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    vs.      
Tsutomu Date leads the series against Tsuyoshi Iwai, 1-0-1.

event round table player one result player two
Grand Prix Kobe 2001928Date, Tsutomu (1571)Draw 1-1Iwai, Tsuyoshi (1606)
Grand Prix Yokohama 20038186Date, Tsutomu (1522)Won 2-0Iwai, Tsuyoshi (1678)