Koseki, Takuya
Current rating: 1410
| Grand Prix Nagoya 2012 (RTR standard) | starting rating: 1463 | |||
| round | table | opponent (rating) | result | Δrating |
| 1standard | 38 | Takagi, Kazuki (1449) | Lost 0-2 | -191444 |
| 2standard | 634 | Kawaguchi, Akira (1494) | Lost 0-2 | -171427 |
| 3standard | 716 | Kunisada, Kenichiro (1446) | Lost 0-2 | -171410 |
| top | average opponent: 1463record: 0-3 | new rating: 1410 | ||
| Grand Prix Yokohama 2012 (modern) | starting rating: 1481 | |||
| round | table | opponent (rating) | result | Δrating |
| 1modern | 84 | Arai, Takeshi (1453) | Won 2-0 | +181499 |
| 2modern | 86 | Takehana, Yuki (1462) | Won 2-1 | +171516 |
| 3modern | 196 | Tezuka, Yuuki (1507) | Lost 1-2 | -181498 |
| 4modern | 327 | Shirakihara, Ryuuichi (1502) | Lost 0-2 | -181480 |
| 5modern | 396 | Suzuike, Fumiyasu (1497) | Lost 0-2 | -171463 |
| top | average opponent: 1484record: 2-3 | new rating: 1463 | ||
| Grand Prix Sendai 2010 (ROE standard) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1standard | 49 | Nagai, Mamoru (1450) | Lost 0-2 | -191481 |
| 2standard | 270 | Shimizu, Shougo (1482) | Won 2-0 | +181499 |
| 3standard | 252 | Mukai, Isao (1501) | Lost 1-2 | -181481 |
| 4standard | 398 | Kawahata, Shigenobu (1481) | Lost 0-2 | -181463 |
| 5standard | 383 | Sasaki, Shinji (1461) | Won 2-0 | +181481 |
| 6standard | 307 | Itou, Takanori (1541) | Won 2-0 | +191500 |
| 7standard | 216 | Imamura, Hirotaka (1462) | Lost 0-2 | -191481 |
| top | average opponent: 1482record: 3-4 | new rating: 1481 | ||