Watarai, Kohei
Current rating: 1434
| Grand Prix Chiba 2019 (M20 limited) | starting rating: 1475 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 465 | Hayashi, Nobuhiko (1407) | Lost 0-2 | -191456 |
| 2sealed | 790 | Nishimura, Koichi (1283) | Won 2-1 | +151471 |
| 3sealed | 757 | Tsunoda, Masaki (1390) | Lost 0-2 | -191452 |
| 4sealed | 968 | Toyama, Takashi (1455) | Lost 1-2 | -181434 |
| top | average opponent: 1384record: 1-3 | new rating: 1434 | ||
| Grand Prix Chiba 2018 (M19 limited) | starting rating: 1482 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 534 | Obitsu, Youtarou (1711) | Lost 0-2 | -141468 |
| 2sealed | 791 | Yamamoto, Shohei 2804 (1482) | Won 2-0 | +191487 |
| 3sealed | 580 | Wachi, Shinya (1674) | Won 2-0 | +211508 |
| 4sealed | 309 | Mitsui, Hideo (1721) | Lost 1-2 | -141494 |
| 5sealed | 570 | Konno, Tomoyuki (1472) | Lost 1-2 | -191475 |
| top | average opponent: 1612record: 2-3 | new rating: 1475 | ||
| Grand Prix Kobe 2017 (modern) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 2modern | 353 | Nagase, Yoshinobu (1514) | Lost 0-2 | -181482 |
| top | record: 0-1 | new rating: 1482 | ||