Ishizaki, Hiroshi
Current rating: 1517
Record: 4-3
| Grand Prix Chiba 2019 (M20 limited) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 520 | Toshida, Shin'ichi (1386) | Won 2-0 | +161516 |
| 2sealed | 223 | Doyama, Hayate (1499) | Won 2-0 | +181534 |
| 3sealed | 493 | Ushio, Atsushi (1747) | Lost 1-2 | -151519 |
| 4sealed | 490 | Aizawa, Tamotsu (1687) | Lost 0-2 | -151504 |
| 5sealed | 768 | Suzuki, Tatsuya (1321) | Won 2-0 | +151519 |
| 6sealed | 365 | Hidaka, Takuya (1385) | Won 2-1 | +161535 |
| 7sealed | 271 | Takino, Shohei (1538) | Lost 1-2 | -181517 |
| average opponent: 1509record: 4-3 | new rating: 1517 | |||