Ishizuka, Kazuyuki
Current rating: 1483
| Grand Prix Yokohama 2013 (GTC limited) | starting rating: 1499 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 795 | Mizutani, Yuki (1357) | Lost 1-2 | -201479 |
| 2sealed | 969 | Sasaki, Takehito (1481) | Won 2-1 | +181497 |
| 3sealed | 881 | Aryabhima, Rahman (1737) | Lost 1-2 | -141483 |
| top | average opponent: 1525record: 1-2 | new rating: 1483 | ||
| Grand Prix Nagoya 2012 (RTR standard) | starting rating: 1520 | |||
| round | table | opponent (rating) | result | Δrating |
| 1standard | 409 | Doi, Kazumine (1500) | Lost 0-2 | -181502 |
| 2standard | 644 | Jinno, Tatsuya (1482) | Won 2-1 | +171519 |
| 3standard | 385 | Kawada, Yuta (1500) | Won 1-0 | +181537 |
| 4standard | 283 | Yagi, Koutarou (1524) | Lost 0-2 | -181519 |
| 5standard | 453 | Ootsuki, Yoshihiko (1437) | Draw 1-1 | -21517 |
| 6standard | 504 | Inoue, Shinta (1534) | Lost 0-2 | -181499 |
| top | average opponent: 1496record: 2-3-1 | new rating: 1499 | ||
| Grand Prix Yokohama 2012 (modern) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1modern | 103 | McClain, Stephen (1500) | Won 2-1 | +181518 |
| 2modern | 376 | Kira, Ryouichi (1500) | Won 2-1 | +181536 |
| 3modern | 230 | Omori, Wataru (1505) | Won 2-1 | +171553 |
| 4modern | 126 | Sasaki, Yuusuke (Hyogo) (1748) | Lost 1-2 | -141539 |
| 5modern | 200 | Hozumi, Masashi (1483) | Lost 1-2 | -191520 |
| 6modern | 291 | Katagiri, Shinichi (1612) | Lost 0-2 | -171503 |
| 7modern | 405 | Yokomizo, Gouki (1431) | Won 2-0 | +171520 |
| top | average opponent: 1540record: 4-3 | new rating: 1520 | ||