Kotaka, Hiroki
Current rating: 1449
Record: 4-7
| Grand Prix Yokohama 2012 (modern) | starting rating: 1445 | |||
| round | table | opponent (rating) | result | Δrating |
| 2modern | 254 | Sugimura, Yoshiyasu (1538) | Lost 1-2 | -171428 |
| 3modern | 557 | Wakahara, Kazumi (1500) | Won 2-1 | +201448 |
| 4modern | 272 | Yamashita, Kohji (1408) | Won 2-0 | +171465 |
| 5modern | 172 | Fukuda, Yuuki (1517) | Lost 1-2 | -171448 |
| 6modern | 422 | Kawano, Yuuya (1455) | Lost 1-2 | -181430 |
| 7modern | 390 | Kobayashi, Yuuki (1500) | Won 2-0 | +191449 |
| average opponent: 1486record: 3-3 | new rating: 1449 | |||
| Grand Prix Yokohama 2010 (extended) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1extended | 292 | Nakazuka, Yuuki (1429) | Lost 1-2 | -191481 |
| 2extended | 298 | Araki, Youhei (1514) | Won 2-1 | +181499 |
| 3extended | 212 | Suzuki, Hiroumi (1503) | Lost 0-2 | -181481 |
| 4extended | 438 | Sogou, Yohei (1480) | Lost 1-2 | -181463 |
| 5extended | 413 | Suzuki, Gou (1429) | Lost 0-2 | -181445 |
| average opponent: 1471record: 1-4 | new rating: 1445 | |||