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    vs.      
Koji Ishihara is tied in the series against Satoshi Nagata, 1-1.

event round table player one result player two
Grand Prix Kobe 201711129Ishihara, Koji (1628)Lost 0-2Nagata, Satoshi (1435)
Grand Prix Yokohama 20193202Ishihara, Koji (1575)Won 2-1Nagata, Satoshi (1485)