Oka, Masatoshi
Current rating: 1446
Record: 2-5
| Grand Prix Yokohama 2003 (Onslaught block) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1block | 205 | Takahashi, Naoyuki (1500) | Lost 1-2 | -181482 |
| 2block | 287 | Watanabe, Masayoshi (1482) | Lost 0-2 | -181464 |
| 3block | 376 | Goto, Takashi (1503) | Won 2-1 | +191483 |
| 4block | 333 | Kondo, Takahito (1455) | Lost 1-2 | -191464 |
| 5block | 313 | Cosic, Refik (1462) | Won 2-1 | +181482 |
| 6block | 310 | Seto, Masakazu (1487) | Lost 0-2 | -181464 |
| 7block | 281 | Nakajima, Mikihito (1463) | Lost 1-2 | -181446 |
| average opponent: 1479record: 2-5 | new rating: 1446 | |||