Nf6 4.Bg5 Be7 5.e5 Ne4
• French Defense: Alekhine-Chatard Attack: 1.e4 e6 2.d4 d5 3.Nc3 Nf6 4.Bg5 Be7 5.e5 Nfd7 6.h4
• French Defense: Alekhine-Chatard Attack, Maróczy Variation: 1.e4 e6 2.d4 d5 3.Nc3 Nf6 4.Bg5 Be7 5.e5 Nfd7 6.h4 a6
• French Defense: Alekhine-Chatard Attack, Albin-Chatard Gambit: 1.e4 e6 2.d4 d5 3.Nc3 Nf6 4.Bg5 Be7 5.e5 Nfd7 6.h4 Bxg5 7.hxg5 Qxg5
• French Defense: Alekhine-Chatard Attack, Breyer Variation: 1.e4 e6 2.d4 d5 3.Nc3 Nf6 4.Bg5 Be7 5.e5 Nfd7 6.h4 c5
• French Defense: Alekhine-Chatard Attack, Teichmann Variation: 1.e4 e6 2.d4 d5 3.Nc3 Nf6 4.Bg5 Be7 5.e5 Nfd7 6.h4 f6
• French Defense: Alekhine-Chatard Attack, Spielmann Variation: 1.e4 e6 2.d4 d5 3.Nc3 Nf6 4.Bg5 Be7 5.e5 Nfd7 6.h4 0-0
• French Defense: Classical Variation, Vistaneckis Variation: 1.e4 e6 2.d4 d5 3.Nc3 Nf6 4.Bg5 Be7 5.e5 Ng8
• French Defense: Classical Variation, Frankfurt Variation: 1.e4 e6 2.d4 d5 3.Nc3 Nf6 4.Bg5 Be7 5.e5 Ng8 6.Be3 b6

• C14 French, Classical Variation
• French Defense: Classical Variation: 1.e4 e6 2.d4 d5 3.Nc3 a6 4.Nf3 Nf6 5.e5 Nfd7 6.Bg5
• French Defense: Classical Variation: 1.e4 e6 2.d4 d5 3.Nc3 Nf6 4.Bg5 Be7 5.e5 Nfd7 6.Bxe7 Qxe7
• French Defense: Classical Variation, Tarrasch Variation: 1.e4 e6 2.d4 d5 3.Nc3 Nf6 4.Bg5 Be7 5.e5 Nfd7 6.Bxe7 Qxe7 7.Bd3
• French Defense: Classical Variation, Steinitz Variation: 1.e4 e6 2.d4 d5 3.Nc3 Nf6 4.Bg5 Be7 5.e5 Nfd7 6.Bxe7 Qxe7 7.f4
• French Defense: Classical Variation, Stahlberg Variation: 1.e4 e6 2.d4 d5 3.Nc3 Nf6 4.Bg5 Be7 5.e5 Nfd7 6.Bxe7 Qxe7 7.f4 0-0 8.Nf3 c5 9.Qd2 Nc6 10.0-0-0 c4
• French Defense: Classical Variation, Alapin Variation: 1.e4 e6 2.d4 d5 3.Nc3 Nf6 4.Bg5 Be7 5.e5 Nfd7 6.Bxe7 Qxe7 7.Nb5
• French Defense: Classical Variation, Rubinstein Variation: 1.e4 e6 2.d4 d5 3.Nc3 Nf6 4.Bg5 Be7 5.e5 Nfd7 6.Bxe7 Qxe7 7.Qd2
• French Defense: Classical Variation, Pollock Variation: 1.e4 e6 2.d4 d5 3.Nc3 Nf6 4.Bg5 Be7 5.e5 Nfd7 6.Bxe7 Qxe7 7.Qg4

• C15 French, Winawer (Nimzovich) Variation
• French Defense: Winawer Variation: 1.e4 e6 2.d4 d5 3.Nc3 Bb4
• French Defense: Winawer Variation, Winckelmann-Reimer Gambit: 1.e4 e6 2.d4 d5 3.Nc3 Bb4 4.a3 Bxc3+ 5.bxc3 dxe4 6.f3
• French Defense: Winawer Variation, Fingerslip Variation: 1.e4 e6 2.d4 d5 3.Nc3 Bb4 4.Bd2
• French Defense: Winawer Variation, Fingerslip Variation, Main Line: 1.e4 e6 2.d4 d5 3.Nc3 Bb4 4.Bd2 dxe4 5.Qg4 Nf6 6.Qxg7 Rg8 7.Qh6
• French Defense: Winawer Variation, Fingerslip Variation, Kunin Double Gambit: 1.e4 e6 2.d4 d5 3.Nc3 Bb4 4.Bd2 dxe4 5.Qg4 Qxd4
• French Defense: Winawer Variation, Fingerslip Variation, Schwarz's Line: 1.e4 e6 2.d4 d5 3.Nc3 Bb4 4.Bd2 Ne7 5.Nb1
• French Defense: Winawer Variation, Kondratiyev Variation: 1.e4 e6 2.d4 d5 3.Nc3 Bb4 4.Bd3 c5 5.exd5 Qxd5 6.Bd2
• French Defense: Winawer Variation, Delayed Exchange Variation: 1.e4 e6 2.d4 d5 3.Nc3 Bb4 4.exd5
• French Defense: Winawer Variation, Exchange Variation, Canal Attack: 1.e4 e6 2.d4 d5 3.Nc3 Bb4 4.exd5 exd5 5.Bd3 Ne7 6.Qh5
• French Defense: Winawer Variation, Alekhine-Maróczy Gambit: 1.e4 e6 2.d4 d5 3.Nc3 Bb4 4.Ne2
• French Defense: Winawer Variation, Alekhine Gambit, Alatortsev Variation: 1.e4 e6 2.d4 d5 3.Nc3 Bb4 4.Ne2 dxe4 5.a3 Be7 6.Nxe4 Nf6 7.N2g3 0-0 8.Be2 Nc6
• French Defense: Winawer Variation, Alekhine Gambit Accepted: 1.e4 e6 2.d4 d5 3.Nc3 Bb4 4.Ne2 dxe4 5.a3 Bxc3+
• French Defense: Winawer Variation, Alekhine Gambit, Kan Variation: 1.e4 e6 2.d4 d5 3.Nc3 Bb4 4.Ne2 dxe4 5.a3 Bxc3+ 6.Nxc3 Nc6
• French Defense: MacCutcheon Variation, Wolf Gambit: 1.e4 e6 2.d4 d5 3.Nc3 Bb4 4.Ne2 Nf6 5.Bg5

• C16 French, Winawer, Advance Variation
• French Defense: Winawer Variation, Advance Variation: 1.e4 e6 2.d4 d5 3.Nc3 Bb4 4.e5
• French Defense: Winawer Variation, Petrosian Variation: 1.e4 e6 2.d4 d5 3.Nc3 Bb4 4.e5 Qd7

• C17 French, Winawer, Advance Variation
• French Defense: Winawer Variation, Advance Variation: 1.e4 e6 2.d4 d5 3.Nc3 Bb4 4.e5 c5
• French Defense: Winawer Variation, Advance Variation: 1.e4 e6 2.d4 d5 3.Nc3 Bb4 4.e5 c5 5.a3
• French Defense: Winawer Variation, Retreat Variation: 1.e4 e6 2.d4 d5 3.Nc3 Bb4 4.e5 c5 5.a3 Ba5
• French Defense: Winawer Variation, Retreat Variation, Armenian Line: 1.e4 e6 2.d4 d5 3.Nc3 Bb4 4.e5 c5 5.a3 Ba5 6.b4 cxd4
• French Defense: Winawer Variation, Marózy-Wallis Variation: 1.e4 e6 2.d4 d5 3.Nc3 Bb4 4.e5 c5 5.a3 cxd4 6.axb4 dxc3
• French Defense: Winawer Variation, Advance Variation: 1.e4 e6 2.d4 d5 3.Nc3 Bb4 4.e5 c5 5.a3 cxd4 6.axb4 dxc3 7.Nf3
• French Defense: Winawer Variation, Bogoljubow Variation: 1.e4 e6 2.d4 d5 3.Nc3 Bb4 4.e5 c5 5.Bd2
• French Defense: Winawer Variation, Bogoljubow Variation, Icelandic Defense: 1.e4 e6 2.d4 d5 3.Nc3 Bb4 4.e5 c5 5.Bd2 Ne7 6.f4
• French Defense: Winawer Variation, Advance Variation, Moscow Variation: 1.e4 e6 2.d4 d5 3.Nc3 Bb4 4.e5 c5 5.Qg4

• C18 French, Winawer, Advance Variation
• French Defense: Winawer Variation, Advance Variation: 1.e4 e6 2.d4 d5 3.Nc3 Bb4 4.e5 c5 5.a3 Bxc3+ 6.bxc3
• French Defense: Winawer Variation, Portisch-Hook Variation: 1.e4 e6 2.d4 d5 3.Nc3 Bb4 4.e5 c5 5.a3 Bxc3+ 6.bxc3 Qa5
• French Defense: Winawer Variation, Classical Variation: 1.e4 e6 2.d4 d5 3.Nc3 Bb4 4.e5 c5 5.a3 Bxc3+ 6.bxc3 Qc7

• C19 French, Winawer, Advance, 6...Ne7
• French Defense: Winawer Variation, Advance Variation: 1.e4 e6 2.d4 d5 3.Nc3 Bb4 4.e5 c5 5.a3 Bxc3+ 6.bxc3 Ne7
• French Defense: Winawer Variation, Advance Variation: 1.e4 e6 2.d4 d5 3.Nc3 Bb4 4.e5 c5 5.a3 Bxc3+ 6.bxc3 Ne7 7.a4
• French Defense: Winawer Variation, Positional Variation: 1.e4 e6 2.d4 d5 3.Nc3 Bb4 4.e5 c5 5.a3 Bxc3+ 6.bxc3 Ne7 7.Nf3
• French Defense: Winawer Variation, Poisoned Pawn Variation: 1.e4 e6 2.d4 d5 3.Nc3 Bb4 4.e5 c5 5.a3 Bxc3+ 6.bxc3 Ne7 7.Qg4
• French Defense: Winawer Variation, Poisoned Pawn Variation, Paoli Variation: 1.e4 e6 2.d4 d5 3.Nc3 Bb4 4.e5 c5 5.a3 Bxc3+ 6.bxc3 Ne7 7.Qg4 Qc7 8.Qxg7 Rg8 9.Qxh7 cxd4 10.Kd1
• French Defense: Winawer Variation, Poisoned Pawn Variation, Main Line: 1.e4 e6 2.d4 d5 3.Nc3 Bb4 4.e5 c5 5.a3 Bxc3+ 6.bxc3 Ne7 7.Qg4 Qc7 8.Qxg7 Rg8 9.Qxh7 cxd4 10.Ne2

1.e4 e5: Open Game

• C20 King's Pawn Game (includes Alapin's Opening, Centre Pawn Opening, Napoleon Opening, Portuguese Opening, Danvers Opening, Bongcloud Attack)
• King's Pawn Game: 1.e4 e5
• King's Pawn Game: Mengarini's Opening: 1.e4 e5 2.a3
• King's Pawn Opening: 1.e4 e5 2.b3
• Portuguese Opening: 1.e4 e5 2.Bb5
• Portuguese Opening: Miguel Gambit: 1.e4 e5 2.Bb5 Bc5 3.b4
• Portuguese Opening: Portuguese Gambit: 1.e4 e5 2.Bb5 Nf6 3.d4
• King's Pawn Game: Tortoise Opening: 1.e4 e5 2.Bd3
• King's Pawn Game: MacLeod Attack: 1.e4 e5 2.c3
• King's Pawn Game: MacLeod Attack, Norwalde Gambit: 1.e4 e5 2.c3 d5 3.Qh5 Bd6
• King's Pawn Game: MacLeod Attack, Lasa Gambit: 1.e4 e5 2.c3 f5
• English Opening: The Whale: 1.e4 e5 2.c4
• King's Pawn Game: Bavarian Gambit: 1.e4 e5 2.c4 d5
• King's Pawn Game: Leonardis Variation: 1.e4 e5 2.d3
• King's Pawn Game: Weber Gambit: 1.e4 e5 2.d3 d5 3.exd5 c6 4.dxc6 Nxc6
• King's Pawn Game: Clam Variation, King's Gambit Reversed: 1.e4 e5 2.d3 f5
• King's Pawn Game: Clam Variation, Radisch Gambit: 1.e4 e5 2.d3 Nf6 3.f4 Bc5
• Center Game: 1.e4 e5 2.d4
• King's Pawn Game: Beyer Gambit: 1.e4 e5 2.d4 d5
• King's Pawn Game: Philidor Gambit: 1.e4 e5 2.d4 d6 3.dxe5 Bd7
• King's Pawn Game: King's Head Opening: 1.e4 e5 2.f3
• King's Pawn Game: King's Head Opening: 1.e4 e5 2.f3 Nf6 3.Nc3
• Bongcloud Attack: 1.e4 e5 2.Ke2
• King's Pawn Game: Alapin Opening: 1.e4 e5 2.Ne2
• King's Pawn Opening: Van Hooydoon Gambit: 1.e4 e5 2.Qe2 Nc6 3.c3 Nf6 4.Nf3 Bc5 5.d4 exd4 6.cxd4 Nxd4
• King's Pawn Game: Napoleon Attack: 1.e4 e5 2.Qf3
• King's Pawn Opening: Speers: 1.e4 e5 2.Qg4 Nf6 3.Qf5
• King's Pawn Game: Wayward Queen Attack (Danvers Opening) : 1.e4 e5 2.Qh5
• King's Pawn Game: Wayward Queen Attack, Mellon Gambit: 1.e4 e5 2.Qh5 Nc6 3.Bc4 Nh6 4.d3 g6 5.Qf3 f6 6.Ne2 d5
• King's Pawn Game: Wayward Queen Attack, Kiddie Countergambit: 1.e4 e5 2.Qh5 Nf6
• Barnes Opening: Walkerling: 1.f3 e5 2.e4 Nf6 3.Bc4

• C21 Center Game (includes Danish Gambit)
• Center Game Accepted: 1.e4 e5 2.d4 exd4
• Center Game: von der Lasa Gambit: 1.e4 e5 2.d4 exd4 3.Bc4
• Center Game: Ross Gambit: 1.e4 e5 2.d4 exd4 3.Bd3
• Danish Gambit: 1.e4 e5 2.d4 exd4 3.c3
• Danish Gambit Declined: Sorensen Defense: 1.e4 e5 2.d4 exd4 3.c3 d5
• Danish Gambit Accepted: 1.e4 e5 2.d4 exd4 3.c3 dxc3
• Danish Gambit Accepted: Copenhagen Defense: 1.e4 e5 2.d4 exd4 3.c3 dxc3 4.Bc4 cxb2 5.Bxb2 Bb4+
• Danish Gambit Accepted: Schlechter Defense: 1.e4 e5 2.d4 exd4 3.c3 dxc3 4.Bc4 cxb2 5.Bxb2 d5
• Danish Gambit Accepted: Classical Defense: 1.e4 e5 2.d4 exd4 3.c3 dxc3 4.Bc4 cxb2 5.Bxb2 Nf6
• Danish Gambit Accepted: Chigorin Defense: 1.e4 e5 2.d4 exd4 3.c3 dxc3 4.Bc4 cxb2 5.Bxb2 Qe7
• Danish Gambit Accepted: Svenonius Defense: 1.e4 e5 2.d4 exd4 3.c3 Ne7
• Center Game: Halasz-McDonnell Gambit: 1.e4 e5 2.d4 exd4 3.f4
• Center Game: Halasz-McDonnell Gambit, Crocodile Variation: 1.e4 e5 2.d4 exd4 3.f4 Bc5 4.Nf3 Nc6 5.c3
• Center Game: Kieseritzky Variation: 1.e4 e5 2.d4 exd4 3.Nf3
• Center Game: Lanc-Arnold Gambit: 1.e4 e5 2.d4 exd4 3.Nf3 Bc5 4.c3
• Center Game: Lanc-Arnold Gambit, Schippler Gambit: 1.e4 e5 2.d4 exd4 3.Nf3 Bc5 4.c3 dxc3 5.Bc4
• Center Game: Kieseritzky Variation: 1.e4 e5 2.d4 exd4 3.Nf3 c5
• Center Game: Kieseritzky Variation: 1.e4 e5 2.d4 exd4 3.Nf3 c5 4.Bc4
• Center Game: 1.e4 e5 2.d4 exd4 3.Qxd4

• C22 Center Game
• Center Game: Normal Variation: 1.e4 e5 2.d4 exd4 3.Qxd4 Nc6
• Center Game: Hall Variation: 1.e4 e5 2.d4 exd4 3.Qxd4 Nc6 4.Qc4
• Center Game: Paulsen Attack Variation: 1.e4 e5 2.d4 exd4 3.Qxd4 Nc6 4.Qe3
• Center Game: Charousek Variation: 1.e4 e5 2.d4 exd4 3.Qxd4 Nc6 4.Qe3 Bb4+ 5.c3 Be7
• Center Game: l'Hermet Variation: 1.e4 e5 2.d4 exd4 3.Qxd4 Nc6 4.Qe3 f5
• Center Game: Berger Variation: 1.e4 e5 2.d4 exd4 3.Qxd4 Nc6 4.Qe3 Nf6
• Center Game: Kupreichik Variation: 1.e4 e5 2.d4 exd4 3.Qxd4 Nc6 4.Qe3 Nf6 5.Nc3 Bb4 6.Bd2 0-0 7.0-0-0 Re8 8.Bc4 d6 9.Nh3

• C23 Bishop's Opening
• Bishop's Opening: 1.e4 e5 2.Bc4
• Bishop's Opening: Anderssen Gambit: 1.e4 e5 2.Bc4 b5 3.Bxb5 c6
• Bishop's Opening: Thorold Gambit: 1.e4 e5 2.Bc4 b5 3.Bxb5 f5
• Bishop's Opening: Boi Variation: 1.e4 e5 2.Bc4 Bc5
• Bishop's Opening: McDonnell Gambit: 1.e4 e5 2.Bc4 Bc5 3.b4
• Bishop's Opening: McDonnell Gambit, La Bourdonnais-Denker Gambit: 1.e4 e5 2.Bc4 Bc5 3.b4 Bxb4 4.c3
• Bishop's Opening: McDonnell Gambit, McDonnell Double Gambit: 1.e4 e5 2.Bc4 Bc5 3.b4 Bxb4 4.f4
• Bishop's Opening: Four Pawns Gambit: 1.e4 e5 2.Bc4 Bc5 3.b4 Bxb4 4.f4 exf4 5.Nf3 Be7 6.d4 Bh4+ 7.g3 fxg3 8.0-0 gxh2+ 9.Kh1
• Bishop's Opening: Philidor Variation: 1.e4 e5 2.Bc4 Bc5 3.c3
• Bishop's Opening: Lewis Countergambit: 1.e4 e5 2.Bc4 Bc5 3.c3 d5
• Bishop's Opening: Lewis Countergambit: 1.e4 e5 2.Bc4 Bc5 3.c3 d5 4.Bxd5 Nf6
• Bishop's Opening: Lewis Countergambit, Walker Variation: 1.e4 e5 2.Bc4 Bc5 3.c3 d5 4.Bxd5 Nf6 5.d4
• Bishop's Opening: Pratt Variation: 1.e4 e5 2.Bc4 Bc5 3.c3 Nf6 4.d4 exd4 5.e5 d5 6.exf6 dxc4 7.Qh5 0-0
• Bishop's Opening: del Rio Variation: 1.e4 e5 2.Bc4 Bc5 3.c3 Qg5
• Bishop's Opening: Lewis Gambit: 1.e4 e5 2.Bc4 Bc5 3.d4
• Bishop's Opening: Stein Gambit: 1.e4 e5 2.Bc4 Bc5 3.f4
• Bishop's Opening: Lopez Variation: 1.e4 e5 2.Bc4 Bc5 3.Qe2
• Bishop's Opening: Lopez Gambit: 1.e4 e5 2.Bc4 Bc5 3.Qe2 Nc6 4.c3 Nf6 5.f4
• Bishop's Opening: Lopez Variation, Lopez Gambit: 1.e4 e5 2.Bc4 Bc5 3.Qe2 Nf6 4.f4
• Bishop's Opening: Philidor Counterattack: 1.e4 e5 2.Bc4 c6
• Bishop's Opening: Lisitsyn Variation: 1.e4 e5 2.Bc4 c6 3.d4 d5 4.exd5 cxd5 5.Bb5+ Bd7 6.Bxd7+ Nxd7 7.dxe5 Nxe5 8.Ne2
• Bishop's Opening: Khan Gambit: 1.e4 e5 2.Bc4 d5
• Bishop's Opening: Calabrese Countergambit: 1.e4 e5 2.Bc4 f5
• Bishop's Opening: Calabrese Countergambit, Jaenisch Variation: 1.e4 e5 2.Bc4 f5 3.d3

• C24 Bishop's Opening, Berlin Defence
• Bishop's Opening: Berlin Defense: 1.e4 e5 2.Bc4 Nf6
• Bishop's Opening: Kitchener Folly: 1.e4 e5 2.Bc4 Nf6 3.d3 Be7 4.Nf3 0-0
• Bishop's Opening: Vienna Hybrid: 1.e4 e5 2.Bc4 Nf6 3.d3 Nc6 4.Nc3
• Bishop's Opening: Ponziani Gambit: 1.e4 e5 2.Bc4 Nf6 3.d4
• Bishop's Opening: Warsaw Gambit: 1.e4 e5 2.Bc4 Nf6 3.d4 exd4 4.c3
• Bishop's Opening: Urusov Gambit, Panov Variation: 1.e4 e5 2.Bc4 Nf6 3.d4 exd4 4.Nf3 d5 5.exd5 Bb4+ 6.c3 Qe7+
• Bishop's Opening: Krejcik Gambit: 1.e4 e5 2.Bc4 Nf6 3.f3 Bc5 4.Ne2 Nc6 5.b4
• Bishop's Opening: Berlin Defense, Greco Gambit: 1.e4 e5 2.Bc4 Nf6 3.f4
• Bishop's Opening: Pachman Gambit: 1.e4 e5 2.Bc4 Nf6 3.Ne2 Nxe4 4.Nec3

• C25 Vienna Game
• Vienna Gambit, with Max Lange Defense: Hamppe-Allgaier Gambit, Thorold Variation: 1.e4 e5 2.f4 exf4 3.Nf3 Nc6 4.Nc3 g5 5.h4 g4 6.Ng5 h6 7.Nxf7 Kxf7 8.d4
• Vienna Game: 1.e4 e5 2.Nc3
• Vienna Game: Zhuravlev Countergambit: 1.e4 e5 2.Nc3 Bb4 3.Qg4 Nf6
• Vienna Game: Anderssen Defense: 1.e4 e5 2.Nc3 Bc5
• Vienna Game: Hamppe-Meitner Variation: 1.e4 e5 2.Nc3 Bc5 3.Na4
• Vienna Game: Giraffe Attack: 1.e4 e5 2.Nc3 Bc5 3.Qg4
• Vienna Game: Omaha Gambit: 1.e4 e5 2.Nc3 d6 3.f4
• Vienna Game: Max Lange Defense: 1.e4 e5 2.Nc3 Nc6
• Vienna Game: Stanley Variation, Meitner-Mieses Gambit: 1.e4 e5 2.Nc3 Nc6 3.Bc4 Bc5 4.Qg4 Qf6 5.Nd5
• Vienna Game: Fyfe Gambit: 1.e4 e5 2.Nc3 Nc6 3.d4
• Vienna Game: Philidor Countergambit: 1.e4 e5 2.Nc3 Nc6 3.d4 f5
• Vienna Gambit, with Max Lange Defense: 1.e4 e5 2.Nc3 Nc6 3.f4
• Vienna Gambit, with Max Lange Defense: Quelle Gambit: 1.e4 e5 2.Nc3 Nc6 3.f4 Bc5 4.fxe5 d6
• Vienna Gambit, with Max Lange Defense: Steinitz Gambit: 1.e4 e5 2.Nc3 Nc6 3.f4 exf4 4.d4
• Vienna Gambit, with Max Lange Defense: Steinitz Gambit, Main Line: 1.e4 e5 2.Nc3 Nc6 3.f4 exf4 4.d4 Qh4+ 5.Ke2
• Vienna Gambit, with Max Lange Defense: Steinitz Gambit, Fraser-Minckwitz Defense: 1.e4 e5 2.Nc3 Nc6 3.f4 exf4 4.d4 Qh4+ 5.Ke2 b6
• Vienna Gambit, with Max Lange Defense: Steinitz Gambit, Zukertort Defense: 1.e4 e5 2.Nc3 Nc6 3.f4 exf4 4.d4 Qh4+ 5.Ke2 d5
• Vienna Gambit, with Max Lange Defense: Steinitz Gambit, Paulsen Defense: 1.e4 e5 2.Nc3 Nc6 3.f4 exf4 4.d4 Qh4+ 5.Ke2 d6
• Vienna Gambit, with Max Lange Defense: Steinitz Gambit, Sörensen Defense: 1.e4 e5 2.Nc3 Nc6 3.f4 exf4 4.d4 Qh4+ 5.Ke2 g5
• Vienna Gambit, with Max Lange Defense: Knight Variation: 1.e4 e5 2.Nc3 Nc6 3.f4 exf4 4.Nf3
• Vienna Gambit, with Max Lange Defense: Cunningham Defense: 1.e4 e5 2.Nc3 Nc6 3.f4 exf4 4.Nf3 Be7
• Vienna Game: Hamppe-Muzio Gambit: 1.e4 e5 2.Nc3 Nc6 3.f4 exf4 4.Nf3 g5 5.Bc4 g4 6.0-0
• Vienna Gambit, with Max Lange Defense: Hamppe-Muzio Gambit: 1.e4 e5 2.Nc3 Nc6 3.f4 exf4 4.Nf3 g5 5.Bc4 g4 6.0-0 gxf3
• Vienna Game: Hamppe-Muzio, Dubois Variation: 1.e4 e5 2.Nc3 Nc6 3.f4 exf4 4.Nf3 g5 5.Bc4 g4 6.0-0 gxf3 7.Qxf3 Ne5 8.Qxf4 Qf6
• Vienna Gambit, with Max Lange Defense: Pierce Gambit: 1.e4 e5 2.Nc3 Nc6 3.f4 exf4 4.Nf3 g5 5.d4
• Vienna Game: Pierce Gambit, Rushmere Attack: 1.e4 e5 2.Nc3 Nc6 3.f4 exf4 4.Nf3 g5 5.d4 g4 6.Bc4 gxf3 7.0-0 d5 8.exd5 Bg4 9.dxc6
• Vienna Gambit, with Max Lange Defense: Hamppe-Allgaier Gambit: 1.e4 e5 2.Nc3 Nc6 3.f4 exf4 4.Nf3 g5 5.h4 g4 6.Ng5
• Vienna Gambit, with Max Lange Defense: Hamppe-Allgaier Gambit, Alapin Variation: 1.e4 e5 2.Nc3 Nc6 3.f4 exf4 4.Nf3 g5 5.h4 g4 6.Ng5 d6
• Vienna Game: Paulsen Variation: 1.e4 e5 2.Nc3 Nc6 3.g3
• Vienna Game: Paulsen Variation, Mariotti Gambit: 1.e4 e5 2.Nc3 Nc6 3.g3 Bc5 4.Bg2 h5 5.Nf3 h4
• Vienna Game: Paulsen Variation: 1.e4 e5 2.Nc3 Nc6 3.g3 Nf6 4.Bg2 Bc5 5.Nge2 d5

• C26 Vienna Game, Falkbeer Variation
• Bishop's Opening: Horwitz Gambit: 1.e4 e5 2.Bc4 Nf6 3.Nc3 b5
• Vienna Game: Falkbeer Variation: 1.e4 e5 2.Nc3 Nf6
• Vienna Game: Mengarini Variation: 1.e4 e5 2.Nc3 Nf6 3.a3
• Vienna Game: Stanley Variation: 1.e4 e5 2.Nc3 Nf6 3.Bc4
• Vienna Game: Stanley Variation, Reversed Spanish: 1.e4 e5 2.Nc3 Nf6 3.Bc4 Bb4
• Bishop's Opening: Vienna Hybrid, Spielmann Attack: 1.e4 e5 2.Nc3 Nf6 3.Bc4 Bc5 4.d3
• Vienna Game: Stanley Variation, Eifel Gambit: 1.e4 e5 2.Nc3 Nf6 3.Bc4 Bc5 4.Nge2 b5
• Vienna Game: Mieses Variation: 1.e4 e5 2.Nc3 Nf6 3.g3
• Vienna Game: Paulsen Variation, Pollock Gambit: 1.e4 e5 2.Nc3 Nf6 3.g3 Bc5 4.Bg2 Nc6 5.Nge2 d5 6.exd5
• Vienna Game: Mieses Variation, Erben Gambit: 1.e4 e5 2.Nc3 Nf6 3.g3 d5 4.exd5 c6

• C27 Vienna Game, Frankenstein–Dracula Variation
• Vienna Game: Frankenstein-Dracula Variation: 1.e4 e5 2.Nc3 Nf6 3.Bc4 Nxe4
• Vienna Game: Stanley Variation, Monster Declined: 1.e4 e5 2.Nc3 Nf6 3.Bc4 Nxe4 4.Qh5 Nd6 5.Bb3 Be7
• Vienna Game: Stanley Variation, Alekhine Variation: 1.e4 e5 2.Nc3 Nf6 3.Bc4 Nxe4 4.Qh5 Nd6 5.Bb3 Be7 6.Nf3 Nc6 7.Nxe5
• Vienna Game: Adams' Gambit: 1.e4 e5 2.Nc3 Nf6 3.Bc4 Nxe4 4.Qh5 Nd6 5.Bb3 Nc6 6.d4
• Vienna Game: Stanley Variation, Frankenstein-Dracula Variation: 1.e4 e5 2.Nc3 Nf6 3.Bc4 Nxe4 4.Qh5 Nd6 5.Bb3 Nc6 6.Nb5 g6 7.Qf3 f5 8.Qd5 Qe7 9.Nxc7+ Kd8 10.Nxa8 b6
• Bishop's Opening: Boden-Kieseritzky Gambit: 1.e4 e5 2.Nf3 Nf6 3.Bc4 Nxe4 4.Nc3
• Bishop's Opening: Boden-Kieseritzky Gambit, Lichtenhein Defense: 1.e4 e5 2.Nf3 Nf6 3.Bc4 Nxe4 4.Nc3 d5

• C28 Vienna Game
• Vienna Game: Stanley Variation, Three Knights Variation: 1.e4 e5 2.Nc3 Nc6 3.Bc4 Nf6
• Bishop's Opening: Vienna Hybrid, Hromádka Variation: 1.e4 e5 2.Nc3 Nc6 3.Bc4 Nf6 4.d3 Bb4 5.Ne2
• Vienna Game: Stanley Variation, Bronstein Gambit: 1.e4 e5 2.Nc3 Nc6 3.Bc4 Nf6 4.f4 Nxe4 5.Nf3

• C29 Vienna Gambit, Kaufmann Variation including Würzburger Trap
• Vienna Game: Vienna Gambit: 1.e4 e5 2.Nc3 Nf6 3.f4
• Vienna Game: Vienna Gambit, Main Line: 1.e4 e5 2.Nc3 Nf6 3.f4 d5
• Vienna Game: Vienna Gambit, Steinitz Variation: 1.e4 e5 2.Nc3 Nf6 3.f4 d5 4.d3
• Vienna Game: Vienna Gambit, Modern Variation: 1.e4 e5 2.Nc3 Nf6 3.f4 d5 4.fxe5 Nxe4 5.d3
• Vienna Game: Vienna Gambit, Wurzburger Trap: 1.e4 e5 2.Nc3 Nf6 3.f4 d5 4.fxe5 Nxe4 5.d3 Qh4+ 6.g3 Nxg3 7.Nf3 Qh5 8.Nxd5
• Vienna Game: Vienna Gambit, Breyer Variation: 1.e4 e5 2.Nc3 Nf6 3.f4 d5 4.fxe5 Nxe4 5.Nf3 Be7
• Vienna Game: Vienna Gambit, Kaufmann Variation: 1.e4 e5 2.Nc3 Nf6 3.f4 d5 4.fxe5 Nxe4 5.Nf3 Bg4 6.Qe2
• Vienna Game: Vienna Gambit, Paulsen Attack: 1.e4 e5 2.Nc3 Nf6 3.f4 d5 4.fxe5 Nxe4 5.Qf3
• Vienna Game: Vienna Gambit, Bardeleben Variation: 1.e4 e5 2.Nc3 Nf6 3.f4 d5 4.fxe5 Nxe4 5.Qf3 f5
• Vienna Game: Heyde Variation: 1.e4 e5 2.Nc3 Nf6 3.f4 d5 4.fxe5 Nxe4 5.Qf3 f5 6.d4

• C30 King's Gambit
• King's Gambit Declined: Mafia Defense: 1.e4 c5 2.f4 e5
• King's Gambit Declined: Classical, Svenonius Variation: 1.e4 e5 2.Bc4 Nc6 3.Nc3 Nf6 4.d3 Bc5 5.f4 d6 6.Nf3 Bg4 7.h3 Bxf3 8.Qxf3 exf4
• King's Gambit: 1.e4 e5 2.f4
• King's Gambit Declined: Classical Variation: 1.e4 e5 2.f4 Bc5
• King's Gambit Declined: Classical Variation, Rotlewi Countergambit: 1.e4 e5 2.f4 Bc5 3.Nf3 d6 4.b4
• King's Gambit Declined: Classical Variation: 1.e4 e5 2.f4 Bc5 3.Nf3 d6 4.c3
• King's Gambit Declined: Classical Variation, Euwe Attack: 1.e4 e5 2.f4 Bc5 3.Nf3 d6 4.c3 Bg4 5.fxe5 dxe5 6.Qa4+
• King's Gambit Declined: Classical Variation, Rubinstein Countergambit: 1.e4 e5 2.f4 Bc5 3.Nf3 d6 4.c3 f5
• King's Gambit Declined: Classical, Réti Variation: 1.e4 e5 2.f4 Bc5 3.Nf3 d6 4.c3 f5 5.fxe5 dxe5 6.d4 exd4 7.Bc4
• King's Gambit Declined: Classical, Soldatenkov Variation: 1.e4 e5 2.f4 Bc5 3.Nf3 d6 4.fxe5
• King's Gambit Declined: Classical, Hanham Variation: 1.e4 e5 2.f4 Bc5 3.Nf3 d6 4.Nc3 Nd7
• King's Gambit Declined: Senechaud Countergambit: 1.e4 e5 2.f4 Bc5 3.Nf3 g5
• King's Gambit Declined: Panteldakis Countergambit: 1.e4 e5 2.f4 f5
• King's Gambit Declined: Panteldakis Countergambit, Schiller's Defense: 1.e4 e5 2.f4 f5 3.exf5 Bc5
• King's Gambit Declined: Panteldakis Countergambit, Symmetrical Variation: 1.e4 e5 2.f4 f5 3.exf5 exf4 4.Nf3 d5 5.d4 Bd6 6.Bd3
• King's Gambit Declined: Panteldakis Countergambit, Pawn Sacrifice Line: 1.e4 e5 2.f4 f5 3.exf5 exf4 4.Qh5+ g6 5.fxg6 Qe7+ 6.Kd1
• King's Gambit Declined: Panteldakis Countergambit, Shirazi Line: 1.e4 e5 2.f4 f5 3.exf5 exf4 4.Qh5+ Ke7
• King's Gambit Declined: Panteldakis Countergambit, Greco Variation: 1.e4 e5 2.f4 f5 3.exf5 Qh4+
• King's Gambit Declined: Soller-Zilbermints Gambit: 1.e4 e5 2.f4 f6 3.fxe5 Nc6
• King's Gambit Declined: Zilbermints Double Countergambit: 1.e4 e5 2.f4 g5
• King's Gambit Declined: Queen's Knight Defense: 1.e4 e5 2.f4 Nc6
• King's Gambit Declined: Miles Defense: 1.e4 e5 2.f4 Nc6 3.Nf3 f5
• King's Gambit Declined: Zilbermints Double Gambit: 1.e4 e5 2.f4 Nc6 3.Nf3 g5
• King's Gambit Declined: Hobbs-Zilbermints Gambit: 1.e4 e5 2.f4 Nc6 3.Nf3 g5 4.fxg5 h6
• King's Gambit Declined: Petrov's Defense: 1.e4 e5 2.f4 Nf6
• King's Gambit Declined: Norwalde Variation: 1.e4 e5 2.f4 Qf6
• King's Gambit Declined: Norwalde Variation, Schubert Variation: 1.e4 e5 2.f4 Qf6 3.Nc3 Qxf4 4.d4
• King's Gambit Declined: Norwalde Variation, Bücker Gambit: 1.e4 e5 2.f4 Qf6 3.Nc3 Qxf4 4.Nf3 Bb4 5.Bc4
• King's Gambit Declined: Keene's Defense: 1.e4 e5 2.f4 Qh4+
• King's Gambit Declined: Keene's Defense: 1.e4 e5 2.f4 Qh4+ 3.g3
• King's Gambit Declined: Keene Defense: 1.e4 e5 2.f4 Qh4+ 3.g3 Qe7

• C31 King's Gambit Declined, Falkbeer and Nimzowitsch (3...c6) Countergambits
• King's Gambit Declined: Falkbeer Countergambit: 1.e4 e5 2.f4 d5
• King's Gambit Declined: Falkbeer Countergambit, Hinrichsen Gambit: 1.e4 e5 2.f4 d5 3.d4
• King's Gambit Declined: Falkbeer Countergambit Accepted: 1.e4 e5 2.f4 d5 3.exd5
• King's Gambit Declined: Falkbeer Countergambit, Miles Gambit: 1.e4 e5 2.f4 d5 3.exd5 Bc5
• King's Gambit Declined: Falkbeer Countergambit, Nimzowitsch-Marshall Countergambit: 1.e4 e5 2.f4 d5 3.exd5 c6
• King's Gambit Declined: Falkbeer Countergambit, Pickler Gambit: 1.e4 e5 2.f4 d5 3.exd5 c6 4.dxc6 Bc5
• King's Gambit Declined: Falkbeer Countergambit, Staunton Line: 1.e4 e5 2.f4 d5 3.exd5 e4
• King's Gambit Declined: Falkbeer Countergambit, Anderssen Attack: 1.e4 e5 2.f4 d5 3.exd5 e4 4.Bb5+
• King's Gambit Declined: Falkbeer Countergambit, Charousek Gambit: 1.e4 e5 2.f4 d5 3.exd5 e4 4.d3
• King's Gambit Declined: Falkbeer Countergambit, Rubinstein Variation: 1.e4 e5 2.f4 d5 3.exd5 e4 4.Nc3 Nf6 5.Qe2
• King's Gambit Declined: Falkbeer Countergambit, Modern Transfer: 1.e4 e5 2.f4 d5 3.exd5 exf4
• King's Gambit Declined: Falkbeer Countergambit, Milner-Barry Variation: 1.e4 e5 2.f4 d5 3.Nc3
• Van Geet Opening: Grünfeld Defense, Steiner Gambit: 1.e4 e5 2.f4 d5 3.Nc3 dxe4 4.Nxe4
• King's Gambit Declined: Falkbeer Countergambit, Blackburne Attack: 1.e4 e5 2.f4 d5 3.Nf3
• King's Gambit Declined: Falkbeer Countergambit, Charousek Gambit, Morphy Defense: 1.e4 e5 2.Nc3 Nf6 3.f4 d5 4.exd5 e4 5.d3 Bb4 6.Bd2 e3

• C32 King's Gambit Declined, Falkbeer, 5.dxe4
• King's Gambit Declined: Falkbeer Countergambit, Charousek Gambit Accepted: 1.e4 e5 2.f4 d5 3.exd5 e4 4.d3 Nf6 5.dxe4
• King's Gambit Declined: Falkbeer Countergambit, Alapin Variation: 1.e4 e5 2.f4 d5 3.exd5 e4 4.d3 Nf6 5.dxe4 Nxe4 6.Nf3 Bc5 7.Qe2 Bf2+ 8.Kd1 Qxd5+ 9.Nfd2
• King's Gambit Declined: Falkbeer Countergambit, Charousek Gambit, Main Line: 1.e4 e5 2.f4 d5 3.exd5 e4 4.d3 Nf6 5.dxe4 Nxe4 6.Nf3 Bc5 7.Qe2 Bf5
• King's Gambit Declined: Falkbeer Countergambit, Tarrasch Variation: 1.e4 e5 2.f4 d5 3.exd5 e4 4.d3 Nf6 5.dxe4 Nxe4 6.Nf3 Bc5 7.Qe2 Bf5 8.g4 0-0
• King's Gambit Declined: Falkbeer Countergambit, Charousek Gambit: 1.e4 e5 2.f4 d5 3.exd5 e4 4.d3 Nf6 5.dxe4 Nxe4 6.Qe2
• King's Gambit Declined: Falkbeer Countergambit, Charousek Variation: 1.e4 e5 2.f4 d5 3.exd5 e4 4.d3 Nf6 5.dxe4 Nxe4 6.Qe2 Qxd5 7.Nd2 f5 8.g4
• King's Gambit Declined: Falkbeer Countergambit, Charousek Gambit, Keres Variation: 1.e4 e5 2.f4 d5 3.exd5 e4 4.d3 Nf6 5.Nd2
• King's Gambit Declined: Falkbeer Countergambit, Charousek Gambit, Old Line: 1.e4 e5 2.f4 d5 3.exd5 e4 4.d3 Nf6 5.Qe2

• C33 King's Gambit Accepted
• King's Gambit Accepted: 1.e4 e5 2.f4 exf4
• King's Gambit Accepted: Orsini Gambit: 1.e4 e5 2.f4 exf4 3.b3
• King's Gambit Accepted: Schurig Gambit, with Bb5: 1.e4 e5 2.f4 exf4 3.Bb5
• King's Gambit Accepted: Bishop's Gambit: 1.e4 e5 2.f4 exf4 3.Bc4
• King's Gambit Accepted: Bishop's Gambit, Kieseritzky Gambit: 1.e4 e5 2.f4 exf4 3.Bc4 b5
• King's Gambit Accepted: Bishop's Gambit, Lopez Defense: 1.e4 e5 2.f4 exf4 3.Bc4 c6
• King's Gambit Accepted: Bishop's Gambit, Bledow Variation: 1.e4 e5 2.f4 exf4 3.Bc4 d5
• King's Gambit Accepted: Bishop's Gambit, Anderssen Variation: 1.e4 e5 2.f4 exf4 3.Bc4 d5 4.Bxd5 c6
• King's Gambit Accepted: Bishop's Gambit, Bledow Countergambit: 1.e4 e5 2.f4 exf4 3.Bc4 d5 4.Bxd5 Nf6
• King's Gambit Accepted: Bishop's Gambit, Boren-Svenonius Variation: 1.e4 e5 2.f4 exf4 3.Bc4 d5 4.Bxd5 Qh4+ 5.Kf1 Bd6
• King's Gambit Accepted: Bishop's Gambit, Gianutio Gambit: 1.e4 e5 2.f4 exf4 3.Bc4 f5
• King's Gambit Accepted: Lopez-Gianutio Countergambit, Hein Variation: 1.e4 e5 2.f4 exf4 3.Bc4 f5 4.Qe2 Qh4+ 5.Kd1 fxe4 6.Nc3 Kd8
• King's Gambit Accepted: Bishop's Gambit, Anderssen Defense: 1.e4 e5 2.f4 exf4 3.Bc4 g5
• King's Gambit Accepted: Bishop's Gambit, Maurian Defense: 1.e4 e5 2.f4 exf4 3.Bc4 Nc6
• King's Gambit Accepted: Bishop's Gambit, Steinitz Defense: 1.e4 e5 2.f4 exf4 3.Bc4 Ne7
• King's Gambit Accepted: Bishop's Gambit, Cozio Defense: 1.e4 e5 2.f4 exf4 3.Bc4 Nf6
• King's Gambit Accepted: Bishop's Gambit, Bogoljubow Variation: 1.e4 e5 2.f4 exf4 3.Bc4 Nf6 4.Nc3
• King's Gambit Accepted: Bishop's Gambit, Paulsen Attack: 1.e4 e5 2.f4 exf4 3.Bc4 Nf6 4.Nc3 Bb4 5.e5
• King's Gambit Accepted: Bishop's Gambit, Bogoljubow Defense: 1.e4 e5 2.f4 exf4 3.Bc4 Nf6 4.Nc3 c6
• King's Gambit Accepted: Bishop's Gambit, Bryan Countergambit: 1.e4 e5 2.f4 exf4 3.Bc4 Qh4+ 4.Kf1 b5
• King's Gambit Accepted: Bishop's Gambit, Greco Variation: 1.e4 e5 2.f4 exf4 3.Bc4 Qh4+ 4.Kf1 Bc5
• King's Gambit Accepted: Bishop's Gambit, Chigorin's Attack: 1.e4 e5 2.f4 exf4 3.Bc4 Qh4+ 4.Kf1 d5 5.Bxd5 g5 6.g3
• King's Gambit Accepted: Bishop's Gambit, Cozio Variation: 1.e4 e5 2.f4 exf4 3.Bc4 Qh4+ 4.Kf1 d6
• King's Gambit Accepted: Bishop's Gambit, Lopez Variation: 1.e4 e5 2.f4 exf4 3.Bc4 Qh4+ 4.Kf1 g5
• King's Gambit Accepted: Bishop's Gambit, Grimm Attack: 1.e4 e5 2.f4 exf4 3.Bc4 Qh4+ 4.Kf1 g5 5.Nc3 Bg7 6.d4 d6 7.e5
• King's Gambit Accepted: Bishop's Gambit, McDonnell Attack: 1.e4 e5 2.f4 exf4 3.Bc4 Qh4+ 4.Kf1 g5 5.Nc3 Bg7 6.d4 Ne7 7.g3
• King's Gambit Accepted: Bishop's Gambit, McDonnell Attack: 1.e4 e5 2.f4 exf4 3.Bc4 Qh4+ 4.Kf1 g5 5.Nc3 Bg7 6.g3
• King's Gambit Accepted: Bishop's Gambit, Fraser Variation: 1.e4 e5 2.f4 exf4 3.Bc4 Qh4+ 4.Kf1 g5 5.Nc3 Bg7 6.g3 fxg3 7.Qf3
• King's Gambit Accepted: Bishop's Gambit, Classical Defense, Cozio Attack: 1.e4 e5 2.f4 exf4 3.Bc4 Qh4+ 4.Kf1 g5 5.Qf3
• King's Gambit Accepted: Bishop's Gambit, Boden Variation: 1.e4 e5 2.f4 exf4 3.Bc4 Qh4+ 4.Kf1 Nc6
• King's Gambit Accepted: Bishop's Gambit, Classical Defense: 1.e4 e5 2.f4 exf4 3.Bc4 Qh4+ 4.Kf1 Ne7 5.Nc3 g5 6.d4 Bg7
• King's Gambit Accepted: Bishop's Gambit, First Jaenisch Variation: 1.e4 e5 2.f4 exf4 3.Bc4 Qh4+ 4.Kf1 Nf6
• King's Gambit Accepted: Schurig Gambit, with Bd3: 1.e4 e5 2.f4 exf4 3.Bd3
• King's Gambit Accepted: Tartakower Gambit: 1.e4 e5 2.f4 exf4 3.Be2
• King's Gambit Accepted: Tartakower Gambit, Weiss Defense: 1.e4 e5 2.f4 exf4 3.Be2 f5 4.exf5 d6
• King's Gambit Accepted: Polerio Gambit: 1.e4 e5 2.f4 exf4 3.d4
• King's Gambit Accepted: Gaga Gambit: 1.e4 e5 2.f4 exf4 3.g3
• King's Gambit Accepted: Stamma Gambit: 1.e4 e5 2.f4 exf4 3.h4
• King's Gambit Accepted: Tumbleweed: 1.e4 e5 2.f4 exf4 3.Kf2
• King's Gambit Accepted: Mason-Keres Gambit: 1.e4 e5 2.f4 exf4 3.Nc3
• King's Gambit Accepted: Paris Gambit: 1.e4 e5 2.f4 exf4 3.Ne2
• King's Gambit Accepted: Eisenberg Variation: 1.e4 e5 2.f4 exf4 3.Nh3
• King's Gambit Accepted: Basman Gambit: 1.e4 e5 2.f4 exf4 3.Qe2
• King's Gambit Accepted: Breyer Gambit: 1.e4 e5 2.f4 exf4 3.Qf3
• King's Gambit Accepted: Dodo Variation: 1.e4 e5 2.f4 exf4 3.Qg4
• King's Gambit Accepted: Carrera Gambit: 1.e4 e5 2.f4 exf4 3.Qh5

