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    vs.      
Kentaro Yamamoto is tied in the series against Kohei Niwa, 1-1.

event round table player one result player two
Grand Prix Yokohama 2010265Yamamoto, Kentaro (1853)Won 2-1Niwa, Kohei (1531)
Grand Prix Nagoya 20121250Yamamoto, Kentaro (1892)Lost 1-2Niwa, Kohei (1566)