Koga, Takashi
Current rating: 1439
Record: 6-9-1
| Grand Prix Chiba 2016 (legacy) | starting rating: 1498 | |||
| round | table | opponent (rating) | result | Δrating |
| 1legacy | 266 | Sato, Motoki (1467) | Won 2-1 | +171515 |
| 2legacy | 44 | Shimamura, Yukihiro (1578) | Lost 0-2 | -171498 |
| 3legacy | 805 | Sakou, Yuuta (1555) | Won 2-1 | +191517 |
| 4legacy | 348 | Igarashi, Kei (1447) | Lost 0-2 | -191498 |
| 5legacy | 850 | Ishida, Tetsuya (1416) | Lost 1-2 | -201478 |
| 6legacy | 863 | Mastumoto, Shuji (1480) | Lost 0-2 | -171461 |
| 7legacy | 946 | Okazawa, Tatsuya (1270) | Lost 0-2 | -221439 |
| average opponent: 1459record: 2-5 | new rating: 1439 | |||
| Grand Prix Kyoto 2015 (legacy) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1legacy | 798 | Eura, Hiroki (1520) | Won 2-1 | +181518 |
| 2legacy | 600 | Matsunaga, Koutarou (1545) | Lost 0-2 | -171501 |
| 3legacy | 789 | Tanaka, Keiichi (1450) | Lost 0-2 | -191482 |
| 4legacy | 864 | Satake, Tetuo (1480) | Won 2-0 | +181500 |
| 5legacy | 813 | Kawamata, Norio (1498) | Lost 1-2 | -181482 |
| 6legacy | 801 | Horiuchi, Taisuke (1430) | Lost 1-2 | -191463 |
| 7legacy | 800 | Sakamoto, Humiyuki (1440) | Won 2-0 | +181481 |
| 8legacy | 755 | Suzuki, Nobuya (1466) | Won 2-0 | +171498 |
| 9legacy | 678 | Regalado, Mikhail (1466) | Draw 1-1 | 01498 |
| average opponent: 1477record: 4-4-1 | new rating: 1498 | |||