• C34 King's Gambit Accepted, including Fischer Defence
• King's Gambit Accepted: King's Knight's Gambit: 1.e4 e5 2.f4 exf4 3.Nf3
• King's Gambit Accepted: Fischer Defense: 1.e4 e5 2.f4 exf4 3.Nf3 d6
• King's Gambit Accepted: Fischer Defense, Schulder Gambit: 1.e4 e5 2.f4 exf4 3.Nf3 d6 4.b4
• King's Gambit Accepted: Greco Gambit: 1.e4 e5 2.f4 exf4 3.Nf3 d6 4.Bc4 h6 5.d4 g5 6.h4 Bg7
• King's Gambit Accepted: Fischer Defense, Spanish Variation: 1.e4 e5 2.f4 exf4 3.Nf3 d6 4.d4 Nf6 5.Bd3
• King's Gambit Accepted: Gianutio Countergambit: 1.e4 e5 2.f4 exf4 3.Nf3 f5
• King's Gambit Accepted: King's Knight's Gambit: 1.e4 e5 2.f4 exf4 3.Nf3 g5
• King's Gambit Accepted: Wagenbach Defense: 1.e4 e5 2.f4 exf4 3.Nf3 h5
• King's Gambit Accepted: Becker Defense: 1.e4 e5 2.f4 exf4 3.Nf3 h6
• King's Gambit Accepted: MacLeod Defense: 1.e4 e5 2.f4 exf4 3.Nf3 Nc6
• King's Gambit Accepted: Bonsch-Osmolovsky Variation: 1.e4 e5 2.f4 exf4 3.Nf3 Ne7
• King's Gambit Accepted: Schallopp Defense: 1.e4 e5 2.f4 exf4 3.Nf3 Nf6
• King's Gambit Accepted: Schallopp Defense, Tashkent Attack: 1.e4 e5 2.f4 exf4 3.Nf3 Nf6 4.e5 Nh5 5.g4

• C35 King's Gambit Accepted, Cunningham Defence
• King's Gambit Accepted: Cunningham Defense: 1.e4 e5 2.f4 exf4 3.Nf3 Be7
• King's Gambit Accepted: Cunningham Defense, Bertin Gambit: 1.e4 e5 2.f4 exf4 3.Nf3 Be7 4.Bc4 Bh4+ 5.g3
• King's Gambit Accepted: Cunningham Defense, Bertin Gambit: 1.e4 e5 2.f4 exf4 3.Nf3 Be7 4.Bc4 Bh4+ 5.g3 fxg3 6.0-0 gxh2+ 7.Kh1
• King's Gambit Accepted: Cunningham Defense, McCormick Defense: 1.e4 e5 2.f4 exf4 3.Nf3 Be7 4.Bc4 Nf6

• C36 King's Gambit Accepted, Abbazia Defence (Classical Defence, Modern Defence)
• King's Gambit Accepted: Modern Defense: 1.e4 e5 2.f4 exf4 3.Nf3 d5
• King's Gambit Accepted: Modern Defense: 1.e4 e5 2.f4 exf4 3.Nf3 d5 4.exd5
• King's Gambit Accepted: Abbazia Defense: 1.e4 e5 2.f4 exf4 3.Nf3 d5 4.exd5 Nf6
• King's Gambit Accepted: Abbazia Defense, Main Line: 1.e4 e5 2.f4 exf4 3.Nf3 d5 4.exd5 Nf6 5.Bb5+ c6 6.dxc6 bxc6 7.Bc4 Nd5

• C37 King's Gambit Accepted, Quaade Gambit McDonnell Gambit, or Muzio Gambit
• King's Gambit Accepted: King's Knight's Gambit: 1.e4 e5 2.f4 exf4 3.Nf3 g5 4.Bc4
• King's Gambit Accepted: Middleton Countergambit: 1.e4 e5 2.f4 exf4 3.Nf3 g5 4.Bc4 d6 5.0-0 Bg4 6.h3 h5 7.hxg4 hxg4
• King's Gambit Accepted: Lolli Gambit: 1.e4 e5 2.f4 exf4 3.Nf3 g5 4.Bc4 g4 5.Bxf7+
• King's Gambit Accepted: Lolli Gambit, Young Variation: 1.e4 e5 2.f4 exf4 3.Nf3 g5 4.Bc4 g4 5.Bxf7+ Kxf7 6.0-0 gxf3 7.Qxf3 Qf6 8.d4 Qxd4+ 9.Be3 Qf6 10.Nc3
• King's Gambit Accepted: Ghulam-Kassim Gambit: 1.e4 e5 2.f4 exf4 3.Nf3 g5 4.Bc4 g4 5.d4
• King's Gambit Accepted: Kotov Gambit: 1.e4 e5 2.f4 exf4 3.Nf3 g5 4.Bc4 g4 5.d4 gxf3 6.Bxf4
• King's Gambit Accepted: Ghulam-Kassim Gambit: 1.e4 e5 2.f4 exf4 3.Nf3 g5 4.Bc4 g4 5.d4 gxf3 6.Qxf3
• King's Gambit Accepted: Australian Gambit: 1.e4 e5 2.f4 exf4 3.Nf3 g5 4.Bc4 g4 5.h4
• King's Gambit Accepted: McDonnell Gambit: 1.e4 e5 2.f4 exf4 3.Nf3 g5 4.Bc4 g4 5.Nc3
• King's Gambit Accepted: Salvio Gambit: 1.e4 e5 2.f4 exf4 3.Nf3 g5 4.Bc4 g4 5.Ne5
• King's Gambit Accepted: Salvio Gambit, Cochrane Gambit: 1.e4 e5 2.f4 exf4 3.Nf3 g5 4.Bc4 g4 5.Ne5 Qh4+ 6.Kf1 f3
• King's Gambit Accepted: Salvio Gambit, Viennese Variation: 1.e4 e5 2.f4 exf4 3.Nf3 g5 4.Bc4 g4 5.Ne5 Qh4+ 6.Kf1 Nc6
• King's Gambit Accepted: Salvio Gambit, Santa Maria Defense: 1.e4 e5 2.f4 exf4 3.Nf3 g5 4.Bc4 g4 5.Ne5 Qh4+ 6.Kf1 Nf6
• King's Gambit Accepted: Salvio Gambit, Silberschmidt Defense: 1.e4 e5 2.f4 exf4 3.Nf3 g5 4.Bc4 g4 5.Ne5 Qh4+ 6.Kf1 Nh6
• King's Gambit Accepted: Salvio Gambit, Anderssen Counterattack: 1.e4 e5 2.f4 exf4 3.Nf3 g5 4.Bc4 g4 5.Ne5 Qh4+ 6.Kf1 Nh6 7.d4 d6
• King's Gambit Accepted: Silberschmidt Gambit: 1.e4 e5 2.f4 exf4 3.Nf3 g5 4.Bc4 g4 5.Ne5 Qh4+ 6.Kf1 Nh6 7.d4 f3
• King's Gambit Accepted: Muzio Gambit, Wild Muzio Gambit: 1.e4 e5 2.f4 exf4 3.Nf3 g5 4.Bc4 g4 5.0-0
• King's Gambit Accepted: Muzio Gambit, Brentano Defense: 1.e4 e5 2.f4 exf4 3.Nf3 g5 4.Bc4 g4 5.0-0 d5
• King's Gambit Accepted: Muzio Gambit, Holloway Defense: 1.e4 e5 2.f4 exf4 3.Nf3 g5 4.Bc4 g4 5.0-0 gxf3 6.Qxf3 Nc6
• King's Gambit Accepted: Muzio Gambit Accepted, From's Defense: 1.e4 e5 2.f4 exf4 3.Nf3 g5 4.Bc4 g4 5.0-0 gxf3 6.Qxf3 Qe7
• King's Gambit Accepted: Muzio Gambit, Sarratt Defense: 1.e4 e5 2.f4 exf4 3.Nf3 g5 4.Bc4 g4 5.0-0 gxf3 6.Qxf3 Qf6
• King's Gambit Accepted: Double Muzio Gambit, Young Gambit: 1.e4 e5 2.f4 exf4 3.Nf3 g5 4.Bc4 g4 5.0-0 gxf3 6.Qxf3 Qf6 7.Bxf7+ Kxf7 8.d4 Qxd4+ 9.Be3 Qf6 10.Nc3 fxe3
• King's Gambit Accepted: Double Muzio Gambit: 1.e4 e5 2.f4 exf4 3.Nf3 g5 4.Bc4 g4 5.0-0 gxf3 6.Qxf3 Qf6 7.e5 Qxe5 8.Bxf7+
• King's Gambit Accepted: Double Muzio Gambit, Paulsen Defense: 1.e4 e5 2.f4 exf4 3.Nf3 g5 4.Bc4 g4 5.0-0 gxf3 6.Qxf3 Qf6 7.e5 Qxe5 8.d3 Bh6 9.Nc3 Ne7 10.Bd2 Nbc6 11.Rae1
• King's Gambit Accepted: Double Muzio Gambit, Bello Gambit: 1.e4 e5 2.f4 exf4 3.Nf3 g5 4.Bc4 g4 5.0-0 gxf3 6.Qxf3 Qf6 7.Nc3
• King's Gambit Accepted: Double Muzio Gambit, Baldwin Gambit: 1.e4 e5 2.f4 exf4 3.Nf3 g5 4.Bc4 g4 5.0-0 gxf3 6.Qxf3 Qf6 7.Nc3 Qd4+ 8.Kh1 Qxc4 9.Nd5
• King's Gambit Accepted: Muzio Gambit, Kling and Horwitz Counterattack: 1.e4 e5 2.f4 exf4 3.Nf3 g5 4.Bc4 g4 5.0-0 Qe7
• King's Gambit Accepted: Rosentreter Gambit: 1.e4 e5 2.f4 exf4 3.Nf3 g5 4.d4
• King's Gambit Accepted: Rosentreter Gambit, Testa Variation: 1.e4 e5 2.f4 exf4 3.Nf3 g5 4.d4 g4 5.Bxf4
• King's Gambit Accepted: Rosentreter Gambit, Sörensen Gambit: 1.e4 e5 2.f4 exf4 3.Nf3 g5 4.d4 g4 5.Nc3
• King's Gambit Accepted: Sörensen Gambit: 1.e4 e5 2.f4 exf4 3.Nf3 g5 4.d4 g4 5.Ne5
• King's Gambit Accepted: Rosentreter Gambit, Bird Gambit: 1.e4 e5 2.f4 exf4 3.Nf3 g5 4.d4 g4 5.Ne5 Qh4+ 6.g3
• King's Gambit Accepted: Quaade Gambit: 1.e4 e5 2.f4 exf4 3.Nf3 g5 4.Nc3
• King's Gambit Accepted: Blachly Gambit: 1.e4 e5 2.f4 exf4 3.Nf3 Nc6 4.Bc4 g5

• C38 King's Gambit Accepted
• King's Gambit Accepted: Traditional Variation: 1.e4 e5 2.f4 exf4 3.Nf3 g5 4.Bc4 Bg7
• King's Gambit Accepted: Mayet Gambit: 1.e4 e5 2.f4 exf4 3.Nf3 g5 4.Bc4 Bg7 5.d4 d6 6.c3
• King's Gambit Accepted: Philidor Gambit: 1.e4 e5 2.f4 exf4 3.Nf3 g5 4.Bc4 Bg7 5.h4
• King's Gambit Accepted: Greco Gambit: 1.e4 e5 2.f4 exf4 3.Nf3 g5 4.Bc4 Bg7 5.h4 h6 6.d4 d6 7.Nc3 c6 8.hxg5 hxg5 9.Rxh8 Bxh8 10.Ne5
• King's Gambit Accepted: Hanstein Gambit: 1.e4 e5 2.f4 exf4 3.Nf3 g5 4.Bc4 Bg7 5.0-0
• King's Gambit Accepted: Philidor Gambit, Schultz Variation: 1.e4 e5 2.f4 exf4 3.Nf3 h6 4.Bc4 d6 5.d4 g5 6.h4 Bg7 7.Qd3

• C39 King's Gambit Accepted, Allgaier and Kieseritzky Gambits including Rice Gambit
• King's Gambit Accepted: King's Knight's Gambit: 1.e4 e5 2.f4 exf4 3.Nf3 g5 4.h4
• King's Gambit Accepted: Kieseritzky Gambit: 1.e4 e5 2.f4 exf4 3.Nf3 g5 4.h4 g4 5.Ne5
• King's Gambit Accepted: Kieseritzky, Polerio Defense: 1.e4 e5 2.f4 exf4 3.Nf3 g5 4.h4 g4 5.Ne5 Be7
• King's Gambit Accepted: Kieseritzky Gambit, Paulsen Defense: 1.e4 e5 2.f4 exf4 3.Nf3 g5 4.h4 g4 5.Ne5 Bg7
• King's Gambit Accepted: Kieseritzky Gambit, Brentano Defense: 1.e4 e5 2.f4 exf4 3.Nf3 g5 4.h4 g4 5.Ne5 d5
• King's Gambit Accepted: Kieseritzky Gambit, Brentano Defense: 1.e4 e5 2.f4 exf4 3.Nf3 g5 4.h4 g4 5.Ne5 d5 6.d4 Nf6 7.Bxf4
• King's Gambit Accepted: Kieseritzky Gambit, Brentano Defense, Caro Variation: 1.e4 e5 2.f4 exf4 3.Nf3 g5 4.h4 g4 5.Ne5 d5 6.d4 Nf6 7.Bxf4 Nxe4 8.Nd2
• King's Gambit Accepted: Kieseritzky Gambit, Kolisch Defense: 1.e4 e5 2.f4 exf4 3.Nf3 g5 4.h4 g4 5.Ne5 d6
• King's Gambit Accepted: Kieseritzky Gambit, Long Whip: 1.e4 e5 2.f4 exf4 3.Nf3 g5 4.h4 g4 5.Ne5 h5
• King's Gambit Accepted: Kieseritzky, Long Whip Defense, Jaenisch Variation: 1.e4 e5 2.f4 exf4 3.Nf3 g5 4.h4 g4 5.Ne5 h5 6.Bc4 Rh7 7.d4 Bh6 8.Nc3
• King's Gambit Accepted: Kieseritzky Gambit, Neumann Defense: 1.e4 e5 2.f4 exf4 3.Nf3 g5 4.h4 g4 5.Ne5 Nc6
• King's Gambit Accepted: Kieseritzky Gambit, Berlin Defense: 1.e4 e5 2.f4 exf4 3.Nf3 g5 4.h4 g4 5.Ne5 Nf6
• King's Gambit Accepted: Kieseritzky Gambit, Anderssen Defense: 1.e4 e5 2.f4 exf4 3.Nf3 g5 4.h4 g4 5.Ne5 Nf6 6.Bc4 d5 7.exd5 Bd6
• King's Gambit Accepted: Kieseritzky Gambit, Anderssen-Cordel Gambit: 1.e4 e5 2.f4 exf4 3.Nf3 g5 4.h4 g4 5.Ne5 Nf6 6.Bc4 d5 7.exd5 Bd6 8.d4 Nh5 9.Bxf4 Nxf4
• King's Gambit Accepted: Kieseritzky, Rice Gambit: 1.e4 e5 2.f4 exf4 3.Nf3 g5 4.h4 g4 5.Ne5 Nf6 6.Bc4 d5 7.exd5 Bd6 8.0-0
• King's Gambit Accepted: Kieseritzky Gambit, Rice Gambit: 1.e4 e5 2.f4 exf4 3.Nf3 g5 4.h4 g4 5.Ne5 Nf6 6.Bc4 d5 7.exd5 Bd6 8.0-0 Bxe5
• King's Gambit Accepted: Kieseritzky Gambit, Paulsen Defense Deferred: 1.e4 e5 2.f4 exf4 3.Nf3 g5 4.h4 g4 5.Ne5 Nf6 6.Bc4 d5 7.exd5 Bg7
• King's Gambit Accepted: Kieseritzky Gambit, Berlin Defense, Rubinstein Variation: 1.e4 e5 2.f4 exf4 3.Nf3 g5 4.h4 g4 5.Ne5 Nf6 6.d4
• King's Gambit Accepted: Kieseritzky Gambit, Berlin Defense, de Riviere Variation: 1.e4 e5 2.f4 exf4 3.Nf3 g5 4.h4 g4 5.Ne5 Nf6 6.Nxg4 d5
• King's Gambit Accepted: Kieseritzky Gambit, Rosenthal Defense: 1.e4 e5 2.f4 exf4 3.Nf3 g5 4.h4 g4 5.Ne5 Qe7
• King's Gambit Accepted: Kieseritzky, Salvio Defense, Cozio Variation: 1.e4 e5 2.f4 exf4 3.Nf3 g5 4.h4 g4 5.Ne5 Qe7 6.d4 f5 7.Bc4
• King's Gambit Accepted: Allgaier Gambit: 1.e4 e5 2.f4 exf4 3.Nf3 g5 4.h4 g4 5.Ng5
• King's Gambit Accepted: Kieseritzky Gambit, Cotter Gambit: 1.e4 e5 2.f4 exf4 3.Nf3 g5 4.h4 g4 5.Ng5 h6 6.Nxf7
• King's Gambit Accepted: Allgaier Gambit, Urusov Attack: 1.e4 e5 2.f4 exf4 3.Nf3 g5 4.h4 g4 5.Ng5 h6 6.Nxf7 Kxf7 7.Bc4+
• King's Gambit Accepted: Allgaier, Urusov Attack: 1.e4 e5 2.f4 exf4 3.Nf3 g5 4.h4 g4 5.Ng5 h6 6.Nxf7 Kxf7 7.Bc4+ d5 8.Bxd5+ Kg7 9.d4
• King's Gambit Accepted: Allgaier Gambit, Thorold Attack: 1.e4 e5 2.f4 exf4 3.Nf3 g5 4.h4 g4 5.Ng5 h6 6.Nxf7 Kxf7 7.d4
• King's Gambit Accepted: Allgaier, Cook Variation: 1.e4 e5 2.f4 exf4 3.Nf3 g5 4.h4 g4 5.Ng5 h6 6.Nxf7 Kxf7 7.d4 d5 8.Bxf4 dxe4 9.Bc4+ Kg7 10.Be5+
• King's Gambit Accepted: Allgaier, Blackburne Gambit: 1.e4 e5 2.f4 exf4 3.Nf3 g5 4.h4 g4 5.Ng5 h6 6.Nxf7 Kxf7 7.Nc3
• King's Gambit Accepted: Allgaier, Horny Defense: 1.e4 e5 2.f4 exf4 3.Nf3 g5 4.h4 g4 5.Ng5 h6 6.Nxf7 Kxf7 7.Qxg4 Nf6 8.Qxf4 Bd6
• King's Gambit Accepted: Allgaier, Schlechter Defense: 1.e4 e5 2.f4 exf4 3.Nf3 g5 4.h4 g4 5.Ng5 Nf6

• C40 King's Knight Opening (includes Gunderam Defence, Brazilian Defence, Greco Defence, Damiano Defence, Elephant Gambit, and Latvian Gambit.)
• King's Knight Opening: 1.e4 e5 2.Nf3
• King's Pawn Game: Busch-Gass Gambit: 1.e4 e5 2.Nf3 Bc5
• King's Pawn Game: Busch-Gass Gambit, Chiodini Gambit: 1.e4 e5 2.Nf3 Bc5 3.Nxe5 Nc6
• King's Pawn Game: Gunderam Gambit: 1.e4 e5 2.Nf3 c6
• Elephant Gambit: 1.e4 e5 2.Nf3 d5
• Elephant Gambit: Maróczy Gambit: 1.e4 e5 2.Nf3 d5 3.exd5 Bd6
• Elephant Gambit: Paulsen Countergambit: 1.e4 e5 2.Nf3 d5 3.exd5 e4
• Elephant Gambit: Wasp Variation: 1.e4 e5 2.Nf3 d5 3.Nxe5 dxe4 4.Bc4 Qg5
• Latvian Gambit: 1.e4 e5 2.Nf3 f5
• Latvian Gambit: Senechaud Gambit: 1.e4 e5 2.Nf3 f5 3.b4
• Latvian Gambit: Mayet Attack: 1.e4 e5 2.Nf3 f5 3.Bc4
• Latvian Gambit: Mayet Attack, Strautins Gambit: 1.e4 e5 2.Nf3 f5 3.Bc4 b5
• Latvian Gambit: Mayet Attack, Polerio-Svedenborg Variation: 1.e4 e5 2.Nf3 f5 3.Bc4 fxe4 4.Nxe5 d5
• Latvian Gambit: Corkscrew Countergambit: 1.e4 e5 2.Nf3 f5 3.Bc4 fxe4 4.Nxe5 Nf6
• Latvian Gambit: Mayet Attack, Poisoned Pawn Variation: 1.e4 e5 2.Nf3 f5 3.Bc4 fxe4 4.Nxe5 Qg5 5.d4 Qxg2
• Latvian Gambit: Behting Variation: 1.e4 e5 2.Nf3 f5 3.Bc4 fxe4 4.Nxe5 Qg5 5.Nf7 Qxg2 6.Rf1 d5 7.Nxh8 Nf6
• Latvian Gambit: Mayet Attack, Morgado Defense: 1.e4 e5 2.Nf3 f5 3.Bc4 Nf6
• Latvian Gambit: Diepstraten Countergambit: 1.e4 e5 2.Nf3 f5 3.c4
• Latvian Gambit: Mason Countergambit: 1.e4 e5 2.Nf3 f5 3.d4
• Latvian Gambit Accepted: 1.e4 e5 2.Nf3 f5 3.exf5
• Latvian Gambit Accepted: Ian Defense: 1.e4 e5 2.Nf3 f5 3.exf5 e4 4.Ne5 Nf6 5.Be2 Be7 6.Bh5+ Kf8
• Latvian Gambit: Lobster Gambit: 1.e4 e5 2.Nf3 f5 3.g4
• Latvian Gambit: Mlotkowski Variation: 1.e4 e5 2.Nf3 f5 3.Nc3
• Latvian Gambit: Fraser Defense: 1.e4 e5 2.Nf3 f5 3.Nxe5 Nc6
• Latvian Gambit: Corkscrew Gambit: 1.e4 e5 2.Nf3 f5 3.Nxe5 Nf6 4.Bc4 fxe4 5.Nf7 Qe7 6.Nxh8 d5
• Latvian Gambit: Greco Variation: 1.e4 e5 2.Nf3 f5 3.Nxe5 Qe7
• Latvian Gambit Accepted: Main Line: 1.e4 e5 2.Nf3 f5 3.Nxe5 Qf6 4.d4
• Latvian Gambit Accepted: Bilguer Variation: 1.e4 e5 2.Nf3 f5 3.Nxe5 Qf6 4.d4 d6 5.Nc4
• Latvian Gambit Accepted: Bronstein Attack: 1.e4 e5 2.Nf3 f5 3.Nxe5 Qf6 4.d4 d6 5.Nc4 fxe4 6.Be2
• Latvian Gambit Accepted: Nimzowitsch Attack: 1.e4 e5 2.Nf3 f5 3.Nxe5 Qf6 4.d4 d6 5.Nc4 fxe4 6.Ne3
• Latvian Gambit Accepted: Bronstein Gambit: 1.e4 e5 2.Nf3 f5 3.Nxe5 Qf6 4.d4 d6 5.Nc4 fxe4 6.Qh5+ g6 7.Qe2
• Latvian Gambit Accepted: Foltys-Leonhardt Variation: 1.e4 e5 2.Nf3 f5 3.Nxe5 Qf6 4.Nc4
• Latvian Gambit Accepted: Foltys Variation: 1.e4 e5 2.Nf3 f5 3.Nxe5 Qf6 4.Nc4 fxe4 5.d3
• Latvian Gambit Accepted: Leonhardt Variation: 1.e4 e5 2.Nf3 f5 3.Nxe5 Qf6 4.Nc4 fxe4 5.Nc3
• King's Pawn Game: Damiano Defense: 1.e4 e5 2.Nf3 f6
• King's Pawn Game: Damiano Defense, Damiano Gambit: 1.e4 e5 2.Nf3 f6 3.Nxe5 fxe5 4.Qh5+ g6 5.Qxe5+ Qe7 6.Qxh8
• King's Pawn Game: Damiano Defense, Damiano Gambit, Chigorin Gambit: 1.e4 e5 2.Nf3 f6 3.Nxe5 Qe7 4.Nf3 d5
• Gunderam Defense: 1.e4 e5 2.Nf3 Qe7
• King's Pawn Game: Gunderam Defense, Gunderam Gambit: 1.e4 e5 2.Nf3 Qe7 3.Bc4 f5
• King's Pawn Game: McConnell Defense: 1.e4 e5 2.Nf3 Qf6
• King's Pawn Game: La Bourdonnais Gambit: 1.e4 e5 2.Nf3 Qf6 3.Bc4 Qg6 4.0-0

• C41 Philidor Defence
• Philidor Defense: Lion Variation, Sozin Variation: 1.e4 d6 2.d4 Nf6 3.Nc3 e5 4.Nf3 Nbd7 5.Bc4 Be7 6.0-0 0-0 7.Qe2 c6 8.a4 exd4
• Philidor Defense: Lion Variation, Delayed Bishop Sacrifice: 1.e4 d6 2.d4 Nf6 3.Nc3 Nbd7 4.Nf3 e5 5.Bc4 Be7 6.dxe5 dxe5 7.Bxf7+
• Philidor Defense: 1.e4 e5 2.Nf3 d6
• Philidor Defense: 1.e4 e5 2.Nf3 d6 3.Bc4
• Philidor Defense: 1.e4 e5 2.Nf3 d6 3.Bc4 Be7
• Philidor Defense: Steinitz Variation: 1.e4 e5 2.Nf3 d6 3.Bc4 Be7 4.c3
• Philidor Defense: Lopez Countergambit: 1.e4 e5 2.Nf3 d6 3.Bc4 f5
• Philidor Defense: 1.e4 e5 2.Nf3 d6 3.d4
• Philidor Defense: Philidor Gambit: 1.e4 e5 2.Nf3 d6 3.d4 Bd7
• Philidor Defense: Albin-Blackburne Gambit: 1.e4 e5 2.Nf3 d6 3.d4 Bg4 4.dxe5 Nd7
• Philidor Defense: Exchange Variation: 1.e4 e5 2.Nf3 d6 3.d4 exd4
• Philidor Defense: Morphy Gambit: 1.e4 e5 2.Nf3 d6 3.d4 exd4 4.Bc4
• Philidor Defense: Bird Gambit: 1.e4 e5 2.Nf3 d6 3.d4 exd4 4.c3
• Philidor Defense: Exchange Variation: 1.e4 e5 2.Nf3 d6 3.d4 exd4 4.Nxd4
• Philidor Defense: Paulsen Attack: 1.e4 e5 2.Nf3 d6 3.d4 exd4 4.Nxd4 d5 5.exd5
• Philidor Defense: Larsen Variation: 1.e4 e5 2.Nf3 d6 3.d4 exd4 4.Nxd4 g6
• Philidor Defense: Exchange Variation: 1.e4 e5 2.Nf3 d6 3.d4 exd4 4.Nxd4 Nf6
• Philidor Defense: Berger Variation: 1.e4 e5 2.Nf3 d6 3.d4 exd4 4.Nxd4 Nf6 5.Nc3 Be7 6.Be2 0-0 7.0-0 c5 8.Nf3 Nc6 9.Bg5 Be6 10.Re1
• Philidor Defense: Boden Variation: 1.e4 e5 2.Nf3 d6 3.d4 exd4 4.Qxd4 Bd7
• Philidor Defense: Philidor Countergambit: 1.e4 e5 2.Nf3 d6 3.d4 f5
• Philidor Defense: Lopez Countergambit, Jaenisch Variation: 1.e4 e5 2.Nf3 d6 3.d4 f5 4.Bc4 exd4 5.Ng5 Nh6 6.Nxh7
• Philidor Defense: Philidor Countergambit, del Rio Attack: 1.e4 e5 2.Nf3 d6 3.d4 f5 4.dxe5 fxe4 5.Ng5 d5 6.e6
• Philidor Defense: Philidor Countergambit, Berger Variation: 1.e4 e5 2.Nf3 d6 3.d4 f5 4.dxe5 fxe4 5.Ng5 d5 6.e6 Bc5 7.Nc3
• Philidor Defense: Philidor Countergambit, Zukertort Variation: 1.e4 e5 2.Nf3 d6 3.d4 f5 4.Nc3
• Philidor Defense: Hanham Variation: 1.e4 e5 2.Nf3 d6 3.d4 Nd7
• Philidor Defense: Hanham Variation, Delmar Variation: 1.e4 e5 2.Nf3 d6 3.d4 Nd7 4.Bc4 c6 5.c3
• Philidor Defense: Hanham Variation, Schlechter Variation: 1.e4 e5 2.Nf3 d6 3.d4 Nd7 4.Bc4 c6 5.Nc3
• Philidor Defense: Hanham, Kmoch Variation: 1.e4 e5 2.Nf3 d6 3.d4 Nd7 4.Bc4 c6 5.Ng5
• Philidor Defense: Hanham Variation, Krause Variation: 1.e4 e5 2.Nf3 d6 3.d4 Nd7 4.Bc4 c6 5.0-0
• Philidor Defense: Hanham Variation, Steiner Variation: 1.e4 e5 2.Nf3 d6 3.d4 Nd7 4.Bc4 c6 5.0-0 Be7 6.dxe5
• Philidor Defense: Hanham Variation, Sharp Variation: 1.e4 e5 2.Nf3 d6 3.d4 Nd7 4.Bc4 Nb6
• Philidor Defense: Lion Variation, Shirov Gambit: 1.e4 e5 2.Nf3 d6 3.d4 Nd7 4.Nc3 Ngf6 5.g4
• Philidor Defense: Nimzowitsch Variation: 1.e4 e5 2.Nf3 d6 3.d4 Nf6
• Philidor Defense: Nimzowitsch Variation, Klein Variation: 1.e4 e5 2.Nf3 d6 3.d4 Nf6 4.Bc4
• Philidor Defense: Nimzowitsch Variation: 1.e4 e5 2.Nf3 d6 3.d4 Nf6 4.dxe5
• Philidor Defense: Nimzowitsch Variation, Sokolsky Variation: 1.e4 e5 2.Nf3 d6 3.d4 Nf6 4.dxe5 Nxe4 5.Nbd2
• Philidor Defense: Nimzowitsch Variation, Rellstab Variation: 1.e4 e5 2.Nf3 d6 3.d4 Nf6 4.dxe5 Nxe4 5.Qd5
• Philidor Defense: Lion Variation: 1.e4 e5 2.Nf3 d6 3.d4 Nf6 4.Nc3 Nbd7
• Philidor Defense: Lion Variation, Bishop Sacrifice: 1.e4 e5 2.Nf3 d6 3.d4 Nf6 4.Nc3 Nbd7 5.Bc4 Be7 6.Bxf7+
• Philidor Defense: Nimzowitsch, Larobok Variation: 1.e4 e5 2.Nf3 d6 3.d4 Nf6 4.Nc3 Nbd7 5.Bc4 Be7 6.Ng5 0-0 7.Bxf7+
• Philidor Defense: Lion Variation, Forcing Line: 1.e4 e5 2.Nf3 d6 3.d4 Nf6 4.Nc3 Nbd7 5.Bc4 Be7 6.Ng5 0-0 7.Bxf7+ Rxf7 8.Ne6
• Philidor Defense: Lion Variation, Lion's Claw, with Bc4 and h6: 1.e4 e5 2.Nf3 d6 3.d4 Nf6 4.Nc3 Nbd7 5.Bc4 Be7 6.0-0 h6
• Philidor Defense: Lion Variation, Lion's Claw, with Be2 and c6: 1.e4 e5 2.Nf3 d6 3.d4 Nf6 4.Nc3 Nbd7 5.Be2 Be7 6.0-0 c6
• Philidor Defense: Nimzowitsch, Locock Variation: 1.e4 e5 2.Nf3 d6 3.d4 Nf6 4.Ng5

• C42 Petrov's Defence, including Marshall Trap
• Petrov's Defense: 1.e4 e5 2.Nf3 Nf6
• Petrov's Defense: Italian Variation: 1.e4 e5 2.Nf3 Nf6 3.Bc4
• Petrov's Defense: Three Knights Game: 1.e4 e5 2.Nf3 Nf6 3.Nc3
• Petrov's Defense: 1.e4 e5 2.Nf3 Nf6 3.Nxe5
• Petrov's Defense: 1.e4 e5 2.Nf3 Nf6 3.Nxe5 d6
• Petrov's Defense: Paulsen Attack: 1.e4 e5 2.Nf3 Nf6 3.Nxe5 d6 4.Nc4
• Petrov's Defense: Karklins-Martinovsky Variation: 1.e4 e5 2.Nf3 Nf6 3.Nxe5 d6 4.Nd3
• Petrov's Defense: 1.e4 e5 2.Nf3 Nf6 3.Nxe5 d6 4.Nf3
• Petrov's Defense: 1.e4 e5 2.Nf3 Nf6 3.Nxe5 d6 4.Nf3 Nxe4
• Petrov's Defense: Millennium Attack: 1.e4 e5 2.Nf3 Nf6 3.Nxe5 d6 4.Nf3 Nxe4 5.Bd3
• Petrov's Defense: Kaufmann Attack: 1.e4 e5 2.Nf3 Nf6 3.Nxe5 d6 4.Nf3 Nxe4 5.c4
• Petrov's Defense: French Attack: 1.e4 e5 2.Nf3 Nf6 3.Nxe5 d6 4.Nf3 Nxe4 5.d3
• Petrov's Defense: Classical Attack: 1.e4 e5 2.Nf3 Nf6 3.Nxe5 d6 4.Nf3 Nxe4 5.d4
• Petrov's Defense: Classical Attack, Marshall Variation: 1.e4 e5 2.Nf3 Nf6 3.Nxe5 d6 4.Nf3 Nxe4 5.d4 d5 6.Bd3 Bd6
• Petrov's Defense: Classical Attack, Tarrasch Variation: 1.e4 e5 2.Nf3 Nf6 3.Nxe5 d6 4.Nf3 Nxe4 5.d4 d5 6.Bd3 Bd6 7.0-0 0-0 8.c4 Bg4
• Petrov's Defense: Classical Attack, Marshall Trap: 1.e4 e5 2.Nf3 Nf6 3.Nxe5 d6 4.Nf3 Nxe4 5.d4 d5 6.Bd3 Bd6 7.0-0 0-0 8.c4 Bg4 9.cxd5 f5 10.Re1 Bxh2+
• Petrov's Defense: Classical Attack, Staunton Variation: 1.e4 e5 2.Nf3 Nf6 3.Nxe5 d6 4.Nf3 Nxe4 5.d4 d5 6.Bd3 Bd6 7.0-0 0-0 8.c4 c6
• Petrov's Defense: Classical Attack, Marshall Variation, Chinese Gambit: 1.e4 e5 2.Nf3 Nf6 3.Nxe5 d6 4.Nf3 Nxe4 5.d4 d5 6.Bd3 Bd6 7.0-0 0-0 8.c4 c6 9.Re1 Bg4
• Petrov's Defense: Classical Attack, Chigorin Variation: 1.e4 e5 2.Nf3 Nf6 3.Nxe5 d6 4.Nf3 Nxe4 5.d4 d5 6.Bd3 Be7 7.0-0 Nc6 8.Re1
• Petrov's Defense: Classical Attack, Maróczy Variation: 1.e4 e5 2.Nf3 Nf6 3.Nxe5 d6 4.Nf3 Nxe4 5.d4 d5 6.Bd3 Be7 7.0-0 Nc6 8.Re1 Bg4 9.c3 f5 10.c4 Bh4
• Petrov's Defense: Classical Attack, Berger Variation: 1.e4 e5 2.Nf3 Nf6 3.Nxe5 d6 4.Nf3 Nxe4 5.d4 d5 6.Bd3 Be7 7.0-0 Nc6 8.Re1 Bg4 9.c3 f5 10.Nbd2
• Petrov's Defense: Classical Attack, Mason Variation: 1.e4 e5 2.Nf3 Nf6 3.Nxe5 d6 4.Nf3 Nxe4 5.d4 d5 6.Bd3 Be7 7.0-0 0-0
• Petrov's Defense: Classical Attack, Mason-Showalter Variation: 1.e4 e5 2.Nf3 Nf6 3.Nxe5 d6 4.Nf3 Nxe4 5.d4 d5 6.Bd3 Nc6
• Petrov's Defense: Classical Attack, Jaenisch Variation: 1.e4 e5 2.Nf3 Nf6 3.Nxe5 d6 4.Nf3 Nxe4 5.d4 d5 6.Bd3 Nc6 7.0-0 Be7 8.c4
• Petrov's Defense: Classical Attack, Chigorin Variation, Main Line: 1.e4 e5 2.Nf3 Nf6 3.Nxe5 d6 4.Nf3 Nxe4 5.d4 d5 6.Bd3 Nc6 7.0-0 Be7 8.c4 Nb4 9.Be2
• Petrov's Defense: Classical Attack, Chigorin Variation, Browne Attack: 1.e4 e5 2.Nf3 Nf6 3.Nxe5 d6 4.Nf3 Nxe4 5.d4 d5 6.Bd3 Nc6 7.0-0 Be7 8.c4 Nb4 9.cxd5
• Petrov's Defense: Classical Attack, Krause Variation: 1.e4 e5 2.Nf3 Nf6 3.Nxe5 d6 4.Nf3 Nxe4 5.d4 d5 6.Bd3 Nc6 7.0-0 Be7 8.Re1 Bg4 9.c3 f5 10.c4
• Petrov's Defense: Classical Attack, Closed Variation: 1.e4 e5 2.Nf3 Nf6 3.Nxe5 d6 4.Nf3 Nxe4 5.d4 Nf6
• Petrov's Defense: Nimzowitsch Attack: 1.e4 e5 2.Nf3 Nf6 3.Nxe5 d6 4.Nf3 Nxe4 5.Nc3
• Petrov's Defense: Cozio Attack: 1.e4 e5 2.Nf3 Nf6 3.Nxe5 d6 4.Nf3 Nxe4 5.Qe2
• Petrov's Defense: Cochrane Gambit: 1.e4 e5 2.Nf3 Nf6 3.Nxe5 d6 4.Nxf7
• Petrov's Defense: Cochrane Gambit, Bishop Check Line: 1.e4 e5 2.Nf3 Nf6 3.Nxe5 d6 4.Nxf7 Kxf7 5.Bc4+
• Petrov's Defense: Cochrane Gambit, Center Variation: 1.e4 e5 2.Nf3 Nf6 3.Nxe5 d6 4.Nxf7 Kxf7 5.d4
• Petrov's Defense: Stafford Gambit: 1.e4 e5 2.Nf3 Nf6 3.Nxe5 Nc6
• Petrov's Defense: Stafford Gambit: 1.e4 e5 2.Nf3 Nf6 3.Nxe5 Nc6 4.Nxc6 dxc6
• Petrov's Defense: Damiano Variation: 1.e4 e5 2.Nf3 Nf6 3.Nxe5 Nxe4
• Petrov's Defense: Damiano Variation, Kholmov Gambit: 1.e4 e5 2.Nf3 Nf6 3.Nxe5 Nxe4 4.Qe2 Qe7
• Petrov's Defense: Moody Gambit: 1.e4 e5 2.Nf3 Nf6 3.Qe2 Nc6 4.d4

• C43 Petrov's Defence, Modern (Steinitz) Attack
• Bishop's Opening: Urusov Gambit: 1.e4 e5 2.Bc4 Nf6 3.d4 exd4 4.Nf3
• Bishop's Opening: Urusov Gambit, Keidansky Gambit: 1.e4 e5 2.Bc4 Nf6 3.d4 exd4 4.Nf3 Nxe4 5.Qxd4
• Petrov's Defense: Modern Attack: 1.e4 e5 2.Nf3 Nf6 3.d4
• Petrov's Defense: Modern Attack, Symmetrical Variation: 1.e4 e5 2.Nf3 Nf6 3.d4 d5
• Petrov's Defense: Modern Attack: 1.e4 e5 2.Nf3 Nf6 3.d4 exd4
• Petrov's Defense: Modern Attack, Tal Gambit: 1.e4 e5 2.Nf3 Nf6 3.d4 exd4 4.e5 Ne4 5.Bb5
• Petrov's Defense: Modern Attack, Steinitz Variation: 1.e4 e5 2.Nf3 Nf6 3.d4 exd4 4.e5 Ne4 5.Qe2
• Petrov's Defense: Modern Attack, Bardeleben Variation: 1.e4 e5 2.Nf3 Nf6 3.d4 exd4 4.e5 Ne4 5.Qe2 Nc5 6.Nxd4 Nc6
• Petrov's Defense: Modern Attack, Center Attack: 1.e4 e5 2.Nf3 Nf6 3.d4 exd4 4.e5 Ne4 5.Qxd4
• Petrov's Defense: Modern Attack, Center Variation: 1.e4 e5 2.Nf3 Nf6 3.d4 Nxe4 4.Bd3
• Petrov's Defense: Modern Attack, Trifunovic Variation: 1.e4 e5 2.Nf3 Nf6 3.d4 Nxe4 4.Bd3 d5 5.Nxe5 Bd6 6.0-0 0-0 7.c4 Bxe5
• Petrov's Defense: Modern Attack, Murrey Variation: 1.e4 e5 2.Nf3 Nf6 3.d4 Nxe4 4.Bd3 Nc6

