Koyama, Kaoru
Current rating: 1551
Record: 17-13-2
| Grand Prix Shizuoka 2015 (KTK limited) | starting rating: 1541 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 3 | Mizuguchi, Jun (1362) | Draw 1-1 | -31538 |
| 2sealed | 257 | Hirooka, Yoshihiro (1499) | Won 2-0 | +171555 |
| 3sealed | 228 | Matsumoto, Masaya (1491) | Won 2-1 | +171572 |
| 4sealed | 121 | Katayama, Hiroki (1573) | Lost 1-2 | -181554 |
| 5sealed | 230 | Asahina, Takuya (1451) | Draw 1-1 | -21552 |
| 6sealed | 302 | Nasu, Kenichi (1465) | Won 2-0 | +171569 |
| 7sealed | 220 | Hasegawa, Kazuhiko7811 (1618) | Lost 1-2 | -181551 |
| top | average opponent: 1494record: 3-2-2 | new rating: 1551 | ||
| Grand Prix Shizuoka 2013 (THS standard) | starting rating: 1551 | |||
| round | table | opponent (rating) | result | Δrating |
| 1standard | 535 | Kashima, Akihiro (1494) | Won 2-0 | +171568 |
| 2standard | 534 | Hamada, Etsuo (1520) | Lost 1-2 | -191549 |
| 3standard | 829 | Ishino, Katsunori (1464) | Lost 1-2 | -191530 |
| 4standard | 854 | Hong, Jeongmo (1465) | Won 2-1 | +171547 |
| 5standard | 707 | Motoki, Takahiro (1433) | Lost 1-2 | -201527 |
| 6standard | 785 | Shinmura, Yuuki (1482) | Won 2-0 | +171544 |
| 7standard | 726 | Isoda, Bunta (1501) | Won 2-0 | +171561 |
| 8standard | 664 | Meguro, Masahiko (1458) | Lost 0-2 | -201541 |
| top | average opponent: 1477record: 4-4 | new rating: 1541 | ||
| Grand Prix Yokohama 2013 (GTC limited) | starting rating: 1539 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 1065 | Nomachi, Takayuki (1500) | Lost 0-2 | -191520 |
| 2sealed | 1093 | Yasuda, Kazuki (1485) | Won 2-1 | +181538 |
| 3sealed | 982 | Watahiki, Satoru (1497) | Won 2-1 | +171555 |
| 4sealed | 970 | Takesue, Chikara (1691) | Lost 1-2 | -161539 |
| 5sealed | 1026 | Tada, Masayuu (1419) | Won 2-1 | +161555 |
| 6sealed | 856 | Itou, Hirokazu (1472) | Lost 1-2 | -191536 |
| 7sealed | 878 | Hashimoto, Masatoshi (1547) | Won 2-0 | +181554 |
| 8sealed | 1000 | Takasawa, Sho (1518) | Lost 0-2 | -191535 |
| 9sealed | 985 | Taniguchi, Hironobu (1430) | Won 2-1 | +161551 |
| top | average opponent: 1507record: 5-4 | new rating: 1551 | ||
| Grand Prix Nagoya 2012 (RTR standard) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1standard | 358 | Sekine, Naoto (1555) | Lost 0-2 | -171483 |
| 2standard | 432 | Nakashima, Shinsuke (1482) | Lost 1-2 | -181465 |
| 3standard | 671 | Kaneko, Kayo (1464) | Won 2-0 | +181483 |
| 4standard | 650 | Yamada, Takahiro (1465) | Won 2-1 | +181501 |
| 5standard | 402 | Takahashi, Tomoo (1405) | Won 2-0 | +161517 |
| 6standard | 485 | Matsuda, Tomohiro (1587) | Won 2-0 | +191536 |
| 7standard | 221 | Sasaki, Tsuyoshi (1579) | Lost 1-2 | -171519 |
| 8standard | 277 | Tabata, Yuusuke (1629) | Won 2-0 | +201539 |
| top | average opponent: 1521record: 5-3 | new rating: 1539 | ||