Koga, Seiya
Current rating: 1568
Record: 7-3-1
| Grand Prix Kyoto 2015 (legacy) | starting rating: 1573 | |||
| round | table | opponent (rating) | result | Δrating |
| 1legacy | 725 | Yamauchi, Yasuhiro (1555) | Won 2-0 | +181591 |
| 2legacy | 715 | Nakazawa, Yusuke (1340) | Lost 0-2 | -231568 |
| average opponent: 1448record: 1-1 | new rating: 1568 | |||
| Grand Prix Kobe 2014 (modern) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1modern | 65 | Kawaguchi, Yousuke (1462) | Won 2-1 | +171517 |
| 2modern | 177 | Soma, Daiki (1483) | Won 2-1 | +181535 |
| 3modern | 108 | Yamaguchi, Yuji (1483) | Won 2-0 | +171552 |
| 4modern | 25 | Ishii, Hiroyuki (1642) | Won 2-1 | +191571 |
| 5modern | 55 | Tang, Kenneth (1485) | Won 2-0 | +171588 |
| 6modern | 66 | Matsumoto, Yuki1423 (1784) | Lost 1-2 | -151573 |
| 7modern | 88 | Nishikawa, Yukihiro (1532) | Draw 1-1 | 01573 |
| 8modern | 102 | Uchida, Yuki (1557) | Lost 0-2 | -191554 |
| 9modern | 151 | Shiba, Yunosuke (1591) | Won 2-0 | +191573 |
| average opponent: 1558record: 6-2-1 | new rating: 1573 | |||