• C44 King's Pawn Game (includes Ponziani Opening, Inverted Hungarian Opening, Irish Gambit, Konstantinopolsky Opening and some Scotch Game)
• King's Knight Opening: Normal Variation: 1.e4 e5 2.Nf3 Nc6
• King's Pawn Game: Pachman Wing Gambit: 1.e4 e5 2.Nf3 Nc6 3.b4
• Scotch Game: Benima Defense: 1.e4 e5 2.Nf3 Nc6 3.Bc4 Be7 4.d4 exd4
• Scotch Game: Scotch Gambit, Dubois Réti Defense: 1.e4 e5 2.Nf3 Nc6 3.Bc4 Nf6 4.d4 exd4
• Scotch Game: Scotch Gambit, Kingside Variation: 1.e4 e5 2.Nf3 Nc6 3.Bc4 Nf6 4.d4 exd4 5.e5 Ng4
• King's Pawn Game: Tayler Opening: 1.e4 e5 2.Nf3 Nc6 3.Be2
• King's Pawn Game: Tayler Opening, Inverted Hanham: 1.e4 e5 2.Nf3 Nc6 3.Be2 Nf6 4.d3 d5 5.Nbd2
• King's Pawn Game: Tayler Opening: 1.e4 e5 2.Nf3 Nc6 3.Be2 Nf6 4.d4
• King's Pawn Game: Tayler Opening, Basman Gambit: 1.e4 e5 2.Nf3 Nc6 3.Be2 Nf6 4.d4 exd4 5.e5
• Ponziani Opening: 1.e4 e5 2.Nf3 Nc6 3.c3
• Ponziani Opening: Romanishin Variation: 1.e4 e5 2.Nf3 Nc6 3.c3 Be7
• Ponziani Opening: Spanish Variation: 1.e4 e5 2.Nf3 Nc6 3.c3 d5 4.Bb5
• Ponziani Opening: Spanish Variation, Harrwitz Attack, Nikitin Gambit: 1.e4 e5 2.Nf3 Nc6 3.c3 d5 4.Bb5 dxe4 5.Nxe5 Qd5 6.Qa4
• Ponziani Opening: Caro Gambit: 1.e4 e5 2.Nf3 Nc6 3.c3 d5 4.Qa4 Bd7
• Ponziani Opening: Steinitz Variation: 1.e4 e5 2.Nf3 Nc6 3.c3 d5 4.Qa4 f6
• Ponziani Opening: Leonhardt Variation: 1.e4 e5 2.Nf3 Nc6 3.c3 d5 4.Qa4 Nf6
• Ponziani Opening: Ponziani Countergambit: 1.e4 e5 2.Nf3 Nc6 3.c3 f5
• Ponziani Opening: Ponziani Countergambit, Schmidt Attack: 1.e4 e5 2.Nf3 Nc6 3.c3 f5 4.d4 d6 5.d5
• Ponziani Opening: Jaenisch Counterattack: 1.e4 e5 2.Nf3 Nc6 3.c3 Nf6
• Ponziani Opening: Neumann Gambit: 1.e4 e5 2.Nf3 Nc6 3.c3 Nf6 4.Bc4
• Ponziani Opening: Jaenisch Counterattack: 1.e4 e5 2.Nf3 Nc6 3.c3 Nf6 4.d3
• Ponziani Opening: Jaenisch Counterattack: 1.e4 e5 2.Nf3 Nc6 3.c3 Nf6 4.d3 d5
• Ponziani Opening: Jaenisch Counterattack: 1.e4 e5 2.Nf3 Nc6 3.c3 Nf6 4.d3 d5 5.Nbd2
• Ponziani Opening: Vukovic Gambit: 1.e4 e5 2.Nf3 Nc6 3.c3 Nf6 4.d4 Nxe4 5.d5 Bc5
• Ponziani Opening: Réti Variation: 1.e4 e5 2.Nf3 Nc6 3.c3 Nge7
• King's Pawn Game: Dresden Opening: 1.e4 e5 2.Nf3 Nc6 3.c4
• Dresden Opening: The Goblin: 1.e4 e5 2.Nf3 Nc6 3.c4 Nf6 4.Nxe5
• Latvian Gambit: Clam Gambit: 1.e4 e5 2.Nf3 Nc6 3.d3 f5 4.exf5
• Scotch Game: 1.e4 e5 2.Nf3 Nc6 3.d4
• Scotch Game: 1.e4 e5 2.Nf3 Nc6 3.d4 exd4
• Scotch Game: Relfsson Gambit: 1.e4 e5 2.Nf3 Nc6 3.d4 exd4 4.Bb5
• Scotch Game: Scotch Gambit: 1.e4 e5 2.Nf3 Nc6 3.d4 exd4 4.Bc4
• Scotch Game: Scotch Gambit, London Defense: 1.e4 e5 2.Nf3 Nc6 3.d4 exd4 4.Bc4 Bb4+
• Scotch Game: Cochrane Variation: 1.e4 e5 2.Nf3 Nc6 3.d4 exd4 4.Bc4 Bb4+ 5.c3 dxc3 6.bxc3 Ba5 7.e5
• Scotch Game: Hanneken Variation: 1.e4 e5 2.Nf3 Nc6 3.d4 exd4 4.Bc4 Bb4+ 5.c3 dxc3 6.0-0 cxb2 7.Bxb2 Nf6 8.Ng5 0-0 9.e5 Nxe5
• Scotch Game: Haxo Gambit: 1.e4 e5 2.Nf3 Nc6 3.d4 exd4 4.Bc4 Bc5
• Scotch Game: Scotch Gambit, Sarratt Variation: 1.e4 e5 2.Nf3 Nc6 3.d4 exd4 4.Bc4 Bc5 5.Ng5
• Scotch Game: Cochrane-Shumov Defense: 1.e4 e5 2.Nf3 Nc6 3.d4 exd4 4.Bc4 Bc5 5.Ng5 Nh6 6.Nxf7 Nxf7 7.Bxf7+ Kxf7 8.Qh5+ g6 9.Qxc5 d5
• Scotch Game: Vitzthum Attack: 1.e4 e5 2.Nf3 Nc6 3.d4 exd4 4.Bc4 Bc5 5.Ng5 Nh6 6.Qh5
• Scotch Game: Scotch Gambit, Cochrane-Anderssen Variation: 1.e4 e5 2.Nf3 Nc6 3.d4 exd4 4.Bc4 Bc5 5.0-0 d6 6.c3 Bg4
• Scotch Game: Scotch Gambit, Advance Variation: 1.e4 e5 2.Nf3 Nc6 3.d4 exd4 4.Bc4 Nf6 5.e5
• Scotch Game: Göring Gambit: 1.e4 e5 2.Nf3 Nc6 3.d4 exd4 4.c3
• Scotch Game: Scotch Gambit, Göring Gambit Declined: 1.e4 e5 2.Nf3 Nc6 3.d4 exd4 4.c3 d5
• Scotch Game: Göring Gambit, Double Pawn Sacrifice: 1.e4 e5 2.Nf3 Nc6 3.d4 exd4 4.c3 dxc3 5.Bc4
• Scotch Game: Göring Gambit, Bardeleben Variation: 1.e4 e5 2.Nf3 Nc6 3.d4 exd4 4.c3 dxc3 5.Bc4 Nf6 6.Nxc3 Bb4
• Scotch Game: Göring Gambit, Main Line: 1.e4 e5 2.Nf3 Nc6 3.d4 exd4 4.c3 dxc3 5.Nxc3 Bb4
• Scotch Game: Sea-Cadet Mate: 1.e4 e5 2.Nf3 Nc6 3.d4 exd4 4.c3 dxc3 5.Nxc3 d6 6.Bc4 Bg4 7.0-0 Ne5 8.Nxe5 Bxd1 9.Bxf7+ Ke7 10.Nd5#
• Scotch Game: Lolli Variation: 1.e4 e5 2.Nf3 Nc6 3.d4 Nxd4
• Scotch Game: Napoleon Gambit: 1.e4 e5 2.Nf3 Nc6 3.d4 Nxd4 4.Nxd4 exd4 5.Bc4
• Scotch Game: Lolli Variation: 1.e4 e5 2.Nf3 Nc6 3.d4 Nxd4 4.Nxd4 exd4 5.Qxd4
• King's Knight Opening: Konstantinopolsky: 1.e4 e5 2.Nf3 Nc6 3.g3
• Irish Gambit: 1.e4 e5 2.Nf3 Nc6 3.Nxe5
• King's Pawn Game: Schulze-Müller Gambit: 1.e4 e5 2.Nf3 Nc6 3.Nxe5 Nxe5 4.d4

• C45 Scotch Game
• Scotch Game: 1.e4 e5 2.Nf3 Nc6 3.d4 exd4 4.Nxd4
• Scotch Game: Malaniuk Variation: 1.e4 e5 2.Nf3 Nc6 3.d4 exd4 4.Nxd4 Bb4+
• Scotch Game: Classical Variation: 1.e4 e5 2.Nf3 Nc6 3.d4 exd4 4.Nxd4 Bc5
• Scotch Game: Paulsen Attack: 1.e4 e5 2.Nf3 Nc6 3.d4 exd4 4.Nxd4 Bc5 5.Be3 Qf6 6.c3 Nge7 7.Bb5
• Scotch Game: Paulsen, Gunsberg Defense: 1.e4 e5 2.Nf3 Nc6 3.d4 exd4 4.Nxd4 Bc5 5.Be3 Qf6 6.c3 Nge7 7.Bb5 Nd8
• Scotch Game: Meitner Variation: 1.e4 e5 2.Nf3 Nc6 3.d4 exd4 4.Nxd4 Bc5 5.Be3 Qf6 6.c3 Nge7 7.Nc2
• Scotch Game: Classical Variation, Blackburne Attack: 1.e4 e5 2.Nf3 Nc6 3.d4 exd4 4.Nxd4 Bc5 5.Be3 Qf6 6.c3 Nge7 7.Qd2
• Scotch Game: Gottschall Variation: 1.e4 e5 2.Nf3 Nc6 3.d4 exd4 4.Nxd4 Bc5 5.Be3 Qf6 6.c3 Nge7 7.Qd2 d5 8.Nb5 Bxe3 9.Qxe3 0-0 10.Nxc7 Rb8 11.Nxd5 Nxd5 12.exd5 Nb4
• Scotch Game: Classical Variation, Millennium Variation: 1.e4 e5 2.Nf3 Nc6 3.d4 exd4 4.Nxd4 Bc5 5.Be3 Qf6 6.c3 Qg6
• Scotch Game: Blumenfeld Attack: 1.e4 e5 2.Nf3 Nc6 3.d4 exd4 4.Nxd4 Bc5 5.Be3 Qf6 6.Nb5
• Scotch Game: Potter Variation: 1.e4 e5 2.Nf3 Nc6 3.d4 exd4 4.Nxd4 Bc5 5.Nb3
• Scotch Game: Romanishin Variation: 1.e4 e5 2.Nf3 Nc6 3.d4 exd4 4.Nxd4 Bc5 5.Nb3 Bb4+
• Scotch Game: Classical Variation, Intermezzo Variation: 1.e4 e5 2.Nf3 Nc6 3.d4 exd4 4.Nxd4 Bc5 5.Nxc6 Qf6
• Scotch Game: Schmidt Variation: 1.e4 e5 2.Nf3 Nc6 3.d4 exd4 4.Nxd4 Nf6
• Scotch Game: Alekhine Gambit: 1.e4 e5 2.Nf3 Nc6 3.d4 exd4 4.Nxd4 Nf6 5.e5
• Scotch Game: Mieses Variation: 1.e4 e5 2.Nf3 Nc6 3.d4 exd4 4.Nxd4 Nf6 5.Nxc6 bxc6 6.e5
• Scotch Game: Tartakower Variation: 1.e4 e5 2.Nf3 Nc6 3.d4 exd4 4.Nxd4 Nf6 5.Nxc6 bxc6 6.Nd2
• Scotch Game: Ghulam-Kassim Variation: 1.e4 e5 2.Nf3 Nc6 3.d4 exd4 4.Nxd4 Nxd4 5.Qxd4 d6 6.Bd3
• Scotch Game: Steinitz Variation: 1.e4 e5 2.Nf3 Nc6 3.d4 exd4 4.Nxd4 Qh4
• Scotch Game: Braune Variation: 1.e4 e5 2.Nf3 Nc6 3.d4 exd4 4.Nxd4 Qh4 5.Be3
• Scotch Game: Horwitz Attack: 1.e4 e5 2.Nf3 Nc6 3.d4 exd4 4.Nxd4 Qh4 5.Nb5
• Scotch Game: 1.e4 e5 2.Nf3 Nc6 3.d4 exd4 4.Nxd4 Qh4 5.Nb5 Bb4+ 6.Bd2
• Scotch Game: Rosenthal Variation: 1.e4 e5 2.Nf3 Nc6 3.d4 exd4 4.Nxd4 Qh4 5.Nb5 Bb4+ 6.Bd2 Qxe4+ 7.Be2 Kd8 8.0-0 Bxd2 9.Nxd2 Qg6
• Scotch Game: Horwitz Attack, Blackburne Variation: 1.e4 e5 2.Nf3 Nc6 3.d4 exd4 4.Nxd4 Qh4 5.Nb5 Bb4+ 6.Bd2 Qxe4+ 7.Be2 Kd8 8.0-0 Bxd2 9.Qxd2
• Scotch Game: Steinitz Variation: 1.e4 e5 2.Nf3 Nc6 3.d4 exd4 4.Nxd4 Qh4 5.Nc3
• Scotch Game: Modern Defense: 1.e4 e5 2.Nf3 Nc6 3.d4 exd4 4.Nxd4 Qh4 5.Nc3 Bb4
• Scotch Game: Fraser Variation: 1.e4 e5 2.Nf3 Nc6 3.d4 exd4 4.Nxd4 Qh4 5.Nf3
• Scotch Game: Paulsen Variation: 1.e4 e5 2.Nf3 Nc6 3.d4 exd4 4.Nxd4 Qh4 5.Nf5

• C46 Three Knights Game including Halloween Gambit
• Three Knights Opening: 1.e4 e5 2.Nf3 Nc6 3.Nc3
• Three Knights Opening: 1.e4 e5 2.Nf3 Nc6 3.Nc3 Bb4
• Three Knights Opening: Schlechter Variation: 1.e4 e5 2.Nf3 Nc6 3.Nc3 Bb4 4.Nd5 Nf6
• Three Knights Opening: Winawer Defense: 1.e4 e5 2.Nf3 Nc6 3.Nc3 f5
• Three Knights Opening: Steinitz Defense: 1.e4 e5 2.Nf3 Nc6 3.Nc3 g6
• Three Knights Opening: Steinitz-Rosenthal Variation: 1.e4 e5 2.Nf3 Nc6 3.Nc3 g6 4.d4 exd4 5.Nd5

• C47 Four Knights Game
• Four Knights Game: Italian Variation: 1.e4 e5 2.Nf3 Nc6 3.Bc4 Nf6 4.Nc3
• Four Knights Game: Italian Variation, Noa Gambit: 1.e4 e5 2.Nf3 Nc6 3.Bc4 Nf6 4.Nc3 Nxe4 5.Bxf7+
• Four Knights Game: 1.e4 e5 2.Nf3 Nc6 3.Nc3 Nf6
• Four Knights Game: Gunsberg Variation: 1.e4 e5 2.Nf3 Nc6 3.Nc3 Nf6 4.a3
• Four Knights Game: Scotch Variation: 1.e4 e5 2.Nf3 Nc6 3.Nc3 Nf6 4.d4
• Four Knights Game: Scotch Variation, Oxford Gambit: 1.e4 e5 2.Nf3 Nc6 3.Nc3 Nf6 4.d4 Bb4 5.d5 Nd4
• Four Knights Game: Scotch Variation, Krause Gambit: 1.e4 e5 2.Nf3 Nc6 3.Nc3 Nf6 4.d4 Bb4 5.Nxe5
• Four Knights Game: Scotch Variation, Krause Gambit, Leonhardt Defense: 1.e4 e5 2.Nf3 Nc6 3.Nc3 Nf6 4.d4 Bb4 5.Nxe5 Qe7
• Four Knights Game: Scotch Variation Accepted: 1.e4 e5 2.Nf3 Nc6 3.Nc3 Nf6 4.d4 exd4
• Four Knights Game: Scotch Variation, Belgrade Gambit: 1.e4 e5 2.Nf3 Nc6 3.Nc3 Nf6 4.d4 exd4 5.Nd5
• Four Knights Game: Scotch Variation, Belgrade Gambit, Modern Defense: 1.e4 e5 2.Nf3 Nc6 3.Nc3 Nf6 4.d4 exd4 5.Nd5 Nxe4 6.Qe2 f5
• Four Knights Game: Scotch Variation, Schmid Defense: 1.e4 e5 2.Nf3 Nc6 3.Nc3 Nf6 4.d4 exd4 5.Nxd4 Nxe4
• Four Knights Game: Halloween Gambit: 1.e4 e5 2.Nf3 Nc6 3.Nc3 Nf6 4.Nxe5
• Four Knights Game: Halloween Gambit, Plasma Variation: 1.e4 e5 2.Nf3 Nc6 3.Nc3 Nf6 4.Nxe5 Nxe5 5.d4 Nc6 6.d5 Ne5 7.f4 Ng6 8.e5 Ng8 9.d6 cxd6 10.exd6 Qf6 11.Nb5 Rb8
• Four Knights Game: Halloween Gambit, Oldtimer Variation: 1.e4 e5 2.Nf3 Nc6 3.Nc3 Nf6 4.Nxe5 Nxe5 5.d4 Ng6 6.e5 Ng8 7.Bc4 Bb4 8.Qf3 f5

• C48 Four Knights Game, Spanish Variation
• Four Knights Game: Spanish Variation: 1.e4 e5 2.Nf3 Nc6 3.Nc3 Nf6 4.Bb5
• Four Knights Game: Spanish Variation, Ranken Variation: 1.e4 e5 2.Nf3 Nc6 3.Nc3 Nf6 4.Bb5 a6 5.Bxc6
• Four Knights Game: Spanish Variation, Spielmann Variation: 1.e4 e5 2.Nf3 Nc6 3.Nc3 Nf6 4.Bb5 a6 5.Bxc6 dxc6 6.Nxe5 Nxe4 7.Nxe4 Qd4 8.0-0 Qxe5 9.Re1 Be6 10.d4 Qd5
• Four Knights Game: Spanish Variation, Classical Variation: 1.e4 e5 2.Nf3 Nc6 3.Nc3 Nf6 4.Bb5 Bc5
• Four Knights Game: Spanish Variation, Bardeleben Variation: 1.e4 e5 2.Nf3 Nc6 3.Nc3 Nf6 4.Bb5 Bc5 5.0-0 0-0 6.Nxe5 Nxe5 7.d4 Bd6 8.f4 Nc6 9.e5 Bb4
• Four Knights Game: Spanish Variation, Rubinstein Variation: 1.e4 e5 2.Nf3 Nc6 3.Nc3 Nf6 4.Bb5 Nd4
• Four Knights Game: Spanish Variation, Rubinstein Variation, Marshall Gambit: 1.e4 e5 2.Nf3 Nc6 3.Nc3 Nf6 4.Bb5 Nd4 5.Ba4 Bc5 6.Nxe5 0-0
• Four Knights Game: Spanish Variation, Rubinstein Variation: 1.e4 e5 2.Nf3 Nc6 3.Nc3 Nf6 4.Bb5 Nd4 5.Be2
• Four Knights Game: Spanish Variation, Rubinstein Variation, Maróczy Variation: 1.e4 e5 2.Nf3 Nc6 3.Nc3 Nf6 4.Bb5 Nd4 5.Be2 Nxf3+ 6.Bxf3 Bc5 7.0-0 0-0 8.d3 d6 9.Na4 Bb6
• Four Knights Game: Spanish Variation, Rubinstein Variation Accepted: 1.e4 e5 2.Nf3 Nc6 3.Nc3 Nf6 4.Bb5 Nd4 5.Nxd4
• Four Knights Game: Spanish Variation, Rubinstein Variation, Marshall Variation: 1.e4 e5 2.Nf3 Nc6 3.Nc3 Nf6 4.Bb5 Nd4 5.Nxe5 Bc5 6.0-0 0-0
• Four Knights Game: Spanish Variation, Rubinstein Variation: 1.e4 e5 2.Nf3 Nf6 3.Nc3 Nc6 4.Bb5 Nd4 5.Nxe5 Qe7 6.f4
• Four Knights Game: Spanish Variation, Rubinstein Variation, Henneberger Variation: 1.e4 e5 2.Nf3 Nf6 3.Nc3 Nc6 4.Bb5 Nd4 5.0-0

• C49 Four Knights Game, Double Ruy Lopez
• Four Knights Game: Spanish Variation, Double Spanish: 1.e4 e5 2.Nf3 Nc6 3.Nc3 Nf6 4.Bb5 Bb4
• Four Knights Game: Spanish Variation, Nimzowitsch Variation: 1.e4 e5 2.Nf3 Nc6 3.Nc3 Nf6 4.Bb5 Bb4 5.0-0 0-0 6.Bxc6
• Four Knights Game: Spanish Variation, Double Spanish: 1.e4 e5 2.Nf3 Nc6 3.Nc3 Nf6 4.Bb5 Bb4 5.0-0 0-0 6.d3
• Four Knights Game: Spanish Variation: 1.e4 e5 2.Nf3 Nc6 3.Nc3 Nf6 4.Bb5 Bb4 5.0-0 0-0 6.d3 Bxc3
• Four Knights Game: Spanish Variation, Svenonius Variation: 1.e4 e5 2.Nf3 Nc6 3.Nc3 Nf6 4.Bb5 Bb4 5.0-0 0-0 6.d3 Bxc3 7.bxc3 d5
• Four Knights Game: Spanish Variation, Janowski Variation: 1.e4 e5 2.Nf3 Nc6 3.Nc3 Nf6 4.Bb5 Bb4 5.0-0 0-0 6.d3 Bxc3 7.bxc3 d6 8.Re1
• Four Knights Game: Spanish Variation, Symmetrical Variation: 1.e4 e5 2.Nf3 Nc6 3.Nc3 Nf6 4.Bb5 Bb4 5.0-0 0-0 6.d3 d6
• Four Knights Game: Spanish Variation, Symmetrical Variation, Metger Unpin: 1.e4 e5 2.Nf3 Nc6 3.Nc3 Nf6 4.Bb5 Bb4 5.0-0 0-0 6.d3 d6 7.Bg5 Bxc3 8.bxc3 Qe7
• Four Knights Game: Spanish Variation, Symmetrical Variation: 1.e4 e5 2.Nf3 Nc6 3.Nc3 Nf6 4.Bb5 Bb4 5.0-0 0-0 6.d3 d6 7.Bg5 Bxc3 8.bxc3 Qe7 9.Re1 Nd8 10.d4 Bg4
• Four Knights Game: Spanish Variation, Symmetrical Variation: 1.e4 e5 2.Nf3 Nc6 3.Nc3 Nf6 4.Bb5 Bb4 5.0-0 0-0 6.d3 d6 7.Bg5 Ne7
• Four Knights Game: Spanish Variation, Symmetrical Variation, Blake Variation: 1.e4 e5 2.Nf3 Nc6 3.Nc3 Nf6 4.Bb5 Bb4 5.0-0 0-0 6.d3 d6 7.Bg5 Ne7 8.Nh4 c6 9.Bc4 d5 10.Bb3 Qd6
• Four Knights Game: Spanish Variation, Symmetrical Variation: 1.e4 e5 2.Nf3 Nc6 3.Nc3 Nf6 4.Bb5 Bb4 5.0-0 0-0 6.d3 d6 7.Ne2
• Four Knights Game: Spanish Variation, Alatortsev Variation: 1.e4 e5 2.Nf3 Nc6 3.Nc3 Nf6 4.Bb5 Bb4 5.0-0 0-0 6.d3 Qe7 7.Ne2 d5
• Four Knights Game: Spanish Variation, Symmetrical Variation, Tarrasch Variation: 1.e4 e5 2.Nf3 Nf6 3.Nc3 Nc6 4.Bb5 Bb4 5.0-0 0-0 6.d3 d6 7.Bg5 Be6
• Four Knights Game: Spanish Variation, Gunsberg Counterattack: 1.e4 e5 2.Nf3 Nf6 3.Nc3 Nc6 4.Bb5 Bb4 5.0-0 0-0 6.Nd5 Nxd5 7.exd5 e4

• C50 Italian Game (includes Blackburne Shilling Gambit, Hungarian Defence, Semi-Italian Opening, Italian Gambit, Légal Trap, Rousseau Gambit, Koltanowski Gambit and Giuoco Pianissimo)
• Italian Game: 1.e4 e5 2.Nf3 Nc6 3.Bc4
• Italian Game: Giuoco Piano: 1.e4 e5 2.Nf3 Nc6 3.Bc4 Bc5
• Italian Game: Jerome Gambit: 1.e4 e5 2.Nf3 Nc6 3.Bc4 Bc5 4.Bxf7+
• Italian Game: Giuoco Pianissimo: 1.e4 e5 2.Nf3 Nc6 3.Bc4 Bc5 4.d3
• Italian Game: Giuoco Pianissimo, Lucchini Gambit: 1.e4 e5 2.Nf3 Nc6 3.Bc4 Bc5 4.d3 f5
• Italian Game: Giuoco Pianissimo, Dubois Variation: 1.e4 e5 2.Nf3 Nc6 3.Bc4 Bc5 4.d3 f5 5.Ng5 f4
• Italian Game: Giuoco Pianissimo, Italian Four Knights Variation: 1.e4 e5 2.Nf3 Nc6 3.Bc4 Bc5 4.d3 Nf6 5.Nc3
• Italian Game: Giuoco Pianissimo, Canal Variation: 1.e4 e5 2.Nf3 Nc6 3.Bc4 Bc5 4.d3 Nf6 5.Nc3 d6 6.Bg5
• Italian Game: Rosentreter Gambit: 1.e4 e5 2.Nf3 Nc6 3.Bc4 Bc5 4.d4
• Four Knights Game: Italian Variation: 1.e4 e5 2.Nf3 Nc6 3.Bc4 Bc5 4.Nc3 Nf6
• Italian Game: Classical Variation, Albin Gambit: 1.e4 e5 2.Nf3 Nc6 3.Bc4 Bc5 4.0-0 Nf6 5.c3
• Italian Game: Deutz Gambit: 1.e4 e5 2.Nf3 Nc6 3.Bc4 Bc5 4.0-0 Nf6 5.d4
• Italian Game: Hungarian Defense: 1.e4 e5 2.Nf3 Nc6 3.Bc4 Be7
• Italian Game: Hungarian Defense, Tartakower Variation: 1.e4 e5 2.Nf3 Nc6 3.Bc4 Be7 4.d4 exd4 5.c3 Nf6 6.e5 Ne4
• Italian Game: Paris Defense: 1.e4 e5 2.Nf3 Nc6 3.Bc4 d6
• Italian Game: Rousseau Gambit: 1.e4 e5 2.Nf3 Nc6 3.Bc4 f5
• Italian Game: Anti-Fried Liver Defense: 1.e4 e5 2.Nf3 Nc6 3.Bc4 h6
• Italian Game: Blackburne-Kostić Gambit: 1.e4 e5 2.Nf3 Nc6 3.Bc4 Nd4
• Italian Game: Giuoco Pianissimo, Normal: 1.e4 e5 2.Nf3 Nc6 3.Bc4 Nf6 4.d3 Bc5
• Italian Game: Giuoco Pianissimo: 1.e4 e5 2.Nf3 Nc6 3.Bc4 Nf6 4.0-0 Bc5 5.Nc3 d6 6.d3

• C51 Evans Gambit
• Italian Game: Evans Gambit: 1.e4 e5 2.Nf3 Nc6 3.Bc4 Bc5 4.b4
• Italian Game: Evans Gambit, Fontaine Countergambit: 1.e4 e5 2.Nf3 Nc6 3.Bc4 Bc5 4.b4 b5
• Italian Game: Evans Gambit Declined: 1.e4 e5 2.Nf3 Nc6 3.Bc4 Bc5 4.b4 Bb6
• Italian Game: Evans Gambit Declined: 1.e4 e5 2.Nf3 Nc6 3.Bc4 Bc5 4.b4 Bb6 5.a4
• Italian Game: Evans Gambit Declined, Showalter Variation: 1.e4 e5 2.Nf3 Nc6 3.Bc4 Bc5 4.b4 Bb6 5.a4 a6 6.Nc3
• Italian Game: Evans Gambit Declined, Lange Variation: 1.e4 e5 2.Nf3 Nc6 3.Bc4 Bc5 4.b4 Bb6 5.b5 Na5 6.Nxe5 Nh6
• Italian Game: Evans Gambit Declined, Pavlov Variation: 1.e4 e5 2.Nf3 Nc6 3.Bc4 Bc5 4.b4 Bb6 5.b5 Na5 6.Nxe5 Nh6 7.d4 d6 8.Bxh6 dxe5 9.Bxg7 Rg8 10.Bxf7+ Kxf7 11.Bxe5 Qg5 12.Nd2
• Italian Game: Evans Gambit Declined, Hirschbach Variation: 1.e4 e5 2.Nf3 Nc6 3.Bc4 Bc5 4.b4 Bb6 5.b5 Na5 6.Nxe5 Qg5
• Italian Game: Evans Gambit Declined, Vasquez Variation: 1.e4 e5 2.Nf3 Nc6 3.Bc4 Bc5 4.b4 Bb6 5.b5 Na5 6.Nxe5 Qg5 7.Bxf7+ Ke7 8.Qh5
• Italian Game: Evans Gambit Declined, Hicken Variation: 1.e4 e5 2.Nf3 Nc6 3.Bc4 Bc5 4.b4 Bb6 5.b5 Na5 6.Nxe5 Qg5 7.Qf3 Qxe5 8.Qxf7+ Kd8 9.Bb2
• Italian Game: Evans Gambit Declined, Cordel Variation: 1.e4 e5 2.Nf3 Nc6 3.Bc4 Bc5 4.b4 Bb6 5.Bb2
• Italian Game: Evans Gambit Accepted: 1.e4 e5 2.Nf3 Nc6 3.Bc4 Bc5 4.b4 Bxb4
• Italian Game: Evans Gambit, Morphy Attack: 1.e4 e5 2.Nf3 Nc6 3.Bc4 Bc5 4.b4 Bxb4 5.c3 Ba5 6.d4 exd4 7.0-0 d6 8.cxd4 Bb6 9.Nc3
• Italian Game: Evans Gambit, McDonnell Defense: 1.e4 e5 2.Nf3 Nc6 3.Bc4 Bc5 4.b4 Bxb4 5.c3 Bc5
• Italian Game: Evans Gambit, Harding Variation: 1.e4 e5 2.Nf3 Nc6 3.Bc4 Bc5 4.b4 Bxb4 5.c3 Bc5 6.d4 exd4 7.cxd4 Bb4+ 8.Bd2
• Italian Game: Evans Gambit, McDonnell Defense, Main Line: 1.e4 e5 2.Nf3 Nc6 3.Bc4 Bc5 4.b4 Bxb4 5.c3 Bc5 6.d4 exd4 7.0-0 d6 8.cxd4 Bb6
• Italian Game: Evans Gambit, Ulvestad Variation: 1.e4 e5 2.Nf3 Nc6 3.Bc4 Bc5 4.b4 Bxb4 5.c3 Bc5 6.d4 exd4 7.0-0 d6 8.cxd4 Bb6 9.d5 Na5 10.Bb2
• Italian Game: Evans Gambit, Paulsen Variation: 1.e4 e5 2.Nf3 Nc6 3.Bc4 Bc5 4.b4 Bxb4 5.c3 Bc5 6.d4 exd4 7.0-0 d6 8.cxd4 Bb6 9.d5 Na5 10.Bb2 Ne7
• Italian Game: Evans Gambit: 1.e4 e5 2.Nf3 Nc6 3.Bc4 Bc5 4.b4 Bxb4 5.c3 Bc5 6.d4 exd4 7.0-0 d6 8.cxd4 Bb6 9.Nc3 Bg4
• Italian Game: Evans Gambit, Fraser Attack: 1.e4 e5 2.Nf3 Nc6 3.Bc4 Bc5 4.b4 Bxb4 5.c3 Bc5 6.d4 exd4 7.0-0 d6 8.cxd4 Bb6 9.Nc3 Bg4 10.Qa4
• Italian Game: Evans Gambit, Fraser-Mortimer Attack: 1.e4 e5 2.Nf3 Nc6 3.Bc4 Bc5 4.b4 Bxb4 5.c3 Bc5 6.d4 exd4 7.0-0 d6 8.cxd4 Bb6 9.Nc3 Bg4 10.Qa4 Bd7 11.Qb3 Na5 12.Bxf7+ Kf8 13.Qc2
• Italian Game: Evans Gambit, Mortimer-Evans Gambit: 1.e4 e5 2.Nf3 Nc6 3.Bc4 Bc5 4.b4 Bxb4 5.c3 Bc5 6.d4 exd4 7.0-0 d6 8.cxd4 Bb6 9.Nc3 Bg4 10.Qa4 Bd7 11.Qb3 Na5 12.Bxf7+ Kf8 13.Qc2 Kxf7
• Italian Game: Evans Gambit, Göring Attack: 1.e4 e5 2.Nf3 Nc6 3.Bc4 Bc5 4.b4 Bxb4 5.c3 Bc5 6.d4 exd4 7.0-0 d6 8.cxd4 Bb6 9.Nc3 Na5 10.Bg5
• Italian Game: Evans Gambit, Steinitz Variation: 1.e4 e5 2.Nf3 Nc6 3.Bc4 Bc5 4.b4 Bxb4 5.c3 Bc5 6.d4 exd4 7.0-0 d6 8.cxd4 Bb6 9.Nc3 Na5 10.Bg5 f6 11.Be3
• Italian Game: Evans Gambit, Stone-Ware Variation: 1.e4 e5 2.Nf3 Nc6 3.Bc4 Bc5 4.b4 Bxb4 5.c3 Bd6
• Italian Game: Evans Gambit, Anderssen Variation: 1.e4 e5 2.Nf3 Nc6 3.Bc4 Bc5 4.b4 Bxb4 5.c3 Be7
• Italian Game: Evans Gambit, Anderssen Variation, Cordel Line: 1.e4 e5 2.Nf3 Nc6 3.Bc4 Bc5 4.b4 Bxb4 5.c3 Be7 6.d4 Na5
• Italian Game: Evans Gambit, Mayet Defense: 1.e4 e5 2.Nf3 Nc6 3.Bc4 Bc5 4.b4 Bxb4 5.c3 Bf8
• Italian Game: Evans Gambit, Hein Countergambit: 1.e4 e5 2.Nf3 Nc6 3.Bc4 Bc5 4.b4 d5

• C52 Evans Gambit with 4...Bxb4 5.c3 Ba5
• Italian Game: Evans Gambit, Main Line: 1.e4 e5 2.Nf3 Nc6 3.Bc4 Bc5 4.b4 Bxb4 5.c3 Ba5
• Italian Game: Evans Gambit, Leonhardt Countergambit: 1.e4 e5 2.Nf3 Nc6 3.Bc4 Bc5 4.b4 Bxb4 5.c3 Ba5 6.d4 b5
• Italian Game: Evans Gambit, Bronstein Defense: 1.e4 e5 2.Nf3 Nc6 3.Bc4 Bc5 4.b4 Bxb4 5.c3 Ba5 6.d4 d6
• Italian Game: Evans Gambit, Sokolsky Variation: 1.e4 e5 2.Nf3 Nc6 3.Bc4 Bc5 4.b4 Bxb4 5.c3 Ba5 6.d4 d6 7.Bg5
• Italian Game: Evans Gambit, Tartakower Attack: 1.e4 e5 2.Nf3 Nc6 3.Bc4 Bc5 4.b4 Bxb4 5.c3 Ba5 6.d4 d6 7.Qb3
• Italian Game: Evans Gambit, Levenfish Variation: 1.e4 e5 2.Nf3 Nc6 3.Bc4 Bc5 4.b4 Bxb4 5.c3 Ba5 6.d4 d6 7.Qb3 Qd7 8.dxe5 dxe5 9.0-0 Bb6 10.Ba3 Na5 11.Nxe5
• Italian Game: Evans Gambit, Pierce Defense: 1.e4 e5 2.Nf3 Nc6 3.Bc4 Bc5 4.b4 Bxb4 5.c3 Ba5 6.d4 exd4
• Italian Game: Evans Gambit, Johner Defense: 1.e4 e5 2.Nf3 Nc6 3.Bc4 Bc5 4.b4 Bxb4 5.c3 Ba5 6.d4 exd4 7.0-0 b5
• Italian Game: Evans Gambit, Dufresne Defense: 1.e4 e5 2.Nf3 Nc6 3.Bc4 Bc5 4.b4 Bxb4 5.c3 Ba5 6.d4 exd4 7.0-0 d3
• Italian Game: Evans Gambit, Waller Attack: 1.e4 e5 2.Nf3 Nc6 3.Bc4 Bc5 4.b4 Bxb4 5.c3 Ba5 6.d4 exd4 7.0-0 d6 8.Qb3
• Italian Game: Evans Gambit, Compromised Defense: 1.e4 e5 2.Nf3 Nc6 3.Bc4 Bc5 4.b4 Bxb4 5.c3 Ba5 6.d4 exd4 7.0-0 dxc3
• Italian Game: Evans Gambit, Compromised Defense, Main Line: 1.e4 e5 2.Nf3 Nc6 3.Bc4 Bc5 4.b4 Bxb4 5.c3 Ba5 6.d4 exd4 7.0-0 dxc3 8.Qb3 Qf6 9.e5 Qg6 10.Nxc3 Nge7 11.Ba3
• Italian Game: Evans Gambit, Compromised Defense, Potter Variation: 1.e4 e5 2.Nf3 Nc6 3.Bc4 Bc5 4.b4 Bxb4 5.c3 Ba5 6.d4 exd4 7.0-0 dxc3 8.Qb3 Qf6 9.e5 Qg6 10.Nxc3 Nge7 11.Rd1
• Italian Game: Evans Gambit, Mieses Defense: 1.e4 e5 2.Nf3 Nc6 3.Bc4 Bc5 4.b4 Bxb4 5.c3 Ba5 6.d4 exd4 7.0-0 Nge7
• Italian Game: Evans Gambit, Laroche Variation: 1.e4 e5 2.Nf3 Nc6 3.Bc4 Bc5 4.b4 Bxb4 5.c3 Ba5 6.d4 Nf6
• Italian Game: Evans Gambit, Slow Variation: 1.e4 e5 2.Nf3 Nc6 3.Bc4 Bc5 4.b4 Bxb4 5.c3 Ba5 6.0-0
• Italian Game: Evans Gambit: 1.e4 e5 2.Nf3 Nc6 3.Bc4 Bc5 4.b4 Bxb4 5.c3 Ba5 6.0-0 d6
• Italian Game: Evans Gambit, Lasker Defense: 1.e4 e5 2.Nf3 Nc6 3.Bc4 Bc5 4.b4 Bxb4 5.c3 Ba5 6.0-0 d6 7.d4 Bb6
• Italian Game: Evans Gambit, Sanders-Alapin Variation: 1.e4 e5 2.Nf3 Nc6 3.Bc4 Bc5 4.b4 Bxb4 5.c3 Ba5 6.0-0 d6 7.d4 Bd7
• Italian Game: Evans Gambit, Alapin-Steinitz Variation: 1.e4 e5 2.Nf3 Nc6 3.Bc4 Bc5 4.b4 Bxb4 5.c3 Ba5 6.0-0 d6 7.d4 Bg4
• Italian Game: Evans Gambit, Anderssen Defense: 1.e4 e5 2.Nf3 Nc6 3.Bc4 Bc5 4.b4 Bxb4 5.c3 Ba5 6.0-0 Nf6 7.d4 exd4
• Italian Game: Evans Gambit, Richardson Attack: 1.e4 e5 2.Nf3 Nc6 3.Bc4 Bc5 4.b4 Bxb4 5.c3 Ba5 6.0-0 Nf6 7.d4 0-0 8.Nxe5

• C53 Giuoco Piano
• Italian Game: Classical Variation: 1.e4 e5 2.Nf3 Nc6 3.Bc4 Bc5 4.c3
• Italian Game: Classical Variation, La Bourdonnais Variation: 1.e4 e5 2.Nf3 Nc6 3.Bc4 Bc5 4.c3 d6 5.d4 exd4 6.cxd4 Bb6
• Italian Game: Bird's Attack: 1.e4 e5 2.Nf3 Nc6 3.Bc4 Bc5 4.c3 Nf6 5.b4
• Italian Game: Classical Variation, Closed Variation: 1.e4 e5 2.Nf3 Nc6 3.Bc4 Bc5 4.c3 Qe7
• Italian Game: Classical Variation, Center Holding Variation: 1.e4 e5 2.Nf3 Nc6 3.Bc4 Bc5 4.c3 Qe7 5.d4 Bb6
• Italian Game: Classical Variation, Mestel Variation: 1.e4 e5 2.Nf3 Nc6 3.Bc4 Bc5 4.c3 Qe7 5.d4 Bb6 6.Bg5
• Italian Game: Classical Variation, Eisinger Variation: 1.e4 e5 2.Nf3 Nc6 3.Bc4 Bc5 4.c3 Qe7 5.d4 Bb6 6.d5 Nb8 7.d6
• Italian Game: Classical Variation, Tarrasch Variation: 1.e4 e5 2.Nf3 Nc6 3.Bc4 Bc5 4.c3 Qe7 5.d4 Bb6 6.0-0 d6 7.a4 a6 8.h3 Nf6 9.Re1

• C54 Giuoco Piano
• Italian Game: Classical Variation: 1.e4 e5 2.Nf3 Nc6 3.Bc4 Bc5 4.c3 Nf6
• Italian Game: Classical Variation, Giuoco Pianissimo: 1.e4 e5 2.Nf3 Nc6 3.Bc4 Bc5 4.c3 Nf6 5.d3
• Italian Game: Classical Variation, Giuoco Pianissimo, with a6: 1.e4 e5 2.Nf3 Nc6 3.Bc4 Bc5 4.c3 Nf6 5.d3 a6
• Italian Game: Classical Variation, Giuoco Pianissimo, with d6: 1.e4 e5 2.Nf3 Nc6 3.Bc4 Bc5 4.c3 Nf6 5.d3 d6
• Italian Game: Classical Variation, Giuoco Pianissimo, Albin Variation: 1.e4 e5 2.Nf3 Nc6 3.Bc4 Bc5 4.c3 Nf6 5.d3 d6 6.b4
• Italian Game: Classical Variation, Giuoco Pianissimo, with a6: 1.e4 e5 2.Nf3 Nc6 3.Bc4 Bc5 4.c3 Nf6 5.d3 d6 6.Nbd2 a6
• Italian Game: Classical Variation, Giuoco Pianissimo: 1.e4 e5 2.Nf3 Nc6 3.Bc4 Bc5 4.c3 Nf6 5.d3 d6 6.Nbd2 0-0 7.0-0
• Italian Game: Classical Variation, Giuoco Pianissimo: 1.e4 e5 2.Nf3 Nc6 3.Bc4 Bc5 4.c3 Nf6 5.d3 d6 6.0-0 0-0
• Italian Game: Classical Variation, Giuoco Pianissimo, Main Line: 1.e4 e5 2.Nf3 Nc6 3.Bc4 Bc5 4.c3 Nf6 5.d3 d6 6.0-0 0-0 7.Re1 a6 8.Bb3 Ba7 9.h3
• Italian Game: Classical Variation, Center Attack: 1.e4 e5 2.Nf3 Nc6 3.Bc4 Bc5 4.c3 Nf6 5.d4
• Italian Game: Classical Variation, Greco Gambit, Traditional Line: 1.e4 e5 2.Nf3 Nc6 3.Bc4 Bc5 4.c3 Nf6 5.d4 exd4 6.cxd4
• Italian Game: Giuoco Piano, Krause Variation: 1.e4 e5 2.Nf3 Nc6 3.Bc4 Bc5 4.c3 Nf6 5.d4 exd4 6.cxd4 Bb4+ 7.Bd2 Nxe4 8.Bxb4 Nxb4 9.Bxf7+ Kxf7 10.Qb3+ d5 11.Ne5+ Kf6 12.f3
• Italian Game: Giuoco Piano, Cracow Variation: 1.e4 e5 2.Nf3 Nc6 3.Bc4 Bc5 4.c3 Nf6 5.d4 exd4 6.cxd4 Bb4+ 7.Kf1
• Italian Game: Giuoco Piano, Greco's Attack: 1.e4 e5 2.Nf3 Nc6 3.Bc4 Bc5 4.c3 Nf6 5.d4 exd4 6.cxd4 Bb4+ 7.Nc3
• Italian Game: Classical Variation, Greco Gambit, Main Line: 1.e4 e5 2.Nf3 Nc6 3.Bc4 Bc5 4.c3 Nf6 5.d4 exd4 6.cxd4 Bb4+ 7.Nc3 Nxe4 8.0-0 Bxc3
• Italian Game: Giuoco Piano, Steinitz Variation: 1.e4 e5 2.Nf3 Nc6 3.Bc4 Bc5 4.c3 Nf6 5.d4 exd4 6.cxd4 Bb4+ 7.Nc3 Nxe4 8.0-0 Bxc3 9.bxc3 d5 10.Ba3
• Italian Game: Classical Variation, Greco Gambit, Moeller-Therkatz Attack: 1.e4 e5 2.Nf3 Nc6 3.Bc4 Bc5 4.c3 Nf6 5.d4 exd4 6.cxd4 Bb4+ 7.Nc3 Nxe4 8.0-0 Bxc3 9.d5
• Italian Game: Giuoco Piano, Therkatz-Herzog Variation: 1.e4 e5 2.Nf3 Nc6 3.Bc4 Bc5 4.c3 Nf6 5.d4 exd4 6.cxd4 Bb4+ 7.Nc3 Nxe4 8.0-0 Bxc3 9.d5 Bf6 10.Re1 Ne7 11.Rxe4 d6 12.Bg5 Bxg5 13.Nxg5 0-0 14.Nxh7
• Italian Game: Classical Variation, Greco Gambit, Moeller-Bayonet Attack: 1.e4 e5 2.Nf3 Nc6 3.Bc4 Bc5 4.c3 Nf6 5.d4 exd4 6.cxd4 Bb4+ 7.Nc3 Nxe4 8.0-0 Bxc3 9.d5 Bf6 10.Re1 Ne7 11.Rxe4 d6 12.g4
• Italian Game: Classical Variation, Greco Gambit, Greco Variation: 1.e4 e5 2.Nf3 Nc6 3.Bc4 Bc5 4.c3 Nf6 5.d4 exd4 6.cxd4 Bb4+ 7.Nc3 Nxe4 8.0-0 Nxc3
• Italian Game: Giuoco Piano, Aitken Variation: 1.e4 e5 2.Nf3 Nc6 3.Bc4 Bc5 4.c3 Nf6 5.d4 exd4 6.cxd4 Bb4+ 7.Nc3 Nxe4 8.0-0 Nxc3 9.bxc3 Bxc3 10.Ba3
• Italian Game: Giuoco Piano, Bernstein Variation: 1.e4 e5 2.Nf3 Nc6 3.Bc4 Bc5 4.c3 Nf6 5.d4 exd4 6.cxd4 Bb4+ 7.Nc3 Nxe4 8.0-0 Nxc3 9.bxc3 Bxc3 10.Qb3 d5
• Italian Game: Classical Variation, Greco Gambit, Anderssen Variation: 1.e4 e5 2.Nf3 Nc6 3.Bc4 Bc5 4.c3 Nf6 5.d4 exd4 6.e5 d5 7.Bb5 Ne4 8.cxd4 Bb4+
• Italian Game: Classical Variation, Ghulam-Kassim Variation: 1.e4 e5 2.Nf3 Nc6 3.Bc4 Bc5 4.c3 Nf6 5.d4 exd4 6.e5 Ne4 7.Bd5 Nxf2 8.Kxf2 dxc3+ 9.Kg3
• Italian Game: Classical Variation, Giuoco Pianissimo, with a5: 1.e4 e5 2.Nf3 Nc6 3.Bc4 Bc5 4.0-0 Nf6 5.d3 a5 6.c3
• Italian Game: Classical Variation, Giuoco Pianissimo: 1.e4 e5 2.Nf3 Nc6 3.Bc4 Bc5 4.0-0 Nf6 5.d3 d6 6.c3 a6
• Italian Game: Classical Variation, Giuoco Pianissimo, with h6: 1.e4 e5 2.Nf3 Nc6 3.Bc4 Bc5 4.0-0 Nf6 5.d3 h6
• Italian Game: Classical Variation, Giuoco Pianissimo: 1.e4 e5 2.Nf3 Nc6 3.Bc4 Bc5 4.0-0 Nf6 5.d3 h6 6.c3
• Italian Game: Classical Variation, Giuoco Pianissimo, with h6: 1.e4 e5 2.Nf3 Nc6 3.Bc4 Bc5 4.0-0 Nf6 5.d3 h6 6.c3 d6
• Italian Game: Giuoco Piano, Holzhausen Attack: 1.e4 e5 2.Nf3 Nc6 3.Bc4 Nf6 4.0-0 Bc5 5.d4 Bxd4 6.Nxd4 Nxd4 7.Bg5 d6 8.f4 Qe7 9.fxe5 dxe5 10.Nc3
• Italian Game: Giuoco Piano, Rosentreter Variation: 1.e4 e5 2.Nf3 Nc6 3.Bc4 Nf6 4.0-0 Bc5 5.d4 Bxd4 6.Nxd4 Nxd4 7.Bg5 h6 8.Bh4 g5 9.f4
• Italian Game: Classical Variation, Greco Gambit: 1.e4 e5 2.Nf3 Nc6 3.d4 exd4 4.Bc4 Bc5 5.c3 Nf6 6.e5 d5

• C55 Two Knights Defence
• Italian Game: Two Knights Defense: 1.e4 e5 2.Nf3 Nc6 3.Bc4 Nf6
• Italian Game: Two Knights Defense, Modern Bishop's Opening: 1.e4 e5 2.Nf3 Nc6 3.Bc4 Nf6 4.d3
• Italian Game: Two Knights Defense, Modern Bishop's Opening: 1.e4 e5 2.Nf3 Nc6 3.Bc4 Nf6 4.d3 Be7
• Italian Game: Two Knights Defense: 1.e4 e5 2.Nf3 Nc6 3.Bc4 Nf6 4.0-0 Bc5 5.d4 Bxd4 6.Nxd4 Nxd4 7.Bg5 d6

