Oba, Akihiro
Current rating: 1510
| Grand Prix Chiba 2018 (M19 limited) | starting rating: 1527 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 391 | Nashimoto, Masahiro (1450) | Lost 0-2 | -191508 |
| 2sealed | 738 | Tsunoda, Yotaro (1338) | Won 2-0 | +141522 |
| 3sealed | 992 | Sakai, Toshinori (1706) | Won 2-0 | +221544 |
| 4sealed | 414 | Matsubara, Tohru (1733) | Lost 0-2 | -151529 |
| 5sealed | 899 | Muto, Takeshi (1470) | Lost 1-2 | -191510 |
| top | average opponent: 1539record: 2-3 | new rating: 1510 | ||
| Grand Prix Chiba 2016 (legacy) | starting rating: 1520 | |||
| round | table | opponent (rating) | result | Δrating |
| 1legacy | 733 | Monjiyama, Daisuke (1534) | Draw 1-1 | +11521 |
| 2legacy | 512 | Nishimura, Yuki (1435) | Won 2-1 | +161537 |
| 3legacy | 591 | Tsutsui, Yuki (1680) | Won 2-0 | +211558 |
| 4legacy | 315 | Harane, Kenta (1904) | Lost 0-2 | -121546 |
| 5legacy | 542 | Ootubo, Toshihiro (1483) | Won 2-1 | +171563 |
| 6legacy | 341 | Nakada, Ryo (1628) | Lost 1-2 | -171546 |
| 7legacy | 548 | Netsu, Tomoyuki (1502) | Lost 0-2 | -191527 |
| top | average opponent: 1595record: 3-3-1 | new rating: 1527 | ||
| Grand Prix Chiba 2015 (MM2 limited) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 1087 | Oobayashi, Naoki (1473) | Won 2-0 | +181518 |
| 2sealed | 1067 | Ikeda, Takeaki (1456) | Won 2-1 | +161534 |
| 3sealed | 849 | Kihara, Atsuki (1753) | Lost 0-2 | -141520 |
| top | average opponent: 1560record: 2-1 | new rating: 1520 | ||