| event | round | table | player one | result | player two |
| Grand Prix Hiroshima 2001 | 9 | 8 | Ishida, Itaru (1611) | Lost 1-2 | Mori, Katsuhiro (1751) |
| Grand Prix Sendai 2001 | 7 | 3 | Ishida, Itaru (1813) | ID | Mori, Katsuhiro (1947) |
| 2002 World Championship | 18 | 26 | Ishida, Itaru (1794) | ID | Mori, Katsuhiro (1904) |
| 2004 World Championship | 14 | 32 | Ishida, Itaru (1874) | Lost 1-2 | Mori, Katsuhiro (1957) |
| Grand Prix Kitakyushu 2005 | 13 | 4 | Ishida, Itaru (2038) | Won 2-0 | Mori, Katsuhiro (2048) |