• C56 Two Knights Defence
• Italian Game: Scotch Gambit, Walbrodt-Baird Gambit: 1.e4 e5 2.Nf3 Nc6 3.Bc4 Bc5 4.c3 Nf6 5.d4 exd4 6.0-0
• Italian Game: Scotch Gambit, Max Lange Attack Accepted: 1.e4 e5 2.Nf3 Nc6 3.Bc4 Bc5 4.0-0 Nf6 5.d4 exd4 6.e5 d5 7.exf6 dxc4 8.Re1+ Be6 9.fxg7
• Italian Game: Two Knights Defense, Open Variation: 1.e4 e5 2.Nf3 Nc6 3.Bc4 Nf6 4.d4
• Italian Game: Scotch Invitation Declined: 1.e4 e5 2.Nf3 Nc6 3.Bc4 Nf6 4.d4 d6
• Italian Game: Scotch Gambit, Max Lange Attack: 1.e4 e5 2.Nf3 Nc6 3.Bc4 Nf6 4.d4 exd4 5.e5 d5 6.Bb5 Ne4
• Italian Game: Two Knights Defense, Keidansky Variation: 1.e4 e5 2.Nf3 Nc6 3.Bc4 Nf6 4.d4 exd4 5.e5 d5 6.Bb5 Ne4 7.Nxd4 Bc5 8.Nxc6 Bxf2+ 9.Kf1 Qh4
• Italian Game: Two Knights Defense, Perreux Variation: 1.e4 e5 2.Nf3 Nc6 3.Bc4 Nf6 4.d4 exd4 5.Ng5
• Italian Game: Scotch Gambit: 1.e4 e5 2.Nf3 Nc6 3.Bc4 Nf6 4.d4 exd4 5.0-0
• Italian Game: Two Knights Defense, Max Lange Attack, Berger Variation: 1.e4 e5 2.Nf3 Nc6 3.Bc4 Nf6 4.d4 exd4 5.0-0 Bc5 6.e5 d5 7.exf6 dxc4 8.Re1+ Be6 9.Ng5 Qd5 10.Nc3 Qf5 11.g4 Qg6 12.Nce4 Bb6 13.f4 0-0-0
• Italian Game: Two Knights Defense, Max Lange Attack, Rubinstein Variation: 1.e4 e5 2.Nf3 Nc6 3.Bc4 Nf6 4.d4 exd4 5.0-0 Bc5 6.e5 d5 7.exf6 dxc4 8.Re1+ Be6 9.Ng5 Qd5 10.Nc3 Qf5 11.Nce4 Bf8
• Italian Game: Two Knights Defense, Max Lange Attack, Krause Variation: 1.e4 e5 2.Nf3 Nc6 3.Bc4 Nf6 4.d4 exd4 5.0-0 Bc5 6.e5 Ng4 7.c3
• Italian Game: Scotch Gambit, Double Gambit Accepted: 1.e4 e5 2.Nf3 Nc6 3.Bc4 Nf6 4.d4 exd4 5.0-0 Nxe4
• Italian Game: Scotch Gambit, Nakhmanson Gambit: 1.e4 e5 2.Nf3 Nc6 3.Bc4 Nf6 4.d4 exd4 5.0-0 Nxe4 6.Nc3
• Italian Game: Scotch Gambit, Anderssen Attack: 1.e4 e5 2.Nf3 Nc6 3.Bc4 Nf6 4.d4 exd4 5.0-0 Nxe4 6.Re1 d5 7.Bxd5 Qxd5 8.Nc3
• Italian Game: Scotch Gambit, Anderssen Attack, Main Line: 1.e4 e5 2.Nf3 Nc6 3.Bc4 Nf6 4.d4 exd4 5.0-0 Nxe4 6.Re1 d5 7.Bxd5 Qxd5 8.Nc3 Qa5 9.Nxe4 Be6 10.Bd2 Qd5 11.Bg5
• Italian Game: Two Knights Defense, Max Lange Attack, Loman Defense: 1.e4 e5 2.Nf3 Nc6 3.d4 exd4 4.Bc4 Bc5 5.0-0 Nf6 6.e5 d5 7.exf6 dxc4 8.Re1+ Be6 9.Ng5 g6
• Italian Game: Scotch Gambit, Max Lange Attack: 1.e4 e5 2.Nf3 Nc6 3.d4 exd4 4.Bc4 Nf6 5.0-0 Bc5
• Italian Game: Two Knights Defense, Max Lange Attack: 1.e4 e5 2.Nf3 Nc6 3.d4 exd4 4.Bc4 Nf6 5.0-0 Bc5 6.e5
• Italian Game: Scotch Gambit, Max Lange Attack, Long Variation: 1.e4 e5 2.Nf3 Nc6 3.d4 exd4 4.Bc4 Nf6 5.0-0 Bc5 6.e5 d5 7.exf6 dxc4 8.Re1+ Be6 9.Ng5 Qd5 10.Nc3 Qf5 11.Nce4
• Italian Game: Scotch Gambit, Max Lange Attack, Spielmann Defense: 1.e4 e5 2.Nf3 Nc6 3.d4 exd4 4.Bc4 Nf6 5.0-0 Bc5 6.e5 Ng4
• Italian Game: Scotch Gambit, de Riviere Defense: 1.e4 e5 2.Nf3 Nc6 3.d4 exd4 4.Bc4 Nf6 5.0-0 Be7
• Italian Game: Scotch Gambit, Janowski Defense: 1.e4 e5 2.Nf3 Nc6 3.d4 exd4 4.Bc4 Nf6 5.0-0 d6
• Italian Game: Two Knights Defense, Yurdansky Attack: 1.e4 e5 2.Nf3 Nc6 3.d4 exd4 4.Bc4 Nf6 5.0-0 Nxe4 6.Re1 d5 7.Bxd5 Qxd5 8.Nc3 Qa5 9.Nxe4 Be6 10.Bg5 h6 11.Bh4 g5 12.Nf6+ Ke7 13.b4
• Italian Game: Scotch Gambit, Canal Variation: 1.e4 e5 2.Nf3 Nc6 3.d4 exd4 4.Bc4 Nf6 5.0-0 Nxe4 6.Re1 d5 7.Nc3

• C57 Two Knights Defence, including the Fried Liver Attack
• Italian Game: Two Knights Defense, Knight Attack: 1.e4 e5 2.Nf3 Nc6 3.Bc4 Nf6 4.Ng5
• Italian Game: Two Knights Defense, Traxler Counterattack: 1.e4 e5 2.Nf3 Nc6 3.Bc4 Nf6 4.Ng5 Bc5
• Italian Game: Two Knights Defense, Traxler Counterattack, Bishop Sacrifice Line: 1.e4 e5 2.Nf3 Nc6 3.Bc4 Nf6 4.Ng5 Bc5 5.Bxf7+
• Italian Game: Two Knights Defense, Traxler Variation, Trencianske-Teplice Gambit: 1.e4 e5 2.Nf3 Nc6 3.Bc4 Nf6 4.Ng5 Bc5 5.Bxf7+ Ke7 6.d4
• Italian Game: Two Knights Defense, Traxler Counterattack, Knight Sacrifice Line: 1.e4 e5 2.Nf3 Nc6 3.Bc4 Nf6 4.Ng5 Bc5 5.Nxf7
• Italian Game: Two Knights Defense, Traxler Counterattack, King March Line: 1.e4 e5 2.Nf3 Nc6 3.Bc4 Nf6 4.Ng5 Bc5 5.Nxf7 Bxf2+ 6.Kxf2 Nxe4+ 7.Ke3
• Italian Game: Two Knights Defense, Knight Attack, Normal Variation: 1.e4 e5 2.Nf3 Nc6 3.Bc4 Nf6 4.Ng5 d5
• Italian Game: Two Knights Defense, Ulvestad Variation: 1.e4 e5 2.Nf3 Nc6 3.Bc4 Nf6 4.Ng5 d5 5.exd5 b5
• Italian Game: Two Knights Defense, Ulvestad Variation, Kurkin Gambit: 1.e4 e5 2.Nf3 Nc6 3.Bc4 Nf6 4.Ng5 d5 5.exd5 b5 6.Bf1 h6 7.Nxf7
• Italian Game: Two Knights Defense, Kloss Gambit: 1.e4 e5 2.Nf3 Nc6 3.Bc4 Nf6 4.Ng5 d5 5.exd5 Nb4
• Italian Game: Two Knights Defense, Fritz Variation: 1.e4 e5 2.Nf3 Nc6 3.Bc4 Nf6 4.Ng5 d5 5.exd5 Nd4
• Italian Game: Two Knights Defense, Fritz, Gruber Variation: 1.e4 e5 2.Nf3 Nc6 3.Bc4 Nf6 4.Ng5 d5 5.exd5 Nd4 6.c3 b5 7.Bf1 Nxd5 8.Ne4
• Italian Game: Two Knights Defense, Lolli Attack: 1.e4 e5 2.Nf3 Nc6 3.Bc4 Nf6 4.Ng5 d5 5.exd5 Nxd5 6.d4
• Italian Game: Two Knights Defense, Pincus Variation: 1.e4 e5 2.Nf3 Nc6 3.Bc4 Nf6 4.Ng5 d5 5.exd5 Nxd5 6.d4 Bb4+
• Italian Game: Two Knights Defense, Fried Liver Attack: 1.e4 e5 2.Nf3 Nc6 3.Bc4 Nf6 4.Ng5 d5 5.exd5 Nxd5 6.Nxf7
• Italian Game: Two Knights Defense, Fegatello Attack, Leonhardt Variation: 1.e4 e5 2.Nf3 Nc6 3.Bc4 Nf6 4.Ng5 d5 5.exd5 Nxd5 6.Nxf7 Kxf7 7.Qf3+ Ke6 8.Nc3 Nb4 9.Qe4 c6 10.a3 Na6 11.d4 Nc7
• Italian Game: Two Knights Defense, Ponziani-Steinitz Gambit: 1.e4 e5 2.Nf3 Nc6 3.Bc4 Nf6 4.Ng5 Nxe4

• C58 Two Knights Defence
• Italian Game: Two Knights Defense, Polerio Defense: 1.e4 e5 2.Nf3 Nc6 3.Bc4 Nf6 4.Ng5 d5 5.exd5 Na5
• Italian Game: Two Knights Defense, Polerio Defense, Bishop Check Line: 1.e4 e5 2.Nf3 Nc6 3.Bc4 Nf6 4.Ng5 d5 5.exd5 Na5 6.Bb5+
• Italian Game: Two Knights Defense: 1.e4 e5 2.Nf3 Nc6 3.Bc4 Nf6 4.Ng5 d5 5.exd5 Na5 6.Bb5+ c6 7.dxc6 bxc6 8.Be2
• Italian Game: Two Knights Defense, Polerio Defense, Bogoljubow Variation: 1.e4 e5 2.Nf3 Nc6 3.Bc4 Nf6 4.Ng5 d5 5.exd5 Na5 6.Bb5+ c6 7.dxc6 bxc6 8.Qf3
• Italian Game: Two Knights Defense, Blackburne Variation: 1.e4 e5 2.Nf3 Nc6 3.Bc4 Nf6 4.Ng5 d5 5.exd5 Na5 6.Bb5+ c6 7.dxc6 bxc6 8.Qf3 cxb5
• Italian Game: Two Knights Defense, Paoli Variation: 1.e4 e5 2.Nf3 Nc6 3.Bc4 Nf6 4.Ng5 d5 5.exd5 Na5 6.Bb5+ c6 7.dxc6 bxc6 8.Qf3 Qc7 9.Bd3
• Italian Game: Two Knights Defense, Colman Variation: 1.e4 e5 2.Nf3 Nc6 3.Bc4 Nf6 4.Ng5 d5 5.exd5 Na5 6.Bb5+ c6 7.dxc6 bxc6 8.Qf3 Rb8
• Italian Game: Two Knights Defense, Polerio Defense, Kieseritzky Variation: 1.e4 e5 2.Nf3 Nc6 3.Bc4 Nf6 4.Ng5 d5 5.exd5 Na5 6.d3
• Italian Game: Two Knights Defense, Polerio Defense, Yankovich Variation: 1.e4 e5 2.Nf3 Nc6 3.Bc4 Nf6 4.Ng5 d5 5.exd5 Na5 6.d3 h6 7.Nf3 e4 8.Qe2 Nxc4 9.dxc4 Bc5 10.Nfd2
• Italian Game: Two Knights Defense, Maróczy Variation: 1.e4 e5 2.Nf3 Nc6 3.Bc4 Nf6 4.Ng5 d5 5.exd5 Na5 6.d3 h6 7.Nf3 e4 8.Qe2 Nxc4 9.dxc4 Be7

• C59 Two Knights Defence
• Italian Game: Two Knights Defense, Polerio Defense, Suhle Defense: 1.e4 e5 2.Nf3 Nc6 3.Bc4 Nf6 4.Ng5 d5 5.exd5 Na5 6.Bb5+ c6 7.dxc6 bxc6 8.Be2 h6
• Italian Game: Two Knights Defense, Knorre Variation: 1.e4 e5 2.Nf3 Nc6 3.Bc4 Nf6 4.Ng5 d5 5.exd5 Na5 6.Bb5+ c6 7.dxc6 bxc6 8.Be2 h6 9.Nf3 e4 10.Ne5 Bd6 11.d4 Qc7 12.Bd2
• Italian Game: Two Knights Defense, Polerio Defense, Göring Variation: 1.e4 e5 2.Nf3 Nc6 3.Bc4 Nf6 4.Ng5 d5 5.exd5 Na5 6.Bb5+ c6 7.dxc6 bxc6 8.Be2 h6 9.Nf3 e4 10.Ne5 Qc7
• Italian Game: Two Knights Defense, Steinitz Variation: 1.e4 e5 2.Nf3 Nc6 3.Bc4 Nf6 4.Ng5 d5 5.exd5 Na5 6.Bb5+ c6 7.dxc6 bxc6 8.Be2 h6 9.Nh3

• C60 Ruy Lopez Unusual Black 3rd moves and 3...g6
• Ruy Lopez: 1.e4 e5 2.Nf3 Nc6 3.Bb5
• Ruy Lopez: Bulgarian Variation: 1.e4 e5 2.Nf3 Nc6 3.Bb5 a5
• Ruy Lopez: Rotary-Albany Gambit: 1.e4 e5 2.Nf3 Nc6 3.Bb5 b6
• Ruy Lopez: Alapin Defense: 1.e4 e5 2.Nf3 Nc6 3.Bb5 Bb4
• Ruy Lopez: Alapin Defense, Alapin Gambit: 1.e4 e5 2.Nf3 Nc6 3.Bb5 Bb4 4.c3 Ba5 5.Bxc6 dxc6
• Ruy Lopez: Lucena Variation: 1.e4 e5 2.Nf3 Nc6 3.Bb5 Be7
• Ruy Lopez: Spanish Countergambit: 1.e4 e5 2.Nf3 Nc6 3.Bb5 d5
• Ruy Lopez: Spanish Countergambit, Harding Gambit: 1.e4 e5 2.Nf3 Nc6 3.Bb5 d5 4.Nxe5 Qg5 5.Nxc6
• Ruy Lopez: Spanish Countergambit, Harding Countergambit, Fricke Gambit: 1.e4 e5 2.Nf3 Nc6 3.Bb5 d5 4.Nxe5 Qg5 5.0-0
• Ruy Lopez: Nürnberg Variation: 1.e4 e5 2.Nf3 Nc6 3.Bb5 f6
• Ruy Lopez: Brentano Gambit: 1.e4 e5 2.Nf3 Nc6 3.Bb5 g5
• Ruy Lopez: Fianchetto Defense: 1.e4 e5 2.Nf3 Nc6 3.Bb5 g6
• Ruy Lopez: Fianchetto Defense, Kevitz Gambit: 1.e4 e5 2.Nf3 Nc6 3.Bb5 g6 4.c3 f5
• Ruy Lopez: Cozio Defense, Tartakower Gambit: 1.e4 e5 2.Nf3 Nc6 3.Bb5 g6 4.d4 exd4 5.Nxd4 Bg7 6.Be3 Nge7 7.Nc3 0-0 8.Qd2 d5
• Ruy Lopez: Pollock Defense: 1.e4 e5 2.Nf3 Nc6 3.Bb5 Na5
• Ruy Lopez: Retreat Variation: 1.e4 e5 2.Nf3 Nc6 3.Bb5 Nb8
• Ruy Lopez: Cozio Defense: 1.e4 e5 2.Nf3 Nc6 3.Bb5 Nge7
• Ruy Lopez: Cozio Defense, Paulsen Variation: 1.e4 e5 2.Nf3 Nc6 3.Bb5 Nge7 4.Nc3 g6
• Ruy Lopez: Vinogradov Variation: 1.e4 e5 2.Nf3 Nc6 3.Bb5 Qe7

• C61 Ruy Lopez, Bird's Defence
• Ruy Lopez: Bird Variation: 1.e4 e5 2.Nf3 Nc6 3.Bb5 Nd4
• Ruy Lopez: Bird Variation, Paulsen Variation: 1.e4 e5 2.Nf3 Nc6 3.Bb5 Nd4 4.Nxd4 exd4 5.0-0 Ne7

• C62 Ruy Lopez, Old Steinitz Defence
• Ruy Lopez: Steinitz Defense: 1.e4 e5 2.Nf3 Nc6 3.Bb5 d6
• Ruy Lopez: Old Steinitz Defense, Semi-Duras Variation: 1.e4 e5 2.Nf3 Nc6 3.Bb5 d6 4.d4 Bd7 5.c4
• Ruy Lopez: Steinitz Defense, Nimzowitsch Attack: 1.e4 e5 2.Nf3 Nc6 3.Bb5 d6 4.d4 Bd7 5.Nc3 Nf6 6.Bxc6
• Ruy Lopez: Steinitz Defense, Center Gambit: 1.e4 e5 2.Nf3 Nc6 3.Bb5 d6 4.d4 exd4 5.0-0

• C63 Ruy Lopez, Schliemann Defence
• Ruy Lopez: Schliemann Defense: 1.e4 e5 2.Nf3 Nc6 3.Bb5 f5
• Ruy Lopez: Schliemann Defense, Exchange Variation: 1.e4 e5 2.Nf3 Nc6 3.Bb5 f5 4.Bxc6
• Ruy Lopez: Schliemann Defense, Schönemann Attack: 1.e4 e5 2.Nf3 Nc6 3.Bb5 f5 4.d4
• Ruy Lopez: Schliemann Defense, Jaenisch Gambit Accepted: 1.e4 e5 2.Nf3 Nc6 3.Bb5 f5 4.exf5
• Ruy Lopez: Schliemann Defense, Dyckhoff Variation: 1.e4 e5 2.Nf3 Nc6 3.Bb5 f5 4.Nc3
• Ruy Lopez: Schliemann Defense, Kostić Defense: 1.e4 e5 2.Nf3 Nc6 3.Bb5 f5 4.Nc3 fxe4 5.Nxe4 Be7
• Ruy Lopez: Schliemann Defense, Möhring Variation: 1.e4 e5 2.Nf3 Nc6 3.Bb5 f5 4.Nc3 fxe4 5.Nxe4 d5 6.Nxe5 dxe4 7.Nxc6 Qd5
• Ruy Lopez: Schliemann Defense, Classical Variation: 1.e4 e5 2.Nf3 Nc6 3.Bb5 f5 4.Nc3 fxe4 5.Nxe4 d5 6.Nxe5 dxe4 7.Nxc6 Qg5
• Ruy Lopez: Schliemann Defense, Tartakower Variation: 1.e4 e5 2.Nf3 Nc6 3.Bb5 f5 4.Nc3 fxe4 5.Nxe4 Nf6

• C64 Ruy Lopez, Classical (Cordel) Defence
• Ruy Lopez: Classical Variation: 1.e4 e5 2.Nf3 Nc6 3.Bb5 Bc5
• Ruy Lopez: Classical Variation, Spanish Wing Gambit: 1.e4 e5 2.Nf3 Nc6 3.Bb5 Bc5 4.b4
• Ruy Lopez: Classical Variation, Central Variation: 1.e4 e5 2.Nf3 Nc6 3.Bb5 Bc5 4.c3
• Ruy Lopez: Classical Variation, Charousek Variation: 1.e4 e5 2.Nf3 Nc6 3.Bb5 Bc5 4.c3 Bb6
• Ruy Lopez: Classical Variation, Konikowski Gambit: 1.e4 e5 2.Nf3 Nc6 3.Bb5 Bc5 4.c3 d5
• Ruy Lopez: Classical Variation, Cordel Gambit: 1.e4 e5 2.Nf3 Nc6 3.Bb5 Bc5 4.c3 f5
• Ruy Lopez: Classical Defense, Boden Variation: 1.e4 e5 2.Nf3 Nc6 3.Bb5 Bc5 4.c3 Qe7
• Ruy Lopez: Classical Defense, Zaitsev Variation: 1.e4 e5 2.Nf3 Nc6 3.Bb5 Bc5 4.0-0 Nd4 5.b4
• Ruy Lopez: Classical Defense, Benelux Variation: 1.e4 e5 2.Nf3 Nc6 3.Bb5 Nf6 4.0-0 Bc5 5.c3 0-0 6.d4 Bb6
• Ruy Lopez: Classical Variation, Modern Main Line: 1.e4 e5 2.Nf3 Nc6 3.Bb5 Nf6 4.0-0 Bc5 5.c3 0-0 6.d4 Bb6 7.Bg5

• C65 Ruy Lopez, Berlin Defence including Mortimer Trap
• Ruy Lopez: Berlin Defense: 1.e4 e5 2.Nf3 Nc6 3.Bb5 Nf6
• Ruy Lopez: Berlin Defense, Kaufmann Variation: 1.e4 e5 2.Nf3 Nc6 3.Bb5 Nf6 4.d3 Bc5 5.Be3
• Ruy Lopez: Berlin Defense, Anderssen Variation: 1.e4 e5 2.Nf3 Nc6 3.Bb5 Nf6 4.d3 d6 5.Bxc6+
• Ruy Lopez: Berlin Defense, Duras Variation: 1.e4 e5 2.Nf3 Nc6 3.Bb5 Nf6 4.d3 d6 5.c4
• Ruy Lopez: Berlin Defense, Mortimer Variation: 1.e4 e5 2.Nf3 Nc6 3.Bb5 Nf6 4.d3 Ne7
• Ruy Lopez: Berlin Defense, Mortimer Trap: 1.e4 e5 2.Nf3 Nc6 3.Bb5 Nf6 4.d3 Ne7 5.Nxe5 c6
• Ruy Lopez: Berlin Defense, Nyholm Attack: 1.e4 e5 2.Nf3 Nc6 3.Bb5 Nf6 4.d4 exd4 5.0-0
• Ruy Lopez: Halloween Attack: 1.e4 e5 2.Nf3 Nc6 3.Bb5 Nf6 4.Nxe5
• Ruy Lopez: Berlin Defense: 1.e4 e5 2.Nf3 Nc6 3.Bb5 Nf6 4.0-0
• Ruy Lopez: Berlin Defense, Beverwijk Variation: 1.e4 e5 2.Nf3 Nc6 3.Bb5 Nf6 4.0-0 Bc5
• Ruy Lopez: Classical Variation, Zukertort Gambit: 1.e4 e5 2.Nf3 Nc6 3.Bb5 Nf6 4.0-0 Bc5 5.c3
• Ruy Lopez: Berlin Defense, Fishing Pole Variation: 1.e4 e5 2.Nf3 Nc6 3.Bb5 Nf6 4.0-0 Ng4

• C66 Ruy Lopez, Berlin Defence, 4.0-0 d6
• Ruy Lopez: Berlin Defense, Tarrasch Trap: 1.e4 e5 2.Nf3 Nc6 3.Bb5 d6 4.d4 Bd7 5.Nc3 Nf6 6.0-0 Be7 7.Re1 0-0
• Ruy Lopez: Berlin Defense, Improved Steinitz Defense: 1.e4 e5 2.Nf3 Nc6 3.Bb5 Nf6 4.0-0 d6
• Ruy Lopez: Berlin Defense, Hedgehog Variation: 1.e4 e5 2.Nf3 Nc6 3.Bb5 Nf6 4.0-0 d6 5.d4 Bd7 6.Nc3 Be7
• Ruy Lopez: Berlin Defense, Closed Bernstein Variation: 1.e4 e5 2.Nf3 Nc6 3.Bb5 Nf6 4.0-0 d6 5.d4 Bd7 6.Nc3 Be7 7.Bg5
• Ruy Lopez: Berlin Defense, Closed Showalter Variation: 1.e4 e5 2.Nf3 Nc6 3.Bb5 Nf6 4.0-0 d6 5.d4 Bd7 6.Nc3 Be7 7.Bxc6
• Ruy Lopez: Berlin Defense, Closed Wolf Variation: 1.e4 e5 2.Nf3 Nc6 3.Bb5 Nf6 4.0-0 d6 5.d4 Bd7 6.Nc3 exd4
• Ruy Lopez: Closed Berlin Defense, Chigorin Variation: 1.e4 e5 2.Nf3 Nc6 3.Bb5 Nf6 4.0-0 d6 5.d4 Nd7

• C67 Ruy Lopez, Berlin Defence, Open Variation
• Ruy Lopez: Berlin Defense, Rio Gambit Accepted: 1.e4 e5 2.Nf3 Nc6 3.Bb5 Nf6 4.0-0 Nxe4
• Ruy Lopez: Berlin Defense, Rosenthal Variation: 1.e4 e5 2.Nf3 Nc6 3.Bb5 Nf6 4.0-0 Nxe4 5.d4 a6
• Ruy Lopez: Berlin Defense, Rio de Janeiro Variation: 1.e4 e5 2.Nf3 Nc6 3.Bb5 Nf6 4.0-0 Nxe4 5.d4 Be7
• Ruy Lopez: Berlin Defense, Minckwitz Variation: 1.e4 e5 2.Nf3 Nc6 3.Bb5 Nf6 4.0-0 Nxe4 5.d4 Be7 6.dxe5
• Ruy Lopez: Berlin Defense, Trifunovic Variation: 1.e4 e5 2.Nf3 Nc6 3.Bb5 Nf6 4.0-0 Nxe4 5.d4 Be7 6.Qe2 d5
• Ruy Lopez: Berlin Defense, Pillsbury Variation: 1.e4 e5 2.Nf3 Nc6 3.Bb5 Nf6 4.0-0 Nxe4 5.d4 Be7 6.Qe2 Nd6 7.Bxc6 bxc6 8.dxe5 Nb7 9.b3
• Ruy Lopez: Berlin Defense, Zukertort Variation: 1.e4 e5 2.Nf3 Nc6 3.Bb5 Nf6 4.0-0 Nxe4 5.d4 Be7 6.Qe2 Nd6 7.Bxc6 bxc6 8.dxe5 Nb7 9.c4
• Ruy Lopez: Berlin Defense, Rio de Janeiro Variation: 1.e4 e5 2.Nf3 Nc6 3.Bb5 Nf6 4.0-0 Nxe4 5.d4 Be7 6.Qe2 Nd6 7.Bxc6 bxc6 8.dxe5 Nb7 9.Nc3 0-0 10.Re1 Nc5 11.Nd4 Ne6 12.Be3 Nxd4 13.Bxd4 c5
• Ruy Lopez: Berlin Defense, Winawer Attack: 1.e4 e5 2.Nf3 Nc6 3.Bb5 Nf6 4.0-0 Nxe4 5.d4 Be7 6.Qe2 Nd6 7.Bxc6 bxc6 8.dxe5 Nb7 9.Nd4
• Ruy Lopez: Berlin Defense, Cordel Variation: 1.e4 e5 2.Nf3 Nc6 3.Bb5 Nf6 4.0-0 Nxe4 5.d4 Be7 6.Qe2 Nd6 7.Bxc6 bxc6 8.dxe5 Nf5
• Ruy Lopez: Berlin Defense, l'Hermet Variation: 1.e4 e5 2.Nf3 Nc6 3.Bb5 Nf6 4.0-0 Nxe4 5.d4 Nd6
• Ruy Lopez: Open Berlin Defense, Showalter Variation: 1.e4 e5 2.Nf3 Nc6 3.Bb5 Nf6 4.0-0 Nxe4 5.d4 Nd6 6.Ba4
• Ruy Lopez: Berlin Defense, l'Hermet Variation, Westerinen Line: 1.e4 e5 2.Nf3 Nc6 3.Bb5 Nf6 4.0-0 Nxe4 5.d4 Nd6 6.Bxc6 dxc6 7.dxe5 Ne4
• Ruy Lopez: Berlin Defense, l'Hermet Variation, Berlin Wall Defense: 1.e4 e5 2.Nf3 Nc6 3.Bb5 Nf6 4.0-0 Nxe4 5.d4 Nd6 6.Bxc6 dxc6 7.dxe5 Nf5 8.Qxd8+ Kxd8
• Ruy Lopez: Berlin Defense, Berlin Wall: 1.e4 e5 2.Nf3 Nc6 3.Bb5 Nf6 4.0-0 Nxe4 5.d4 Nd6 6.Bxc6 dxc6 7.dxe5 Nf5 8.Qxd8+ Kxd8 9.Nc3 Bd7
• Ruy Lopez: Open Berlin Defense, l'Hermet Variation: 1.e4 e5 2.Nf3 Nc6 3.Bb5 Nf6 4.0-0 Nxe4 5.d4 Nd6 6.dxe5

• C68 Ruy Lopez, Exchange Variation
• Ruy Lopez: Exchange Variation: 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Bxc6
• Ruy Lopez: Exchange Variation, Lutikov Variation: 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Bxc6 bxc6
• Ruy Lopez: Exchange Variation, Alekhine Variation: 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Bxc6 dxc6 5.d4 exd4 6.Qxd4 Qxd4 7.Nxd4 Bd6
• Ruy Lopez: Exchange, Alekhine Variation: 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Bxc6 dxc6 5.d4 exd4 6.Qxd4 Qxd4 7.Nxd4 Bd7
• Ruy Lopez: Exchange Variation, Keres Variation: 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Bxc6 dxc6 5.Nc3
• Ruy Lopez: Exchange Variation, Romanovsky Variation: 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Bxc6 dxc6 5.Nc3 f6 6.d3

• C69 Ruy Lopez, Exchange Variation, 5.0-0
• Ruy Lopez: Exchange Variation, Normal Variation: 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Bxc6 dxc6 5.0-0
• Ruy Lopez: Exchange Variation, King's Bishop Variation: 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Bxc6 dxc6 5.0-0 Bd6
• Ruy Lopez: Exchange Variation, Alapin Gambit: 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Bxc6 dxc6 5.0-0 Bg4 6.h3 h5
• Ruy Lopez: Exchange Variation, Gligoric Variation: 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Bxc6 dxc6 5.0-0 f6
• Ruy Lopez: Exchange Variation, Bronstein Variation: 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Bxc6 dxc6 5.0-0 Qd6

• C70 Ruy Lopez, 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4
• Ruy Lopez: Morphy Defense: 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6
• Ruy Lopez: Morphy Defense, Caro Variation: 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 b5
• Ruy Lopez: Morphy Defense, Graz Variation: 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 b5 5.Bb3 Bc5
• Ruy Lopez: Morphy Defense, Norwegian Variation: 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 b5 5.Bb3 Na5
• Ruy Lopez: Morphy Defense, Norwegian Variation, Nightingale Gambit: 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 b5 5.Bb3 Na5 6.Bxf7+
• Ruy Lopez: Morphy Defense, Alapin's Defense Deferred: 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Bb4
• Ruy Lopez: Morphy Defense, Classical Defense Deferred: 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Bc5
• Ruy Lopez: Morphy Defense, Schliemann Defense Deferred: 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 f5
• Ruy Lopez: Morphy Defense, Schliemann Defense Deferred, Jaenisch Gambit Deferred: 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 f5 5.exf5
• Ruy Lopez: Morphy Defense, Fianchetto Defense Deferred: 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 g6
• Ruy Lopez: Bird's Defense Deferred: 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nd4
• Ruy Lopez: Morphy Defense, Cozio Defense: 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nge7

• C71 Ruy Lopez, Modern Steinitz Defence including Noah's Ark Trap
• Ruy Lopez: Noah's Ark Trap: 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 b5 5.Bb3 d6 6.d4 Nxd4 7.Nxd4 exd4 8.Qxd4 c5
• Ruy Lopez: Morphy Defense, Modern Steinitz Defense: 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 d6
• Ruy Lopez: Morphy Defense, Modern Steinitz Defense: 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 d6 5.c4
• Ruy Lopez: Morphy Defense, Modern Steinitz Defense: 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 d6 5.Nc3

• C72 Ruy Lopez, Modern Steinitz Defence 5.0-0
• Ruy Lopez: Morphy Defense, Modern Steinitz Defense: 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 d6 5.0-0
• Ruy Lopez: Closed, Kecskemet Variation: 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 d6 5.0-0 Bd7 6.c3 Nf6 7.d4 Be7 8.Nbd2 0-0 9.Re1 Be8

• C73 Ruy Lopez, Modern Steinitz Defence, Richter Variation
• Ruy Lopez: Morphy Defense, Modern Steinitz Defense: 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 d6 5.Bxc6+ bxc6 6.d4
• Ruy Lopez: Morphy Defense, Modern Steinitz Defense: 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 d6 5.Bxc6+ bxc6 6.d4 f6

• C74 Ruy Lopez, Modern Steinitz Defence
• Ruy Lopez: Morphy Defense, Modern Steinitz Defense: 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 d6 5.c3
• Ruy Lopez: Morphy Defense, Modern Steinitz Defense, Siesta Variation: 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 d6 5.c3 f5
• Ruy Lopez: Morphy Defense, Modern Steinitz Defense: 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 d6 5.c3 f5 6.exf5 Bxf5 7.0-0

• C75 Ruy Lopez, Modern Steinitz Defence
• Ruy Lopez: Morphy Defense, Modern Steinitz Defense: 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 d6 5.c3 Bd7
• Ruy Lopez: Morphy Defense, Modern Steinitz Defense: 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 d6 5.c3 Bd7 6.d4 Nge7

• C76 Ruy Lopez, Modern Steinitz Defence, Fianchetto (Bronstein) Variation
• Ruy Lopez: Morphy Defense, Modern Steinitz Defense, Fianchetto Variation: 1.e4 e5 2.Nf3 Nc6 3.Bb5 g6 4.c3 a6 5.Ba4 d6 6.d4 Bd7

• C77 Ruy Lopez, Morphy Defence
• Ruy Lopez: Morphy Defense, Bayreuth Variation: 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.Bxc6
• Ruy Lopez: Morphy Defense, Jaffe Gambit: 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.c3
• Ruy Lopez: Morphy Defense, Anderssen Variation: 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.d3
• Ruy Lopez: Morphy Defense, Duras Variation: 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.d3 d6 6.c4
• Ruy Lopez: Morphy Defense, Mackenzie Variation: 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.d4
• Ruy Lopez: Morphy Defense, Tarrasch Variation: 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.Nc3
• Ruy Lopez: Morphy Defense, Wormald Attack: 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.Qe2
• Ruy Lopez: Wormald Attack, Grünfeld Variation: 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.Qe2 b5 6.Bb3 Be7 7.d4 d6 8.c3 Bg4

• C78 Ruy Lopez, 5.0-0
• Ruy Lopez: Morphy Defense: 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.0-0
• Ruy Lopez: Morphy Defense, Arkhangelsk Variation: 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.0-0 b5 6.Bb3 Bb7
• Ruy Lopez: Morphy Defense, Wing Attack: 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.0-0 b5 6.Bb3 Be7 7.a4
• Ruy Lopez: Morphy Defense: 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.0-0 b5 6.Bb3 d6
• Ruy Lopez: Rabinovich Variation: 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.0-0 b5 6.Bb3 d6 7.Ng5 d5 8.exd5 Nd4 9.Re1 Bc5 10.Rxe5+ Kf8
• Ruy Lopez: Morphy Defense, Neo-Arkhangelsk Variation: 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.0-0 Bc5
• Ruy Lopez: Central Countergambit: 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.0-0 d5
• Ruy Lopez: Brix Variation: 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.0-0 g6

• C79 Ruy Lopez, Steinitz Defence Deferred (Russian Defence)
• Ruy Lopez: Morphy Defense, Steinitz Deferred: 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.0-0 d6
• Ruy Lopez: Steinitz Defense Deferred, Lipnitsky Variation: 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.0-0 d6 6.Bxc6+ bxc6 7.d4 Bg4
• Ruy Lopez: Morphy Defense, Steinitz Deferred: 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.0-0 d6 6.Bxc6+ bxc6 7.d4 Nxe4
• Ruy Lopez: Steinitz Defense Deferred, Boleslavsky Variation: 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.0-0 d6 6.Bxc6+ bxc6 7.d4 Nxe4 8.Re1 f5 9.dxe5 d5 10.Nc3

• C80 Ruy Lopez, Open (Tarrasch) Defence
• Ruy Lopez: Open: 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.0-0 Nxe4
• Ruy Lopez: Open: 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.0-0 Nxe4 6.d4
• Ruy Lopez: Open: 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.0-0 Nxe4 6.d4 b5 7.Bb3
• Ruy Lopez: Open, Schlechter Defense: 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.0-0 Nxe4 6.d4 b5 7.Bb3 d5 8.a4 Nxd4
• Ruy Lopez: Open, Berger Variation: 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.0-0 Nxe4 6.d4 b5 7.Bb3 d5 8.a4 Nxd4 9.Nxd4 exd4 10.Nc3
• Ruy Lopez: Open, Harksen Gambit: 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.0-0 Nxe4 6.d4 b5 7.Bb3 d5 8.c4
• Ruy Lopez: Open: 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.0-0 Nxe4 6.d4 b5 7.Bb3 d5 8.dxe5
• Ruy Lopez: Open, Main Line: 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.0-0 Nxe4 6.d4 b5 7.Bb3 d5 8.dxe5 Be6
• Ruy Lopez: Open, Bernstein Variation: 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.0-0 Nxe4 6.d4 b5 7.Bb3 d5 8.dxe5 Be6 9.Nbd2
• Ruy Lopez: Open, Bernstein Variation, Luther Line: 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.0-0 Nxe4 6.d4 b5 7.Bb3 d5 8.dxe5 Be6 9.Nbd2 Bc5 10.Qe1
• Ruy Lopez: Open, Karpov Gambit: 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.0-0 Nxe4 6.d4 b5 7.Bb3 d5 8.dxe5 Be6 9.Nbd2 Nc5 10.c3 d4 11.Ng5
• Ruy Lopez: Open, Zukertort Variation: 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.0-0 Nxe4 6.d4 b5 7.Bb3 d5 8.dxe5 Ne7
• Ruy Lopez: Open, Richter Variation: 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.0-0 Nxe4 6.d4 b5 7.d5
• Ruy Lopez: Open, Friess Attack: 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.0-0 Nxe4 6.d4 b5 7.Nxe5
• Ruy Lopez: Open, Riga Variation: 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.0-0 Nxe4 6.d4 exd4
• Ruy Lopez: Open, Knorre Variation: 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.0-0 Nxe4 6.Nc3
• Ruy Lopez: Morphy Defense, Tartakower Variation: 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.0-0 Nxe4 6.Qe2
• Ruy Lopez: Open, Skipworth Gambit: 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.0-0 Nxe4 6.Re1 d5

• C81 Ruy Lopez, Open, Howell Attack
• Ruy Lopez: Open, Howell Attack: 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.0-0 Nxe4 6.d4 b5 7.Bb3 d5 8.dxe5 Be6 9.Qe2
• Ruy Lopez: Open, Howell Attack: 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.0-0 Nxe4 6.d4 b5 7.Bb3 d5 8.dxe5 Be6 9.Qe2 Be7 10.c4
• Ruy Lopez: Open, Howell Attack, Ekstrom Variation: 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.0-0 Nxe4 6.d4 b5 7.Bb3 d5 8.dxe5 Be6 9.Qe2 Be7 10.Rd1 0-0 11.c4 bxc4 12.Bxc4 Qd7

• C82 Ruy Lopez, Open, 9.c3
• Ruy Lopez: Open: 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.0-0 Nxe4 6.d4 b5 7.Bb3 d5 8.dxe5 Be6 9.c3
• Ruy Lopez: Open, Italian Variation: 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.0-0 Nxe4 6.d4 b5 7.Bb3 d5 8.dxe5 Be6 9.c3 Bc5
• Ruy Lopez: Open, St. Petersburg Variation: 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.0-0 Nxe4 6.d4 b5 7.Bb3 d5 8.dxe5 Be6 9.c3 Bc5 10.Nbd2
• Ruy Lopez: Open, Dilworth Variation: 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.0-0 Nxe4 6.d4 b5 7.Bb3 d5 8.dxe5 Be6 9.c3 Bc5 10.Nbd2 0-0 11.Bc2 Nxf2
• Ruy Lopez: Open, Motzko Attack: 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.0-0 Nxe4 6.d4 b5 7.Bb3 d5 8.dxe5 Be6 9.c3 Bc5 10.Qd3
• Ruy Lopez: Open, Motzko Attack, Nenarokov Variation: 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.0-0 Nxe4 6.d4 b5 7.Bb3 d5 8.dxe5 Be6 9.c3 Bc5 10.Qd3 Ne7
• Ruy Lopez: Open, Berlin Variation: 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.0-0 Nxe4 6.d4 b5 7.Bb3 d5 8.dxe5 Be6 9.c3 Nc5

• C83 Ruy Lopez, Open, Classical Defence
• Ruy Lopez: Open, Classical Defense: 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.0-0 Nxe4 6.d4 b5 7.Bb3 d5 8.dxe5 Be6 9.c3 Be7
• Ruy Lopez: Open, Malkin Variation: 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.0-0 Nxe4 6.d4 b5 7.Bb3 d5 8.dxe5 Be6 9.c3 Be7 10.Nbd2 0-0 11.Qe2
• Ruy Lopez: Open, Breslau Variation: 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.0-0 Nxe4 6.d4 b5 7.Bb3 d5 8.dxe5 Be6 9.c3 Be7 10.Re1 0-0 11.Nd4 Nxe5
• Ruy Lopez: Open, Tarrasch Trap: 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.0-0 Nxe4 6.d4 b5 7.Bb3 d5 8.dxe5 Be6 9.c3 Be7 10.Re1 0-0 11.Nd4 Qd7 12.Nxe6 fxe6 13.Rxe4
• Ruy Lopez: Open, Classical Defense, Main Line: 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.0-0 Nxe4 6.d4 Be7 7.Re1 b5 8.Bb3 d5 9.dxe5 Be6 10.c3

• C84 Ruy Lopez, Closed Defence
• Ruy Lopez: Closed: 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.0-0 Be7
• Ruy Lopez: Closed, Martinez Variation: 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.0-0 Be7 6.d3
• Ruy Lopez: Closed, Center Attack: 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.0-0 Be7 6.d4
• Ruy Lopez: Closed, Basque Gambit: 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.0-0 Be7 6.d4 exd4 7.e5 Ne4 8.c3
• Ruy Lopez: Closed, Center Attack, Basque Gambit: 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.0-0 Be7 6.d4 exd4 7.e5 Ne4 8.c3 dxc3
• Ruy Lopez: Closed, Morphy Attack: 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.0-0 Be7 6.Nc3

• C85 Ruy Lopez, Exchange Variation Doubly Deferred (DERLD)
• Ruy Lopez: Closed, Delayed Exchange: 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.0-0 Be7 6.Bxc6

• C86 Ruy Lopez, Worrall Attack
• Ruy Lopez: Closed, Worrall Attack: 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.0-0 Be7 6.Qe2
• Ruy Lopez: Closed, Worrall Attack, Delayed Castling Line: 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.0-0 Be7 6.Qe2 b5 7.Bb3 d6
• Ruy Lopez: Closed, Worrall Attack, Castling Line: 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.0-0 Be7 6.Qe2 b5 7.Bb3 0-0

• C87 Ruy Lopez, Closed, Averbakh Variation
• Ruy Lopez: Closed, Averbakh Variation: 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.0-0 Be7 6.Re1 d6

• C88 Ruy Lopez, Closed
• Ruy Lopez: Closed: 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.0-0 Be7 6.Re1 b5 7.Bb3
• Ruy Lopez: Closed, Trajkovic Counterattack: 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.0-0 Be7 6.Re1 b5 7.Bb3 Bb7
• Ruy Lopez: Closed, Balla Variation: 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.0-0 Be7 6.Re1 b5 7.Bb3 d6 8.c3 Na5 9.Bc2 c5 10.d4 Qc7 11.a4
• Ruy Lopez: Closed, Leonhardt Variation: 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.0-0 Be7 6.Re1 b5 7.Bb3 d6 8.c3 Na5 9.Bc2 c5 10.d4 Qc7 11.h3 Nc6 12.d5 Nb8 13.Nbd2 g5
• Ruy Lopez: Closed, Alekhine Gambit: 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.0-0 Be7 6.Re1 b5 7.Bb3 d6 8.c3 Na5 9.Bc2 c5 10.d4 Qc7 11.Nbd2 0-0 12.Nf1 Bg4 13.Ne3 Bxf3 14.Qxf3
• Ruy Lopez: Closed, Rosen Attack: 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.0-0 Be7 6.Re1 b5 7.Bb3 d6 8.d4
• Ruy Lopez: Noah's Ark Trap: 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.0-0 Be7 6.Re1 b5 7.Bb3 d6 8.d4 Nxd4 9.Nxd4 exd4 10.Qxd4 c5
• Ruy Lopez: Closed: 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.0-0 Be7 6.Re1 b5 7.Bb3 0-0
• Ruy Lopez: Closed, Anti-Marshall: 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.0-0 Be7 6.Re1 b5 7.Bb3 0-0 8.a4

