| event | round | table | player one | result | player two |
| Grand Prix Kobe 2001 | 14 | 8 | Ishikawa, Ren (1602) | Draw 1-1 | Shiozu, Ryouma (1683) |
| 2005 World Championship | 16 | 11 | Ishikawa, Ren (1856) | Lost 0-2 | Shiozu, Ryouma (1861) |
| Grand Prix Kobe 2008 | 11 | 16 | Ishikawa, Ren (1891) | Won 2-0 | Shiozu, Ryouma (1823) |