Sekiyama Toshio

関山利夫

(1937–1992) Kansai Ki-in 9 dan pro. Son of Sekiyama Riichi (関山利一).

Hasegawa Sunao, Sekiyama Toshimichi (his son), Shimada Yoshikuni, and Konno Tameto are his pupils.

Sekiyama Toshio was the third of Japan’s first five-generation professional Go family.

He was the son of Sekiyama Riichi 9p, grandson of Sekiyama Moritoshi 4p, father of Sekiyama Toshimichi 9p, and grandfather of Sekiyama Honoka 1p.