Kumada, Hiroki
Current rating: 1414
Record: 3-8-2
| Grand Prix Chiba 2018 (M19 limited) | starting rating: 1424 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 342 | Kinugasa, Satoshi (1833) | Lost 1-2 | -111413 |
| 2sealed | 744 | Konagai, Ryota (1495) | Won 2-1 | +201433 |
| 3sealed | 656 | Xu, Chenghao (1392) | Won 2-0 | +171450 |
| 4sealed | 515 | Yamada, Junki (1463) | Lost 0-2 | -181432 |
| 5sealed | 566 | Iriki, Takumi (1440) | Lost 0-2 | -181414 |
| average opponent: 1525record: 2-3 | new rating: 1414 | |||
| Grand Prix Shizuoka 2017 (AER standard) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1standard | 466 | Ishida, Syota (1471) | Lost 1-2 | -191481 |
| 2standard | 750 | Tsujimoto, Shingo (1482) | Draw 1-1 | 01481 |
| 3standard | 1150 | Iwama, Gaku (1470) | Lost 1-2 | -181463 |
| 4standard | 1227 | Tashima, Kenji (1407) | Won 2-1 | +171480 |
| 5standard | 1054 | Odagiri, Yousuke (1490) | Lost 1-2 | -181462 |
| 6standard | 1123 | Shimura, Yasuhiko (1403) | Draw 1-1 | -11461 |
| 7standard | 1058 | Sarusawa, Yuichi (1397) | Lost 1-2 | -191442 |
| 8standard | 958 | Fujita, Daisuke (1436) | Lost 0-2 | -181424 |
| average opponent: 1444record: 1-5-2 | new rating: 1424 | |||