Mànhuà 《Qíhún》 lǐ de Zuǒwéi fùshēn yú Běnyīnfāng Xiùcè.
In the manga 'Hikaru no Go,' Sai possesses Honinbo Shusaku.
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Shusaku played for the Honinbo (本因坊) school, one of four official Go houses in Edo-period Japan. He went 19-0 in the Castle Games (御城碁) and is still regarded as the strongest player of the pre-modern era.