Japanese Go player of the Edo period who won all 19 of his castle games, played before the shogun. The anime 棋魂 (Hikaru no Go) made him known to Chinese Go fans.
In the manga 'Hikaru no Go,' Sai possesses Honinbo Shusaku.
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history
The 本因坊 in his name is an honour: he was only the heir of the Honinbo house and died of cholera at 33 before he could head it. His most famous game is the 1846 耳赤之局, 'ear-reddening game', named for his opponent's ears flushing at one of his moves.