event | round | table | player one | result | player two |
Grand Prix Kyoto 2003 | 9 | 29 | Katayama, Takahiro (1610) | Won 2-0 | Yamamoto, Akimasa (1629) |
Grand Prix Kyoto 2003 | 12 | 4 | Katayama, Takahiro (1630) | Draw 1-1 | Yamamoto, Akimasa (1645) |
Grand Prix Okayama 2008 | 5 | 32 | Katayama, Takahiro (1781) | Lost 1-2 | Yamamoto, Akimasa (1730) |