Kumazaki, Ken
Current rating: 1400
Record: 1-7
| Grand Prix Shizuoka 2017 (AER standard) | starting rating: 1444 | |||
| round | table | opponent (rating) | result | Δrating |
| 1standard | 186 | Shibazaki, Toma (1500) | Won 2-0 | +191463 |
| 2standard | 423 | Nii, Shota (1518) | Lost 1-2 | -171446 |
| 3standard | 1007 | Mukasa, Yoshiya (1488) | Lost 1-2 | -171429 |
| 4standard | 931 | Hasegawa, Ryota (1469) | Lost 1-2 | -171412 |
| 5standard | 1102 | Kirito, Keisuke (1732) | Lost 0-2 | -121400 |
| average opponent: 1541record: 1-4 | new rating: 1400 | |||
| Grand Prix Kobe 2015 (BFZ standard) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1standard | 564 | Nishmura, Yukitaka (1485) | Lost 0-2 | -181482 |
| 2standard | 809 | Yamanaka, Takuya (1565) | Lost 0-2 | -171465 |
| 3standard | 1200 | Yuki, Ryosuke (1307) | Lost 1-2 | -211444 |
| average opponent: 1452record: 0-3 | new rating: 1444 | |||