Hasegawa, Koki
Current rating: 1440
| Grand Prix Nagoya 2020 (pioneer) | starting rating: 1465 | |||
| round | table | opponent (rating) | result | Δrating |
| 1pioneer | 322 | Sugawara, Kohei (1500) | Won 2-1 | +191484 |
| 2pioneer | 216 | Hasegawa, Keijiro (1615) | Lost 0-2 | -161468 |
| 3pioneer | 676 | Nanamori, Kouhei (1701) | Lost 1-2 | -141454 |
| 4pioneer | 694 | Takano, Masahiro (1673) | Lost 1-2 | -141440 |
| top | average opponent: 1622record: 1-3 | new rating: 1440 | ||
| Grand Prix Yokohama 2019 (modern) | starting rating: 1519 | |||
| round | table | opponent (rating) | result | Δrating |
| 1modern | 510 | Mihashi, Takanobu (1550) | Lost 1-2 | -181501 |
| 2modern | 715 | Yoshitomi, Tomoya (1482) | Lost 0-2 | -181483 |
| 3modern | 1157 | Kondo, Masahiro 8757 (1494) | Lost 0-2 | -181465 |
| top | average opponent: 1508record: 0-3 | new rating: 1465 | ||
| Grand Prix Chiba 2018 (M19 limited) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 274 | Oda, Ryutaro (1513) | Lost 1-2 | -181482 |
| 2sealed | 721 | Mizukoshi, Hideyuki (1382) | Won 2-0 | +161498 |
| 3sealed | 769 | Musashi, Yutaka (1632) | Won 2-0 | +211519 |
| 4sealed | 281 | Naoi, Shingo (1549) | Lost 1-2 | -181501 |
| 5sealed | 717 | Fujita, Toshitake (1472) | Won 2-0 | +181519 |
| 6sealed | 347 | Katsuragi, Atsushi (1556) | Won 2-1 | +191538 |
| 7sealed | 390 | Negishi, Haruki (1487) | Lost 0-2 | -191519 |
| top | average opponent: 1513record: 4-3 | new rating: 1519 | ||