Koyama, Kazuhiko
Current rating: 1447
Record: 2-5-1
| Grand Prix Kyoto 2015 (legacy) | starting rating: 1463 | |||
| round | table | opponent (rating) | result | Δrating |
| 1legacy | 176 | Kurikawa, Hideyuki (1428) | Draw 1-1 | 01463 |
| 2legacy | 223 | Saito, Hajime (1548) | Won 2-1 | +191482 |
| 3legacy | 224 | Nagao, Akio (1475) | Lost 1-2 | -181464 |
| 4legacy | 314 | Mitsuboshi, Yuki (1547) | Lost 0-2 | -171447 |
| average opponent: 1499record: 1-2-1 | new rating: 1447 | |||
| Grand Prix Yokohama 2010 (extended) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1extended | 253 | Katou, Shinya (Kanagawa (1502) | Won 2-1 | +181518 |
| 2extended | 259 | Matsushima, Yuuya (1496) | Lost 0-2 | -181500 |
| 3extended | 375 | Ikeda, Yuuichirou (1504) | Lost 0-2 | -181482 |
| 4extended | 411 | Fujimori, Masayoshi (1452) | Lost 0-2 | -191463 |
| average opponent: 1489record: 1-3 | new rating: 1463 | |||