Hattori, Koichi
Current rating: 1469
Record: 1-3-1
| Grand Prix Yokohama 2019 (modern) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1modern | 65 | Sakigawara, Yuhei (1622) | Won 2-1 | +201520 |
| 2modern | 342 | Kurita, Yudai (1641) | Draw 1-1 | +21522 |
| 3modern | 549 | Oono, Kazutaka (1516) | Lost 0-2 | -181504 |
| 4modern | 799 | Hinata, Makoto (1543) | Lost 0-2 | -171487 |
| 5modern | 957 | Okada, Yuki 9361 (1484) | Lost 0-2 | -181469 |
| average opponent: 1561record: 1-3-1 | new rating: 1469 | |||