Sekiyama Sendaiu
Keywords: People
関山仙太夫 (Japanese Sekiyama Sendayū) 1784-1859. Samurai, amateur player of 5 dan professional strength. Famous for his 20-game match against Honinbo Shusaku.
valerio: correct name of this player is Sekiyama Sendayu, I think.
Bob McGuigan: These are just alternative romanizations of his Japanese name.