Matsumoto, Sumiaki
Current rating: 1466
Record: 2-4
| Grand Prix Yokohama 2003 (Onslaught block) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1block | 70 | Kawasaki, Yoshimichi (1500) | Won 2-1 | +181518 |
| 2block | 57 | Wada, Tomohiro (1517) | Won 2-0 | +181536 |
| 3block | 52 | Kozakai, Yukio (1563) | Lost 0-2 | -181518 |
| 4block | 204 | Chijimi, Keiichi (1602) | Lost 0-2 | -161502 |
| 5block | 277 | Yamamoto, Kentaro (1483) | Lost 0-2 | -181484 |
| 6block | 259 | Okutomi, Hiromitsu (1495) | Lost 0-2 | -181466 |
| average opponent: 1527record: 2-4 | new rating: 1466 | |||