Iwahashi, Kouki
Current rating: 1458
Record: 4-7
| Grand Prix Chiba 2016 (legacy) | starting rating: 1512 | |||
| round | table | opponent (rating) | result | Δrating |
| 1legacy | 553 | Nakazawa, Koutarou (1468) | Lost 0-2 | -191493 |
| 2legacy | 621 | Yamada, Michihiro (1447) | Lost 0-2 | -191474 |
| 3legacy | 1069 | Suzuki, Yuta (1451) | Lost 0-2 | -181456 |
| 4legacy | 1166 | Sato, Motoki (1411) | Won 2-0 | +171473 |
| 5legacy | 1106 | Sekine, Naoto (1628) | Lost 0-2 | -151458 |
| average opponent: 1481record: 1-4 | new rating: 1458 | |||
| Grand Prix Kitakyushu 2009 (ZEN limited) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 34 | Sakamoto, Ryouhei (1500) | Won 2-1 | +181518 |
| 2sealed | 84 | Imagawa, Hiromasa (1693) | Won 2-0 | +211539 |
| 3sealed | 52 | Inanaga, Nobuyuki (1542) | Lost 0-2 | -181521 |
| 4sealed | 129 | Honda, Hirohito (1463) | Won 2-0 | +171538 |
| 5sealed | 56 | Ishii, Hayato (1818) | Lost 0-2 | -131525 |
| 6sealed | 76 | Ruel, Olivier (1802) | Lost 1-2 | -131512 |
| average opponent: 1636record: 3-3 | new rating: 1512 | |||