Ishii, Yoshimasa
Current rating: 1521
| Grand Prix Matsuyama 2005 (BOK limited) | starting rating: 1524 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 12 | Sugimoto, Masayuki (1500) | Won 2-1 | +171541 |
| 2sealed | 73 | Deyama, Hirofumi (1392) | Lost 0-2 | -201521 |
| 3sealed | 76 | Matsuura, Kentarou (1500) | Won 2-0 | +171538 |
| 4sealed | 127 | Tsuji, Makoto (1521) | Won 2-1 | +181556 |
| 5sealed | 52 | Inanaga, Nobuyuki (1550) | Lost 0-2 | -181538 |
| 6sealed | 75 | Nakano, Fumiki (1601) | Lost 1-2 | -171521 |
| top | average opponent: 1511record: 3-3 | new rating: 1521 | ||
| Grand Prix Hiroshima 2003 (extended) | starting rating: 1481 | |||
| round | table | opponent (rating) | result | Δrating |
| 1extended | 102 | Saito, Ryo (1521) | Won 2-0 | +191500 |
| 2extended | 5 | Nakajima, Chikara (1658) | Lost 0-1 | -151485 |
| 3extended | 84 | Ishida, Naoyuki (1483) | Won 2-0 | +181503 |
| 4extended | 105 | Furukawa, Hiroki (1519) | Won 2-1 | +181521 |
| 5extended | 36 | Harino, Takuichi (1519) | Lost 0-2 | -181503 |
| 6extended | 67 | Kojima, Yoshimasa (1503) | Won 2-0 | +181521 |
| 7extended | 75 | Maeba, Hideaki (1566) | Lost 0-2 | -171504 |
| 8extended | 65 | Oiso, Masashi (1624) | Won 2-0 | +201524 |
| top | average opponent: 1549record: 5-3 | new rating: 1524 | ||
| Grand Prix Hiroshima 2001 (INV limited) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 111 | Matsui, Hisataka (1500) | Lost 0-2 | -181482 |
| 2sealed | 156 | Iwade, Takashi (1482) | Won 2-0 | +181500 |
| 3sealed | 113 | Ueno, Kazuki (1501) | Won 2-0 | +181518 |
| 4sealed | 48 | Adachi, Yuhei (1502) | Lost 0-2 | -181500 |
| 5sealed | 111 | Takemoto, Takaaki (1483) | Lost 1-2 | -191481 |
| 6sealed | 123 | Hattori, Keitarou (1483) | Lost 0-2 | -181463 |
| 7sealed | 118 | Mukuno, Yuuji (1435) | Won 2-1 | +181481 |
| top | average opponent: 1484record: 3-4 | new rating: 1481 | ||