Kozakai, Ryouhei
Current rating: 1433
| Grand Prix Yokohama 2012 (modern) | starting rating: 1431 | |||
| round | table | opponent (rating) | result | Δrating |
| 4modern | 150 | Yanase, Kaname (1557) | Won 2-0 | +211452 |
| 5modern | 81 | Iwasaki, Yuusuke (1887) | Lost 0-2 | -111441 |
| 6modern | 161 | Nishi, Nobunari (1565) | Won 2-0 | +201461 |
| 7modern | 29 | Takahashi, Nozomu (1643) | Lost 1-2 | -141447 |
| 8modern | 120 | Hosokawa, Yuya (1715) | Lost 1-2 | -141433 |
| top | average opponent: 1673record: 2-3 | new rating: 1433 | ||
| Grand Prix Yamagata 2006 (TSP limited) | starting rating: 1483 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 75 | Date, Hiroshi (1446) | Lost 0-2 | -191464 |
| 2sealed | 123 | Kobara, Shinji (1493) | Won 2-0 | +191483 |
| 3sealed | 75 | Watanabe, Hiroto (1599) | Lost 1-2 | -161467 |
| 4sealed | 143 | Satou, Keita (1485) | Lost 1-2 | -181449 |
| 5sealed | 136 | Satou, Masataka (1466) | Lost 0-2 | -181431 |
| top | average opponent: 1498record: 1-4 | new rating: 1431 | ||
| Grand Prix Yokohama 2004 (COK limited) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 81 | Noguchi, Keita (1452) | Lost 0-2 | -191481 |
| 2sealed | 276 | Yoda, Yuuji (1449) | Won 2-0 | +181499 |
| 3sealed | 258 | Krejsa, Tomas (1632) | Won 2-1 | +201519 |
| 4sealed | 95 | Chijimi, Keiichi (1588) | Lost 1-2 | -171502 |
| 5sealed | 173 | Uotsu, Atsushi (1479) | Lost 0-1 | -181484 |
| 6sealed | 185 | Kishida, Hirokazu (1449) | Won 2-0 | +171501 |
| 7sealed | 141 | Tsuda, Junichi (1480) | Lost 0-2 | -181483 |
| top | average opponent: 1504record: 3-4 | new rating: 1483 | ||