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    vs.      
Kohei Yamadaya is tied in the series against Toshiharu Niwa, 1-1.

event round table player one result player two
Grand Prix Shizuoka 2001138Yamadaya, Kohei (1596)Won 2-0Niwa, Toshiharu (1671)
Grand Prix Fukuoka 2002426Yamadaya, Kohei (1699)Lost 1-2Niwa, Toshiharu (1660)