Koga, Ichiro
Current rating: 1466
Record: 2-4
| Grand Prix Shizuoka 2018 (legacy) (legacy) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1legacy | 280 | Ishimaru, Naoki (1473) | Lost 1-2 | -181482 |
| 2legacy | 442 | Asakawa, Hiroya (1502) | Lost 1-2 | -181464 |
| 3legacy | 588 | Toshida, Shin'ichi (1375) | Won 2-0 | +161480 |
| 4legacy | 560 | Mark, Gwyther (1484) | Won 2-1 | +181498 |
| 5legacy | 359 | Sasao, Yusuke (1709) | Lost 0-1 | -141484 |
| 6legacy | 529 | Wada, Kazumasa (1452) | Lost 0-2 | -181466 |
| average opponent: 1499record: 2-4 | new rating: 1466 | |||