Oosawa, Masashi
Current rating: 1462
| Grand Prix Shizuoka 2008 (MOR standard) | starting rating: 1492 | |||
| round | table | opponent (rating) | result | Δrating |
| 1standard | 237 | Tawaraya, Takehito (1500) | Lost 0-2 | -181474 |
| 2standard | 265 | Yasukawa, Kazuhide (1589) | Won 2-0 | +201494 |
| 3standard | 255 | Asano, Kouichi (1483) | Lost 1-2 | -181476 |
| 4standard | 363 | Sakuma, Toshimitsu (1705) | Draw 1-1 | +41480 |
| 5standard | 307 | Mohr, Felix (1479) | Lost 1-2 | -181462 |
| top | average opponent: 1551record: 1-3-1 | new rating: 1462 | ||
| Grand Prix Niigata 2005 (Kamigawa block) | starting rating: 1464 | |||
| round | table | opponent (rating) | result | Δrating |
| 1block | 6 | Ono, Wataru (1500) | Lost 1-2 | -171447 |
| 2block | 149 | Hisaki, Yuu (1508) | Won 2-0 | +191466 |
| 3block | 131 | Aida, Ippei (1497) | Won 2-1 | +191485 |
| 4block | 146 | Satou, Kenji (1615) | Lost 1-2 | -161469 |
| 5block | 157 | Kosuga, Shuhei (1438) | Won 2-0 | +171486 |
| 6block | 135 | Saso, Kazuho (1504) | Won 2-0 | +191505 |
| 7block | 94 | Ibamoto, Masami (1778) | Draw 1-1 | +51510 |
| 8block | 82 | Oodan, Takeshi (1521) | Lost 0-2 | -181492 |
| top | average opponent: 1545record: 4-3-1 | new rating: 1492 | ||
| Grand Prix Yokohama 2004 (COK limited) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 226 | Goshi, Tatsuya (1500) | Won 2-0 | +181518 |
| 2sealed | 84 | Yamaguchi, Yuuichi (1510) | Lost 0-2 | -181500 |
| 3sealed | 135 | Nakao, Munenari (1428) | Lost 0-2 | -191481 |
| 4sealed | 227 | Sugiura, Kiyohiro (1525) | Won 2-1 | +181499 |
| 5sealed | 165 | Saijo, Yuichi (1518) | Lost 0-2 | -171482 |
| 6sealed | 182 | Tsuchiya, Heinrich (1584) | Lost 0-2 | -161466 |
| 7sealed | 156 | Takahira, Wataru (1391) | Draw 1-1 | -21464 |
| top | average opponent: 1494record: 2-4-1 | new rating: 1464 | ||