Kokubo, Kazuhiro
Current rating: 1488
| Grand Prix Shizuoka 2015 (KTK limited) | starting rating: 1526 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 351 | Nagahashi, Sadaaki (1560) | Lost 0-2 | -181508 |
| 2sealed | 361 | Suzuki, Shogo (1383) | Lost 1-2 | -201488 |
| top | average opponent: 1471record: 0-2 | new rating: 1488 | ||
| Grand Prix Nagoya 2014 (BNG limited) | starting rating: 1564 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 630 | Tamura, Youhei (1510) | Lost 1-2 | -191545 |
| 2sealed | 744 | Imai, Kimio (1489) | Lost 0-2 | -191526 |
| top | average opponent: 1500record: 0-2 | new rating: 1526 | ||
| Grand Prix Kitakyushu 2013 (M14 standard) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1standard | 208 | Kusumoto, Masahiro (1405) | Won 2-1 | +161516 |
| 2standard | 256 | Ishii, Ryou (1501) | Won 2-0 | +181534 |
| 3standard | 171 | Kageyama, Hiroki (1485) | Lost 0-2 | -191515 |
| 4standard | 298 | Iwamoto, Nobuyuki (1629) | Won 2-0 | +201535 |
| 5standard | 228 | Shiomi, Mitsuo (1541) | Lost 1-2 | -181517 |
| 6standard | 334 | Shiota, Fumihiko (1770) | Won 2-0 | +231540 |
| 7standard | 169 | Morita, Yo (1566) | Won 2-0 | +181558 |
| 8standard | 75 | Tsuba, Yuuki (1620) | Won 2-1 | +191577 |
| 9standard | 98 | Shimizu, Naoki (1817) | Lost 1-2 | -131564 |
| top | average opponent: 1593record: 6-3 | new rating: 1564 | ||