Ishizaka, Naoki
Current rating: 1519
Record: 6-5-1
| Grand Prix Shizuoka 2015 (KTK limited) | starting rating: 1481 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 357 | Yoshida, Akihiko (1575) | Lost 1-2 | -161465 |
| 2sealed | 303 | Noto, Yoshinari (1482) | Draw 1-1 | 01465 |
| 3sealed | 453 | Ookura, Haruka (1482) | Won 2-0 | +191484 |
| 4sealed | 341 | Mizukoshi, Hideyuki (1500) | Won 2-1 | +181502 |
| 5sealed | 231 | Mitsuyasu, Hidetoshi (1531) | Won 2-0 | +191521 |
| 6sealed | 144 | Kawa, Hirokazu (1483) | Won 2-1 | +171538 |
| 7sealed | 92 | Kodera, Yasunori (1498) | Lost 1-2 | -191519 |
| average opponent: 1507record: 4-2-1 | new rating: 1519 | |||
| Grand Prix Shizuoka 2013 (THS standard) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1standard | 583 | Schiber, Christopher (1550) | Won 2-0 | +191519 |
| 2standard | 645 | Sakai, Hiroetsu (1500) | Lost 1-2 | -181501 |
| 3standard | 767 | Ueki, Junichi (1416) | Lost 1-2 | -201481 |
| 4standard | 860 | Dapat, Clyde (1368) | Won 2-0 | +161497 |
| 5standard | 768 | Hibino, Yasutaka (1632) | Lost 1-2 | -161481 |
| average opponent: 1493record: 2-3 | new rating: 1481 | |||