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    vs.      
Kenji Oiso is tied in the series against Tatsuumi Kobayashi, 1-1.

event round table player one result player two
Grand Prix Yokohama 20199179Oiso, Kenji (1815)Won 2-0Kobayashi, Tatsuumi (2035)
Regional Championships Aichi 20231211Oiso, Kenji (1909)Lost 1-2Kobayashi, Tatsuumi (1792)