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Ken-Ichi Ishii is a 2-time world Othello champion, winning his first world title in 1983 in Paris and again in 1987 in Milan.

Ken-Ichi won the 1983 All-Japan championship at the age of 20 and won his first world title that same year in Paris defeating Imre Leader(GBR) in two games in the WOC final. In 1984 Ken-Ichi won the prestigious Meijin title defeating the previous title holder Takeshi Hasegawa, and would keep the title for the next 3 years until 1987. Ken-Ichi won the All-Japan championship a second time in 1987, followed by a second world title in Milan defeating Paul Ralle(FRA) in three games in the WOC final, the first between two former world champions.

World Othello Champion 1983, Paris, France World Othello Champion 1987, Milan, Italy All-Japan Championship 1983, 1987 Meijin 1984, 1985, 1986