Kumagai, Yohei
Current rating: 1495
Record: 6-6
| Grand Prix Chiba 2018 (M19 limited) | starting rating: 1539 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 723 | Taira, Kentaro (1500) | Lost 0-2 | -191520 |
| 2sealed | 935 | Maruyama, Hiroki (1405) | Lost 1-2 | -201500 |
| 3sealed | 1180 | Masuda, Junta (1447) | Won 2-1 | +171517 |
| 4sealed | 1022 | Kikuchi, Takashi (1287) | Lost 0-2 | -221495 |
| average opponent: 1410record: 1-3 | new rating: 1495 | |||
| Grand Prix Chiba 2015 (MM2 limited) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 1089 | Hatori, Masaru (1500) | Won 2-0 | +181518 |
| 2sealed | 1150 | Katayama, Tatuaki (1516) | Won 2-1 | +181536 |
| 3sealed | 1007 | Takaku, Takeshi (1515) | Won 2-0 | +181554 |
| 4sealed | 840 | Sou, Chiriki (1557) | Lost 1-2 | -181536 |
| 5sealed | 1026 | Murai, Tatsuya6290 (1521) | Won 2-1 | +171553 |
| 6sealed | 943 | Fung, Ngan (1657) | Lost 1-2 | -161537 |
| 7sealed | 920 | Miyano, Shinichi (1637) | Won 2-0 | +201557 |
| 8sealed | 866 | Terawaki, Koji (1540) | Lost 1-2 | -181539 |
| average opponent: 1555record: 5-3 | new rating: 1539 | |||