The Kamakura jubango (十番碁, ten-match game) was a historically significant go match played in Japan in 1939, 1940 and 1941.
[1] It pitted Kitani Minoru and Go Seigen, close rivals for a decade and friends at a personal level, and both ranked 7 dan, against each other.
The pool of top players was rather small; Karigane Junichi was 8 dan but had stayed outside the system that had established itself around Shusai and the Nihon Ki-in.
The result of the match was the first step in the process by which Go Seigen would establish ascendancy over his rivals (except Sekiyama, who withdrew from competition because of bad health).
The starting conditions of the match were tagaisen; since the players were of equal rank: colours alternated, with Kitani winning the nigiri.