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

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