• C89 Ruy Lopez, Marshall Counterattack
• Ruy Lopez: Marshall Attack: 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.0-0 Be7 6.Re1 b5 7.Bb3 0-0 8.c3 d5
• Ruy Lopez: Marshall Attack, Steiner Variation: 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.0-0 Be7 6.Re1 b5 7.Bb3 0-0 8.c3 d5 9.exd5 e4
• Ruy Lopez: Marshall Attack, Modern Variation: 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.0-0 Be7 6.Re1 b5 7.Bb3 0-0 8.c3 d5 9.exd5 Nxd5 10.Nxe5 Nxe5 11.Rxe5 c6
• Ruy Lopez: Marshall Attack, Re3 Variation: 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.0-0 Be7 6.Re1 b5 7.Bb3 0-0 8.c3 d5 9.exd5 Nxd5 10.Nxe5 Nxe5 11.Rxe5 c6 12.Bxd5 cxd5 13.d4 Bd6 14.Re3
• Ruy Lopez: Marshall Attack, Main Line: 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.0-0 Be7 6.Re1 b5 7.Bb3 0-0 8.c3 d5 9.exd5 Nxd5 10.Nxe5 Nxe5 11.Rxe5 c6 12.d4
• Ruy Lopez: Marshall Attack, Modern Main Line: 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.0-0 Be7 6.Re1 b5 7.Bb3 0-0 8.c3 d5 9.exd5 Nxd5 10.Nxe5 Nxe5 11.Rxe5 c6 12.d4 Bd6 13.Re1 Qh4 14.g3 Qh3
• Ruy Lopez: Marshall Attack, Main Line, Spassky Variation: 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.0-0 Be7 6.Re1 b5 7.Bb3 0-0 8.c3 d5 9.exd5 Nxd5 10.Nxe5 Nxe5 11.Rxe5 c6 12.d4 Bd6 13.Re1 Qh4 14.g3 Qh3 15.Be3 Bg4 16.Qd3 Rae8 17.Nd2 Re6 18.a4 Qh5
• Ruy Lopez: Marshall Attack, Original Marshall Attack: 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.0-0 Be7 6.Re1 b5 7.Bb3 0-0 8.c3 d5 9.exd5 Nxd5 10.Nxe5 Nxe5 11.Rxe5 Nf6

• C90 Ruy Lopez, Closed, 7...d6
• Ruy Lopez: Closed: 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.0-0 Be7 6.Re1 b5 7.Bb3 d6 8.c3 0-0
• Ruy Lopez: Closed, Suetin Variation: 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.0-0 Be7 6.Re1 b5 7.Bb3 d6 8.c3 0-0 9.a3
• Ruy Lopez: Closed, Lutikov Variation: 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.0-0 Be7 6.Re1 b5 7.Bb3 d6 8.c3 0-0 9.Bc2
• Ruy Lopez: Closed, Pilnik Variation: 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.0-0 Be7 6.Re1 b5 7.Bb3 0-0 8.d3 d6 9.c3

• C91 Ruy Lopez, Closed, 9.d4
• Ruy Lopez: Closed, Yates Variation: 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.0-0 Be7 6.Re1 b5 7.Bb3 d6 8.c3 0-0 9.d4
• Ruy Lopez: Closed, Bogoljubow Variation: 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.0-0 Be7 6.Re1 b5 7.Bb3 d6 8.c3 0-0 9.d4 Bg4
• Ruy Lopez: Closed, Yates Variation, Short Attack: 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.0-0 Be7 6.Re1 b5 7.Bb3 d6 8.c3 0-0 9.d4 Bg4 10.a4

• C92 Ruy Lopez, Closed, 9.h3
• Ruy Lopez: Closed: 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.0-0 Be7 6.Re1 b5 7.Bb3 d6 8.c3 0-0 9.h3
• Ruy Lopez: Closed, Flohr System: 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.0-0 Be7 6.Re1 b5 7.Bb3 d6 8.c3 0-0 9.h3 Bb7
• Ruy Lopez: Closed, Smyslov-Breyer-Zaitsev Hybrid: 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.0-0 Be7 6.Re1 b5 7.Bb3 d6 8.c3 0-0 9.h3 Bb7 10.d4 Re8 11.Nbd2 Bf8 12.a3 h6
• Ruy Lopez: Closed, Kholmov Variation: 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.0-0 Be7 6.Re1 b5 7.Bb3 d6 8.c3 0-0 9.h3 Be6
• Ruy Lopez: Closed, Karpov Variation: 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.0-0 Be7 6.Re1 b5 7.Bb3 d6 8.c3 0-0 9.h3 Nd7
• Ruy Lopez: Closed, Zaitsev System: 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.0-0 Be7 6.Re1 b5 7.Bb3 d6 8.c3 0-0 9.h3 Re8

• C93 Ruy Lopez, Closed, Smyslov Defence
• Ruy Lopez: Closed, Smyslov Defense: 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.0-0 Be7 6.Re1 b5 7.Bb3 d6 8.c3 0-0 9.h3 h6

• C94 Ruy Lopez, Closed, Breyer Defence, 10.d3
• Ruy Lopez: Closed, Breyer Defense: 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.0-0 Be7 6.Re1 b5 7.Bb3 d6 8.c3 0-0 9.h3 Nb8
• Ruy Lopez: Closed, Breyer Defense, Quiet Variation: 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.0-0 Be7 6.Re1 b5 7.Bb3 d6 8.c3 0-0 9.h3 Nb8 10.d3

• C95 Ruy Lopez, Closed, Breyer Defence, 10.d4
• Ruy Lopez: Closed, Breyer: 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.0-0 Be7 6.Re1 b5 7.Bb3 d6 8.c3 0-0 9.h3 Nb8 10.d4
• Ruy Lopez: Closed, Breyer Defense, Zaitsev Hybrid: 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.0-0 Be7 6.Re1 b5 7.Bb3 d6 8.c3 0-0 9.h3 Nb8 10.d4 Nbd7
• Ruy Lopez: Closed, Breyer Defense: 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.0-0 Be7 6.Re1 b5 7.Bb3 d6 8.c3 0-0 9.h3 Nb8 10.d4 Nbd7 11.Nbd2 Bb7 12.Bc2 c5
• Ruy Lopez: Closed, Breyer Defense: 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.0-0 Be7 6.Re1 b5 7.Bb3 d6 8.c3 0-0 9.h3 Nb8 10.d4 Nbd7 11.Nh4

• C96 Ruy Lopez, Closed, 8...Na5
• Ruy Lopez: Closed, Chigorin Defense: 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.0-0 Be7 6.Re1 b5 7.Bb3 d6 8.c3 0-0 9.h3 Na5 10.Bc2
• Ruy Lopez: Closed, Chigorin Defense: 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.0-0 Be7 6.Re1 b5 7.Bb3 d6 8.c3 0-0 9.h3 Na5 10.Bc2 c5
• Ruy Lopez: Closed, Borisenko Variation: 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.0-0 Be7 6.Re1 b5 7.Bb3 d6 8.c3 0-0 9.h3 Na5 10.Bc2 c5 11.d4 Nc6
• Ruy Lopez: Closed, Keres Defense: 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.0-0 Be7 6.Re1 b5 7.Bb3 d6 8.c3 0-0 9.h3 Na5 10.Bc2 c5 11.d4 Nd7
• Ruy Lopez: Closed, Rossolimo Defense: 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.0-0 Be7 6.Re1 b5 7.Bb3 d6 8.c3 0-0 9.h3 Na5 10.Bc2 c6 11.d4 Qc7
• Ruy Lopez: Closed, Chigorin Defense, Gajewski Gambit: 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.0-0 Be7 6.Re1 b5 7.Bb3 d6 8.c3 0-0 9.h3 Na5 10.Bc2 d5

• C97 Ruy Lopez, Closed, Chigorin Defence
• Ruy Lopez: Closed, Chigorin Defense: 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.0-0 Be7 6.Re1 b5 7.Bb3 d6 8.c3 0-0 9.h3 Na5
• Ruy Lopez: Closed, Chigorin Defense: 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.0-0 Be7 6.Re1 b5 7.Bb3 d6 8.c3 0-0 9.h3 Na5 10.Bc2 c5 11.d4 Qc7
• Ruy Lopez: Closed, Chigorin, Yugoslav System: 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.0-0 Be7 6.Re1 b5 7.Bb3 d6 8.c3 0-0 9.h3 Na5 10.Bc2 c5 11.d4 Qc7 12.Nbd2 Bd7 13.Nf1 Rfe8 14.Ne3 g6

• C98 Ruy Lopez, Closed, Chigorin, 12...Nc6
• Ruy Lopez: Closed, Chigorin Defense: 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.0-0 Be7 6.Re1 b5 7.Bb3 d6 8.c3 0-0 9.h3 Na5 10.Bc2 c5 11.d4 Qc7 12.Nbd2 Nc6
• Ruy Lopez: Closed, Chigorin Defense: 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.0-0 Be7 6.Re1 b5 7.Bb3 d6 8.c3 0-0 9.h3 Na5 10.Bc2 c5 11.d4 Qc7 12.Nbd2 Nc6 13.dxc5

• C99 Ruy Lopez, Closed, Chigorin, 12...cxd4
• Ruy Lopez: Closed, Chigorin Defense, Panov System: 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.0-0 Be7 6.Re1 b5 7.Bb3 d6 8.c3 0-0 9.h3 Na5 10.Bc2 c5 11.d4 Qc7 12.Nbd2 cxd4 13.cxd4

• 1.d4 d5: Closed Game (D00–D69)
• 1.d4 Nf6 2.c4 g6 with 3...d5: Grünfeld Defence (D70–D99)

1.d4 d5: Closed Game

• D00 Queen's Pawn Game (including Blackmar–Diemer Gambit, Halosar Trap and others)
• Queen's Pawn Game: 1.d4 d5
• Queen's Pawn Game: Accelerated London System: 1.d4 d5 2.Bf4
• Queen's Pawn Game: Accelerated London System, Steinitz Countergambit: 1.d4 d5 2.Bf4 c5
• Queen's Pawn Game: Accelerated London System, Steinitz Countergambit Accepted: 1.d4 d5 2.Bf4 c5 3.dxc5
• Queen's Pawn Game: Accelerated London System, Steinitz Countergambit, Morris Countergambit: 1.d4 d5 2.Bf4 c5 3.e4
• Queen's Pawn Game: Accelerated London System, Steinitz Countergambit, Morris Countergambit Accepted: 1.d4 d5 2.Bf4 c5 3.e4 dxe4
• Queen's Pawn Game: Levitsky Attack: 1.d4 d5 2.Bg5
• Queen's Pawn Game: Levitsky Attack, Welling Variation: 1.d4 d5 2.Bg5 Bg4
• Queen's Pawn Game: 1.d4 d5 2.e3
• Queen's Pawn Game: 1.d4 d5 2.e3 Nf6
• Queen's Pawn Game: Stonewall Attack: 1.d4 d5 2.e3 Nf6 3.Bd3
• Blackmar-Diemer Gambit: 1.d4 d5 2.e4
• Blackmar-Diemer Gambit: Fritz Attack: 1.d4 d5 2.e4 dxe4 3.Bc4
• Blackmar-Diemer Gambit: Diemer-Rosenberg Attack: 1.d4 d5 2.e4 dxe4 3.Be3
• Blackmar-Diemer Gambit: Blackmar Gambit: 1.d4 d5 2.e4 dxe4 3.f3
• Blackmar-Diemer Gambit: Zeller Defense: 1.d4 d5 2.e4 dxe4 3.Nc3 Bf5
• Blackmar-Diemer Gambit: Zeller Defense, Soller Attack: 1.d4 d5 2.e4 dxe4 3.Nc3 Bf5 4.f3 Nf6 5.Bc4
• Blackmar-Diemer Gambit: Reversed Albin Countergambit: 1.d4 d5 2.e4 dxe4 3.Nc3 c5
• Blackmar-Diemer Gambit: Lemberger Countergambit: 1.d4 d5 2.e4 dxe4 3.Nc3 e5
• Blackmar-Diemer Gambit: Lemberger Countergambit, Soller Attack: 1.d4 d5 2.e4 dxe4 3.Nc3 e5 4.Be3
• Blackmar-Diemer Gambit: Lemberger Countergambit, Endgame Variation: 1.d4 d5 2.e4 dxe4 3.Nc3 e5 4.dxe5
• Blackmar-Diemer Gambit: Lemberger Countergambit, Rasmussen Attack: 1.d4 d5 2.e4 dxe4 3.Nc3 e5 4.Nge2
• Blackmar-Diemer Gambit: Lemberger Countergambit, Lange Gambit: 1.d4 d5 2.e4 dxe4 3.Nc3 e5 4.Nxe4
• Blackmar-Diemer Gambit: Lemberger Countergambit, Sneiders Attack: 1.d4 d5 2.e4 dxe4 3.Nc3 e5 4.Qh5
• Blackmar-Diemer Gambit: Netherlands Variation: 1.d4 d5 2.e4 dxe4 3.Nc3 f5
• Blackmar-Diemer Gambit: 1.d4 d5 2.e4 dxe4 3.Nc3 Nf6
• Blackmar-Diemer Gambit: Rasa-Studier Gambit: 1.d4 d5 2.e4 dxe4 3.Nc3 Nf6 4.Be3
• Blackmar-Diemer Gambit: von Popiel Gambit: 1.d4 d5 2.e4 dxe4 3.Nc3 Nf6 4.Bg5
• Blackmar-Diemer Gambit: von Popiel Gambit, Zilbermints Variation: 1.d4 d5 2.e4 dxe4 3.Nc3 Nf6 4.Bg5 Bf5 5.Bxf6 exf6 6.g4 Bg6 7.Qe2 Bb4 8.Qb5+
• Blackmar-Diemer Gambit Declined: Gedult Defense: 1.d4 d5 2.e4 dxe4 3.Nc3 Nf6 4.f3 a6
• Blackmar-Diemer Gambit Declined: Vienna Defense: 1.d4 d5 2.e4 dxe4 3.Nc3 Nf6 4.f3 Bf5
• Blackmar-Diemer Gambit Declined: Brombacher Countergambit: 1.d4 d5 2.e4 dxe4 3.Nc3 Nf6 4.f3 c5
• Blackmar-Diemer Gambit Declined: O'Kelly Defense: 1.d4 d5 2.e4 dxe4 3.Nc3 Nf6 4.f3 c6
• Blackmar-Diemer Gambit Declined: Langeheinicke Defense: 1.d4 d5 2.e4 dxe4 3.Nc3 Nf6 4.f3 e3
• Blackmar-Diemer Gambit Declined: Elbert Countergambit: 1.d4 d5 2.e4 dxe4 3.Nc3 Nf6 4.f3 e5
• Blackmar-Diemer Gambit Declined: Weinsbach Defense: 1.d4 d5 2.e4 dxe4 3.Nc3 Nf6 4.f3 e6
• Blackmar-Diemer Gambit Accepted: 1.d4 d5 2.e4 dxe4 3.Nc3 Nf6 4.f3 exf3
• Blackmar-Diemer Gambit Accepted: Ritter Defense: 1.d4 d5 2.e4 dxe4 3.Nc3 Nf6 4.f3 exf3 5.Nxf3 b6
• Blackmar-Diemer Gambit Accepted: Gunderam Defense: 1.d4 d5 2.e4 dxe4 3.Nc3 Nf6 4.f3 exf3 5.Nxf3 Bf5
• Blackmar-Diemer Gambit Accepted: Gunderam Defense, Stader Variation: 1.d4 d5 2.e4 dxe4 3.Nc3 Nf6 4.f3 exf3 5.Nxf3 Bf5 6.Ne5 e6 7.g4 Be4
• Blackmar-Diemer Gambit Accepted: Teichmann Defense: 1.d4 d5 2.e4 dxe4 3.Nc3 Nf6 4.f3 exf3 5.Nxf3 Bg4
• Blackmar-Diemer Gambit Accepted: Teichmann Defense, Classical Variation: 1.d4 d5 2.e4 dxe4 3.Nc3 Nf6 4.f3 exf3 5.Nxf3 Bg4 6.h3 Bxf3 7.Qxf3 c6 8.Be3
• Blackmar-Diemer Gambit Accepted: Teichmann Defense, Seidel-Hall Attack: 1.d4 d5 2.e4 dxe4 3.Nc3 Nf6 4.f3 exf3 5.Nxf3 Bg4 6.h3 Bxf3 7.Qxf3 c6 8.g4
• Blackmar-Diemer Gambit Accepted: Teichmann Defense, Ciesielski Variation: 1.d4 d5 2.e4 dxe4 3.Nc3 Nf6 4.f3 exf3 5.Nxf3 Bg4 6.h3 Bxf3 7.Qxf3 c6 8.Qf2
• Blackmar-Diemer Gambit Accepted: Kaulich Defense: 1.d4 d5 2.e4 dxe4 3.Nc3 Nf6 4.f3 exf3 5.Nxf3 c5
• Blackmar-Diemer Gambit Accepted: Ziegler Defense: 1.d4 d5 2.e4 dxe4 3.Nc3 Nf6 4.f3 exf3 5.Nxf3 c6
• Blackmar-Diemer Gambit Accepted: Euwe Defense: 1.d4 d5 2.e4 dxe4 3.Nc3 Nf6 4.f3 exf3 5.Nxf3 e6
• Blackmar-Diemer Gambit Accepted: Euwe Defense, Zilbermints Gambit: 1.d4 d5 2.e4 dxe4 3.Nc3 Nf6 4.f3 exf3 5.Nxf3 e6 6.Bg5 Be7 7.Bd3 Nc6 8.0-0 Nxd4 9.Kh1
• Blackmar-Diemer Gambit Accepted: Bogoljubow Defense: 1.d4 d5 2.e4 dxe4 3.Nc3 Nf6 4.f3 exf3 5.Nxf3 g6
• Blackmar-Diemer Gambit Accepted: Bogoljubow Defense, Mad Dog Attack: 1.d4 d5 2.e4 dxe4 3.Nc3 Nf6 4.f3 exf3 5.Nxf3 g6 6.Bc4 Bg7 7.h4
• Blackmar-Diemer Gambit Accepted: Bogoljubow Defense, Nimzowitsch Attack: 1.d4 d5 2.e4 dxe4 3.Nc3 Nf6 4.f3 exf3 5.Nxf3 g6 6.Bc4 Bg7 7.Ne5
• Blackmar-Diemer Gambit Accepted: Bogoljubow Defense, Kloss Attack: 1.d4 d5 2.e4 dxe4 3.Nc3 Nf6 4.f3 exf3 5.Nxf3 g6 6.Bc4 Bg7 7.0-0 0-0 8.Kh1
• Blackmar-Diemer Gambit Accepted: Bogoljubow Defense, Studier Attack: 1.d4 d5 2.e4 dxe4 3.Nc3 Nf6 4.f3 exf3 5.Nxf3 g6 6.Bc4 Bg7 7.0-0 0-0 8.Qe1
• Blackmar-Diemer Gambit Accepted: Schlutter Defense: 1.d4 d5 2.e4 dxe4 3.Nc3 Nf6 4.f3 exf3 5.Nxf3 Nbd7
• Blackmar-Diemer Gambit Accepted: Pietrowsky Defense: 1.d4 d5 2.e4 dxe4 3.Nc3 Nf6 4.f3 exf3 5.Nxf3 Nc6
• Blackmar-Diemer Gambit Accepted: Holwell Defense: 1.d4 d5 2.e4 dxe4 3.Nc3 Nf6 4.f3 exf3 5.Nxf3 Qd6
• Blackmar-Diemer Gambit Accepted: Ryder Gambit: 1.d4 d5 2.e4 dxe4 3.Nc3 Nf6 4.f3 exf3 5.Qxf3
• Blackmar-Diemer Gambit Declined: Lamb Defense: 1.d4 d5 2.e4 dxe4 3.Nc3 Nf6 4.f3 Nc6
• Queen's Pawn Game: Mason Attack: 1.d4 d5 2.f4
• Queen's Pawn Game: Zurich Gambit: 1.d4 d5 2.g4
• Queen's Pawn Game: Chigorin Variation: 1.d4 d5 2.Nc3
• Queen's Pawn Game: Chigorin Variation, Alburt Defense: 1.d4 d5 2.Nc3 Bf5
• Queen's Pawn Game: Chigorin Variation, Anti-Veresov: 1.d4 d5 2.Nc3 Bg4
• Queen's Pawn Game: Chigorin Variation, Irish Gambit: 1.d4 d5 2.Nc3 c5
• Queen's Pawn Game: Chigorin Variation, Shaviliuk Gambit: 1.d4 d5 2.Nc3 e5
• Queen's Pawn Game: Chigorin Variation: 1.d4 d5 2.Nc3 e6
• Queen's Pawn Game: Chigorin Variation, Shropshire Defense: 1.d4 d5 2.Nc3 h5
• Amazon Attack: 1.d4 d5 2.Qd3
• Queen's Pawn Game: Chigorin Variation, Fianchetto Defense: 1.d4 g6 2.Nf3 Bg7 3.Nc3 d5
• Queen's Pawn Game: Hübsch Gambit: 1.d4 Nf6 2.Nc3 d5 3.e4

• D01 Richter–Veresov Attack
• Rapport-Jobava System, with e6: 1.d4 d5 2.Nc3 e6 3.Bf4
• Rapport-Jobava System: 1.d4 d5 2.Nc3 Nf6 3.Bf4
• Rapport-Jobava System: 1.d4 d5 2.Nc3 Nf6 3.Bf4 e6
• Rapport-Jobava System: 1.d4 d5 2.Nc3 Nf6 3.Bf4 g6
• Richter-Veresov Attack: 1.d4 Nf6 2.Nc3 d5 3.Bg5
• Richter-Veresov Attack: 1.d4 Nf6 2.Nc3 d5 3.Bg5 Bf5
• Richter-Veresov Attack: Veresov Variation: 1.d4 Nf6 2.Nc3 d5 3.Bg5 Bf5 4.Bxf6
• Richter-Veresov Attack: Richter Variation: 1.d4 Nf6 2.Nc3 d5 3.Bg5 Bf5 4.f3
• Richter-Veresov Attack: Malich Gambit: 1.d4 Nf6 2.Nc3 d5 3.Bg5 c5 4.Bxf6 gxf6 5.e4 dxe4 6.d5
• Richter-Veresov Attack: Two Knights System: 1.d4 Nf6 2.Nc3 d5 3.Bg5 Nbd7 4.Nf3
• Richter-Veresov Attack: Two Knights System, Grünfeld Defense: 1.d4 Nf6 2.Nc3 d5 3.Bg5 Nbd7 4.Nf3 g6
• Richter-Veresov Attack: Boyce Defense: 1.d4 Nf6 2.Nc3 d5 3.Bg5 Ne4

• D02 Queen's Pawn Game, 2.Nf3 (including the London System)
• Queen's Pawn Game: Zukertort Variation: 1.d4 d5 2.Nf3
• Queen's Gambit Declined: Baltic Defense, Pseudo-Slav: 1.d4 d5 2.Nf3 Bf5 3.c4 e6 4.Nc3 c6
• Queen's Pawn Game: Krause Variation: 1.d4 d5 2.Nf3 c5
• Queen's Pawn Game: Chandler Gambit: 1.d4 d5 2.Nf3 c5 3.g3 cxd4 4.Bg2
• Queen's Pawn Game: Levitsky Attack, Euwe Variation, Modern Line: 1.d4 d5 2.Nf3 c6 3.Bg5 h6 4.Bh4 Qb6
• Queen's Pawn Game: London System, with e6: 1.d4 d5 2.Nf3 e6 3.Bf4
• Queen's Pawn Game: Chigorin Variation: 1.d4 d5 2.Nf3 Nc6
• Queen's Pawn Game: Symmetrical Variation: 1.d4 d5 2.Nf3 Nf6
• Queen's Pawn Game: London System: 1.d4 d5 2.Nf3 Nf6 3.Bf4
• Queen's Pawn Game: Zilbermints Countergambit: 1.d4 d5 2.Nf3 Nf6 3.c4 b5
• Queen's Pawn Game: Symmetrical Variation, Pseudo-Catalan: 1.d4 d5 2.Nf3 Nf6 3.g3
• Queen's Pawn Game: London System, Pterodactyl Variation: 1.d4 g6 2.Nf3 Bg7 3.Bf4 c5 4.c3 cxd4 5.cxd4 Qa5+
• London System: Poisoned Pawn Variation: 1.d4 Nf6 2.Nf3 d5 3.Bf4 c5 4.e3 Qb6 5.Nc3
• Queen's Pawn Game: Anti-Torre: 1.Nf3 d5 2.d4 Bg4

• D03 Torre Attack, Tartakower Variation
• Queen's Pawn Game: Torre Attack: 1.d4 d5 2.Nf3 Nf6 3.Bg5
• Queen's Pawn Game: Torre Attack, Grünfeld Variation: 1.d4 d5 2.Nf3 Nf6 3.Bg5 g6
• Queen's Pawn Game: Torre Attack, Gossip Variation: 1.d4 d5 2.Nf3 Nf6 3.Bg5 Ne4

• D04 Queen's Pawn Game, Colle System
• Queen's Pawn Game: Colle System: 1.d4 d5 2.Nf3 Nf6 3.e3
• Queen's Pawn Game: Colle System, Anti-Colle: 1.d4 d5 2.Nf3 Nf6 3.e3 Bf5
• Queen's Pawn Game: Colle System, Grünfeld Formation: 1.d4 d5 2.Nf3 Nf6 3.e3 g6 4.Bd3 Bg7

• D05 Queen's Pawn Game, Zukertort Variation (including Colle System)
• Queen's Pawn Game: Zukertort Variation: 1.d4 d5 2.Nf3 c5 3.e3 Nf6 4.Nbd2 e6 5.b3
• Queen's Pawn Game: Colle System: 1.d4 d5 2.Nf3 Nf6 3.e3 e6
• Queen's Pawn Game: Colle System: 1.d4 d5 2.Nf3 Nf6 3.e3 e6 4.Bd3
• Rubinstein Opening: Semi-Slav Defense: 1.d4 d5 2.Nf3 Nf6 3.e3 e6 4.Bd3 Bd6 5.0-0 0-0 6.b3 Nbd7 7.Bb2
• Rubinstein Opening: 1.d4 Nf6 2.Nf3 e6 3.e3 c5 4.Bd3 d5 5.b3
• Rubinstein Opening: Bogoljubow Defense: 1.d4 Nf6 2.Nf3 e6 3.e3 c5 4.Bd3 d5 5.b3 Nc6 6.0-0 Bd6 7.Bb2 0-0
• Rubinstein Opening: Classical Defense: 1.d4 Nf6 2.Nf3 e6 3.e3 c5 4.Bd3 d5 5.b3 Nc6 6.0-0 Be7 7.Bb2 0-0
• Queen's Pawn Game: Colle System, Traditional Colle: 1.d4 Nf6 2.Nf3 e6 3.e3 c5 4.Bd3 d5 5.c3

• D06 Queen's Gambit (including the Baltic Defence, Marshall Defence and Symmetrical Defence)
• Queen's Gambit: 1.d4 d5 2.c4
• Queen's Gambit Declined: Zilbermints Gambit: 1.d4 d5 2.c4 b5
• Queen's Gambit Declined: Baltic Defense: 1.d4 d5 2.c4 Bf5
• Queen's Gambit Declined: Baltic Defense, Argentinian Gambit: 1.d4 d5 2.c4 Bf5 3.cxd5 Bxb1 4.Qa4+ c6 5.dxc6 Nxc6
• Queen's Gambit Declined: Baltic Defense, Pseudo-Chigorin: 1.d4 d5 2.c4 Bf5 3.Nc3 e6 4.Nf3 Nc6
• Queen's Gambit Declined: Baltic Defense, Queen Attack Deferred: 1.d4 d5 2.c4 Bf5 3.Nc3 e6 4.Qb3
• Queen's Gambit Declined: Baltic Defense, Queen Attack: 1.d4 d5 2.c4 Bf5 3.Qb3
• Queen's Gambit Declined: Austrian Defense: 1.d4 d5 2.c4 c5
• Queen's Gambit Declined: Austrian Defense, Gusev Countergambit: 1.d4 d5 2.c4 c5 3.cxd5 Nf6
• Queen's Gambit Declined: Austrian Defense, Haberditz Variation: 1.d4 d5 2.c4 c5 3.cxd5 Nf6 4.e4 Nxe4 5.dxc5 Qa5+
• Queen's Gambit Declined: Austrian Attack, Salvio Countergambit: 1.d4 d5 2.c4 c5 3.dxc5 d4
• Queen's Gambit Declined: Marshall Defense: 1.d4 d5 2.c4 Nf6
• Queen's Gambit Declined: Marshall Defense, Tan Gambit: 1.d4 d5 2.c4 Nf6 3.cxd5 c6

• D07 QGD, Chigorin Defence
• Queen's Gambit Declined: Chigorin Defense: 1.d4 d5 2.c4 Nc6
• Queen's Gambit Declined: Chigorin Defense, Exchange Variation: 1.d4 d5 2.c4 Nc6 3.cxd5 Qxd5
• Queen's Gambit Declined: Chigorin Defense, Exchange Variation, Costa's Line: 1.d4 d5 2.c4 Nc6 3.cxd5 Qxd5 4.e3 e5 5.Nc3 Bb4 6.Bd2 Bxc3 7.Bxc3 exd4 8.Ne2
• Queen's Gambit Declined: Chigorin Defense: 1.d4 d5 2.c4 Nc6 3.Nc3
• Queen's Gambit Declined: Chigorin Defense: 1.d4 d5 2.c4 Nc6 3.Nc3 dxc4
• Queen's Gambit Declined: Chigorin Defense, Janowski Variation: 1.d4 d5 2.c4 Nc6 3.Nc3 dxc4 4.Nf3
• Queen's Gambit Declined: Chigorin Defense, Modern Gambit: 1.d4 d5 2.c4 Nc6 3.Nc3 dxc4 4.Nf3 Nf6
• Queen's Gambit Declined: Chigorin Defense, Tartakower Gambit: 1.d4 d5 2.c4 Nc6 3.Nc3 e5
• Queen's Gambit Declined: Chigorin Defense, Main Line: 1.d4 d5 2.c4 Nc6 3.Nf3 Bg4
• Queen's Gambit Declined: Chigorin Defense, Main Line, Alekhine Variation: 1.d4 d5 2.c4 Nc6 3.Nf3 Bg4 4.Qa4
• Queen's Gambit Declined: Chigorin Defense, Lazard Gambit: 1.d4 d5 2.c4 Nc6 3.Nf3 e5

• D08 QGD, Albin Countergambit and Lasker Trap
• Queen's Gambit Declined: Albin Countergambit: 1.d4 d5 2.c4 e5
• Queen's Gambit Declined: Albin Countergambit, Lasker Trap: 1.d4 d5 2.c4 e5 3.dxe5 d4 4.e3 Bb4+ 5.Bd2 dxe3
• Queen's Gambit Declined: Albin Countergambit, Normal Line: 1.d4 d5 2.c4 e5 3.dxe5 d4 4.Nf3
• Queen's Gambit Declined: Albin Countergambit, Tartakower Defense: 1.d4 d5 2.c4 e5 3.dxe5 d4 4.Nf3 c5
• Queen's Gambit Declined: Albin Countergambit, Modern Line: 1.d4 d5 2.c4 e5 3.dxe5 d4 4.Nf3 Nc6 5.Nbd2
• Queen's Gambit Declined: Albin Countergambit, Krenosz Variation: 1.d4 d5 2.c4 e5 3.dxe5 d4 4.Nf3 Nc6 5.Nbd2 Bg4 6.h3 Bxf3 7.Nxf3 Bb4+ 8.Bd2 Qe7
• Queen's Gambit Declined: Albin Countergambit, Janowski Variation: 1.d4 d5 2.c4 e5 3.dxe5 d4 4.Nf3 Nc6 5.Nbd2 f6
• Queen's Gambit Declined: Albin Countergambit, Balogh Variation: 1.d4 d5 2.c4 e5 3.dxe5 d4 4.Nf3 Nc6 5.Nbd2 Qe7

• D09 QGD, Albin Countergambit, 5.g3
• Queen's Gambit Declined: Albin Countergambit, Fianchetto Variation: 1.d4 d5 2.c4 e5 3.dxe5 d4 4.Nf3 Nc6 5.g3
• Queen's Gambit Declined: Albin Countergambit, Fianchetto Variation, Be6 Line: 1.d4 d5 2.c4 e5 3.dxe5 d4 4.Nf3 Nc6 5.g3 Be6
• Queen's Gambit Declined: Albin Countergambit, Fianchetto Variation, Bf5 Line: 1.d4 d5 2.c4 e5 3.dxe5 d4 4.Nf3 Nc6 5.g3 Bf5
• Queen's Gambit Declined: Albin Countergambit, Fianchetto Variation, Bg4 Line: 1.d4 d5 2.c4 e5 3.dxe5 d4 4.Nf3 Nc6 5.g3 Bg4

• D10 QGD, Slav Defence
• Slav Defense: 1.d4 d5 2.c4 c6
• Slav Defense: Exchange Variation: 1.d4 d5 2.c4 c6 3.cxd5
• Slav Defense: Exchange Variation, Boor Attack: 1.d4 d5 2.c4 c6 3.cxd5 cxd5 4.Nc3 Nf6 5.f3
• Slav Defense: Diemer Gambit: 1.d4 d5 2.c4 c6 3.e4
• Slav Defense: 1.d4 d5 2.c4 c6 3.Nc3
• Slav Defense: 1.d4 d5 2.c4 c6 3.Nc3 dxc4
• Slav Defense: Slav Gambit, Alekhine Attack: 1.d4 d5 2.c4 c6 3.Nc3 dxc4 4.e4
• Slav Defense: Winawer Countergambit: 1.d4 d5 2.c4 c6 3.Nc3 e5
• Slav Defense: Winawer Countergambit, Anti-Winawer Gambit: 1.d4 d5 2.c4 c6 3.Nc3 e5 4.e4

• D11 QGD, Slav Defence, 3.Nf3
• Slav Defense: Modern Line: 1.d4 d5 2.c4 c6 3.Nf3
• Slav Defense: Bonet Gambit: 1.d4 d5 2.c4 c6 3.Nf3 Nf6 4.Bg5
• Slav Defense: Quiet Variation: 1.d4 d5 2.c4 c6 3.Nf3 Nf6 4.e3
• Slav Defense: Quiet Variation, Pin Defense: 1.d4 d5 2.c4 c6 3.Nf3 Nf6 4.e3 Bg4
• Slav Defense: Breyer Variation: 1.d4 d5 2.c4 c6 3.Nf3 Nf6 4.Nbd2

• D12 QGD, Slav Defence, 4.e3 Bf5
• Slav Defense: Quiet Variation, Schallopp Defense: 1.d4 d5 2.c4 c6 3.Nf3 Nf6 4.e3 Bf5
• Slav Defense: Quiet Variation, Amsterdam Variation: 1.d4 d5 2.c4 c6 3.Nf3 Nf6 4.e3 Bf5 5.cxd5 cxd5 6.Nc3 e6 7.Ne5 Nfd7
• Slav Defense: Quiet Variation, Landau Variation: 1.d4 d5 2.c4 c6 3.Nf3 Nf6 4.e3 Bf5 5.cxd5 cxd5 6.Qb3 Qc8 7.Bd2 e6 8.Na3

• D13 QGD, Slav Defence, Exchange Variation
• Slav Defense: Exchange Variation: 1.d4 d5 2.c4 c6 3.Nf3 Nf6 4.cxd5 cxd5
• Slav Defense: Exchange Variation, Schallopp Variation: 1.d4 d5 2.c4 c6 3.Nf3 Nf6 4.e3 Bf5 5.cxd5 cxd5 6.Nc3

• D14 QGD, Slav Defence, Exchange Variation
• Slav Defense: Exchange Variation, Symmetrical Line: 1.d4 d5 2.c4 c6 3.cxd5 cxd5 4.Nc3 Nf6 5.Nf3 Nc6 6.Bf4 Bf5
• Slav Defense: Exchange Variation, Trifunovic Variation: 1.d4 d5 2.c4 c6 3.Nf3 Nf6 4.cxd5 cxd5 5.Nc3 Nc6 6.Bf4 Bf5 7.e3 e6 8.Qb3 Bb4

• D15 QGD, Slav, 4.Nc3
• Slav Defense: Three Knights Variation: 1.d4 d5 2.c4 c6 3.Nf3 Nf6 4.Nc3
• Slav Defense: Chebanenko Variation: 1.d4 d5 2.c4 c6 3.Nf3 Nf6 4.Nc3 a6
• Slav Defense: Chebanenko Variation, Advance System: 1.d4 d5 2.c4 c6 3.Nf3 Nf6 4.Nc3 a6 5.c5
• Slav Defense: Two Knights Attack: 1.d4 d5 2.c4 c6 3.Nf3 Nf6 4.Nc3 dxc4
• Slav Defense: Alekhine Variation: 1.d4 d5 2.c4 c6 3.Nf3 Nf6 4.Nc3 dxc4 5.e3
• Slav Defense: Geller Gambit: 1.d4 d5 2.c4 c6 3.Nf3 Nf6 4.Nc3 dxc4 5.e4
• Slav Defense: Geller Gambit: 1.d4 d5 2.c4 c6 3.Nf3 Nf6 4.Nc3 dxc4 5.e4 b5 6.e5
• Slav Defense: Schlechter Variation: 1.d4 d5 2.c4 c6 3.Nf3 Nf6 4.Nc3 g6
• Slav Defense: Süchting Variation: 1.d4 d5 2.c4 c6 3.Nf3 Nf6 4.Nc3 Qb6

• D16 QGD, Slav Accepted, Alapin Variation
• Slav Defense: Alapin Variation: 1.d4 d5 2.c4 c6 3.Nf3 Nf6 4.Nc3 dxc4 5.a4
• Slav Defense: Steiner Variation: 1.d4 d5 2.c4 c6 3.Nf3 Nf6 4.Nc3 dxc4 5.a4 Bg4
• Slav Defense: Soultanbeieff Variation: 1.d4 d5 2.c4 c6 3.Nf3 Nf6 4.Nc3 dxc4 5.a4 e6
• Slav Defense: Smyslov Variation: 1.d4 d5 2.c4 c6 3.Nf3 Nf6 4.Nc3 dxc4 5.a4 Na6

• D17 QGD, Slav Defence, Czech Defence
• Slav Defense: Czech Variation: 1.d4 d5 2.c4 c6 3.Nf3 Nf6 4.Nc3 dxc4 5.a4 Bf5
• Slav Defense: Czech Variation, Krause Attack: 1.d4 d5 2.c4 c6 3.Nf3 Nf6 4.Nc3 dxc4 5.a4 Bf5 6.Ne5
• Slav Defense: Czech Variation, Wiesbaden Variation: 1.d4 d5 2.c4 c6 3.Nf3 Nf6 4.Nc3 dxc4 5.a4 Bf5 6.Ne5 e6
• Slav Defense: Czech Variation, Wiesbaden Variation, Sharp Line: 1.d4 d5 2.c4 c6 3.Nf3 Nf6 4.Nc3 dxc4 5.a4 Bf5 6.Ne5 e6 7.f3 Bb4 8.e4
• Slav Defense: Czech Variation, Krause Attack, Fazekas Gambit: 1.d4 d5 2.c4 c6 3.Nf3 Nf6 4.Nc3 dxc4 5.a4 Bf5 6.Ne5 Na6 7.e4
• Slav Defense: Czech Variation, Carlsbad Variation: 1.d4 d5 2.c4 c6 3.Nf3 Nf6 4.Nc3 dxc4 5.a4 Bf5 6.Ne5 Nbd7 7.Nxc4 Qc7 8.g3 e5
• Slav Defense: Czech Variation, Carlsbad Variation, Morozevich Variation: 1.d4 d5 2.c4 c6 3.Nf3 Nf6 4.Nc3 dxc4 5.a4 Bf5 6.Ne5 Nbd7 7.Nxc4 Qc7 8.g3 e5 9.dxe5 Nxe5 10.Bf4 Nfd7 11.Bg2 g5
• Slav Defense: Czech Variation, Bled Attack: 1.d4 d5 2.c4 c6 3.Nf3 Nf6 4.Nc3 dxc4 5.a4 Bf5 6.Nh4

• D18 QGD, Dutch Variation
• Slav Defense: Czech Variation, Classical System: 1.d4 d5 2.c4 c6 3.Nf3 Nf6 4.Nc3 dxc4 5.a4 Bf5 6.e3
• Slav Defense: Czech Variation, Lasker Variation: 1.d4 d5 2.c4 c6 3.Nf3 Nf6 4.Nc3 dxc4 5.a4 Bf5 6.e3 Na6

• D19 QGD, Dutch Variation
• Slav Defense: Czech Variation, Dutch Variation: 1.d4 d5 2.c4 c6 3.Nf3 Nf6 4.Nc3 dxc4 5.a4 Bf5 6.e3 e6 7.Bxc4 Bb4 8.0-0
• Slav Defense: Czech Variation, Classical System, Main Line: 1.d4 d5 2.c4 c6 3.Nf3 Nf6 4.Nc3 dxc4 5.a4 Bf5 6.e3 e6 7.Bxc4 Bb4 8.0-0 0-0 9.Qe2
• Slav Defense: Czech Variation, Dutch Variation, Sämisch Variation: 1.d4 d5 2.c4 c6 3.Nf3 Nf6 4.Nc3 dxc4 5.a4 Bf5 6.e3 e6 7.Bxc4 Bb4 8.0-0 0-0 9.Qe2 Ne4 10.g4

• D20 Queen's Gambit Accepted without 3.Nf3 (Central Variation, Old Variation, and atypical moves by White)
• Queen's Gambit Accepted: 1.d4 d5 2.c4 dxc4
• Queen's Gambit Accepted: Old Variation: 1.d4 d5 2.c4 dxc4 3.e3
• Queen's Gambit Accepted: Old Variation, Billinger Gambit: 1.d4 d5 2.c4 dxc4 3.e3 e5 4.Bxc4 exd4 5.Qb3 Qe7 6.a3
• Queen's Gambit Accepted: Old Variation, Korchnoi Gambit: 1.d4 d5 2.c4 dxc4 3.e3 e5 4.Bxc4 exd4 5.Qb3 Qe7 6.Kf1
• Queen's Gambit Accepted: Old Variation, Novikov Gambit: 1.d4 d5 2.c4 dxc4 3.e3 e5 4.Bxc4 exd4 5.Qb3 Qe7 6.Nd2
• Queen's Gambit Accepted: Old Variation, Christensen Gambit: 1.d4 d5 2.c4 dxc4 3.e3 e5 4.Bxc4 exd4 5.Qb3 Qe7 6.Nf3
• Queen's Gambit Accepted: Saduleto Variation: 1.d4 d5 2.c4 dxc4 3.e4
• Queen's Gambit Accepted: Central Variation, Greco Variation: 1.d4 d5 2.c4 dxc4 3.e4 b5
• Queen's Gambit Accepted: Central Variation, Rubinstein Defense: 1.d4 d5 2.c4 dxc4 3.e4 c5
• Queen's Gambit Accepted: Central Variation, Rubinstein Defense, Yefimov Gambit: 1.d4 d5 2.c4 dxc4 3.e4 c5 4.d5 b5
• Queen's Gambit Accepted: Linares Variation: 1.d4 d5 2.c4 dxc4 3.e4 c5 4.d5 Nf6 5.Nc3 b5
• Queen's Gambit Accepted: Central Variation, McDonnell Defense: 1.d4 d5 2.c4 dxc4 3.e4 e5
• Queen's Gambit Accepted: Central Variation, McDonnell Defense, Somov Gambit: 1.d4 d5 2.c4 dxc4 3.e4 e5 4.Bxc4
• Queen's Gambit Accepted: Schwartz Defense: 1.d4 d5 2.c4 dxc4 3.e4 f5
• Queen's Gambit Accepted: Central Variation, Modern Defense: 1.d4 d5 2.c4 dxc4 3.e4 Nc6
• Queen's Gambit Accepted: Central Variation, Alekhine System: 1.d4 d5 2.c4 dxc4 3.e4 Nf6
• Queen's Gambit Accepted: Accelerated Mannheim Variation: 1.d4 d5 2.c4 dxc4 3.Qa4+

• D21 QGA, 3.Nf3
• Queen's Gambit Accepted: Normal Variation: 1.d4 d5 2.c4 dxc4 3.Nf3
• Queen's Gambit Accepted: Alekhine Defense, Borisenko-Furman Variation: 1.d4 d5 2.c4 dxc4 3.Nf3 a6 4.e4
• Queen's Gambit Accepted: Slav Gambit: 1.d4 d5 2.c4 dxc4 3.Nf3 b5
• Queen's Gambit Accepted: Gunsberg Defense: 1.d4 d5 2.c4 dxc4 3.Nf3 c5
• Queen's Gambit Accepted: Rosenthal Variation: 1.d4 d5 2.c4 dxc4 3.Nf3 e6
• Queen's Gambit Accepted: Godes Variation: 1.d4 d5 2.c4 dxc4 3.Nf3 Nd7

• D22 QGA, Alekhine Defence (3...a6)
• Queen's Gambit Accepted: Alekhine Defense: 1.d4 d5 2.c4 dxc4 3.Nf3 a6
• Queen's Gambit Accepted: Alekhine Defense, Haberditz Variation: 1.d4 d5 2.c4 dxc4 3.Nf3 a6 4.e3 b5
• Queen's Gambit Accepted: Alekhine Defense, Alatortsev Variation: 1.d4 d5 2.c4 dxc4 3.Nf3 a6 4.e3 Bg4 5.Bxc4 e6 6.d5

• D23 Queen's Gambit Accepted (3...Nf6)
• Queen's Gambit Accepted: 1.d4 d5 2.c4 dxc4 3.Nf3 Nf6
• Queen's Gambit Accepted: Mannheim Variation: 1.d4 d5 2.c4 dxc4 3.Nf3 Nf6 4.Qa4+

• D24 QGA, 4.Nc3
• Queen's Gambit Accepted: Showalter Variation: 1.d4 d5 2.c4 dxc4 3.Nf3 Nf6 4.Nc3
• Queen's Gambit Accepted: Bogoljubow Defense: 1.d4 d5 2.c4 dxc4 3.Nf3 Nf6 4.Nc3 a6 5.e4
• Queen's Gambit Accepted: Gunsberg Defense, Prianishenmo Gambit: 1.d4 d5 2.c4 dxc4 3.Nf3 Nf6 4.Nc3 c5 5.d5 e6 6.e4 exd5 7.e5

• D25 QGA, 4.e3
• Queen's Gambit Accepted: Normal Variation: 1.d4 d5 2.c4 dxc4 3.Nf3 Nf6 4.e3
• Queen's Gambit Accepted: Winawer Defense: 1.d4 d5 2.c4 dxc4 3.Nf3 Nf6 4.e3 Be6
• Queen's Gambit Accepted: Janowski-Larsen Variation: 1.d4 d5 2.c4 dxc4 3.Nf3 Nf6 4.e3 Bg4
• Queen's Gambit Accepted: Smyslov Variation: 1.d4 d5 2.c4 dxc4 3.Nf3 Nf6 4.e3 g6

• D26 QGA, Classical Variation
• Queen's Gambit Accepted: Normal Variation, Traditional System: 1.d4 d5 2.c4 dxc4 3.Nf3 Nf6 4.e3 e6
• Queen's Gambit Accepted: Classical Defense: 1.d4 d5 2.c4 dxc4 3.Nf3 Nf6 4.e3 e6 5.Bxc4 c5
• Queen's Gambit Accepted: Classical Defense, Normal Line: 1.d4 d5 2.c4 dxc4 3.Nf3 Nf6 4.e3 e6 5.Bxc4 c5 6.0-0
• Queen's Gambit Accepted: Classical Defense, Steinitz Variation, Exchange Variation: 1.d4 d5 2.c4 dxc4 3.Nf3 Nf6 4.e3 e6 5.Bxc4 c5 6.0-0 cxd4
• Queen's Gambit Accepted: Classical Defense, Steinitz Variation, Development Variation: 1.d4 d5 2.c4 dxc4 3.Nf3 Nf6 4.e3 e6 5.Bxc4 c5 6.0-0 Nc6
• Queen's Gambit Accepted: Classical, Furman Variation: 1.d4 d5 2.c4 dxc4 3.Nf3 Nf6 4.e3 e6 5.Bxc4 c5 6.Qe2 a6 7.dxc5 Bxc5 8.0-0 Nc6 9.e4 b5 10.e5

