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    vs.      
Koutarou Ootsuka is tied in the series against Takayuki Nagaoka, 1-1.

event round table player one result player two
Grand Prix Kobe 20121218Ootsuka, Koutarou (1925)Lost 1-2Nagaoka, Takayuki (1849)
Grand Prix Kobe 2015513Ootsuka, Koutarou (1829)Won 2-0Nagaoka, Takayuki (1869)