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

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