Shogi is a major chess variant in Japan. This article presents two shogi competitions: the World Computer Shogi Championship, the largest annual competition held by the Computer Shogi Association, and The Floodgate, which is a complementary internet competition held voluntarily by researchers. Notable technical contributions made by participants and useful resources for prospective developers are also presented. The techniques and therefore playing strength are still improving, partly because both competitions have attracted active participants, even after the playing strength of computer programs has apparently surpassed that of human players.
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