Mayumi, Tomohito
Current rating: 1464
Record: 3-5
| Grand Prix Chiba 2019 (M20 limited) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 540 | Takahashi, Hidekazu (1500) | Lost 0-2 | -181482 |
| 2sealed | 696 | Mikami, Takehiro (1486) | Won 2-0 | +181500 |
| 3sealed | 715 | Fujii, Takehiro (1576) | Lost 1-2 | -171483 |
| 4sealed | 799 | Iiduka, Kazuhiko (1481) | Lost 0-2 | -181465 |
| 5sealed | 909 | Furukawa, Takuto (1377) | Won 2-0 | +171482 |
| 6sealed | 703 | Obata, Ken (1541) | Won 2-0 | +191501 |
| 7sealed | 586 | Miyamoto, Naoki (1463) | Lost 1-2 | -191482 |
| 8sealed | 507 | Awane, Hiroyuki (1455) | Lost 1-2 | -181464 |
| average opponent: 1485record: 3-5 | new rating: 1464 | |||