| event | round | table | player one | result | player two |
| Grand Prix Fukuoka 2002 | 12 | 8 | Nakajima, Chikara (1660) | Lost 0-2 | Ishida, Itaru (1887) |
| Grand Prix Utsunomiya 2002 | 5 | 21 | Nakajima, Chikara (1591) | Won 2-0 | Ishida, Itaru (1872) |
| Grand Prix Utsunomiya 2002 | 9 | 15 | Nakajima, Chikara (1616) | Won 2-1 | Ishida, Itaru (1876) |
| Grand Prix Okayama 2004 | 8 | 1 | Nakajima, Chikara (1682) | Lost 0-2 | Ishida, Itaru (2026) |
| Grand Prix Taipei 2005 | 5 | 50 | Nakajima, Chikara (1638) | Won 2-1 | Ishida, Itaru (1989) |