• D27 QGA, Classical Variation
• Queen's Gambit Accepted: Classical Defense, Russian Gambit: 1.d4 d5 2.c4 dxc4 3.e3 Nf6 4.Bxc4 e6 5.Nf3 c5 6.0-0 a6 7.e4
• Queen's Gambit Accepted: Classical Defense, Main Line: 1.d4 d5 2.c4 dxc4 3.Nf3 Nf6 4.e3 e6 5.Bxc4 c5 6.0-0 a6
• Queen's Gambit Accepted: Classical Defense, Rubinstein Variation: 1.d4 d5 2.c4 dxc4 3.Nf3 Nf6 4.e3 e6 5.Bxc4 c5 6.0-0 a6 7.a4
• Queen's Gambit Accepted: Furman Variation: 1.d4 d5 2.c4 dxc4 3.Nf3 Nf6 4.e3 e6 5.Bxc4 c5 6.0-0 a6 7.dxc5 Bxc5

• D28 QGA, Classical Variation 7.Qe2
• Queen's Gambit Accepted: Classical Defense, Alekhine System: 1.d4 d5 2.c4 dxc4 3.Nf3 Nf6 4.e3 e6 5.Bxc4 c5 6.0-0 a6 7.Qe2
• Queen's Gambit Accepted: Classical Defense, Alekhine System: 1.d4 d5 2.c4 dxc4 3.Nf3 Nf6 4.e3 e6 5.Bxc4 c5 6.0-0 a6 7.Qe2 b5
• Queen's Gambit Accepted: Classical, Flohr Variation: 1.d4 d5 2.c4 dxc4 3.Nf3 Nf6 4.e3 e6 5.Bxc4 c5 6.0-0 a6 7.Qe2 b5 8.Bb3 Nc6 9.Rd1 c4 10.Bc2 Nb4 11.Nc3 Nxc2 12.Qxc2 Bb7 13.d5 Qc7

• D29 QGA, Classical Variation 8...Bb7
• Queen's Gambit Accepted: Classical Defense, Alekhine System, Main Line: 1.d4 d5 2.c4 dxc4 3.Nf3 Nf6 4.e3 e6 5.Bxc4 c5 6.0-0 a6 7.Qe2 b5 8.Bb3 Bb7
• Queen's Gambit Accepted: Classical Defense, Alekhine System, Smyslov Variation: 1.d4 d5 2.c4 dxc4 3.Nf3 Nf6 4.e3 e6 5.Bxc4 c5 6.0-0 a6 7.Qe2 b5 8.Bb3 Bb7 9.Rd1 Nbd7 10.Nc3 Bd6

• D30 Queen's Gambit Declined: Orthodox Defence
• Semi-Slav Defense: Quiet Variation: 1.d4 d5 2.c4 c6 3.Nf3 Nf6 4.e3 e6 5.Nbd2
• Semi-Slav Defense: Quiet Variation: 1.d4 d5 2.c4 c6 3.Nf3 Nf6 4.e3 e6 5.Nbd2 Nbd7
• Queen's Gambit Declined: Semmering Variation: 1.d4 d5 2.c4 c6 3.Nf3 Nf6 4.e3 e6 5.Nbd2 Nbd7 6.Bd3 c5
• Queen's Gambit Declined: Stonewall Variation: 1.d4 d5 2.c4 c6 3.Nf3 Nf6 4.e3 e6 5.Nbd2 Ne4 6.Bd3 f5
• Queen's Gambit Declined: 1.d4 d5 2.c4 e6
• Queen's Gambit Declined: Tarrasch Defense, Pseudo-Tarrasch: 1.d4 d5 2.c4 e6 3.Nf3 c5
• Queen's Gambit Declined: Tarrasch Defense, Pseudo-Tarrasch Bishop Attack: 1.d4 d5 2.c4 e6 3.Nf3 c5 4.cxd5 exd5 5.Bg5
• Queen's Gambit Declined: Spielmann Variation: 1.d4 d5 2.c4 e6 3.Nf3 Nf6 4.e3 c6 5.Nbd2 g6
• Queen's Gambit Declined: Traditional Variation: 1.d4 Nf6 2.c4 e6 3.Nf3 d5 4.Bg5
• Queen's Gambit Declined: Vienna Variation: 1.d4 Nf6 2.c4 e6 3.Nf3 d5 4.Bg5 Bb4+
• Queen's Gambit Declined: Capablanca Variation: 1.d4 Nf6 2.c4 e6 3.Nf3 d5 4.Bg5 h6
• Queen's Gambit Declined: Capablanca Variation: 1.d4 Nf6 2.Nf3 e6 3.c4 d5 4.Bg5 c6 5.Nbd2 Nbd7 6.e3

• D31 QGD, 3.Nc3
• Queen's Gambit Declined: Queen's Knight Variation: 1.d4 d5 2.c4 e6 3.Nc3
• Queen's Gambit Declined: Janowski Variation: 1.d4 d5 2.c4 e6 3.Nc3 a6
• Queen's Gambit Declined: Charousek Variation: 1.d4 d5 2.c4 e6 3.Nc3 Be7
• Queen's Gambit Declined: Charousek Variation, Miladinovic Gambit: 1.d4 d5 2.c4 e6 3.Nc3 Be7 4.e4 dxe4 5.f3
• Queen's Gambit Declined: Uhlmann Variation: 1.d4 d5 2.c4 e6 3.Nc3 Be7 4.Nf3 Nf6 5.Bg5 h6 6.Bh4 0-0 7.Rc1 dxc4
• Semi-Slav Defense: Accelerated Move Order: 1.d4 d5 2.c4 e6 3.Nc3 c6
• Semi-Slav Defense: Anti-Noteboom, Stonewall Variation, Portisch Gambit: 1.d4 d5 2.c4 e6 3.Nc3 c6 4.e3 f5 5.g4
• Semi-Slav Defense: Marshall Gambit: 1.d4 d5 2.c4 e6 3.Nc3 c6 4.e4
• Semi-Slav Defense: Gunderam Gambit: 1.d4 d5 2.c4 e6 3.Nc3 c6 4.e4 dxe4 5.f3
• Semi-Slav Defense: Marshall Gambit, Main Line: 1.d4 d5 2.c4 e6 3.Nc3 c6 4.e4 dxe4 5.Nxe4 Bb4+ 6.Bd2
• Semi-Slav Defense: Marshall Gambit, Tolush Variation: 1.d4 d5 2.c4 e6 3.Nc3 c6 4.e4 dxe4 5.Nxe4 Bb4+ 6.Bd2 Qxd4 7.Bxb4 Qxe4+ 8.Be2 c5 9.Bxc5 Qxg2
• Semi-Slav Defense: Marshall Gambit, Forgotten Variation: 1.d4 d5 2.c4 e6 3.Nc3 c6 4.e4 dxe4 5.Nxe4 Bb4+ 6.Nc3
• Semi-Slav Defense: Noteboom Variation: 1.d4 d5 2.c4 e6 3.Nc3 c6 4.Nf3 dxc4
• Queen's Gambit Declined: Semi-Slav, Abrahams Variation: 1.d4 d5 2.c4 e6 3.Nc3 c6 4.Nf3 dxc4 5.a4 Bb4 6.e3 b5 7.Bd2 a5
• Semi-Slav Defense: Noteboom Variation, Abrahams Variation: 1.d4 d5 2.c4 e6 3.Nc3 c6 4.Nf3 dxc4 5.a4 Bb4 6.e3 Bxc3+ 7.bxc3 b5 8.axb5 cxb5
• Semi-Slav Defense: Noteboom Variation, Anti-Noteboom Variation: 1.d4 d5 2.c4 e6 3.Nc3 c6 4.Nf3 dxc4 5.Bg5
• Semi-Slav Defense: Noteboom Variation, Anti-Noteboom Variation, Belyavsky Line: 1.d4 d5 2.c4 e6 3.Nc3 c6 4.Nf3 dxc4 5.Bg5 f6
• Queen's Gambit Declined: Semi-Slav, Koomen Variation: 1.d4 d5 2.c4 e6 3.Nc3 c6 4.Nf3 dxc4 5.e3 b5 6.a4 Bb4 7.Bd2 Qe7
• Semi-Slav Defense: Noteboom Variation, Anti-Noteboom Gambit: 1.d4 d5 2.c4 e6 3.Nc3 c6 4.Nf3 dxc4 5.g3
• Queen's Gambit Declined: Semi-Slav, Junge Variation: 1.d4 d5 2.c4 e6 3.Nf3 c6 4.Nc3 dxc4 5.a4 Bb4 6.e3 b5 7.Bd2 Qb6
• Queen's Gambit Declined: Alapin Variation: 1.d4 e6 2.c4 b6 3.Nc3 d5

• D32 QGD, Tarrasch Defence
• Tarrasch Defense: 1.d4 d5 2.c4 e6 3.Nc3 c5
• Tarrasch Defense: Schara Gambit: 1.d4 d5 2.c4 e6 3.Nc3 c5 4.cxd5 cxd4
• Tarrasch Defense: von Hennig Gambit: 1.d4 d5 2.c4 e6 3.Nc3 c5 4.cxd5 cxd4 5.Qxd4 Nc6 6.Qd1 exd5 7.Qxd5 Be6
• Queen's Gambit Declined: Tarrasch Defense: 1.d4 d5 2.c4 e6 3.Nc3 c5 4.cxd5 exd5
• Tarrasch Defense: Tarrasch Gambit: 1.d4 d5 2.c4 e6 3.Nc3 c5 4.cxd5 exd5 5.dxc5 d4 6.Na4 b5
• Tarrasch Defense: Marshall Gambit: 1.d4 d5 2.c4 e6 3.Nc3 c5 4.cxd5 exd5 5.e4
• Tarrasch Defense: Two Knights Variation: 1.d4 d5 2.c4 e6 3.Nc3 c5 4.cxd5 exd5 5.Nf3
• Tarrasch Defense: Grünfeld Gambit: 1.d4 d5 2.c4 e6 3.Nc3 c5 4.cxd5 exd5 5.Nf3 Nc6 6.dxc5 d4 7.Na4 b5
• Tarrasch Defense: Symmetrical Variation: 1.d4 d5 2.c4 e6 3.Nc3 c5 4.e3 Nf6 5.Nf3 Nc6

• D33 QGD, Tarrasch, Schlechter–Rubinstein System
• Tarrasch Defense: Rubinstein System: 1.d4 d5 2.c4 e6 3.Nc3 c5 4.cxd5 exd5 5.Nf3 Nc6 6.g3
• Tarrasch Defense: Swedish Variation: 1.d4 d5 2.c4 e6 3.Nc3 c5 4.cxd5 exd5 5.Nf3 Nc6 6.g3 c4
• Tarrasch Defense: Swedish Variation, Central Break: 1.d4 d5 2.c4 e6 3.Nc3 c5 4.cxd5 exd5 5.Nf3 Nc6 6.g3 c4 7.e4
• Tarrasch Defense: Prague Variation: 1.d4 d5 2.c4 e6 3.Nc3 c5 4.cxd5 exd5 5.Nf3 Nc6 6.g3 Nf6
• Tarrasch Defense: Wagner Variation: 1.d4 d5 2.c4 e6 3.Nc3 c5 4.cxd5 exd5 5.Nf3 Nc6 6.g3 Nf6 7.Bg2 Bg4
• Tarrasch Defense: Dubov Tarrasch: 1.d4 d5 2.c4 e6 3.Nc3 c5 4.cxd5 exd5 5.Nf3 Nc6 6.g3 Nf6 7.Bg2 cxd4 8.Nxd4 Bc5

• D34 QGD, Tarrasch, 7...Be7
• Tarrasch Defense: Prague Variation, Main Line: 1.d4 d5 2.c4 e6 3.Nc3 c5 4.cxd5 exd5 5.Nf3 Nc6 6.g3 Nf6 7.Bg2 Be7
• Tarrasch Defense: Classical Variation: 1.d4 d5 2.c4 e6 3.Nc3 c5 4.cxd5 exd5 5.Nf3 Nc6 6.g3 Nf6 7.Bg2 Be7 8.0-0 0-0
• Tarrasch Defense: Classical Variation, Carlsbad Variation: 1.d4 d5 2.c4 e6 3.Nc3 c5 4.cxd5 exd5 5.Nf3 Nc6 6.g3 Nf6 7.Bg2 Be7 8.0-0 0-0 9.Bg5
• Tarrasch Defense: Classical Variation, Endgame Variation: 1.d4 d5 2.c4 e6 3.Nc3 c5 4.cxd5 exd5 5.Nf3 Nc6 6.g3 Nf6 7.Bg2 Be7 8.0-0 0-0 9.Bg5 Be6
• Tarrasch Defense: Classical Variation, Advance Variation: 1.d4 d5 2.c4 e6 3.Nc3 c5 4.cxd5 exd5 5.Nf3 Nc6 6.g3 Nf6 7.Bg2 Be7 8.0-0 0-0 9.Bg5 c4
• Tarrasch Defense: Classical Variation, Spassky Variation: 1.d4 d5 2.c4 e6 3.Nc3 c5 4.cxd5 exd5 5.Nf3 Nc6 6.g3 Nf6 7.Bg2 Be7 8.0-0 0-0 9.Bg5 cxd4 10.Nxd4 h6 11.Be3 Bg4
• Tarrasch Defense: Classical Variation, Main Line: 1.d4 d5 2.c4 e6 3.Nc3 c5 4.cxd5 exd5 5.Nf3 Nc6 6.g3 Nf6 7.Bg2 Be7 8.0-0 0-0 9.Bg5 cxd4 10.Nxd4 h6 11.Be3 Re8
• Tarrasch Defense: Classical Variation, Chandler Variation: 1.d4 d5 2.c4 e6 3.Nc3 c5 4.cxd5 exd5 5.Nf3 Nc6 6.g3 Nf6 7.Bg2 Be7 8.0-0 0-0 9.Bg5 cxd4 10.Nxd4 h6 11.Be3 Re8 12.Rc1 Be6
• Tarrasch Defense: Classical Variation, Petursson Variation: 1.d4 d5 2.c4 e6 3.Nc3 c5 4.cxd5 exd5 5.Nf3 Nc6 6.g3 Nf6 7.Bg2 Be7 8.0-0 0-0 9.Bg5 cxd4 10.Nxd4 Re8
• Tarrasch Defense: Classical Variation, Réti Variation: 1.d4 d5 2.c4 e6 3.Nc3 c5 4.cxd5 exd5 5.Nf3 Nc6 6.g3 Nf6 7.Bg2 Be7 8.0-0 0-0 9.dxc5 Bxc5 10.Na4
• Tarrasch Defense: Classical Variation, Classical Tarrasch Gambit: 1.d4 d5 2.c4 e6 3.Nc3 c5 4.cxd5 exd5 5.Nf3 Nc6 6.g3 Nf6 7.Bg2 Be7 8.0-0 0-0 9.dxc5 d4
• Queen's Gambit Declined: Tarrasch Defense, Stoltz Variation: 1.d4 d5 2.c4 e6 3.Nf3 c5 4.cxd5 exd5 5.g3 Nc6 6.Bg2 Nf6 7.0-0 Be7 8.Nc3 0-0 9.Bg5 Be6 10.Rc1 b6
• Tarrasch Defense: Classical Variation, Bogoljubow Variation: 1.d4 Nf6 2.c4 e6 3.Nc3 c5 4.Nf3 d5 5.cxd5 exd5 6.g3 Nc6 7.Bg2 Be7 8.0-0 0-0 9.Bg5 Be6 10.Rc1 c4

• D35 QGD, Exchange Variation
• Queen's Gambit Declined: Normal Defense: 1.d4 d5 2.c4 e6 3.Nc3 Nf6
• Queen's Gambit Declined: Harrwitz Attack: 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Bf4
• Queen's Gambit Declined: Exchange Variation: 1.d4 Nf6 2.c4 e6 3.Nc3 d5 4.cxd5
• Queen's Gambit Declined: Exchange Variation, Positional Variation: 1.d4 Nf6 2.c4 e6 3.Nc3 d5 4.cxd5 exd5 5.Bg5
• Queen's Gambit Declined: Exchange Variation, Chameleon Variation: 1.d4 Nf6 2.c4 e6 3.Nc3 d5 4.cxd5 exd5 5.Bg5 Be7 6.e3 0-0 7.Bd3 Nbd7 8.Qc2 Re8 9.Nge2 Nf8 10.0-0-0
• Queen's Gambit Declined: Exchange Variation, Positional Variation: 1.d4 Nf6 2.c4 e6 3.Nc3 d5 4.cxd5 exd5 5.Bg5 c6
• Queen's Gambit Declined: Exchange Variation, Sämisch Variation: 1.d4 Nf6 2.c4 e6 3.Nf3 d5 4.Nc3 Nbd7 5.cxd5 exd5 6.Bf4

• D36 QGD, Exchange, positional line, 6.Qc2
• Queen's Gambit Declined: Exchange Variation, Reshevsky Variation: 1.d4 Nf6 2.c4 e6 3.Nc3 d5 4.cxd5 exd5 5.Bg5 c6 6.Qc2

• D37 QGD, 4.Nf3
• Queen's Gambit Declined: Harrwitz Attack, Fianchetto Defense: 1.d4 d5 2.c4 e6 3.Nc3 Be7 4.Nf3 Nf6 5.Bf4 0-0 6.e3 b6
• Queen's Gambit Declined: Harrwitz Attack, Orthodox Defense: 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Nf3 Be7 5.Bf4 0-0 6.e3 c6
• Queen's Gambit Declined: Harrwitz Attack, Two Knights Defense, Blockade Line: 1.d4 Nf6 2.c4 e6 3.Nc3 d5 4.Nf3 Be7 5.Bf4 0-0 6.e3 Nbd7 7.c5
• Queen's Gambit Declined: Three Knights Variation: 1.d4 Nf6 2.c4 e6 3.Nf3 d5 4.Nc3
• Queen's Gambit Declined: Harrwitz Attack: 1.d4 Nf6 2.c4 e6 3.Nf3 d5 4.Nc3 Be7 5.Bf4
• Queen's Gambit Declined: Harrwitz Attack, Main Line: 1.d4 Nf6 2.c4 e6 3.Nf3 d5 4.Nc3 Be7 5.Bf4 0-0 6.e3 c5 7.dxc5 Bxc5
• Queen's Gambit Declined: Harrwitz Attack: 1.d4 Nf6 2.c4 e6 3.Nf3 d5 4.Nc3 Be7 5.Bf4 0-0 6.e3 c5 7.dxc5 Bxc5 8.Qc2 Nc6 9.a3 Qa5 10.0-0-0
• Queen's Gambit Declined: Harrwitz Attack: 1.d4 Nf6 2.c4 e6 3.Nf3 d5 4.Nc3 Be7 5.Bf4 0-0 6.e3 c5 7.dxc5 Bxc5 8.Qc2 Nc6 9.Rd1 Qa5 10.a3
• Queen's Gambit Declined: Harrwitz Attack, Two Knights Defense: 1.d4 Nf6 2.c4 e6 3.Nf3 d5 4.Nc3 Be7 5.Bf4 0-0 6.e3 Nbd7
• Queen's Gambit Declined: Miles Variation: 1.d4 Nf6 2.c4 e6 3.Nf3 d5 4.Nc3 Be7 5.Bg5 0-0 6.Qc2
• Queen's Gambit Declined: Three Knights, Vienna Variation: 1.d4 Nf6 2.c4 e6 3.Nf3 d5 4.Nc3 dxc4
• Queen's Gambit Declined: Vienna Variation, Quiet Variation: 1.d4 Nf6 2.c4 e6 3.Nf3 d5 4.Nc3 dxc4 5.e3
• Queen's Gambit Declined: Barmen Variation: 1.d4 Nf6 2.c4 e6 3.Nf3 d5 4.Nc3 Nbd7
• Queen's Gambit Declined: Knight Defense, Alekhine Gambit: 1.d4 Nf6 2.c4 e6 3.Nf3 d5 4.Nc3 Nbd7 5.Bg5 h6 6.Bh4 dxc4

• D38 QGD, Ragozin Variation
• Queen's Gambit Declined: Ragozin Defense: 1.d4 Nf6 2.c4 e6 3.Nf3 d5 4.Nc3 Bb4
• Queen's Gambit Declined: Westphalian Variation: 1.d4 Nf6 2.c4 e6 3.Nf3 d5 4.Nc3 Bb4 5.Bg5 Nbd7 6.e3 c5
• Queen's Gambit Declined: Ragozin Defense, Alekhine Variation: 1.d4 Nf6 2.c4 e6 3.Nf3 d5 4.Nc3 Bb4 5.Qa4+

• D39 QGD, Ragozin, Vienna Variation
• Queen's Gambit Declined: Ragozin Defense, Vienna Variation: 1.d4 Nf6 2.c4 e6 3.Nf3 d5 4.Nc3 Bb4 5.Bg5 dxc4

• D40 QGD, Semi-Tarrasch Defence
• Queen's Gambit Declined: Semi-Tarrasch Defense, Pillsbury Variation: 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Nf3 c5 5.Bg5
• Queen's Gambit Declined: Semi-Tarrasch Defense, Symmetrical Variation: 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Nf3 c5 5.e3 Nc6 6.Bd3 Bd6 7.0-0 0-0
• Queen's Gambit Declined: Semi-Tarrasch Defense, Levenfish Variation: 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Nf3 c5 5.e3 Nc6 6.Bd3 Bd6 7.0-0 0-0 8.Qe2 Qe7 9.dxc5 Bxc5 10.e4
• Queen's Gambit Declined: Semi-Tarrasch Defense: 1.d4 Nf6 2.c4 e6 3.Nf3 d5 4.Nc3 c5

• D41 QGD, Semi-Tarrasch, 5.cxd5
• Queen's Gambit Declined: Semi-Tarrasch Defense, San Sebastian Variation: 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.cxd5 Nxd5 5.e4 Nxc3 6.bxc3 c5 7.Nf3 cxd4 8.cxd4 Bb4+ 9.Bd2 Qa5
• Queen's Gambit Declined: Semi-Tarrasch Defense, Kmoch Variation: 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Nf3 c5 5.cxd5 Nxd5 6.e4 Nxc3 7.bxc3 cxd4 8.cxd4 Bb4+ 9.Bd2 Bxd2+ 10.Qxd2 0-0 11.Bb5
• Queen's Gambit Declined: Semi-Tarrasch Defense: 1.d4 Nf6 2.c4 e6 3.Nf3 d5 4.Nc3 c5 5.cxd5
• Queen's Gambit Declined: Semi-Tarrasch Defense, Pillsbury Variation: 1.d4 Nf6 2.c4 e6 3.Nf3 d5 4.Nc3 c5 5.cxd5 Nxd5 6.e3
• Queen's Gambit Declined: Semi-Tarrasch Defense, Exchange Variation: 1.d4 Nf6 2.c4 e6 3.Nf3 d5 4.Nc3 c5 5.cxd5 Nxd5 6.e4

• D42 QGD, Semi-Tarrasch, 7.Bd3
• Queen's Gambit Declined: Semi-Tarrasch Defense, Main Line: 1.d4 Nf6 2.c4 e6 3.Nf3 d5 4.Nc3 c5 5.cxd5 Nxd5 6.e3 Nc6 7.Bd3

• D43 QGD, Semi-Slav Defence
• Semi-Slav Defense: 1.d4 d5 2.c4 c6 3.Nf3 Nf6 4.Nc3 e6
• Semi-Slav Defense: Anti-Moscow Gambit: 1.d4 d5 2.c4 c6 3.Nf3 Nf6 4.Nc3 e6 5.Bg5 h6 6.Bh4
• Queen's Gambit Declined: Hastings Variation: 1.d4 d5 2.c4 c6 3.Nf3 Nf6 4.Nc3 e6 5.Bg5 h6 6.Bxf6 Qxf6 7.Qb3

• D44 QGD, Semi-Slav, 5.Bg5 dxc4
• Semi-Slav Defense Accepted: 1.d4 d5 2.c4 c6 3.Nf3 Nf6 4.Nc3 e6 5.Bg5 dxc4
• Semi-Slav Defense: Botvinnik Variation: 1.d4 d5 2.c4 c6 3.Nf3 Nf6 4.Nc3 e6 5.Bg5 dxc4 6.e4
• Semi-Slav Defense: Botvinnik Variation, Ekstrom Variation: 1.d4 d5 2.c4 c6 3.Nf3 Nf6 4.Nc3 e6 5.Bg5 dxc4 6.e4 b5 7.e5 h6 8.Bh4 g5 9.exf6 gxh4 10.Ne5
• Semi-Slav Defense: Botvinnik Variation: 1.d4 d5 2.c4 c6 3.Nf3 Nf6 4.Nc3 e6 5.Bg5 dxc4 6.e4 b5 7.e5 h6 8.Bh4 g5 9.Nxg5
• Semi-Slav Defense: Botvinnik Variation, Lilienthal Variation: 1.d4 d5 2.c4 c6 3.Nf3 Nf6 4.Nc3 e6 5.Bg5 dxc4 6.e4 b5 7.e5 h6 8.Bh4 g5 9.Nxg5 hxg5 10.Bxg5 Nbd7 11.g3
• Semi-Slav Defense: Botvinnik Variation, Szabo Variation: 1.d4 Nf6 2.c4 e6 3.Nf3 d5 4.Nc3 c6 5.Bg5 dxc4 6.e4 b5 7.e5 h6 8.Bh4 g5 9.Nxg5 hxg5 10.Bxg5 Nbd7 11.Qf3
• Semi-Slav Defense: Botvinnik Variation, Alatortsev System: 1.d4 Nf6 2.c4 e6 3.Nf3 d5 4.Nc3 c6 5.Bg5 dxc4 6.e4 b5 7.e5 h6 8.Bh4 g5 9.Nxg5 Nd5

• D45 QGD, Semi-Slav, 5.e3
• Semi-Slav Defense: Main Line: 1.d4 d5 2.c4 c6 3.Nc3 Nf6 4.e3 e6 5.Nf3
• Semi-Slav Defense: Accelerated Meran Variation: 1.d4 d5 2.c4 c6 3.Nc3 Nf6 4.e3 e6 5.Nf3 a6
• Semi-Slav Defense: Normal Variation: 1.d4 d5 2.c4 c6 3.Nc3 Nf6 4.e3 e6 5.Nf3 Nbd7
• Semi-Slav Defense: Stoltz Variation: 1.d4 d5 2.c4 c6 3.Nc3 Nf6 4.e3 e6 5.Nf3 Nbd7 6.Qc2
• Semi-Slav Defense: Stoltz Variation: 1.d4 d5 2.c4 c6 3.Nc3 Nf6 4.e3 e6 5.Nf3 Nbd7 6.Qc2 b6 7.b3
• Semi-Slav Defense: Stoltz Variation, Center Variation: 1.d4 d5 2.c4 c6 3.Nf3 Nf6 4.Nc3 e6 5.e3 Nbd7 6.Qc2 Bd6 7.e4
• Semi-Slav Defense: Stoltz Variation, Center Variation, Mikhalchishin Line: 1.d4 d5 2.c4 c6 3.Nf3 Nf6 4.Nc3 e6 5.e3 Nbd7 6.Qc2 Bd6 7.e4 dxe4 8.Nxe4 Nxe4 9.Qxe4 e5 10.dxe5
• Semi-Slav Defense: Stoltz Variation, Shabalov Attack: 1.d4 d5 2.c4 c6 3.Nf3 Nf6 4.Nc3 e6 5.e3 Nbd7 6.Qc2 Bd6 7.g4
• Semi-Slav Defense: Rubinstein System: 1.d4 d5 2.c4 e6 3.Nc3 c6 4.Nf3 Nf6 5.e3 Nbd7 6.Ne5
• Semi-Slav Defense: Stoltz Variation: 1.d4 d5 2.Nf3 Nf6 3.c4 c6 4.e3 e6 5.Nc3 Nbd7 6.Qc2 Bd6 7.b3
• Semi-Slav Defense: Stoltz Variation: 1.d4 d5 2.Nf3 Nf6 3.c4 c6 4.e3 e6 5.Nc3 Nbd7 6.Qc2 Bd6 7.b3 0-0 8.Bb2
• Semi-Slav Defense: Stonewall Defense: 1.d4 d5 2.Nf3 Nf6 3.c4 c6 4.Nc3 e6 5.e3 Ne4 6.Bd3 f5

• D46 QGD, Semi-Slav, 6.Bd3
• Semi-Slav Defense: Main Line: 1.d4 d5 2.c4 c6 3.Nc3 Nf6 4.e3 e6 5.Nf3 Nbd7 6.Bd3
• Semi-Slav Defense: Romih Variation: 1.d4 d5 2.c4 c6 3.Nc3 Nf6 4.e3 e6 5.Nf3 Nbd7 6.Bd3 Bb4
• Semi-Slav Defense: Chigorin Defense: 1.d4 d5 2.c4 c6 3.Nc3 Nf6 4.e3 e6 5.Nf3 Nbd7 6.Bd3 Bd6
• Semi-Slav Defense: Chigorin Defense: 1.d4 d5 2.c4 c6 3.Nc3 Nf6 4.e3 e6 5.Nf3 Nbd7 6.Bd3 Bd6 7.Qc2
• Semi-Slav Defense: Bogoljubow Variation: 1.d4 d5 2.c4 c6 3.Nc3 Nf6 4.e3 e6 5.Nf3 Nbd7 6.Bd3 Be7
• Semi-Slav Defense: Main Line: 1.d4 d5 2.c4 c6 3.Nc3 Nf6 4.e3 e6 5.Nf3 Nbd7 6.Qc2 b6 7.b3 Bb7 8.Bd3 Be7 9.0-0 0-0 10.Bb2

• D47 QGD, Semi-Slav, 7.Bc4
• Semi-Slav Defense: Semi-Meran Variation: 1.d4 d5 2.c4 c6 3.Nc3 Nf6 4.e3 e6 5.Nf3 Nbd7 6.Bd3 dxc4 7.Bxc4
• Semi-Slav Defense: Meran Variation: 1.d4 d5 2.c4 c6 3.Nc3 Nf6 4.e3 e6 5.Nf3 Nbd7 6.Bd3 dxc4 7.Bxc4 b5
• Semi-Slav Defense: Meran Variation, Wade Variation: 1.d4 d5 2.c4 c6 3.Nc3 Nf6 4.e3 e6 5.Nf3 Nbd7 6.Bd3 dxc4 7.Bxc4 b5 8.Bd3 Bb7
• Semi-Slav Defense: Meran Variation, Wade Variation, Larsen Variation: 1.d4 d5 2.c4 c6 3.Nc3 Nf6 4.e3 e6 5.Nf3 Nbd7 6.Bd3 dxc4 7.Bxc4 b5 8.Bd3 Bb7 9.e4 b4 10.Na4 c5 11.e5 Nd5
• Semi-Slav Defense: Meran Variation, Wade Variation, Kaidanov Gambit: 1.d4 d5 2.c4 c6 3.Nc3 Nf6 4.e3 e6 5.Nf3 Nbd7 6.Bd3 dxc4 7.Bxc4 b5 8.Bd3 Bb7 9.e4 b4 10.Na4 c5 11.e5 Nd5 12.0-0 cxd4 13.Nxd4
• Semi-Slav Defense: Meran Variation, Lundin Variation: 1.d4 d5 2.c4 c6 3.Nf3 Nf6 4.Nc3 e6 5.e3 Nbd7 6.Bd3 dxc4 7.Bxc4 b5 8.Bd3 b4

• D48 QGD, Meran, 8...a6
• Semi-Slav Defense: Meran Variation: 1.d4 d5 2.c4 c6 3.Nc3 Nf6 4.e3 e6 5.Nf3 Nbd7 6.Bd3 dxc4 7.Bxc4 b5 8.Bd3 a6
• Semi-Slav Defense: Meran Variation: 1.d4 d5 2.c4 c6 3.Nc3 Nf6 4.e3 e6 5.Nf3 Nbd7 6.Bd3 dxc4 7.Bxc4 b5 8.Bd3 a6 9.e4 c5
• Semi-Slav Defense: Meran Variation, Old Variation: 1.d4 d5 2.c4 c6 3.Nc3 Nf6 4.e3 e6 5.Nf3 Nbd7 6.Bd3 dxc4 7.Bxc4 b5 8.Bd3 a6 9.e4 c5 10.e5
• Semi-Slav Defense: Meran Variation, Reynolds' Variation: 1.d4 d5 2.c4 c6 3.Nf3 Nf6 4.Nc3 e6 5.e3 Nbd7 6.Bd3 dxc4 7.Bxc4 b5 8.Bd3 a6 9.e4 c5 10.d5
• Semi-Slav Defense: Meran Variation, Pirc Variation: 1.d4 d5 2.c4 e6 3.Nc3 c6 4.e3 Nf6 5.Nf3 Nbd7 6.Bd3 dxc4 7.Bxc4 b5 8.Bd3 a6 9.e4 b4

• D49 QGD, Meran, 11.Nxb5
• Semi-Slav Defense: Meran Variation, Blumenfeld Variation: 1.d4 d5 2.c4 c6 3.Nc3 Nf6 4.e3 e6 5.Nf3 Nbd7 6.Bd3 dxc4 7.Bxc4 b5 8.Bd3 a6 9.e4 c5 10.e5 cxd4 11.Nxb5
• Semi-Slav Defense: Meran Variation, Rabinovich Variation: 1.d4 d5 2.c4 c6 3.Nc3 Nf6 4.e3 e6 5.Nf3 Nbd7 6.Bd3 dxc4 7.Bxc4 b5 8.Bd3 a6 9.e4 c5 10.e5 cxd4 11.Nxb5 Ng4
• Semi-Slav Defense: Meran Variation, Stahlberg Variation: 1.d4 d5 2.c4 c6 3.Nc3 Nf6 4.e3 e6 5.Nf3 Nbd7 6.Bd3 dxc4 7.Bxc4 b5 8.Bd3 a6 9.e4 c5 10.e5 cxd4 11.Nxb5 Nxe5 12.Nxe5 axb5 13.Qf3
• Semi-Slav Defense: Meran Variation, Rellstab Attack: 1.d4 d5 2.c4 c6 3.Nc3 Nf6 4.Nf3 e6 5.e3 Nbd7 6.Bd3 dxc4 7.Bxc4 b5 8.Bd3 a6 9.e4 c5 10.e5 cxd4 11.Nxb5 Nxe5 12.Nxe5 axb5 13.0-0 Qd5 14.Qe2 Ba6 15.Bg5
• Semi-Slav Defense: Meran Variation, Sozin Variation: 1.d4 d5 2.c4 c6 3.Nf3 Nf6 4.Nc3 e6 5.e3 Nbd7 6.Bd3 dxc4 7.Bxc4 b5 8.Bd3 a6 9.e4 c5 10.e5 cxd4 11.Nxb5 Nxe5
• Semi-Slav Defense: Meran Variation, Sozin Variation: 1.d4 d5 2.Nf3 Nf6 3.c4 c6 4.Nc3 e6 5.e3 Nbd7 6.Bd3 dxc4 7.Bxc4 b5 8.Bd3 a6 9.e4 c5 10.e5 cxd4 11.Nxb5 Nxe5 12.Nxe5 axb5 13.0-0

• D50 QGD, 4.Bg5
• Queen's Gambit Declined: Modern Variation: 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Bg5
• Queen's Gambit Declined: Been-Koomen Variation: 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Bg5 c5
• Queen's Gambit Declined: Pseudo-Tarrasch Variation: 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Bg5 c5 5.cxd5
• Queen's Gambit Declined: Pseudo-Tarrasch Variation, Canal Variation: 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Bg5 c5 5.cxd5 Qb6
• Queen's Gambit Declined: Semi-Tarrasch Defense, Krause Variation: 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Bg5 c5 5.Nf3 cxd4 6.Nxd4 e5 7.Ndb5 a6 8.Qa4
• Queen's Gambit Declined: Pseudo-Tarrasch Variation, Primitive Pillsbury Variation: 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Bg5 c5 5.Nf3 cxd4 6.Qxd4

• D51 QGD, 4.Bg5 Nbd7 (Cambridge Springs Defence and Elephant Trap)
• Queen's Gambit Declined: Modern Variation, Knight Defense: 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Bg5 Nbd7
• Queen's Gambit Declined: Modern Variation, Knight Defense: 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Bg5 Nbd7 5.e3
• Queen's Gambit Declined: Manhattan Variation: 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Bg5 Nbd7 5.e3 Bb4
• Queen's Gambit Declined: Modern Variation, Knight Defense: 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Bg5 Nbd7 5.e3 c6
• Queen's Gambit Declined: Capablanca Variation, Anti-Cambridge Springs Variation: 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Bg5 Nbd7 5.e3 c6 6.a3
• Queen's Gambit Declined: Alekhine Variation: 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Bg5 Nbd7 5.Nf3 c6 6.e4
• Queen's Gambit Declined: Rochlin Variation: 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Bg5 Nbd7 5.Nf3 c6 6.Rc1 Qa5 7.Bd2

• D52 QGD
• Queen's Gambit Declined: 1.d4 d5 2.c4 c6 3.Nf3 Nf6 4.Nc3 e6 5.Bg5 Nbd7 6.e3
• Queen's Gambit Declined: Cambridge Springs Defense: 1.d4 d5 2.c4 c6 3.Nf3 Nf6 4.Nc3 e6 5.Bg5 Nbd7 6.e3 Qa5
• Queen's Gambit Declined: Cambridge Springs Defense: 1.d4 d5 2.c4 c6 3.Nf3 Nf6 4.Nc3 e6 5.Bg5 Nbd7 6.e3 Qa5 7.cxd5
• Queen's Gambit Declined: Cambridge Springs Defense, Yugoslav Variation: 1.d4 d5 2.c4 c6 3.Nf3 Nf6 4.Nc3 e6 5.Bg5 Nbd7 6.e3 Qa5 7.cxd5 Nxd5
• Queen's Gambit Declined: Cambridge Springs Defense, Bogoljubow Variation: 1.d4 d5 2.c4 c6 3.Nf3 Nf6 4.Nc3 e6 5.Bg5 Nbd7 6.e3 Qa5 7.Nd2 Bb4 8.Qc2
• Queen's Gambit Declined: Cambridge Springs Defense, Rubinstein Variation: 1.d4 d5 2.c4 c6 3.Nf3 Nf6 4.Nc3 e6 5.Bg5 Nbd7 6.e3 Qa5 7.Nd2 dxc4
• Queen's Gambit Declined: Cambridge Springs Defense, Capablanca Variation: 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Bg5 Nbd7 5.e3 c6 6.Nf3 Qa5 7.Bxf6
• Queen's Gambit Declined: Cambridge Springs Defense, Argentine Variation: 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Bg5 Nbd7 5.e3 c6 6.Nf3 Qa5 7.Nd2 Bb4 8.Qc2 0-0 9.Bh4

• D53 QGD, 4.Bg5 Be7
• Queen's Gambit Declined: 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Bg5 Be7
• Queen's Gambit Declined: Modern Variation, Heral Variation: 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Bg5 Be7 5.Bxf6
• Queen's Gambit Declined: Lasker Defense: 1.d4 Nf6 2.c4 e6 3.Nc3 d5 4.Bg5 Be7 5.e3 Ne4

• D54 QGD, Anti-ne0-0rthodox Variation
• Queen's Gambit Declined: Ne0-0rthodox Variation: 1.d4 Nf6 2.c4 e6 3.Nc3 d5 4.Bg5 Be7 5.e3 0-0 6.Rc1

• D55 QGD, 6.Nf3
• Queen's Gambit Declined: Pillsbury Attack: 1.d4 Nf6 2.c4 e6 3.Nf3 b6 4.Nc3 d5 5.cxd5 exd5 6.Bg5 Be7 7.e3 0-0 8.Bd3 Bb7 9.Ne5
• Queen's Gambit Declined: Ne0-0rthodox Variation, Main Line: 1.d4 Nf6 2.c4 e6 3.Nf3 d5 4.Nc3 Be7 5.Bg5 h6 6.Bh4 0-0 7.e3
• Queen's Gambit Declined: Anti-Tartakower Variation, Petrosian Variation: 1.d4 Nf6 2.c4 e6 3.Nf3 d5 4.Nc3 Be7 5.Bg5 h6 6.Bxf6 Bxf6 7.e3 0-0 8.Rc1 c6 9.Bd3 Nd7 10.0-0 dxc4 11.Bxc4
• Queen's Gambit Declined: Modern Variation, Normal Line: 1.d4 Nf6 2.c4 e6 3.Nf3 d5 4.Nc3 Be7 5.Bg5 0-0 6.e3
• Queen's Gambit Declined: Ne0-0rthodox Variation: 1.d4 Nf6 2.c4 e6 3.Nf3 d5 4.Nc3 Be7 5.Bg5 0-0 6.e3 h6
• Queen's Gambit Declined: Anti-Tartakower Variation: 1.d4 Nf6 2.c4 e6 3.Nf3 d5 4.Nc3 Be7 5.Bg5 0-0 6.e3 h6 7.Bxf6

• D56 QGD, Lasker Defence
• Queen's Gambit Declined: Lasker Defense: 1.d4 d5 2.c4 e6 3.Nc3 Be7 4.Nf3 Nf6 5.Bg5 h6 6.Bh4 0-0 7.e3 Ne4
• Queen's Gambit Declined: Lasker Defense, Russian Variation: 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Bg5 Be7 5.e3 0-0 6.Nf3 h6 7.Bh4 Ne4 8.Bxe7 Qxe7 9.Qc2 Nf6 10.Bd3 dxc4 11.Bxc4 c5 12.0-0 Nc6 13.Rfd1 Bd7
• Queen's Gambit Declined: Lasker Defense, Teichmann Variation: 1.d4 Nf6 2.c4 e6 3.Nf3 d5 4.Nc3 Be7 5.Bg5 h6 6.Bh4 0-0 7.e3 Ne4 8.Bxe7 Qxe7 9.Qc2

• D57 QGD, Lasker Defence, Main line
• Queen's Gambit Declined: Lasker Defense, Main Line: 1.d4 d5 2.c4 e6 3.Nc3 Be7 4.Nf3 Nf6 5.Bg5 h6 6.Bh4 0-0 7.e3 Ne4 8.Bxe7 Qxe7 9.cxd5 Nxc3 10.bxc3
• Queen's Gambit Declined: Lasker Defense, Bernstein Variation, Mar del Plata Gambit: 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Bg5 Be7 5.e3 0-0 6.Nf3 h6 7.Bh4 Ne4 8.Bxe7 Qxe7 9.cxd5 Nxc3 10.bxc3 exd5 11.Qb3 Rd8 12.c4 Be6
• Queen's Gambit Declined: Lasker Defense, Bernstein Variation: 1.d4 Nf6 2.c4 e6 3.Nc3 d5 4.Bg5 Be7 5.e3 h6 6.Bh4 0-0 7.Nf3 Ne4 8.Bxe7 Qxe7 9.cxd5 Nxc3 10.bxc3 exd5 11.Qb3 Qd6

• D58 QGD, Tartakower (Tartakower–Makogonov–Bondarevsky) System
• Queen's Gambit Declined: Tartakower Defense, Exchange Variation: 1.d4 d5 2.c4 e6 3.Nc3 Be7 4.Nf3 Nf6 5.Bg5 h6 6.Bh4 0-0 7.e3 b6 8.cxd5 exd5
• Queen's Gambit Declined: Tartakower Defense: 1.d4 Nf6 2.c4 e6 3.Nf3 d5 4.Nc3 Be7 5.Bg5 h6 6.Bh4 0-0 7.e3 b6

• D59 QGD, Tartakower (Tartakower–Makogonov–Bondarevsky) System, 8.cxd5 Nxd5
• Queen's Gambit Declined: Tartakower Defense, Makogonov Exchange Variation: 1.d4 d5 2.c4 e6 3.Nc3 Be7 4.Nf3 Nf6 5.Bg5 h6 6.Bh4 0-0 7.e3 b6 8.cxd5 Nxd5
• Queen's Gambit Declined: Tartakower Defense: 1.d4 d5 2.c4 e6 3.Nc3 Be7 4.Nf3 Nf6 5.Bg5 h6 6.Bh4 0-0 7.e3 b6 8.cxd5 Nxd5 9.Bxe7 Qxe7 10.Nxd5 exd5 11.Rc1 Be6

• D60 QGD, Orthodox Defence
• Queen's Gambit Declined: Orthodox Defense, Rauzer Variation: 1.d4 d5 2.Nf3 Nf6 3.c4 e6 4.Nc3 Be7 5.Bg5 0-0 6.e3 Nbd7 7.Qb3
• Queen's Gambit Declined: Orthodox Defense: 1.d4 Nf6 2.c4 e6 3.Nf3 d5 4.Nc3 Be7 5.Bg5 0-0 6.e3 Nbd7
• Queen's Gambit Declined: Orthodox Defense, Botvinnik Variation: 1.d4 Nf6 2.c4 e6 3.Nf3 d5 4.Nc3 Be7 5.Bg5 0-0 6.e3 Nbd7 7.Bd3

• D61 QGD, Orthodox Defence, Rubinstein Variation
• Queen's Gambit Declined: Orthodox Defense, Rubinstein Variation: 1.d4 Nf6 2.c4 e6 3.Nf3 d5 4.Nc3 Be7 5.Bg5 0-0 6.e3 Nbd7 7.Qc2

• D62 QGD, Orthodox Defence, 7.Qc2 c5, 8.cxd5 (Rubinstein)
• Queen's Gambit Declined: Orthodox Defense, Rubinstein Variation, Flohr Line: 1.d4 Nf6 2.c4 e6 3.Nf3 d5 4.Nc3 Be7 5.Bg5 0-0 6.e3 Nbd7 7.Qc2 c5 8.cxd5

