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    vs.      
Jun ya Takahashi leads the series against Norihiko Koshiba, 2-0.

event round table player one result player two
Grand Prix Hiroshima 2006686Takahashi, Jun ya (1504)Won 2-1Koshiba, Norihiko (1547)
Grand Prix Okayama 2008364Takahashi, Jun ya (1603)Won 2-0Koshiba, Norihiko (1535)