Otsuka, Hiroki
Current rating: 1501
Record: 5-6
| Grand Prix Yamagata 2006 (TSP limited) | starting rating: 1448 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 97 | Kou, Nobuaki (1438) | Lost 0-2 | -181430 |
| 2sealed | 127 | Date, Tsutomu (1557) | Won 2-1 | +201450 |
| 3sealed | 74 | Nikkuni, Fumihito (1631) | Won 2-0 | +221472 |
| 4sealed | 112 | Eguchi, Motoaki (1449) | Won 2-1 | +171489 |
| 5sealed | 47 | Ishikawa, Ren (1828) | Won 2-1 | +241513 |
| 6sealed | 54 | Tatsuhara, Satoshi (1517) | Won 2-0 | +181531 |
| 7sealed | 47 | Okamoto, Masahiro (1600) | Lost 0-2 | -161515 |
| 8sealed | 28 | Ishii, Taisuke (1743) | Lost 0-2 | -141501 |
| average opponent: 1595record: 5-3 | new rating: 1501 | |||
| Grand Prix Niigata 2005 (Kamigawa block) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 4block | 50 | Murata, Yutaka (1420) | Lost 1-2 | -191481 |
| 5block | 86 | Nakamura, Keisuke (1644) | Lost 0-2 | -161465 |
| 6block | 99 | Nakajima, Takumi (1514) | Lost 0-2 | -171448 |
| average opponent: 1526record: 0-3 | new rating: 1448 | |||