Osumi, Keigo
Current rating: 1524
| Grand Prix Yokohama 2010 (extended) | starting rating: 1490 | |||
| round | table | opponent (rating) | result | Δrating |
| 1extended | 429 | Kamanaka, Yuuhei (1417) | Won 2-0 | +171507 |
| 2extended | 241 | Igarashi, Jun (1480) | Won 2-1 | +171524 |
| 3extended | 141 | Tsukagoshi, Tadaki (1559) | Lost 0-2 | -171507 |
| 4extended | 263 | Tajima, Kenji (1461) | Won 2-1 | +171524 |
| 5extended | 134 | Izumi, Masaru (1560) | Won 2-1 | +191543 |
| 6extended | 90 | Ichikawa, Keizou (1504) | Won 2-1 | +171560 |
| 7extended | 68 | Miyashiro, Ronaldo (1582) | Lost 1-2 | -181542 |
| 8extended | 209 | Se, Atsuo (1542) | Lost 1-2 | -181524 |
| top | average opponent: 1513record: 5-3 | new rating: 1524 | ||
| Grand Prix Yokohama 2004 (COK limited) | starting rating: 1486 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 53 | Yazawa, Yasuhiro (1469) | Won 2-0 | +181504 |
| 2sealed | 174 | Murayama, Yoshiyuki (1625) | Won 2-0 | +201524 |
| 3sealed | 57 | Sato, Shinichi (1642) | Won 2-0 | +201544 |
| 4sealed | 73 | Teramoto, Shoji (1582) | Lost 1-2 | -171527 |
| 5sealed | 67 | Oikawa, Mutsuki (1526) | Lost 1-2 | -181509 |
| 6sealed | 161 | Katayose, Shingo (1529) | Lost 0-2 | -181491 |
| 7sealed | 133 | Ito, Hidetoshi (1399) | Won 2-1 | +171508 |
| 8sealed | 20 | Toyota, Kazuhisa (1525) | Lost 1-2 | -181490 |
| top | average opponent: 1537record: 4-4 | new rating: 1490 | ||
| Grand Prix Utsunomiya 2002 (ONS rochester) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 271 | Terasawa, Kazuya (1659) | Lost 1-2 | -151485 |
| 2sealed | 232 | Takagi, Riichiro (1466) | Draw 1-1 | 01485 |
| 3sealed | 259 | Yagi, Akira (1527) | Won 2-1 | +181503 |
| 4sealed | 188 | Sakai, Naoko (1557) | Lost 0-2 | -171486 |
| top | average opponent: 1552record: 1-2-1 | new rating: 1486 | ||