Ishizuka, Katsuya
Current rating: 1471
Record: 7-9
| Grand Prix Yokohama 2019 (modern) | starting rating: 1428 | |||
| round | table | opponent (rating) | result | Δrating |
| 1modern | 416 | Kawabata, Shou8056 (1515) | Won 2-1 | +191447 |
| 2modern | 394 | Takagi, Kenji (1476) | Lost 1-2 | -171430 |
| 3modern | 1023 | Enatsu, Hiroaki (1501) | Won 2-1 | +191449 |
| 4modern | 690 | Kondo, Yusuke (1428) | Lost 1-2 | -181431 |
| 5modern | 751 | Hanada, Keisuke (1453) | Won 2-0 | +181449 |
| 6modern | 459 | Taniguchi, Hironobu (1528) | Won 2-1 | +201469 |
| 7modern | 411 | Soyama, Tomohiro (1465) | Won 2-0 | +181487 |
| 8modern | 274 | Matsuda, Issui (1600) | Lost 0-2 | -161471 |
| average opponent: 1496record: 5-3 | new rating: 1471 | |||
| Grand Prix Shizuoka 2018 (legacy) (legacy) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1legacy | 412 | Katou, Masaya (1556) | Won 2-0 | +191519 |
| 2legacy | 211 | Fujikura, Akinori (1685) | Lost 1-2 | -151504 |
| 3legacy | 464 | Kabe, Naoyuki (1359) | Lost 0-2 | -211483 |
| 4legacy | 479 | Yanai, Ryosaku (1388) | Lost 1-2 | -191464 |
| 5legacy | 585 | Nakamura, Masashi (1486) | Lost 0-2 | -181446 |
| 6legacy | 571 | Kawakami, Yuuta (1427) | Lost 1-2 | -181428 |
| 7legacy | 501 | Hoshikawa, Kazuya (1433) | Won 2-0 | +181446 |
| 8legacy | 421 | Hirata, Kiyohide (1440) | Lost 1-2 | -181428 |
| average opponent: 1472record: 2-6 | new rating: 1428 | |||