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81diver (Japanese: ハチワンダイバー, Hepburn: Hachi Wan Daibā) is a Japanese shogi-themed manga series written and illustrated by Yokusaru Shibata. It was serialized in Shueisha's seinen manga magazine Weekly Young Jump from September 2006 to July 2014, with its chapters collected in 35 tankōbon volumes. The story follows Kentarō Sugata, a shogi player who, after failing to go pro, is inspired to take the game seriously again following a defeat by Soyo Nakashizu, a champion with a surprising side job.