Iwamoto, Gohki
Current rating: 1533
Record: 5-3
| Grand Prix Yokohama 2003 (Onslaught block) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1block | 56 | Ohno, Isao (1500) | Lost 1-2 | -181482 |
| 2block | 240 | Furuta, Shinichi (1461) | Lost 0-2 | -181464 |
| 3block | 349 | Nagata, Hikaru (1463) | Won 2-0 | +181482 |
| 4block | 299 | Ogawa, Masahiro (1429) | Won 2-1 | +171499 |
| 5block | 268 | Kuroda, Yousuke (1499) | Lost 1-2 | -181481 |
| 6block | 276 | Mikami, Iesato (1413) | Won 2-1 | +161497 |
| 7block | 222 | Yamaguchi, Kei (1500) | Won 2-0 | +181515 |
| 8block | 140 | Tamai, Katsuyoshi (1494) | Won 2-0 | +181533 |
| average opponent: 1470record: 5-3 | new rating: 1533 | |||