• D63 QGD, Orthodox Defence, 7.Rc1
• Queen's Gambit Declined: Orthodox Defense, Pillsbury Variation: 1.d4 Nf6 2.c4 e6 3.Nc3 d5 4.Bg5 Be7 5.e3 0-0 6.Nf3 Nbd7 7.Rc1 b6 8.cxd5 exd5 9.Bd3
• Queen's Gambit Declined: Orthodox Defense, Main Line: 1.d4 Nf6 2.c4 e6 3.Nf3 d5 4.Nc3 Be7 5.Bg5 0-0 6.e3 Nbd7 7.Rc1
• Queen's Gambit Declined: Orthodox Defense, Henneberger Variation: 1.d4 Nf6 2.c4 e6 3.Nf3 d5 4.Nc3 Be7 5.Bg5 0-0 6.e3 Nbd7 7.Rc1 a6
• Queen's Gambit Declined: Orthodox Defense, Swiss, Carlsbad Variation: 1.d4 Nf6 2.c4 e6 3.Nf3 d5 4.Nc3 Be7 5.Bg5 0-0 6.e3 Nbd7 7.Rc1 a6 8.cxd5
• Queen's Gambit Declined: Orthodox Defense, Main Line: 1.d4 Nf6 2.c4 e6 3.Nf3 d5 4.Nc3 Be7 5.Bg5 0-0 6.e3 Nbd7 7.Rc1 c6
• Queen's Gambit Declined: Orthodox Defense, Capablanca Variation: 1.Nf3 d5 2.d4 Nf6 3.c4 e6 4.Nc3 Be7 5.Bg5 0-0 6.e3 Nbd7 7.Rc1 b6 8.cxd5 exd5 9.Bb5

• D64 QGD, Orthodox Defence, Rubinstein Attack (with Rc1)
• Queen's Gambit Declined: Orthodox Defense, Rubinstein Attack: 1.d4 Nf6 2.c4 e6 3.Nc3 d5 4.Nf3 Be7 5.Bg5 0-0 6.e3 Nbd7 7.Rc1 c6 8.a3 a6 9.Qc2
• Queen's Gambit Declined: Orthodox Defense, Rubinstein Attack: 1.d4 Nf6 2.c4 e6 3.Nf3 d5 4.Nc3 Be7 5.Bg5 0-0 6.e3 Nbd7 7.Rc1 c6 8.Qc2
• Queen's Gambit Declined: Orthodox Defense, Rubinstein Attack: 1.d4 Nf6 2.c4 e6 3.Nf3 d5 4.Nc3 Be7 5.Bg5 0-0 6.e3 Nbd7 7.Rc1 c6 8.Qc2 a6
• Queen's Gambit Declined: Orthodox Defense, Rubinstein Attack: 1.Nf3 d5 2.d4 Nf6 3.c4 e6 4.Nc3 Be7 5.Bg5 0-0 6.e3 Nbd7 7.Rc1 c6 8.Qc2 Ne4

• D65 QGD, Orthodox Defence, Rubinstein Attack, Main line
• Queen's Gambit Declined: Orthodox Defense, Rubinstein Attack: 1.d4 d5 2.Nf3 Nf6 3.c4 e6 4.Nc3 Be7 5.Bg5 0-0 6.e3 Nbd7 7.Rc1 c6 8.Qc2 a6 9.cxd5

• D66 QGD, Orthodox Defence, Bd3 line including Rubinstein Trap
• Queen's Gambit Declined: Orthodox Defense, Bd3 Line: 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Bg5 Be7 5.e3 0-0 6.Nf3 Nbd7 7.Rc1 c6 8.Bd3
• Queen's Gambit Declined: Orthodox Defense, Fianchetto Variation: 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Bg5 c6 5.Nf3 Be7 6.e3 Nbd7 7.Rc1 0-0 8.Bd3 dxc4 9.Bxc4 b5

• D67 QGD, Orthodox Defence, Bd3 line, Capablanca freeing manoeuvre
• Queen's Gambit Declined: Orthodox Defense, Capablanca System: 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Bg5 Be7 5.e3 0-0 6.Nf3 Nbd7 7.Rc1 c6 8.Bd3 dxc4 9.Bxc4 Nd5
• Queen's Gambit Declined: Orthodox Defense, Bd3 Line: 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Bg5 Be7 5.e3 0-0 6.Nf3 Nbd7 7.Rc1 c6 8.Bd3 dxc4 9.Bxc4 Nd5 10.Bxe7 Qxe7
• Queen's Gambit Declined: Orthodox Defense, Alekhine Variation: 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Bg5 Be7 5.e3 0-0 6.Nf3 Nbd7 7.Rc1 c6 8.Bd3 dxc4 9.Bxc4 Nd5 10.Bxe7 Qxe7 11.Ne4
• Queen's Gambit Declined: Orthodox Defense, Main Line: 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Bg5 Be7 5.e3 0-0 6.Nf3 Nbd7 7.Rc1 c6 8.Bd3 dxc4 9.Bxc4 Nd5 10.Bxe7 Qxe7 11.0-0
• Queen's Gambit Declined: Orthodox Defense, Janowski Variation: 1.d4 d5 2.Nf3 Nf6 3.c4 e6 4.Nc3 Be7 5.Bg5 0-0 6.e3 Nbd7 7.Rc1 c6 8.Bd3 dxc4 9.Bxc4 Nd5 10.h4

• D68 QGD, Orthodox Defence, Classical Variation
• Queen's Gambit Declined: Orthodox Defense, Classical Variation: 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Bg5 Be7 5.e3 0-0 6.Nf3 Nbd7 7.Rc1 c6 8.Bd3 dxc4 9.Bxc4 Nd5 10.Bxe7 Qxe7 11.0-0 Nxc3 12.Rxc3 e5
• Queen's Gambit Declined: Orthodox Defense, Classical Variation: 1.d4 d5 2.c4 e6 3.Nf3 Nf6 4.Nc3 Be7 5.Bg5 0-0 6.e3 Nbd7 7.Rc1 c6 8.Bd3 dxc4 9.Bxc4 Nd5 10.Bxe7 Qxe7 11.0-0 Nxc3 12.Rxc3 e5 13.Qb1
• Queen's Gambit Declined: Orthodox Defense, Classical Variation: 1.d4 Nf6 2.c4 e6 3.Nf3 d5 4.Nc3 Be7 5.Bg5 0-0 6.e3 Nbd7 7.Rc1 c6 8.Bd3 dxc4 9.Bxc4 Nd5 10.Bxe7 Qxe7 11.0-0 Nxc3 12.Rxc3 e5 13.Qc2

• D69 QGD, Orthodox Defence, Classical, 13.dxe5
• Queen's Gambit Declined: Orthodox Defense, Classical Variation: 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Bg5 Be7 5.e3 0-0 6.Nf3 Nbd7 7.Rc1 c6 8.Bd3 dxc4 9.Bxc4 Nd5 10.Bxe7 Qxe7 11.0-0 Nxc3 12.Rxc3 e5 13.dxe5 Nxe5 14.Nxe5 Qxe5

1.d4 Nf6 2.c4 g6 with 3...d5: Grünfeld Defence

• D70 Neo-Grünfeld Defence
• Neo-Grünfeld Defense: Goglidze Attack: 1.d4 Nf6 2.c4 g6 3.f3 d5
• Neo-Grünfeld Defense: with g3: 1.d4 Nf6 2.c4 g6 3.g3 d5
• Neo-Grünfeld Defense: with Nf3: 1.d4 Nf6 2.c4 g6 3.Nf3 d5

• D71 Neo-Grünfeld, 5.cxd5
• Neo-Grünfeld Defense: Exchange Variation: 1.d4 Nf6 2.c4 g6 3.g3 Bg7 4.Bg2 d5 5.cxd5 Nxd5

• D72 Neo-Grünfeld, 5.cxd5, Main line
• 1.d4 Nf6 2.c4 g6 3.g3 d5 4.Bg2 Bg7 5.cxd5

• D73 Neo-Grünfeld, 5.Nf3
• 1.d4 Nf6 2.c4 g6 3.g3 d5 4.Bg2 Bg7 5.Nf3

• D74 Neo-Grünfeld, 6.cxd5 Nxd5, 7.0-0
• Neo-Grünfeld Defense: Delayed Exchange Variation: 1.d4 Nf6 2.c4 g6 3.Nf3 Bg7 4.g3 0-0 5.Bg2 d5 6.cxd5 Nxd5 7.0-0

• D75 Neo-Grünfeld, 6.cxd5 Nxd5, 7.0-0 c5, 8.Nc3
• Neo-Grünfeld Defense: Delayed Exchange Variation: 1.d4 Nf6 2.c4 g6 3.Nc3 Bg7 4.Nf3 0-0 5.g3 d5 6.cxd5 Nxd5 7.Bg2 c5 8.0-0
• Neo-Grünfeld Defense: Delayed Exchange Variation: 1.d4 Nf6 2.Nf3 g6 3.c4 Bg7 4.g3 0-0 5.Bg2 d5 6.cxd5 Nxd5 7.0-0 c5 8.dxc5

• D76 Neo-Grünfeld, 6.cxd5 Nxd5, 7.0-0 Nb6
• Neo-Grünfeld Defense: Delayed Exchange Variation: 1.d4 Nf6 2.c4 g6 3.Nf3 Bg7 4.g3 0-0 5.Bg2 d5 6.cxd5 Nxd5 7.0-0 Nb6

• D77 Neo-Grünfeld, 6.0-0
• Neo-Grünfeld Defense: Classical Variation: 1.d4 Nf6 2.Nf3 g6 3.g3 Bg7 4.Bg2 0-0 5.0-0 d5 6.c4
• Neo-Grünfeld Defense: Classical Variation, Modern Defense: 1.d4 Nf6 2.Nf3 g6 3.g3 Bg7 4.Bg2 0-0 5.0-0 d5 6.c4 dxc4
• Neo-Grünfeld Defense: Classical Variation, Polgar Variation: 1.d4 Nf6 2.Nf3 g6 3.g3 Bg7 4.Bg2 0-0 5.0-0 d5 6.c4 Nc6

• D78 Neo-Grünfeld, 6.0-0 c6
• Neo-Grünfeld Defense: Classical Variation, Original Defense: 1.d4 Nf6 2.c4 g6 3.Nf3 Bg7 4.g3 0-0 5.Bg2 c6 6.0-0 d5

• D79 Neo-Grünfeld, 6.0-0, Main line
• Neo-Grünfeld Defense: Ultra-Delayed Exchange Variation: 1.d4 Nf6 2.c4 g6 3.Nf3 Bg7 4.g3 0-0 5.Bg2 c6 6.0-0 d5 7.cxd5 cxd5

• D80 Grünfeld Defence
• Grünfeld Defense: 1.d4 Nf6 2.c4 g6 3.Nc3 d5
• Grünfeld Defense: Stockholm Variation: 1.d4 Nf6 2.c4 g6 3.Nc3 d5 4.Bg5
• Grünfeld Defense: Lundin Variation: 1.d4 Nf6 2.c4 g6 3.Nc3 d5 4.Bg5 Ne4 5.Nxe4 dxe4 6.Qd2 c5
• Grünfeld Defense: Lutikov Variation: 1.d4 Nf6 2.c4 g6 3.Nc3 d5 4.f3
• Grünfeld Defense: Lutikov Variation, Murrey Attack: 1.d4 Nf6 2.c4 g6 3.Nc3 d5 4.f3 c5 5.cxd5 Nxd5 6.Na4
• Grünfeld Defense: Gibbon Gambit: 1.d4 Nf6 2.c4 g6 3.Nc3 d5 4.g4
• Grünfeld Defense: Zaitsev Gambit: 1.d4 Nf6 2.c4 g6 3.Nc3 d5 4.h4

• D81 Grünfeld, Russian Variation
• Grünfeld Defense: Russian Variation, Accelerated Variation: 1.d4 Nf6 2.c4 g6 3.Nc3 d5 4.Qb3

• D82 Grünfeld, 4.Bf4
• Grünfeld Defense: Brinckmann Attack: 1.d4 Nf6 2.c4 g6 3.Nc3 d5 4.Bf4

• D83 Grünfeld Gambit
• Grünfeld Defense: Brinckmann Attack, Grünfeld Gambit: 1.d4 Nf6 2.c4 g6 3.Nc3 d5 4.Bf4 Bg7 5.e3 0-0
• Grünfeld Defense: Brinckmann Attack, Grünfeld Gambit, Capablanca Variation: 1.d4 Nf6 2.c4 g6 3.Nc3 d5 4.Bf4 Bg7 5.e3 0-0 6.Rc1
• Grünfeld Defense: Brinckmann Attack, Grünfeld Gambit, Botvinnik Variation: 1.d4 Nf6 2.c4 g6 3.Nc3 d5 4.Bf4 Bg7 5.e3 0-0 6.Rc1 c5 7.dxc5 Be6
• Grünfeld Defense: Brinckmann Attack, Reshevsky Gambit: 1.d4 Nf6 2.c4 g6 3.Nc3 d5 4.Bf4 Bg7 5.Rc1 0-0 6.e3 c5 7.dxc5 Qa5

• D84 Grünfeld Gambit Accepted
• Grünfeld Defense: Brinckmann Attack, Grünfeld Gambit Accepted: 1.d4 Nf6 2.c4 g6 3.Nc3 d5 4.Bf4 Bg7 5.e3 0-0 6.cxd5 Nxd5 7.Nxd5 Qxd5 8.Bxc7

• D85 Grünfeld, Nadanian Variation
• Grünfeld Defense: Exchange Variation: 1.d4 Nf6 2.c4 g6 3.Nc3 d5 4.cxd5 Nxd5
• Grünfeld Defense: Exchange Variation, Modern Exchange Variation: 1.d4 Nf6 2.c4 g6 3.Nc3 d5 4.cxd5 Nxd5 5.e4 Nxc3 6.bxc3 Bg7 7.Nf3
• Grünfeld Defense: Exchange Variation, Modern Exchange Variation: 1.d4 Nf6 2.c4 g6 3.Nc3 d5 4.cxd5 Nxd5 5.e4 Nxc3 6.bxc3 Bg7 7.Nf3 c5
• Grünfeld Defense: Exchange Variation, Modern Exchange Variation, Pawn Grab Line: 1.d4 Nf6 2.c4 g6 3.Nc3 d5 4.cxd5 Nxd5 5.e4 Nxc3 6.bxc3 Bg7 7.Nf3 c5 8.Rb1 0-0 9.Be2 Nc6 10.d5 Bxc3+
• Grünfeld Defense: Exchange Variation, Nadanian Attack: 1.d4 Nf6 2.c4 g6 3.Nc3 d5 4.cxd5 Nxd5 5.Na4
• Grünfeld Defense: Exchange Variation, Modern Exchange Variation, Kramnik's Line: 1.d4 Nf6 2.Nf3 g6 3.c4 Bg7 4.Nc3 d5 5.cxd5 Nxd5 6.e4 Nxc3 7.bxc3 c5 8.h3
• Grünfeld Defense: Exchange Variation, Modern Exchange Variation: 1.d4 Nf6 2.Nf3 g6 3.c4 Bg7 4.Nc3 d5 5.cxd5 Nxd5 6.e4 Nxc3 7.bxc3 c5 8.Rb1

• D86 Grünfeld, Exchange, Classical Variation
• Grünfeld Defense: Exchange Variation, Classical Variation: 1.d4 Nf6 2.c4 g6 3.Nc3 d5 4.cxd5 Nxd5 5.e4 Nxc3 6.bxc3 Bg7 7.Bc4
• Grünfeld Defense: Exchange Variation, Simagin's Lesser Variation: 1.d4 Nf6 2.c4 g6 3.Nc3 d5 4.cxd5 Nxd5 5.e4 Nxc3 6.bxc3 Bg7 7.Bc4 0-0 8.Ne2 b6
• Grünfeld Defense: Exchange Variation, Simagin's Improved Variation: 1.d4 Nf6 2.c4 g6 3.Nc3 d5 4.cxd5 Nxd5 5.e4 Nxc3 6.bxc3 Bg7 7.Bc4 0-0 8.Ne2 Nc6
• Grünfeld Defense: Exchange Variation, Larsen Variation: 1.d4 Nf6 2.c4 g6 3.Nc3 d5 4.cxd5 Nxd5 5.e4 Nxc3 6.bxc3 Bg7 7.Bc4 0-0 8.Ne2 Qd7
• Grünfeld Defense: Exchange Variation, Larsen Variation: 1.d4 Nf6 2.c4 g6 3.Nc3 d5 4.cxd5 Nxd5 5.e4 Nxc3 6.bxc3 Bg7 7.Bc4 0-0 8.Ne2 Qd7 9.0-0 b6

• D87 Grünfeld, Exchange, Spassky Variation
• Grünfeld Defense: Exchange Variation, Seville Variation: 1.d4 Nf6 2.c4 g6 3.Nc3 d5 4.cxd5 Nxd5 5.e4 Nxc3 6.bxc3 Bg7 7.Bc4 c5 8.Ne2 Nc6 9.Be3 0-0 10.0-0 Bg4 11.f3 Na5 12.Bxf7+
• Grünfeld Defense: Exchange Variation, Spassky Variation: 1.d4 Nf6 2.c4 g6 3.Nc3 d5 4.cxd5 Nxd5 5.e4 Nxc3 6.bxc3 Bg7 7.Bc4 c5 8.Ne2 0-0

• D88 Grünfeld, Spassky Variation, Main line, 10...cxd4, 11.cxd4
• Grünfeld Defense: Exchange Variation, Spassky Variation: 1.d4 Nf6 2.c4 g6 3.Nc3 d5 4.cxd5 Nxd5 5.e4 Nxc3 6.bxc3 Bg7 7.Bc4 c5 8.Ne2 Nc6 9.Be3 0-0 10.0-0 cxd4 11.cxd4

• D89 Grünfeld, Spassky Variation, Main line, 13.Bd3
• Grünfeld Defense: Exchange Variation, Spassky Variation: 1.d4 Nf6 2.c4 g6 3.Nc3 d5 4.cxd5 Nxd5 5.e4 Nxc3 6.bxc3 Bg7 7.Bc4 c5 8.Ne2 Nc6 9.Be3 0-0 10.0-0 Bg4 11.f3 Na5 12.Bd3 cxd4 13.cxd4 Be6
• Grünfeld Defense: Exchange Variation, Sokolsky Variation: 1.d4 Nf6 2.c4 g6 3.Nc3 d5 4.cxd5 Nxd5 5.e4 Nxc3 6.bxc3 Bg7 7.Bc4 c5 8.Ne2 0-0 9.0-0 Nc6 10.Be3 Bg4 11.f3 Na5 12.Bd3 cxd4 13.cxd4 Be6 14.d5

• D90 Grünfeld, Three Knights Variation
• Grünfeld Defense: Three Knights Variation: 1.d4 Nf6 2.c4 g6 3.Nc3 d5 4.Nf3
• Grünfeld Defense: Three Knights Variation: 1.d4 Nf6 2.c4 g6 3.Nc3 d5 4.Nf3 Bg7
• Grünfeld Defense: Flohr Variation: 1.d4 Nf6 2.c4 g6 3.Nc3 d5 4.Nf3 Bg7 5.Qa4+

• D91 Grünfeld, Three Knights Variation
• Grünfeld Defense: Three Knights Variation, Petrosian System: 1.d4 Nf6 2.c4 g6 3.Nc3 d5 4.Nf3 Bg7 5.Bg5

• D92 Grünfeld, 5.Bf4
• Grünfeld Defense: Three Knights Variation, Hungarian Attack: 1.d4 Nf6 2.c4 g6 3.Nc3 d5 4.Nf3 Bg7 5.Bf4

• D93 Grünfeld with 5.Bf4 0-0 6.e3
• Grünfeld Defense: Three Knights Variation, Hungarian Variation: 1.d4 Nf6 2.c4 g6 3.Nc3 d5 4.Nf3 Bg7 5.Bf4 0-0 6.e3

• D94 Grünfeld, 5.e3
• Grünfeld Defense: Flohr Defense: 1.d4 d5 2.c4 c6 3.Nc3 Nf6 4.e3 g6 5.Nf3 Bg7 6.Bd3 0-0 7.0-0 Bf5
• Grünfeld Defense: Smyslov Defense: 1.d4 d5 2.c4 c6 3.Nc3 Nf6 4.e3 g6 5.Nf3 Bg7 6.Bd3 0-0 7.0-0 Bg4
• Grünfeld Defense: Three Knights Variation, Burille Variation: 1.d4 Nf6 2.c4 g6 3.Nc3 d5 4.Nf3 Bg7 5.e3
• Grünfeld Defense: Makogonov Variation: 1.d4 Nf6 2.c4 g6 3.Nc3 d5 4.Nf3 Bg7 5.e3 0-0 6.b4
• Grünfeld Defense: Opocensky Variation: 1.d4 Nf6 2.c4 g6 3.Nc3 d5 4.Nf3 Bg7 5.e3 0-0 6.Bd2
• Grünfeld Defense: Three Knights Variation, Paris Variation: 1.d4 Nf6 2.c4 g6 3.Nc3 d5 4.Nf3 Bg7 5.e3 0-0 6.Bd3

• D95 Grünfeld with 5.e3 0-0 6.Qb3
• Grünfeld Defense: Pachman Variation: 1.d4 Nf6 2.c4 g6 3.Nc3 d5 4.e3 Bg7 5.Qb3 dxc4 6.Bxc4 0-0 7.Nf3 Nbd7 8.Ng5
• Grünfeld Defense: Three Knights Variation, Vienna Variation: 1.d4 Nf6 2.c4 g6 3.Nc3 d5 4.Nf3 Bg7 5.e3 0-0 6.Qb3
• Grünfeld Defense: Botvinnik Variation: 1.d4 Nf6 2.c4 g6 3.Nc3 d5 4.Nf3 Bg7 5.e3 0-0 6.Qb3 e6

• D96 Grünfeld, Russian Variation
• Grünfeld Defense: Russian Variation: 1.d4 Nf6 2.c4 g6 3.Nc3 d5 4.Nf3 Bg7 5.Qb3

• D97 Grünfeld, Russian Variation with 7.e4
• Grünfeld Defense: Russian Variation: 1.d4 Nf6 2.c4 g6 3.Nc3 d5 4.Nf3 Bg7 5.Qb3 dxc4 6.Qxc4 0-0 7.e4
• Grünfeld Defense: Russian Variation, Hungarian Variation: 1.d4 Nf6 2.c4 g6 3.Nc3 d5 4.Nf3 Bg7 5.Qb3 dxc4 6.Qxc4 0-0 7.e4 a6
• Grünfeld Defense: Russian Variation, Levenfish Variation: 1.d4 Nf6 2.c4 g6 3.Nc3 d5 4.Nf3 Bg7 5.Qb3 dxc4 6.Qxc4 0-0 7.e4 b6
• Grünfeld Defense: Russian Variation, Szabo Variation: 1.d4 Nf6 2.c4 g6 3.Nc3 d5 4.Nf3 Bg7 5.Qb3 dxc4 6.Qxc4 0-0 7.e4 c6
• Grünfeld Defense: Russian Variation, Prins Variation: 1.d4 Nf6 2.c4 g6 3.Nc3 d5 4.Nf3 Bg7 5.Qb3 dxc4 6.Qxc4 0-0 7.e4 Na6
• Grünfeld Defense: Russian Variation, Byrne Variation: 1.d4 Nf6 2.c4 g6 3.Nc3 d5 4.Nf3 Bg7 5.Qb3 dxc4 6.Qxc4 0-0 7.e4 Nc6

• D98 Grünfeld, Russian, Smyslov Variation
• Grünfeld Defense: Russian Variation, Smyslov Variation: 1.d4 Nf6 2.c4 g6 3.Nc3 d5 4.Nf3 Bg7 5.Qb3 dxc4 6.Qxc4 0-0 7.e4 Bg4
• Grünfeld Defense: Russian Variation, Keres Variation: 1.d4 Nf6 2.c4 g6 3.Nc3 d5 4.Nf3 Bg7 5.Qb3 dxc4 6.Qxc4 0-0 7.e4 Bg4 8.Be3 Nfd7 9.Be2 Nb6 10.Qd3 Nc6 11.0-0-0

• D99 Grünfeld Defence, Smyslov, Main line
• Grünfeld Defense: Russian Variation, Smyslov Variation: 1.d4 Nf6 2.c4 g6 3.Nc3 d5 4.Nf3 Bg7 5.Qb3 dxc4 6.Qxc4 0-0 7.e4 Bg4 8.Be3 Nfd7 9.Qb3
• Grünfeld Defense: Russian Variation, Yugoslav Variation: 1.d4 Nf6 2.c4 g6 3.Nc3 d5 4.Nf3 Bg7 5.Qb3 dxc4 6.Qxc4 0-0 7.e4 Bg4 8.Be3 Nfd7 9.Qb3 c5

• 1.d4 Nf6 2.c4 e6: Indian systems with ...e6 (E00–E59)
• 1.d4 Nf6 2.c4 g6 without 3...d5: Indian systems with ...g6 (except Grünfeld) (E60–E99)

1.d4 Nf6 2.c4 e6: Indian systems with ...e6

• E00 Queen's Pawn Game (including Neo-Indian Attack, Trompowsky Attack, Catalan Opening and others)
• Indian Defense: Seirawan Attack: 1.d4 Nf6 2.c4 e6 3.Bg5
• Catalan Opening: 1.d4 Nf6 2.c4 e6 3.g3
• Catalan Opening: 1.d4 Nf6 2.c4 e6 3.g3 d5
• Catalan Opening: Hungarian Gambit: 1.d4 Nf6 2.c4 e6 3.g3 e5
• Indian Defense: Devin Gambit: 1.d4 Nf6 2.c4 e6 3.g4
• Indian Defense: 1.d4 Nf6 2.c4 e6 3.Qb3

• E01 Catalan, Closed
• Catalan Opening: Closed: 1.d4 Nf6 2.c4 e6 3.g3 d5 4.Bg2

• E02 Catalan, Open, 5.Qa4
• Catalan Opening: Open Defense: 1.d4 Nf6 2.c4 e6 3.g3 d5 4.Bg2 dxc4

• E03 Catalan, Open, Alekhine Variation
• Catalan Opening: Open Defense: 1.d4 Nf6 2.c4 e6 3.g3 d5 4.Bg2 dxc4 5.Qa4+ Nbd7 6.Qxc4
• Catalan Opening: Open Defense, Alekhine Variation: 1.d4 Nf6 2.c4 e6 3.g3 d5 4.Bg2 dxc4 5.Qa4+ Nbd7 6.Qxc4 a6 7.Qc2

• E04 Catalan, Open, 5.Nf3
• Catalan Opening: Open Defense: 1.d4 Nf6 2.c4 e6 3.g3 d5 4.Bg2 dxc4 5.Nf3
• Catalan Opening: Open Defense, Modern Sharp Variation: 1.d4 Nf6 2.c4 e6 3.g3 d5 4.Bg2 dxc4 5.Nf3 Nc6 6.Qa4 Bb4+

• E05 Catalan, Open, Classical line
• Catalan Opening: Open Defense, Classical Line: 1.d4 Nf6 2.c4 e6 3.g3 d5 4.Bg2 dxc4 5.Nf3 Be7
• Catalan Opening: Open Defense, Classical Line: 1.d4 Nf6 2.c4 e6 3.Nf3 d5 4.g3 Be7 5.Bg2 0-0 6.0-0 dxc4

• E06 Catalan, Closed, 5.Nf3
• Catalan Opening: Closed: 1.d4 Nf6 2.c4 e6 3.g3 d5 4.Bg2 Be7 5.Nf3
• Catalan Opening: Closed: 1.d4 Nf6 2.c4 e6 3.g3 d5 4.Bg2 Be7 5.Nf3 0-0 6.0-0 c6 7.Qc2 b6 8.Nbd2 Bb7 9.e4 Na6
• Catalan Opening: Closed: 1.d4 Nf6 2.c4 e6 3.Nf3 d5 4.g3 Bb4+ 5.Bd2 Be7 6.Bg2 0-0 7.0-0 c6 8.Bf4 b6

• E07 Catalan, Closed, 6...Nbd7
• Catalan Opening: Closed: 1.d4 Nf6 2.c4 e6 3.g3 d5 4.Bg2 Be7 5.Nf3 0-0 6.0-0 Nbd7
• Catalan Opening: Closed, Botvinnik Variation: 1.d4 Nf6 2.c4 e6 3.g3 d5 4.Bg2 Be7 5.Nf3 0-0 6.0-0 Nbd7 7.Nc3 c6 8.Qd3

• E08 Catalan, Closed, 7.Qc2
• Catalan Opening: Closed, Zagoryansky Variation: 1.d4 e6 2.c4 Nf6 3.Nf3 d5 4.g3 Be7 5.Bg2 0-0 6.0-0 Nbd7 7.Qc2 c6 8.Rd1 b6 9.a4
• Catalan Opening: Closed, Spassky Gambit: 1.d4 Nf6 2.c4 e6 3.g3 Be7 4.Bg2 d5 5.Nf3 0-0 6.0-0 Nbd7 7.Qc2 c6 8.b3 b6 9.Rd1 Bb7 10.Nc3 b5
• Catalan Opening: Closed: 1.d4 Nf6 2.c4 e6 3.g3 d5 4.Bg2 Be7 5.Nf3 0-0 6.0-0 c6 7.Qc2 b6 8.Rd1 Nbd7 9.Bf4
• Catalan Opening: Closed: 1.d4 Nf6 2.c4 e6 3.g3 d5 4.Bg2 Be7 5.Nf3 0-0 6.0-0 Nbd7 7.Qc2
• Catalan Opening: Closed: 1.d4 Nf6 2.c4 e6 3.g3 d5 4.Bg2 Be7 5.Nf3 0-0 6.0-0 Nbd7 7.Qc2 c6 8.b3
• Catalan Opening: Closed: 1.d4 Nf6 2.c4 e6 3.g3 d5 4.Bg2 Be7 5.Nf3 0-0 6.0-0 Nbd7 7.Qc2 c6 8.b3 b6
• Catalan Opening: Closed: 1.d4 Nf6 2.c4 e6 3.g3 d5 4.Bg2 Be7 5.Nf3 0-0 6.0-0 Nbd7 7.Qc2 c6 8.Bf4 b6 9.Nbd2 Bb7 10.e4

• E09 Catalan, Closed, Main line
• Catalan Opening: Closed Variation, Rabinovich Variation: 1.d4 d5 2.c4 c6 3.Nf3 Nf6 4.Qc2 e6 5.Nbd2 Be7 6.g3 Nbd7 7.Bg2 0-0 8.0-0 b5
• Catalan Opening: Closed, Sokolsky Variation: 1.d4 Nf6 2.c4 e6 3.g3 d5 4.Bg2 Be7 5.Nf3 0-0 6.0-0 Nbd7 7.Qc2 c6 8.Nbd2 b6 9.b3 a5 10.Bb2 Ba6
• Catalan Opening: Closed, Main Line: 1.d4 Nf6 2.c4 e6 3.Nf3 d5 4.g3 Be7 5.Bg2 0-0 6.0-0 c6 7.Qc2 b6 8.Nbd2 Bb7 9.e4 Nbd7
• Catalan Opening: Closed, Main Line: 1.d4 Nf6 2.c4 e6 3.Nf3 d5 4.g3 Be7 5.Bg2 0-0 6.0-0 Nbd7 7.Qc2 c6 8.Bf4 b6 9.Nbd2 Bb7 10.e4 dxe4 11.Nxe4 Nxe4 12.Qxe4
• Catalan Opening: Closed, Main Line: 1.d4 Nf6 2.c4 e6 3.Nf3 d5 4.g3 Be7 5.Bg2 0-0 6.0-0 Nbd7 7.Qc2 c6 8.Nbd2
• Catalan Opening: Closed Variation, Traditional Variation: 1.d4 Nf6 2.c4 e6 3.Nf3 d5 4.g3 Be7 5.Bg2 0-0 6.0-0 Nbd7 7.Qc2 c6 8.Nbd2 b6

• E10 Queen's Pawn Game 3.Nf3
• Indian Defense: Anti-Nimzo-Indian: 1.d4 Nf6 2.c4 e6 3.Nf3
• Indian Defense: Dzindzi-Indian Defense: 1.d4 Nf6 2.c4 e6 3.Nf3 a6
• Blumenfeld Countergambit: 1.d4 Nf6 2.c4 e6 3.Nf3 c5 4.d5 b5
• Blumenfeld Countergambit: Duz-Khotimirsky Variation: 1.d4 Nf6 2.c4 e6 3.Nf3 c5 4.d5 b5 5.Bg5
• Blumenfeld Countergambit: Spielmann Variation: 1.d4 Nf6 2.c4 e6 3.Nf3 c5 4.d5 b5 5.Bg5 exd5 6.cxd5 h6
• Blumenfeld Countergambit Accepted: 1.d4 Nf6 2.c4 e6 3.Nf3 c5 4.d5 b5 5.dxe6 fxe6 6.cxb5 d5
• Indian Defense: Döry Indian: 1.d4 Nf6 2.c4 e6 3.Nf3 Ne4

• E11 Bogo-Indian Defence
• Bogo-Indian Defense: Retreat Variation: 1.d4 Nf6 2.c4 e6 3.g3 Bb4+ 4.Bd2 Be7 5.Bg2 d5 6.Nf3
• Bogo-Indian Defense: Retreat Variation: 1.d4 Nf6 2.c4 e6 3.g3 Bb4+ 4.Bd2 Be7 5.Bg2 d5 6.Nf3 Nbd7 7.0-0 0-0 8.Qc2 c6
• Bogo-Indian Defense: Retreat Variation: 1.d4 Nf6 2.c4 e6 3.g3 Bb4+ 4.Bd2 Be7 5.Bg2 d5 6.Nf3 0-0
• Bogo-Indian Defense: Retreat Variation: 1.d4 Nf6 2.c4 e6 3.g3 Bb4+ 4.Bd2 Be7 5.Bg2 d5 6.Nf3 0-0 7.0-0
• Bogo-Indian Defense: Retreat Variation: 1.d4 Nf6 2.c4 e6 3.g3 Bb4+ 4.Bd2 Be7 5.Bg2 d5 6.Nf3 0-0 7.Qc2 c6 8.0-0
• Bogo-Indian Defense: Monticelli Trap: 1.d4 Nf6 2.c4 e6 3.Nf3 b6 4.g3 Bb7 5.Bg2 Bb4+ 6.Bd2 Bxd2+ 7.Qxd2 0-0 8.Nc3 Ne4 9.Qc2 Nxc3 10.Ng5
• Bogo-Indian Defense: 1.d4 Nf6 2.c4 e6 3.Nf3 Bb4+
• Bogo-Indian Defense: Wade-Smyslov Variation: 1.d4 Nf6 2.c4 e6 3.Nf3 Bb4+ 4.Bd2 a5
• Bogo-Indian Defense: Retreat Variation: 1.d4 Nf6 2.c4 e6 3.Nf3 Bb4+ 4.Bd2 Be7
• Bogo-Indian Defense: Exchange Variation: 1.d4 Nf6 2.c4 e6 3.Nf3 Bb4+ 4.Bd2 Bxd2+
• Bogo-Indian Defense: Vitolins Variation: 1.d4 Nf6 2.c4 e6 3.Nf3 Bb4+ 4.Bd2 c5
• Bogo-Indian Defense: Haiti Variation: 1.d4 Nf6 2.c4 e6 3.Nf3 Bb4+ 4.Bd2 Nc6
• Bogo-Indian Defense: Nimzowitsch Variation: 1.d4 Nf6 2.c4 e6 3.Nf3 Bb4+ 4.Bd2 Qe7
• Bogo-Indian Defense: Grünfeld Variation: 1.d4 Nf6 2.c4 e6 3.Nf3 Bb4+ 4.Nbd2
• Bogo-Indian Defense: New England Variation: 1.d4 Nf6 2.c4 e6 3.Nf3 Bb4+ 4.Nfd2
• Bogo-Indian Defense: Retreat Variation: 1.d4 Nf6 2.c4 e6 3.Nf3 d5 4.g3 Bb4+ 5.Bd2 Be7 6.Bg2 0-0 7.0-0 c6 8.Qc2 Nbd7 9.Bf4 b6 10.Nbd2
• Bogo-Indian Defense: Retreat Variation: 1.d4 Nf6 2.c4 e6 3.Nf3 d5 4.g3 Bb4+ 5.Bd2 Be7 6.Bg2 0-0 7.0-0 c6 8.Qc2 Nbd7 9.Bf4 b6 10.Nbd2 Ba6

• E12 Queen's Indian Defence
• Queen's Indian Defense: 1.d4 Nf6 2.c4 e6 3.Nf3 b6
• Queen's Indian Defense: Petrosian Variation: 1.d4 Nf6 2.c4 e6 3.Nf3 b6 4.a3
• Queen's Indian Defense: Petrosian Variation, Farago Defense: 1.d4 Nf6 2.c4 e6 3.Nf3 b6 4.a3 Ba6 5.Qc2 Bb7
• Queen's Indian Defense: Kasparov-Petrosian Variation: 1.d4 Nf6 2.c4 e6 3.Nf3 b6 4.a3 Bb7 5.Nc3
• Queen's Indian Defense: Kasparov-Petrosian Variation, Marco Defense: 1.d4 Nf6 2.c4 e6 3.Nf3 b6 4.a3 Bb7 5.Nc3 Be7
• Queen's Indian Defense: Kasparov-Petrosian Variation, Main Line: 1.d4 Nf6 2.c4 e6 3.Nf3 b6 4.a3 Bb7 5.Nc3 d5
• Queen's Indian Defense: Kasparov-Petrosian Variation, Classical Variation: 1.d4 Nf6 2.c4 e6 3.Nf3 b6 4.a3 Bb7 5.Nc3 d5 6.cxd5 exd5
• Queen's Indian Defense: Kasparov-Petrosian Variation, Modern Variation: 1.d4 Nf6 2.c4 e6 3.Nf3 b6 4.a3 Bb7 5.Nc3 d5 6.cxd5 Nxd5
• Queen's Indian Defense: Kasparov-Petrosian Variation, Romanishin Attack: 1.d4 Nf6 2.c4 e6 3.Nf3 b6 4.a3 Bb7 5.Nc3 d5 6.cxd5 Nxd5 7.Bd2
• Queen's Indian Defense: Kasparov-Petrosian Variation, Petrosian Attack: 1.d4 Nf6 2.c4 e6 3.Nf3 b6 4.a3 Bb7 5.Nc3 d5 6.cxd5 Nxd5 7.e3
• Queen's Indian Defense: Kasparov-Petrosian Variation, Rashkovsky Attack: 1.d4 Nf6 2.c4 e6 3.Nf3 b6 4.a3 Bb7 5.Nc3 d5 6.cxd5 Nxd5 7.Qa4+
• Queen's Indian Defense: Kasparov-Petrosian Variation, Kasparov Attack: 1.d4 Nf6 2.c4 e6 3.Nf3 b6 4.a3 Bb7 5.Nc3 d5 6.cxd5 Nxd5 7.Qc2
• Queen's Indian Defense: Kasparov-Petrosian Variation, Hedgehog Variation: 1.d4 Nf6 2.c4 e6 3.Nf3 b6 4.a3 Bb7 5.Nc3 g6
• Queen's Indian Defense: Kasparov-Petrosian Variation, Andersson Variation: 1.d4 Nf6 2.c4 e6 3.Nf3 b6 4.a3 Bb7 5.Nc3 Ne4
• Queen's Indian Defense: Miles Variation: 1.d4 Nf6 2.c4 e6 3.Nf3 b6 4.Bf4
• Queen's Indian Defense: Kasparov Variation: 1.d4 Nf6 2.c4 e6 3.Nf3 b6 4.Nc3
• Nimzo-Indian Defense: Three Knights Variation, Duchamp Variation: 1.d4 Nf6 2.c4 e6 3.Nf3 b6 4.Nc3 Bb4
• Nimzo-Indian Defense: Three Knights Variation, Duchamp Variation, Modern Line: 1.d4 Nf6 2.c4 e6 3.Nf3 b6 4.Nc3 Bb4 5.Bg5 Bb7 6.Nd2
• Queen's Indian Defense: Kasparov-Petrosian Variation, Polovodin Gambit: 1.d4 Nf6 2.c4 e6 3.Nf3 b6 4.Nc3 Bb7 5.a3 d5 6.cxd5 Nxd5 7.e4
• Queen's Indian Defense: Kasparov Variation, Botvinnik Attack: 1.d4 Nf6 2.c4 e6 3.Nf3 b6 4.Nc3 Bb7 5.Bg5 h6 6.Bh4 g5 7.Bg3 Nh5

• E13 Queen's Indian, 4.Nc3, Main line
• Queen's Indian Defense: Kasparov Variation: 1.d4 Nf6 2.c4 e6 3.Nf3 b6 4.Nc3 Bb4 5.Bg5 h6 6.Bh4 Bb7

• E14 Queen's Indian, 4.e3
• Queen's Indian Defense: Spassky System: 1.d4 Nf6 2.c4 e6 3.Nf3 b6 4.e3
• Queen's Indian Defense: Averbakh Variation: 1.d4 Nf6 2.c4 e6 3.Nf3 b6 4.e3 Bb7 5.Bd3 c5 6.0-0 Be7 7.b3 0-0 8.Bb2 cxd4 9.Nxd4

• E15 Queen's Indian, 4.g3
• Queen's Indian Defense: Fianchetto Variation: 1.d4 Nf6 2.c4 e6 3.Nf3 b6 4.g3
• Queen's Indian Defense: Fianchetto Variation, Nimzowitsch Variation: 1.d4 Nf6 2.c4 e6 3.Nf3 b6 4.g3 Ba6
• Queen's Indian Defense: Fianchetto Variation, Nimzowitsch Variation, Quiet Line: 1.d4 Nf6 2.c4 e6 3.Nf3 b6 4.g3 Ba6 5.b3
• Queen's Indian Defense: Fianchetto Variation, Check Variation: 1.d4 Nf6 2.c4 e6 3.Nf3 b6 4.g3 Ba6 5.b3 Bb4+
• Queen's Indian Defense: Fianchetto Variation, Check Variation, Intermezzo Line: 1.d4 Nf6 2.c4 e6 3.Nf3 b6 4.g3 Ba6 5.b3 Bb4+ 6.Bd2 Be7
• Queen's Indian Defense: Fianchetto Variation, Check Variation, Modern Line: 1.d4 Nf6 2.c4 e6 3.Nf3 b6 4.g3 Ba6 5.b3 Bb4+ 6.Bd2 Qe7
• Queen's Indian Defense: Fianchetto Variation, Nimzowitsch Variation, Nimzowitsch Attack: 1.d4 Nf6 2.c4 e6 3.Nf3 b6 4.g3 Ba6 5.Qa4
• Queen's Indian Defense: Fianchetto Variation, Nimzowitsch Variation, Timman's Line: 1.d4 Nf6 2.c4 e6 3.Nf3 b6 4.g3 Ba6 5.Qb3
• Queen's Indian Defense: Fianchetto Variation, Traditional Line: 1.d4 Nf6 2.c4 e6 3.Nf3 b6 4.g3 Bb7
• Queen's Indian Defense: Fianchetto Variation, Sämisch Variation: 1.d4 Nf6 2.c4 e6 3.Nf3 b6 4.g3 Bb7 5.Bg2 c5
• Queen's Indian Defense: Buerger Variation: 1.d4 Nf6 2.c4 e6 3.Nf3 b6 4.g3 Bb7 5.Bg2 c5 6.d5 exd5 7.Ng5
• Queen's Indian Defense: Fianchetto Variation, Rubinstein Variation: 1.d4 Nf6 2.c4 e6 3.Nf3 b6 4.g3 Bb7 5.Bg2 c5 6.d5 exd5 7.Nh4

• E16 Queen's Indian, Capablanca Variation
• Queen's Indian Defense: Capablanca Variation: 1.d4 Nf6 2.c4 e6 3.Nf3 b6 4.g3 Bb7 5.Bg2 Bb4+
• Queen's Indian Defense: Riumin Variation: 1.d4 Nf6 2.c4 e6 3.Nf3 b6 4.g3 Bb7 5.Bg2 Bb4+ 6.Bd2 Be7
• Queen's Indian Defense: Yates Variation: 1.d4 Nf6 2.c4 e6 3.Nf3 Bb4+ 4.Bd2 a5 5.g3 b6 6.Bg2 Bb7

• E17 Queen's Indian, 5.Bg2 Be7
• Queen's Indian Defense: Traditional Variation: 1.d4 Nf6 2.c4 e6 3.Nf3 b6 4.g3 Bb7 5.Bg2 Be7
• Queen's Indian Defense: Anti-Queen's Indian System: 1.d4 Nf6 2.c4 e6 3.Nf3 b6 4.g3 Bb7 5.Bg2 Be7 6.Nc3
• Queen's Indian Defense: Opocensky Variation: 1.d4 Nf6 2.c4 e6 3.Nf3 b6 4.g3 Bb7 5.Bg2 Be7 6.Nc3 Ne4 7.Bd2
• Queen's Indian Defense: Classical Variation: 1.d4 Nf6 2.c4 e6 3.Nf3 b6 4.g3 Bb7 5.Bg2 Be7 6.0-0
• Queen's Indian Defense: Euwe Variation: 1.d4 Nf6 2.c4 e6 3.Nf3 b6 4.g3 Bb7 5.Bg2 Be7 6.0-0 0-0 7.b3
• Queen's Indian Defense: Classical Variation, Taimanov Gambit: 1.d4 Nf6 2.c4 e6 3.Nf3 b6 4.g3 Bb7 5.Bg2 Be7 6.0-0 0-0 7.d5 exd5 8.Nd4
• Queen's Indian Defense: Classical Variation, Polugaevsky Gambit: 1.d4 Nf6 2.c4 e6 3.Nf3 b6 4.g3 Bb7 5.Bg2 Be7 6.0-0 0-0 7.d5 exd5 8.Nh4
• Queen's Indian Defense: Fianchetto Variation, Kramnik Variation: 1.d4 Nf6 2.c4 e6 3.Nf3 b6 4.g3 Bb7 5.Bg2 Be7 6.0-0 0-0 7.Re1

• E18 Queen's Indian, Old Main line, 7.Nc3
• Queen's Indian Defense: Classical Variation, Traditional Variation: 1.d4 Nf6 2.c4 e6 3.Nf3 b6 4.g3 Bb7 5.Bg2 Be7 6.0-0 0-0 7.Nc3
• Queen's Indian Defense: Classical Variation, Traditional Variation, Nimzowitsch Line: 1.d4 Nf6 2.c4 e6 3.Nf3 b6 4.g3 Bb7 5.Bg2 Be7 6.0-0 0-0 7.Nc3 d5
• Queen's Indian Defense: Classical Variation, Tiviakov Defense: 1.d4 Nf6 2.c4 e6 3.Nf3 b6 4.g3 Bb7 5.Bg2 Be7 6.0-0 0-0 7.Nc3 Na6

• E19 Queen's Indian, Old Main line, 9.Qxc3
• Queen's Indian Defense: Classical Variation, Traditional Variation, Main Line: 1.d4 Nf6 2.c4 e6 3.Nf3 b6 4.g3 Bb7 5.Bg2 Be7 6.0-0 0-0 7.Nc3 Ne4 8.Qc2 Nxc3 9.Qxc3

