Koakutsu, Masato
Current rating: 1555
Record: 6-3
| Grand Prix Yokohama 2010 (extended) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1extended | 163 | Kabutomori, You (1488) | Lost 1-2 | -181482 |
| 2extended | 309 | Sakurai, Yuu (1454) | Won 2-0 | +171499 |
| 3extended | 200 | Tajima, Kenji (1442) | Lost 0-2 | -191480 |
| 4extended | 461 | Hiroki, Ryouta (1482) | Won 2-1 | +181498 |
| 5extended | 375 | Nagano, Yuuya (1500) | Won 2-1 | +181516 |
| 6extended | 219 | Speed, Erek (1521) | Won 2-1 | +181534 |
| 7extended | 203 | Shiraishi, Masaharu (1574) | Won 2-0 | +191553 |
| 8extended | 100 | Suzuki, Kazushige (1530) | Won 2-1 | +181571 |
| 9extended | 54 | Fukuta, Shingo (1713) | Lost 1-2 | -161555 |
| average opponent: 1523record: 6-3 | new rating: 1555 | |||