Kasahara, Koichi
Current rating: 1489
Record: 14-16-1
| Grand Prix Chiba 2018 (M19 limited) | starting rating: 1437 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 337 | Xu, Chenghao (1386) | Won 2-0 | +181455 |
| 2sealed | 197 | Takeyama, Maya (1404) | Won 2-0 | +171472 |
| 3sealed | 56 | Takesue, Chikara (1793) | Won 2-1 | +231495 |
| 4sealed | 6 | Kawase, Yoshihiko (1642) | Won 2-0 | +211516 |
| 5sealed | 11 | Kato, Jun (1570) | Won 2-0 | +191535 |
| 6sealed | 7 | He, Yue 8578 (1774) | Lost 0-2 | -141521 |
| 7sealed | 186 | Yasuda, Hisashi (1573) | Lost 0-2 | -171504 |
| 8sealed | 249 | Otahara, Sho (1662) | Lost 1-2 | -151489 |
| top | average opponent: 1601record: 5-3 | new rating: 1489 | ||
| Grand Prix Shizuoka 2017 (AER standard) | starting rating: 1485 | |||
| round | table | opponent (rating) | result | Δrating |
| 3standard | 292 | Kawahara, Masanobu (1415) | Won 2-1 | +161501 |
| 4standard | 162 | Ikarashi, Satoru (1526) | Lost 1-2 | -171484 |
| 5standard | 485 | Hasegawa, Shun-ya (1455) | Won 2-1 | +171501 |
| 6standard | 231 | Uno, Yuki (1541) | Won 2-0 | +191520 |
| 7standard | 168 | Hashimoto, Keisuke3846 (1558) | Won 2-1 | +191539 |
| 8standard | 57 | Nomura, Tsuyoshi (1667) | Lost 1-2 | -161523 |
| 9standard | 250 | Kosaka, Kazune (1573) | Lost 0-2 | -171506 |
| 10standard | 389 | Tomita, Ryutaro (1477) | Lost 1-2 | -191487 |
| 11standard | 352 | Onoda, Kenji (1486) | Lost 0-2 | -181469 |
| 12standard | 348 | Futami, Yoshiki (1505) | Won 2-0 | +191488 |
| 13standard | 268 | Okamura, Takumi (1532) | Lost 0-2 | -171471 |
| 14standard | 294 | Miyata, Kentaro (1525) | Lost 0-2 | -171454 |
| 15standard | 298 | Ishikawa, Fumiaki (1547) | Lost 1-2 | -171437 |
| top | average opponent: 1524record: 5-8 | new rating: 1437 | ||
| Grand Prix Shizuoka 2015 (KTK limited) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 748 | Nakayama, Akitsugu (1481) | Won 2-1 | +181518 |
| 2sealed | 804 | Tanaka, Eiji (1462) | Lost 1-2 | -191499 |
| 3sealed | 1021 | Suzuki, Kazushige (1644) | Lost 1-2 | -161483 |
| 4sealed | 1082 | Chiba, Takato (1483) | Won 2-1 | +181501 |
| 5sealed | 856 | Uchimura, Yoshihiro (1570) | Lost 0-2 | -161485 |
| top | average opponent: 1528record: 2-3 | new rating: 1485 | ||
| Grand Prix Yokohama 2013 (GTC limited) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 102 | Yajima, Shouta (1500) | Lost 1-2 | -181482 |
| 2sealed | 311 | Oikawa, Kurumi (1482) | Draw 1-1 | 01482 |
| 3sealed | 419 | Katoh, Daisuke (1553) | Won 2-0 | +191501 |
| 4sealed | 339 | Nishiguchi, Hajime (1453) | Won 2-0 | +171518 |
| 5sealed | 234 | Suzuki, Masahiro 5436 (1498) | Lost 1-2 | -181500 |
| top | average opponent: 1497record: 2-2-1 | new rating: 1500 | ||