• E20 Nimzo-Indian Defence
• Nimzo-Indian Defense: 1.d4 Nf6 2.c4 e6 3.Nc3 Bb4
• Nimzo-Indian Defense: Kmoch Variation: 1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.f3
• Nimzo-Indian Defense: Romanishin Variation: 1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.g3
• Nimzo-Indian Defense: Romanishin Variation, English Hybrid: 1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.Nf3 c5 5.g3 cxd4 6.Nxd4 0-0 7.Bg2 d5 8.cxd5 Nxd5
• Nimzo-Indian Defense: Romanishin Variation: 1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.Nf3 c5 5.g3 0-0 6.Bg2
• Nimzo-Indian Defense: Mikenas Attack: 1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.Qd3

• E21 Nimzo-Indian, Three Knights Variation
• Nimzo-Indian Defense: Three Knights Variation: 1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.Nf3
• Nimzo-Indian Defense: Three Knights Variation, Korchnoi Variation: 1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.Nf3 c5 5.d5
• Nimzo-Indian Defense: Three Knights Variation, Euwe Variation: 1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.Nf3 c5 5.d5 Ne4
• Nimzo-Indian Defense: Three Knights Variation, Shocron Gambit: 1.d4 Nf6 2.c4 e6 3.Nf3 Bb4+ 4.Nc3 c5 5.d5 b5

• E22 Nimzo-Indian, Spielmann Variation
• Nimzo-Indian Defense: Spielmann Variation: 1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.Qb3

• E23 Nimzo-Indian, Spielmann, 4...c5, 5.dxc5 Nc6
• Nimzo-Indian Defense: Spielmann Variation, Romanovsky Gambit: 1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.Qb3 c5 5.dxc5 Nc6
• Nimzo-Indian Defense: Spielmann Variation, Stahlberg Variation: 1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.Qb3 c5 5.dxc5 Nc6 6.Nf3 Ne4 7.Bd2 Nxc5
• Nimzo-Indian Defense: Spielmann Variation, Stahlberg Variation: 1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.Qb3 c5 5.dxc5 Nc6 6.Nf3 Ne4 7.Bd2 Nxc5 8.Qc2 f5 9.g3
• Nimzo-Indian Defense: Spielmann Variation, Carlsbad Variation: 1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.Qb3 c5 5.dxc5 Nc6 6.Nf3 Ne4 7.Bd2 Nxd2

• E24 Nimzo-Indian, Sämisch Variation
• Nimzo-Indian Defense: Sämisch Variation, Accelerated: 1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.a3 Bxc3+ 5.bxc3
• Nimzo-Indian Defense: Sämisch Variation, Botvinnik Variation: 1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.f3 d5 5.a3 Bxc3+ 6.bxc3 c5 7.e3 0-0 8.cxd5 Nxd5

• E25 Nimzo-Indian, Sämisch Variation, Keres Variation
• Nimzo-Indian Defense: Sämisch Variation: 1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.f3 d5 5.a3 Bxc3+ 6.bxc3 c5 7.cxd5
• Nimzo-Indian Defense: Sämisch Variation, Keres Variation: 1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.f3 d5 5.a3 Bxc3+ 6.bxc3 c5 7.cxd5 Nxd5 8.dxc5
• Nimzo-Indian Defense: Sämisch Variation, Romanovsky Variation: 1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.f3 d5 5.a3 Bxc3+ 6.bxc3 c5 7.cxd5 Nxd5 8.dxc5 f5

• E26 Nimzo-Indian, Sämisch Variation, 4.a3 Bxc3+ 5.bxc3 c5 6.e3
• Nimzo-Indian Defense: Sämisch Variation: 1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.a3 Bxc3+ 5.bxc3 c5 6.e3
• Nimzo-Indian Defense: Sämisch Variation, O'Kelly Variation: 1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.a3 Bxc3+ 5.bxc3 c5 6.e3 b6

• E27 Nimzo-Indian, Sämisch Variation, 5...0-0
• Nimzo-Indian Defense: Sämisch Variation: 1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.a3 Bxc3+ 5.bxc3 0-0

• E28 Nimzo-Indian, Sämisch Variation, 6.e3
• Nimzo-Indian Defense: Sämisch Variation: 1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.e3 0-0 5.a3 Bxc3+ 6.bxc3

• E29 Nimzo-Indian, Sämisch Variation, Main line
• Nimzo-Indian Defense: Sämisch Variation: 1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.e3 c5 5.Bd3 Nc6 6.a3 Bxc3+ 7.bxc3 0-0
• Nimzo-Indian Defense: Sämisch Variation, Capablanca Variation: 1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.e3 c5 5.Bd3 Nc6 6.a3 Bxc3+ 7.bxc3 0-0 8.Ne2 b6 9.e4 Ne8

• E30 Nimzo-Indian, Leningrad Variation,
• Nimzo-Indian Defense: Leningrad Variation: 1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.Bg5
• Nimzo-Indian Defense: Leningrad Variation, Averbakh Gambit: 1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.Bg5 h6 5.Bh4 c5 6.d5 b5

• E31 Nimzo-Indian, Leningrad Variation, Main line
• Nimzo-Indian Defense: Leningrad Variation, Benoni Defense: 1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.Bg5 h6 5.Bh4 c5 6.d5 d6

• E32 Nimzo-Indian, Classical Variation (4.Qc2)
• Nimzo-Indian Defense: Classical Variation: 1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.Qc2
• Nimzo-Indian Defense: Classical Variation, Vitolins-Adorjan Gambit: 1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.Qc2 0-0 5.a3 Bxc3+ 6.Qxc3 b5
• Nimzo-Indian Defense: Classical Variation, Keres Defense: 1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.Qc2 0-0 5.a3 Bxc3+ 6.Qxc3 b6

• E33 Nimzo-Indian, Classical Variation, 4...Nc6
• Nimzo-Indian Defense: Classical Variation, Zurich Variation: 1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.Qc2 Nc6
• Nimzo-Indian Defense: Classical Variation, Milner-Barry Variation: 1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.Qc2 Nc6 5.Nf3 d6

• E34 Nimzo-Indian, Classical, Noa Variation (4...d5)
• Nimzo-Indian Defense: Classical Variation, Noa Variation: 1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.Qc2 d5
• Nimzo-Indian Defense: Classical Variation, Belyavsky Gambit: 1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.Qc2 d5 5.cxd5 Qxd5 6.Nf3 Qf5 7.Qd1 e5

• E35 Nimzo-Indian, Classical, Noa Variation, 5.cxd5 exd5
• Nimzo-Indian Defense: Classical Variation, Noa Variation: 1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.Qc2 d5 5.cxd5 exd5

• E36 Nimzo-Indian, Classical, Noa Variation, 5.a3
• Nimzo-Indian Defense: Classical Variation, Noa Variation: 1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.Qc2 d5 5.a3
• Nimzo-Indian Defense: Classical Variation, Noa Variation, Botvinnik Variation: 1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.Qc2 d5 5.a3 Bxc3+ 6.Qxc3 Nc6
• Nimzo-Indian Defense: Classical Variation, Noa Variation, Main Line: 1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.Qc2 d5 5.a3 Bxc3+ 6.Qxc3 Ne4

• E37 Nimzo-Indian, Classical, Noa Variation, Main line, 7.Qc2
• Nimzo-Indian Defense: Classical Variation, Noa Variation: 1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.Qc2 d5 5.a3 Bxc3+ 6.Qxc3 Ne4 7.Qc2
• Nimzo-Indian Defense: Classical Variation, Noa Variation, San Remo Variation: 1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.Qc2 d5 5.a3 Bxc3+ 6.Qxc3 Ne4 7.Qc2 Nc6 8.e3 e5

• E38 Nimzo-Indian, Classical, 4...c5
• Nimzo-Indian Defense: Classical Variation, Berlin Variation: 1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.Qc2 c5
• Nimzo-Indian Defense: Classical Variation, Berlin Variation, Steiner Variation: 1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.Qc2 c5 5.dxc5 Bxc3+

• E39 Nimzo-Indian, Classical, Pirc Variation
• Nimzo-Indian Defense: Classical Variation, Berlin Variation, Pirc Variation: 1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.Qc2 c5 5.dxc5 0-0
• Nimzo-Indian Defense: Classical Variation, Berlin Variation, Macieja System: 1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.Qc2 c5 5.dxc5 0-0 6.a3 Bxc5 7.Nf3 b6 8.Bf4

• E40 Nimzo-Indian, 4.e3
• Nimzo-Indian Defense: Normal Line: 1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.e3
• Nimzo-Indian Defense: Normal Variation, Taimanov Variation: 1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.e3 Nc6

• E41 Nimzo-Indian, 4.e3 c5 5.Bd3 Nc6 6.Nf3 Bxc3+ 7.bxc3 d6, Hübner Variation
• Nimzo-Indian Defense: Hübner Variation: 1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.e3 c5
• Nimzo-Indian Defense: Hübner Variation, Main Line: 1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.e3 c5 5.Bd3 Nc6 6.Nf3 Bxc3+ 7.bxc3 d6
• Nimzo-Indian Defense: Normal Variation, Hübner Deferred: 1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.e3 c5 5.Nf3 0-0

• E42 Nimzo-Indian, 4.e3 c5, 5.Ne2 (Rubinstein)
• Nimzo-Indian Defense: Hübner Variation, Rubinstein Variation: 1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.e3 c5 5.Ne2
• Nimzo-Indian Defense: Hübner Variation, Rubinstein Variation, Main Line: 1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.e3 c5 5.Ne2 cxd4 6.exd4 0-0 7.a3
• Nimzo-Indian Defense: Hübner Variation, Rubinstein Variation, Sherbakov Attack: 1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.e3 c5 5.Ne2 cxd4 6.exd4 0-0 7.c5

• E43 Nimzo-Indian, Fischer Variation
• Nimzo-Indian Defense: St. Petersburg Variation: 1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.e3 b6
• Nimzo-Indian Defense: St. Petersburg Variation: 1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.e3 b6 5.Bd3 Bb7 6.Nf3
• Nimzo-Indian Defense: St. Petersburg Variation, with Ne4: 1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.e3 b6 5.Bd3 Bb7 6.Nf3 Ne4
• Nimzo-Indian Defense: St. Petersburg Variation: 1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.e3 b6 5.Bd3 Bb7 6.Nf3 0-0
• Nimzo-Indian Defense: St. Petersburg Variation: 1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.e3 b6 5.Bd3 Bb7 6.Nf3 0-0 7.0-0
• Nimzo-Indian Defense: St. Petersburg Variation: 1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.e3 b6 5.Bd3 Bb7 6.Nf3 0-0 7.0-0 c5
• Nimzo-Indian Defense: St. Petersburg Variation: 1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.e3 b6 5.Bd3 Bb7 6.Nf3 0-0 7.0-0 c5 8.Na4 cxd4 9.a3 Be7
• Nimzo-Indian Defense: St. Petersburg Variation: 1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.e3 Ne4 5.Qc2 f5 6.Nf3 b6 7.Bd3 Bb7
• Nimzo-Indian Defense: St. Petersburg Variation: 1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.e3 0-0 5.Bd3 c5 6.Nf3 b6 7.0-0 Bb7 8.Na4 Qe7
• Nimzo-Indian Defense: St. Petersburg Variation: 1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.Nf3 b6 5.e3 Ne4 6.Qc2
• Nimzo-Indian Defense: St. Petersburg Variation: 1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.Nf3 b6 5.e3 Ne4 6.Qc2 Bb7 7.Bd3 Bxc3+ 8.bxc3 f5 9.0-0
• Nimzo-Indian Defense: St. Petersburg Variation: 1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.Nf3 Bxc3+ 5.bxc3 b6 6.e3 Bb7 7.Bd3 0-0 8.0-0

• E44 Nimzo-Indian, Fischer Variation, 5.Ne2
• Nimzo-Indian Defense: Fischer Variation: 1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.e3 b6 5.Ne2

• E45 Nimzo-Indian, 4.e3, Bronstein (Byrne) Variation
• Nimzo-Indian Defense: Normal Variation, Bronstein (Byrne) Variation: 1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.e3 b6 5.Ne2 Ba6

• E46 Nimzo-Indian, 4.e3 0-0
• Nimzo-Indian Defense: Normal Variation: 1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.e3 0-0
• Nimzo-Indian Defense: Reshevsky Variation: 1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.e3 0-0 5.Ne2
• Nimzo-Indian Defense: Simagin Variation: 1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.e3 0-0 5.Ne2 d5 6.a3 Bd6

• E47 Nimzo-Indian, 4.e3 0-0, 5.Bd3
• Nimzo-Indian Defense: Normal Variation, Bishop Attack: 1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.e3 0-0 5.Bd3

• E48 Nimzo-Indian, 4.e3 0-0, 5.Bd3 d5
• Nimzo-Indian Defense: Normal Variation, Bishop Attack, Classical Defense: 1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.e3 0-0 5.Bd3 d5
• Nimzo-Indian Defense: Ragozin Defense: 1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.e3 0-0 5.Bd3 d5 6.Nf3 Nc6 7.0-0

• E49 Nimzo-Indian, 4.e3, Botvinnik System
• Nimzo-Indian Defense: Normal Variation, Botvinnik System: 1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.e3 0-0 5.Bd3 d5 6.a3 Bxc3+ 7.bxc3

• E50 Nimzo-Indian, 4.e3 0-0, 5.Nf3, without ...d5
• Nimzo-Indian Defense: 1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.e3 0-0 5.Nf3

• E51 Nimzo-Indian, 4.e3 0-0, 5.Nf3 d5
• Nimzo-Indian Defense: Ragozin Variation: 1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.e3 0-0 5.Bd3 d5 6.Nf3 Nc6 7.0-0 dxc4
• Nimzo-Indian Defense: Normal Variation, Ragozin Variation: 1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.e3 0-0 5.Nf3 d5
• Nimzo-Indian Defense: Normal Variation, Sämisch Deferred: 1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.e3 0-0 5.Nf3 d5 6.a3

• E52 Nimzo-Indian, 4.e3, Main line with ...b6
• Nimzo-Indian Defense: Normal Variation, Schlechter Defense: 1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.e3 b6 5.Bd3 Bb7 6.Nf3 0-0 7.0-0 d5
• Nimzo-Indian Defense: Normal Variation, Schlechter Defense: 1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.e3 0-0 5.Bd3 d5 6.Nf3 b6

• E53 Nimzo-Indian, 4.e3, Main line with ...c5
• Nimzo-Indian Defense: Normal Variation, Gligoric System: 1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.e3 0-0 5.Bd3 d5 6.Nf3 c5
• Nimzo-Indian Defense: Normal Variation, Gligoric System, Keres Variation: 1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.e3 0-0 5.Bd3 d5 6.Nf3 c5 7.0-0 b6
• Nimzo-Indian Defense: Normal Variation, Gligoric System: 1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.e3 0-0 5.Bd3 d5 6.Nf3 c5 7.0-0 Nbd7

• E54 Nimzo-Indian, 4.e3, Gligoric System with 7...dxc4
• Nimzo-Indian Defense: Normal Variation, Gligoric System, Exchange Variation: 1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.e3 0-0 5.Bd3 d5 6.Nf3 c5 7.0-0 dxc4 8.Bxc4
• Nimzo-Indian Defense: Normal Variation, Gligoric System, Smyslov Variation: 1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.e3 0-0 5.Bd3 d5 6.Nf3 c5 7.0-0 dxc4 8.Bxc4 Qe7

• E55 Nimzo-Indian, 4.e3, Gligoric System, Bronstein Variation
• Nimzo-Indian Defense: Normal Variation, Gligoric System, Bronstein Variation: 1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.e3 0-0 5.Bd3 d5 6.Nf3 c5 7.0-0 dxc4 8.Bxc4 Nbd7

• E56 Nimzo-Indian, 4.e3, Main line with 7...Nc6
• Nimzo-Indian Defense: Normal Variation, Gligoric System, Bernstein Defense: 1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.e3 0-0 5.Bd3 d5 6.Nf3 c5 7.0-0 Nc6

• E57 Nimzo-Indian, 4.e3, Main line with 8...dxc4 and 9...Bxc4 cxd4
• 1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.e3 0-0 5.Nf3 d5 6.Bd3 c5 7.0-0 Nc6 8.a3 dxc4 9.Bxc4 cxd4

• E58 Nimzo-Indian, 4.e3, Main line with 8...Bxc3
• Nimzo-Indian Defense: Normal Variation, Bernstein Defense, Exchange Line: 1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.e3 0-0 5.Bd3 d5 6.Nf3 c5 7.0-0 Nc6 8.a3 Bxc3 9.bxc3

• E59 Nimzo-Indian, 4.e3, Main line
• Nimzo-Indian Defense: Normal Variation, Bernstein Defense: 1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.e3 0-0 5.Bd3 d5 6.Nf3 c5 7.0-0 Nc6 8.a3 Bxc3 9.bxc3 dxc4 10.Bxc4

1.d4 Nf6 2.c4 g6 without 3...d5: Indian systems with ...g6 (except Grünfeld)

• E60 King's Indian Defence
• Indian Defense: West Indian Defense: 1.d4 Nf6 2.c4 g6
• Indian Defense: Anti-Grünfeld, Advance Variation: 1.d4 Nf6 2.c4 g6 3.d5
• Indian Defense: Anti-Grünfeld, Adorjan Gambit: 1.d4 Nf6 2.c4 g6 3.d5 b5
• Indian Defense: Anti-Grünfeld, Alekhine Variation: 1.d4 Nf6 2.c4 g6 3.f3
• Indian Defense: Anti-Grünfeld, Alekhine Variation, Leko Gambit: 1.d4 Nf6 2.c4 g6 3.f3 e5
• King's Indian Defense: Fianchetto Variation, Immediate Fianchetto: 1.d4 Nf6 2.c4 g6 3.g3
• Indian Defense: King's Indian Variation, Fianchetto Variation: 1.d4 Nf6 2.c4 g6 3.g3 Bg7 4.Bg2
• Grünfeld Defense: Counterthrust Variation: 1.d4 Nf6 2.c4 g6 3.g3 Bg7 4.Bg2 d5
• Indian Defense: Anti-Grünfeld, Basman-Williams Attack: 1.d4 Nf6 2.c4 g6 3.h4
• King's Indian Defense: Semi-Classical Variation, Benoni Variation: 1.d4 Nf6 2.c4 g6 3.Nc3 Bg7 4.Nf3 0-0 5.e3 d6 6.Be2 c6
• King's Indian Defense: Santasiere Variation: 1.d4 Nf6 2.c4 g6 3.Nf3 Bg7 4.b4
• Queen's Pawn, Mengarini Attack: 1.d4 Nf6 2.c4 g6 3.Qc2
• King's Indian Defense: Normal Variation, King's Knight Variation: 1.d4 Nf6 2.Nf3 g6 3.c4
• King's Indian Defense: Semi-Classical Variation, Hollywood Variation: 1.d4 Nf6 2.Nf3 g6 3.c4 Bg7 4.Nc3 0-0 5.e3 d6 6.Be2 Nc6

• E61 King's Indian Defence, 3.Nc3
• King's Indian Defense: 1.d4 Nf6 2.c4 g6 3.Nc3
• King's Indian Defense: Smyslov Variation: 1.d4 Nf6 2.c4 g6 3.Nc3 Bg7 4.Nf3 d6 5.Bg5
• King's Indian Defense: Fianchetto Variation, Benjamin Defense: 1.d4 Nf6 2.c4 g6 3.Nc3 Bg7 4.Nf3 d6 5.g3 0-0 6.Bg2 c6 7.0-0 Qb6
• King's Indian Defense: Semi-Classical Variation: 1.d4 Nf6 2.c4 g6 3.Nc3 Bg7 4.Nf3 0-0 5.e3 d6 6.Be2
• King's Indian Defense: Semi-Classical Variation, Queenside Storm Line: 1.d4 Nf6 2.c4 g6 3.Nc3 Bg7 4.Nf3 0-0 5.e3 d6 6.Be2 Nbd7 7.0-0 e5 8.b4
• King's Indian Defense: Semi-Classical Variation, Exchange Variation: 1.d4 Nf6 2.c4 g6 3.Nc3 Bg7 4.Nf3 0-0 5.e3 d6 6.Be2 Nbd7 7.0-0 e5 8.dxe5 dxe5

• E62 King's Indian, Fianchetto Variation
• King's Indian Defense: Fianchetto Variation, Carlsbad Variation: 1.d4 Nf6 2.c4 g6 3.g3 Bg7 4.Bg2 0-0 5.Nc3 d6 6.Nf3 Nc6
• King's Indian Defense: Fianchetto Variation, Lesser Simagin (Spassky): 1.d4 Nf6 2.c4 g6 3.g3 Bg7 4.Bg2 0-0 5.Nc3 d6 6.Nf3 Nc6 7.0-0 Bf5
• King's Indian Defense: Fianchetto Variation, Delayed Fianchetto: 1.d4 Nf6 2.c4 g6 3.Nc3 Bg7 4.Nf3 d6 5.g3
• King's Indian Defense: Fianchetto Variation, Larsen Defense: 1.d4 Nf6 2.c4 g6 3.Nc3 Bg7 4.Nf3 d6 5.g3 0-0 6.Bg2 c6 7.0-0 Bf5
• King's Indian Defense: Fianchetto Variation, Simagin Variation: 1.d4 Nf6 2.c4 g6 3.Nc3 Bg7 4.Nf3 d6 5.g3 0-0 6.Bg2 Nc6 7.0-0 Bg4
• King's Indian Defense: Fianchetto Variation, Kavalek Defense: 1.d4 Nf6 2.c4 g6 3.Nf3 Bg7 4.g3 0-0 5.Bg2 d6 6.0-0 c6 7.Nc3 Qa5
• King's Indian Defense: Fianchetto Variation, Uhlmann-Szabo System: 1.d4 Nf6 2.c4 g6 3.Nf3 Bg7 4.g3 0-0 5.Bg2 d6 6.0-0 Nc6 7.Nc3 e5

• E63 King's Indian, Fianchetto, Panno Variation
• King's Indian Defense: Fianchetto Variation, Panno Variation: 1.d4 Nf6 2.c4 g6 3.Nf3 Bg7 4.g3 0-0 5.Bg2 d6 6.0-0 Nc6 7.Nc3 a6
• King's Indian Defense: Fianchetto Variation, Panno Variation, Blockade Line: 1.d4 Nf6 2.c4 g6 3.Nf3 Bg7 4.g3 0-0 5.Bg2 d6 6.0-0 Nc6 7.Nc3 a6 8.d5 Na5 9.Nd2 c5 10.Qc2 e5
• King's Indian Defense: Fianchetto Variation, Panno Variation, Donner Line: 1.d4 Nf6 2.c4 g6 3.Nf3 Bg7 4.g3 0-0 5.Bg2 d6 6.0-0 Nc6 7.Nc3 a6 8.d5 Na5 9.Nd2 c5 10.Qc2 Rb8 11.b3 b5 12.Bb2 bxc4 13.bxc4 Bh6
• King's Indian Defense: Fianchetto Variation, Panno Variation, Korchnoi Line: 1.d4 Nf6 2.c4 g6 3.Nf3 Bg7 4.g3 0-0 5.Bg2 d6 6.0-0 Nc6 7.Nc3 a6 8.h3 Rb8 9.Be3 b5 10.Nd2

• E64 King's Indian, Fianchetto, Yugoslav System
• King's Indian Defense: Fianchetto Variation, Yugoslav Variation, Rare Line: 1.d4 Nf6 2.c4 g6 3.g3 Bg7 4.Bg2 0-0 5.Nc3 d6 6.Nf3 c5
• King's Indian Defense: Fianchetto Variation, Pterodactyl Variation: 1.d4 Nf6 2.c4 g6 3.Nf3 Bg7 4.g3 c5 5.Bg2 Qa5+
• King's Indian Defense: Fianchetto Variation, Yugoslav System: 1.d4 Nf6 2.c4 g6 3.Nf3 Bg7 4.g3 d6 5.Bg2 0-0 6.0-0 c5
• King's Indian Defense: Fianchetto Variation, Hungarian Variation: 1.d4 Nf6 2.c4 g6 3.Nf3 Bg7 4.g3 d6 5.Bg2 0-0 6.0-0 Nbd7 7.Nc3 a6
• King's Indian Defense: Fianchetto Variation, Double Fianchetto Attack: 1.d4 Nf6 2.c4 g6 3.Nf3 Bg7 4.g3 d6 5.Bg2 0-0 6.0-0 Nbd7 7.Nc3 e5 8.b3

• E65 King's Indian, Yugoslav, 7.0-0
• King's Indian Defense: Fianchetto Variation, Yugoslav Variation: 1.d4 Nf6 2.c4 g6 3.Nf3 Bg7 4.g3 0-0 5.Bg2 d6 6.0-0 c5 7.Nc3
• King's Indian Defense: Fianchetto Variation, Yugoslav Variation, Exchange Line: 1.d4 Nf6 2.c4 g6 3.Nf3 Bg7 4.g3 0-0 5.Bg2 d6 6.0-0 c5 7.Nc3 Nc6 8.dxc5 dxc5

• E66 King's Indian, Fianchetto, Yugoslav Panno
• King's Indian Defense: Fianchetto Variation, Yugoslav Variation, Advance Line: 1.d4 Nf6 2.c4 g6 3.Nf3 Bg7 4.g3 0-0 5.Bg2 d6 6.0-0 c5 7.Nc3 Nc6 8.d5

• E67 King's Indian, Fianchetto with ...Nd7
• King's Indian Defense: Fianchetto Variation, Debrecen Defense: 1.d4 Nf6 2.c4 g6 3.g3 Bg7 4.Bg2 0-0 5.Nc3 d6 6.Nf3 Nbd7
• King's Indian Defense: Fianchetto Variation, Classical Fianchetto: 1.d4 Nf6 2.c4 g6 3.Nf3 Bg7 4.g3 0-0 5.Bg2 d6 6.0-0 Nbd7 7.Nc3 e5

• E68 King's Indian, Fianchetto, Classical Variation, 8.e4
• King's Indian Defense: Fianchetto Variation, Long Variation: 1.d4 Nf6 2.c4 g6 3.Nc3 Bg7 4.Nf3 d6 5.g3 0-0 6.Bg2 Nbd7 7.0-0 e5 8.e4 Re8 9.h3 exd4 10.Nxd4 Nc5 11.Re1 a5
• King's Indian Defense: Fianchetto Variation, Classical Variation: 1.d4 Nf6 2.c4 g6 3.Nf3 Bg7 4.g3 0-0 5.Bg2 d6 6.0-0 Nbd7 7.Nc3 e5 8.e4

• E69 King's Indian, Fianchetto, Classical Main line
• King's Indian Defense: Fianchetto Variation, Classical Main Line: 1.d4 Nf6 2.c4 g6 3.Nf3 Bg7 4.g3 0-0 5.Bg2 d6 6.0-0 Nbd7 7.Nc3 e5 8.e4 c6 9.h3

• E70 King's Indian, 4.e4
• King's Indian Defense: Normal Variation: 1.d4 Nf6 2.c4 g6 3.Nc3 Bg7 4.e4
• King's Indian Defense: Normal Variation: 1.d4 Nf6 2.c4 g6 3.Nc3 Bg7 4.e4 d6
• King's Indian Defense: Accelerated Averbakh Variation: 1.d4 Nf6 2.c4 g6 3.Nc3 Bg7 4.e4 d6 5.Bg5
• King's Indian Defense: Kramer Variation: 1.d4 Nf6 2.c4 g6 3.Nc3 Bg7 4.e4 d6 5.Nge2

• E71 King's Indian, Makogonov System (5.h3)
• King's Indian Defense: Makogonov Variation: 1.d4 Nf6 2.c4 g6 3.Nc3 Bg7 4.e4 d6 5.h3

• E72 King's Indian with e4 and g3
• King's Indian Defense: Normal Variation, Deferred Fianchetto: 1.d4 Nf6 2.c4 g6 3.Nc3 Bg7 4.e4 d6 5.g3
• King's Indian Defense: Pomar System: 1.d4 Nf6 2.c4 g6 3.Nc3 Bg7 4.e4 d6 5.g3 0-0 6.Bg2 e5 7.Nge2

• E73 King's Indian, 5.Be2
• King's Indian Defense: Normal Variation, Standard Development: 1.d4 Nf6 2.c4 g6 3.Nc3 Bg7 4.e4 d6 5.Be2
• King's Indian Defense: Semi-Averbakh System: 1.d4 Nf6 2.c4 g6 3.Nc3 Bg7 4.e4 d6 5.Be2 0-0 6.Be3
• King's Indian Defense: Averbakh Variation: 1.d4 Nf6 2.c4 g6 3.Nc3 Bg7 4.e4 d6 5.Be2 0-0 6.Bg5
• King's Indian Defense: Averbakh Variation, Spanish Defense: 1.d4 Nf6 2.c4 g6 3.Nc3 Bg7 4.e4 d6 5.Be2 0-0 6.Bg5 a6
• King's Indian Defense: Averbakh Variation, Flexible Defense: 1.d4 Nf6 2.c4 g6 3.Nc3 Bg7 4.e4 d6 5.Be2 0-0 6.Bg5 h6
• King's Indian Defense: Averbakh Variation, Modern Defense: 1.d4 Nf6 2.c4 g6 3.Nc3 Bg7 4.e4 d6 5.Be2 0-0 6.Bg5 Na6
• King's Indian Defense: Averbakh Variation, Modern Defense, Burgess Line: 1.d4 Nf6 2.c4 g6 3.Nc3 Bg7 4.e4 d6 5.Be2 0-0 6.Bg5 Na6 7.Qd2 c6
• King's Indian Defense: Averbakh Variation, Geller Defense: 1.d4 Nf6 2.c4 g6 3.Nc3 Bg7 4.e4 d6 5.Be2 0-0 6.Bg5 Nbd7
• King's Indian Defense: Averbakh Variation, Nc6 Defense: 1.d4 Nf6 2.c4 g6 3.Nc3 Bg7 4.e4 d6 5.Be2 0-0 6.Bg5 Nc6

• E74 King's Indian, Averbakh, 6...c5
• King's Indian Defense: Averbakh Variation, Benoni Defense: 1.d4 Nf6 2.c4 g6 3.Nc3 Bg7 4.e4 d6 5.Be2 0-0 6.Bg5 c5
• King's Indian Defense: Averbakh Variation, Benoni Defense, Advance Variation: 1.d4 Nf6 2.c4 g6 3.Nc3 Bg7 4.e4 d6 5.Be2 0-0 6.Bg5 c5 7.d5
• King's Indian Defense: Averbakh Variation, Benoni Defense, Exchange Variation: 1.d4 Nf6 2.c4 g6 3.Nc3 Bg7 4.e4 d6 5.Be2 0-0 6.Bg5 c5 7.dxc5

• E75 King's Indian, Averbakh, Main line
• King's Indian Defense: Averbakh Variation, Main Line: 1.d4 Nf6 2.c4 g6 3.Nc3 Bg7 4.e4 d6 5.Be2 0-0 6.Bg5 c5 7.d5 e6

• E76 King's Indian, Four Pawns Attack
• King's Indian Defense: Four Pawns Attack: 1.d4 Nf6 2.c4 g6 3.Nc3 Bg7 4.e4 d6 5.f4
• King's Indian Defense: Four Pawns Attack, Modern Defense: 1.d4 Nf6 2.c4 g6 3.Nc3 Bg7 4.e4 d6 5.f4 Na6
• King's Indian Defense: Four Pawns Attack, Dynamic Attack: 1.d4 Nf6 2.c4 g6 3.Nc3 Bg7 4.e4 d6 5.f4 0-0 6.Nf3 c5 7.d5

• E77 King's Indian, Four Pawns Attack, 6.Be2
• King's Indian Defense: Four Pawns Attack: 1.d4 Nf6 2.c4 g6 3.Nc3 Bg7 4.e4 d6 5.Be2 0-0 6.f4
• King's Indian Defense: Six Pawns Attack: 1.d4 Nf6 2.c4 g6 3.Nc3 Bg7 4.e4 d6 5.f4 0-0 6.Be2 c5 7.d5 e6 8.dxe6 fxe6 9.g4 Nc6 10.h4
• King's Indian Defense: Four Pawns Attack, Normal Attack: 1.d4 Nf6 2.c4 g6 3.Nc3 Bg7 4.e4 d6 5.f4 0-0 6.Nf3 c5 7.d5 e6 8.Be2
• King's Indian Defense: Four Pawns Attack, Florentine Gambit: 1.d4 Nf6 2.c4 g6 3.Nc3 Bg7 4.e4 d6 5.f4 0-0 6.Nf3 c5 7.d5 e6 8.Be2 exd5 9.e5

• E78 King's Indian, Four Pawns Attack, with Be2 and Nf3
• King's Indian Defense: Four Pawns Attack, Fluid Attack: 1.d4 Nf6 2.c4 g6 3.Nc3 Bg7 4.e4 d6 5.f4 0-0 6.Nf3 c5 7.Be2

• E79 King's Indian, Four Pawns Attack, Main line
• King's Indian Defense: Four Pawns Attack, Exchange Variation: 1.d4 Nf6 2.c4 g6 3.Nc3 Bg7 4.e4 d6 5.f4 0-0 6.Nf3 c5 7.Be2 cxd4 8.Nxd4 Nc6 9.Be3

• E80 King's Indian, Sämisch Variation
• King's Indian Defense: Sämisch Variation: 1.d4 Nf6 2.c4 g6 3.Nc3 Bg7 4.e4 d6 5.f3

• E81 King's Indian, Sämisch, 5...0-0
• King's Indian Defense: Sämisch Variation, Normal Defense: 1.d4 Nf6 2.c4 g6 3.Nc3 Bg7 4.e4 d6 5.f3 0-0
• King's Indian Defense: Sämisch Variation, Sämisch Gambit: 1.d4 Nf6 2.c4 g6 3.Nc3 Bg7 4.e4 d6 5.f3 0-0 6.Be3 c5
• King's Indian Defense: Sämisch Variation, Byrne Defense: 1.d4 Nf6 2.c4 g6 3.Nc3 Bg7 4.e4 d6 5.f3 0-0 6.Be3 c6 7.Bd3 a6
• King's Indian Defense: Steiner Attack: 1.d4 Nf6 2.c4 g6 3.Nc3 Bg7 4.e4 d6 5.f3 0-0 6.Bg5
• King's Indian Defense: Sämisch Variation, Bobotsov-Korchnoi-Petrosian Variation: 1.d4 Nf6 2.c4 g6 3.Nc3 Bg7 4.e4 d6 5.f3 0-0 6.Nge2

• E82 King's Indian, Sämisch, Double Fianchetto Variation
• King's Indian Defense: Sämisch Variation, Double Fianchetto: 1.d4 Nf6 2.c4 g6 3.Nc3 Bg7 4.e4 d6 5.f3 0-0 6.Be3 b6

• E83 King's Indian, Sämisch, 6...Nc6 (Panno Variation)
• King's Indian Defense: Sämisch Variation, Yates Defense: 1.d4 Nf6 2.c4 g6 3.Nc3 Bg7 4.e4 d6 5.f3 0-0 6.Be3 Nc6
• King's Indian Defense: Sämisch Variation, Panno Formation: 1.d4 Nf6 2.c4 g6 3.Nc3 Bg7 4.e4 d6 5.f3 0-0 6.Be3 Nc6 7.Nge2 a6
• King's Indian Defense: Sämisch Variation, Ruban Variation: 1.d4 Nf6 2.c4 g6 3.Nc3 Bg7 4.e4 d6 5.f3 0-0 6.Be3 Nc6 7.Nge2 Rb8

• E84 King's Indian, Sämisch, Panno Main line
• King's Indian Defense: Sämisch Variation, Panno Main Line: 1.d4 Nf6 2.c4 g6 3.Nc3 Bg7 4.e4 d6 5.f3 0-0 6.Be3 Nc6 7.Nge2 a6 8.Qd2 Rb8

• E85 King's Indian, Sämisch, Orthodox Variation
• King's Indian Defense: Sämisch Variation, Orthodox Variation: 1.d4 Nf6 2.c4 g6 3.Nc3 Bg7 4.e4 d6 5.f3 0-0 6.Be3 e5

• E86 King's Indian, Sämisch, Orthodox, 7.Nge2 c6
• King's Indian Defense: Sämisch Variation: 1.d4 Nf6 2.c4 g6 3.Nc3 Bg7 4.e4 d6 5.f3 0-0 6.Be3 e5 7.Nge2 c6

• E87 King's Indian, Sämisch, Orthodox, 7.d5
• King's Indian Defense: Sämisch Variation, Closed Variation: 1.d4 Nf6 2.c4 g6 3.Nc3 Bg7 4.e4 d6 5.f3 0-0 6.Be3 e5 7.d5
• King's Indian Defense: Sämisch Variation, Bronstein Defense: 1.d4 Nf6 2.c4 g6 3.Nc3 Bg7 4.e4 d6 5.f3 0-0 6.Be3 e5 7.d5 Nh5 8.Qd2 Qh4+ 9.g3 Nxg3 10.Qf2 Nxf1 11.Qxh4 Nxe3 12.Ke2
• King's Indian Defense: Sämisch Variation, Orthodox Variation, Bronstein Variation: 1.d4 Nf6 2.c4 g6 3.Nc3 Bg7 4.e4 d6 5.f3 0-0 6.Be3 e5 7.d5 Nh5 8.Qd2 Qh4+ 9.g3 Nxg3 10.Qf2 Nxf1 11.Qxh4 Nxe3 12.Ke2 Nxc4

• E88 King's Indian, Sämisch, Orthodox, 7.d5 c6
• 1.d4 Nf6 2.c4 g6 3.Nc3 Bg7 4.e4 d6 5.f3 0-0 6.Be3 e5 7.d5 c6

• E89 King's Indian, Sämisch, Orthodox Main line
• King's Indian Defense: Sämisch Variation, Closed Variation, Main Line: 1.d4 Nf6 2.c4 g6 3.Nc3 Bg7 4.e4 d6 5.f3 0-0 6.Be3 e5 7.Nge2 c6 8.d5 cxd5

• E90 King's Indian, 5.Nf3
• King's Indian Defense: Normal Variation, Rare Defenses: 1.d4 Nf6 2.c4 g6 3.Nc3 Bg7 4.e4 d6 5.Nf3
• King's Indian Defense: Larsen Variation: 1.d4 Nf6 2.c4 g6 3.Nc3 Bg7 4.e4 d6 5.Nf3 0-0 6.Be3
• King's Indian Defense: Zinnowitz Variation: 1.d4 Nf6 2.c4 g6 3.Nc3 Bg7 4.e4 d6 5.Nf3 0-0 6.Bg5

• E91 King's Indian, 6.Be2
• King's Indian Defense: Orthodox Variation: 1.d4 Nf6 2.c4 g6 3.Nc3 Bg7 4.e4 d6 5.Nf3 0-0 6.Be2
• King's Indian Defense: Kazakh Variation: 1.d4 Nf6 2.c4 g6 3.Nc3 Bg7 4.e4 d6 5.Nf3 0-0 6.Be2 Na6

• E92 King's Indian, Classical Variation
• King's Indian Defense: Orthodox Variation: 1.d4 Nf6 2.c4 g6 3.Nc3 Bg7 4.e4 d6 5.Nf3 0-0 6.Be2 e5
• King's Indian Defense: Orthodox Variation, Gligoric-Taimanov System: 1.d4 Nf6 2.c4 g6 3.Nc3 Bg7 4.e4 d6 5.Nf3 0-0 6.Be2 e5 7.Be3
• King's Indian Defense: Petrosian Variation: 1.d4 Nf6 2.c4 g6 3.Nc3 Bg7 4.e4 d6 5.Nf3 0-0 6.Be2 e5 7.d5
• King's Indian Defense: Petrosian Variation, Stein Defense: 1.d4 Nf6 2.c4 g6 3.Nc3 Bg7 4.e4 d6 5.Nf3 0-0 6.Be2 e5 7.d5 a5
• King's Indian Defense: Exchange Variation: 1.d4 Nf6 2.c4 g6 3.Nc3 Bg7 4.e4 d6 5.Nf3 0-0 6.Be2 e5 7.dxe5

• E93 King's Indian, Petrosian System, Main line
• King's Indian Defense: Petrosian Variation, Normal Defense: 1.d4 Nf6 2.c4 g6 3.Nc3 Bg7 4.e4 d6 5.Nf3 0-0 6.Be2 e5 7.d5 Nbd7
• King's Indian Defense: Petrosian Variation, Keres Defense: 1.d4 Nf6 2.c4 g6 3.Nc3 Bg7 4.e4 d6 5.Nf3 0-0 6.Be2 e5 7.d5 Nbd7 8.Bg5 h6 9.Bh4 g5 10.Bg3 Nh5 11.h4

• E94 King's Indian, Orthodox Variation
• King's Indian Defense: Orthodox Variation, Positional Defense: 1.d4 Nf6 2.c4 d6 3.Nc3 Nbd7 4.e4 e5 5.Nf3 g6 6.Be2 Bg7 7.0-0 0-0
• King's Indian Defense: Orthodox Variation: 1.d4 Nf6 2.c4 g6 3.Nc3 Bg7 4.e4 d6 5.Nf3 0-0 6.Be2 e5 7.0-0
• King's Indian Defense: Orthodox Variation, Ukrainian Defense: 1.d4 Nf6 2.c4 g6 3.Nc3 Bg7 4.e4 d6 5.Nf3 0-0 6.Be2 e5 7.0-0 a5
• King's Indian Defense: Orthodox Variation, Donner Defense: 1.d4 Nf6 2.c4 g6 3.Nc3 Bg7 4.e4 d6 5.Nf3 0-0 6.Be2 e5 7.0-0 c6
• King's Indian Defense: Orthodox Variation, Glek Defense: 1.d4 Nf6 2.c4 g6 3.Nc3 Bg7 4.e4 d6 5.Nf3 0-0 6.Be2 e5 7.0-0 Na6
• King's Indian Defense: Orthodox Variation, Positional Defense, Closed Line: 1.d4 Nf6 2.c4 g6 3.Nc3 Bg7 4.e4 d6 5.Nf3 0-0 6.Be2 Nbd7 7.0-0 e5 8.d5

• E95 King's Indian, Orthodox, 7...Nbd7, 8.Re1
• King's Indian Defense: Orthodox Variation: 1.d4 Nf6 2.c4 g6 3.Nc3 Bg7 4.e4 d6 5.Nf3 0-0 6.Be2 e5 7.0-0 Nbd7 8.Re1

• E96 King's Indian, Orthodox, 7...Nbd7, Main line
• King's Indian Defense: Orthodox Variation, Positional Defense, Main Line: 1.d4 Nf6 2.c4 g6 3.Nc3 Bg7 4.e4 d6 5.Nf3 0-0 6.Be2 e5 7.0-0 Nbd7 8.Re1 c6 9.Bf1 a5

• E97 King's Indian, Orthodox, Aronin–Taimanov Variation (Yugoslav Attack / Mar del Plata Variation)
• King's Indian Defense: Orthodox Variation, Aronin-Taimanov Defense: 1.d4 Nf6 2.c4 g6 3.Nc3 Bg7 4.e4 d6 5.Nf3 0-0 6.Be2 e5 7.0-0 Nc6
• King's Indian Defense: Orthodox Variation, Bayonet Attack: 1.d4 Nf6 2.c4 g6 3.Nc3 Bg7 4.e4 d6 5.Nf3 0-0 6.Be2 e5 7.0-0 Nc6 8.d5 Ne7 9.b4
• King's Indian Defense: Orthodox Variation, Bayonet Attack, Yepishin's Line: 1.d4 Nf6 2.c4 g6 3.Nc3 Bg7 4.e4 d6 5.Nf3 0-0 6.Be2 e5 7.0-0 Nc6 8.d5 Ne7 9.b4 Nh5 10.Qc2
• King's Indian Defense: Orthodox Variation, Bayonet Attack, Sokolov's Line: 1.d4 Nf6 2.c4 g6 3.Nc3 Bg7 4.e4 d6 5.Nf3 0-0 6.Be2 e5 7.0-0 Nc6 8.d5 Ne7 9.b4 Nh5 10.Re1
• King's Indian Defense: Orthodox Variation, Korchnoi Attack: 1.d4 Nf6 2.c4 g6 3.Nc3 Bg7 4.e4 d6 5.Nf3 0-0 6.Be2 e5 7.0-0 Nc6 8.d5 Ne7 9.Bd2
• King's Indian Defense: Orthodox Variation, Modern System: 1.d4 Nf6 2.c4 g6 3.Nc3 Bg7 4.e4 d6 5.Nf3 0-0 6.Be2 e5 7.0-0 Nc6 8.d5 Ne7 9.Nd2

• E98 King's Indian, Orthodox, Aronin–Taimanov, 9.Ne1
• King's Indian Defense: Orthodox Variation, Classical System: 1.d4 Nf6 2.c4 g6 3.Nc3 Bg7 4.e4 d6 5.Nf3 0-0 6.Be2 e5 7.0-0 Nc6 8.d5 Ne7 9.Ne1
• King's Indian Defense: Orthodox Variation, Classical System, Neo-Classical Line: 1.d4 Nf6 2.c4 g6 3.Nc3 Bg7 4.e4 d6 5.Nf3 0-0 6.Be2 e5 7.0-0 Nc6 8.d5 Ne7 9.Ne1 Nd7 10.Be3
• King's Indian Defense: Orthodox Variation, Classical System, Kozul Gambit: 1.d4 Nf6 2.c4 g6 3.Nc3 Bg7 4.e4 d6 5.Nf3 0-0 6.Be2 e5 7.0-0 Nc6 8.d5 Ne7 9.Ne1 Nd7 10.Be3 f5 11.f3 f4 12.Bf2 g5 13.Rc1 Ng6 14.c5

• E99 King's Indian, Orthodox, Aronin–Taimanov, Defence
• King's Indian Defense: Orthodox Variation, Classical System, Traditional Line: 1.d4 Nf6 2.c4 g6 3.Nc3 Bg7 4.e4 d6 5.Nf3 0-0 6.Be2 e5 7.0-0 Nc6 8.d5 Ne7 9.Ne1 Nd7 10.f3 f5
• King's Indian Defense: Orthodox Variation, Classical System, Benko Attack: 1.d4 Nf6 2.c4 g6 3.Nc3 Bg7 4.e4 d6 5.Nf3 0-0 6.Be2 e5 7.0-0 Nc6 8.d5 Ne7 9.Ne1 Nd7 10.f3 f5 11.g4

Moves	1800–1900	1901–1935	1935–1998
1.e4 e5	63%	31%	15%
1.e4 other	23%	20%	35%
1.d4 d5	10%	28%	15%
1.d4 other	3%	16%	23%
1.other		5%	12%

These statistics show a movement away from symmetrical defences to asymmetrical defences. In particular, in reply to 1.e4, the Sicilian and French defences, and to 1.d4 the Indian defences. Also, particularly amongst strong players, an increased use of the English Opening for White.^[1]

• Chess opening theory table
• List of chess openings named after people
• List of chess openings named after places

• Opening theory in chess at Wikibooks