Ishimaru, Naoki
Current rating: 1442
| Grand Prix Shizuoka 2018 (legacy) (legacy) | starting rating: 1473 | |||
| round | table | opponent (rating) | result | Δrating |
| 1legacy | 280 | Koga, Ichiro (1500) | Won 2-1 | +181491 |
| 2legacy | 167 | Imanishi, Eiji (1630) | Lost 1-2 | -151476 |
| 3legacy | 351 | Takano, Ryouta (1503) | Lost 0-2 | -181458 |
| 4legacy | 530 | Matsushita, Masayoshi (1538) | Lost 0-2 | -161442 |
| top | average opponent: 1543record: 1-3 | new rating: 1442 | ||
| Grand Prix Kobe 2017 (modern) | starting rating: 1487 | |||
| round | table | opponent (rating) | result | Δrating |
| 1modern | 445 | Suzuki, Takuya 1104 (1500) | Won 2-0 | +181505 |
| 2modern | 466 | Inoue, Yusuke (1571) | Won 2-1 | +201525 |
| 3modern | 79 | Iwasaki, Mitsumasa (1542) | Lost 1-2 | -181507 |
| 4modern | 508 | Shoji, Kenta (1622) | Lost 0-2 | -161491 |
| 5modern | 769 | Fukuda, Naoki (1507) | Lost 0-2 | -181473 |
| 6modern | 1052 | Kurano, Motoki (1491) | Won 2-0 | +191492 |
| 7modern | 832 | Ebara, Satoshi (1439) | Lost 1-2 | -191473 |
| top | average opponent: 1525record: 3-4 | new rating: 1473 | ||
| Grand Prix Chiba 2016 (legacy) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1legacy | 241 | Karibe, Ryutaro (1495) | Lost 0-2 | -181482 |
| 2legacy | 709 | Kobayashi, Masahiro (1405) | Won 2-1 | +171499 |
| 3legacy | 776 | Iwasaki, Atsushi (1500) | Won 2-1 | +181517 |
| 4legacy | 377 | Sakai, Toshinori (1631) | Lost 1-2 | -161501 |
| 5legacy | 599 | Okada, Wataru (1818) | Won 2-0 | +231524 |
| 6legacy | 378 | Sekikawa, Daichi (1539) | Lost 0-2 | -181506 |
| 7legacy | 701 | Nishimura, Koichi (1430) | Lost 1-2 | -191487 |
| top | average opponent: 1545record: 3-4 | new rating: 1487 | ||