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    vs.      
Kentaro Yamamoto is tied in the series against Hayato Ishii, 1-1.

event round table player one result player two
Grand Prix Niigata 200984Yamamoto, Kentaro (1878)Won 2-0Ishii, Hayato (1806)
Grand Prix Niigata 20091513Yamamoto, Kentaro (1896)Lost 0-2Ishii, Hayato (1810)