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

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