Itaru Ishida is tied in the series against
Kazuya Hirabayashi, 2-2-1.
| event |
round |
table |
player one |
result |
player two |
| Grand Prix Sendai 2001 | 13 | 1 | Ishida, Itaru (1893) | ID | Hirabayashi, Kazuya (1853) |
| Grand Prix Utsunomiya 2002 | 11 | 17 | Ishida, Itaru (1868) | Lost 0-2 | Hirabayashi, Kazuya (1768) |
| Grand Prix Okayama 2004 | 6 | 2 | Ishida, Itaru (2000) | Won 2-0 | Hirabayashi, Kazuya (1685) |
| Grand Prix Okayama 2004 | Q | | Ishida, Itaru (2046) | Won 2-0 | Hirabayashi, Kazuya (1743) |
| Grand Prix Matsuyama 2005 | 9 | 6 | Ishida, Itaru (1948) | Lost 0-2 | Hirabayashi, Kazuya (2010) |