no Ichiban Nagai Hi: Dai Nanajūsanki A Kyū Jun'isen Saishūkyoku 将棋界の一番長い日: 第73期A級順位戦最終局 [Shogi's Longest Day: The Final Round of the 73rd Class A Ranking...

Dan (十段戦 jū-dan sen) title tournament. The Tenth Dan (1962–1987) itself is a continuation of the Ninth Dan (九段戦, 1956–1961) and the earlier 全日本選手権戦 (1948–1955)...