Ookubo, Akio
Current rating: 1486
Record: 2-3
| Grand Prix Kitakyushu 2009 (ZEN limited) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 62 | Hisaki, Yuu (1511) | Lost 0-2 | -181482 |
| 2sealed | 177 | Togawa, Tanichirou (1486) | Won 2-1 | +181500 |
| 3sealed | 162 | Nakamura, Yuuki (1678) | Won 2-1 | +211521 |
| 4sealed | 93 | Kamizono, Naoki (1468) | Lost 0-2 | -181503 |
| 5sealed | 172 | Ashikaga, Masatoshi (1570) | Lost 1-2 | -171486 |
| average opponent: 1543record: 2-3 | new rating: 1486 | |||