Kokubun, Manabu
Current rating: 1419
Record: 2-7
| Grand Prix Yokohama 2012 (modern) | starting rating: 1468 | |||
| round | table | opponent (rating) | result | Δrating |
| 1modern | 39 | Nakamura, Taro (1500) | Lost 0-2 | -181450 |
| 2modern | 464 | Hayakawa, Soichi (1480) | Won 2-1 | +191469 |
| 3modern | 577 | Kuwahara, Yoshiki (1537) | Lost 0-2 | -171452 |
| 4modern | 579 | Matsuura, Hiroyuki (1517) | Lost 0-2 | -171435 |
| 5modern | 616 | Saijou, Yuuichi (1499) | Lost 0-2 | -161419 |
| average opponent: 1507record: 1-4 | new rating: 1419 | |||
| Grand Prix Niigata 2009 (M10 limited) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 76 | Nagamine, Toshiki (1500) | Lost 0-2 | -181482 |
| 2sealed | 277 | Kinoshita, Makoto (1483) | Won 2-1 | +181500 |
| 3sealed | 178 | Koyama, Masashi (1497) | Lost 0-2 | -181482 |
| 4sealed | 220 | Kawakami, Hiroshi (1701) | Lost 1-2 | -141468 |
| average opponent: 1545record: 1-3 | new rating: 1468 | |||