Yamazaki, Sumio
Current rating: 1429
Record: 5-9
| Grand Prix Chiba 2019 (M20 limited) | starting rating: 1464 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 563 | Shigemasa, Gaku (1632) | Won 2-1 | +211485 |
| 2sealed | 452 | Matsuura, Gen (1463) | Lost 0-2 | -191466 |
| 3sealed | 584 | Kobayashi, Hironori (1442) | Lost 0-2 | -181448 |
| 4sealed | 986 | Yuasa, Kentarou (1468) | Lost 0-2 | -181430 |
| 5sealed | 867 | Wachigai, Hirotaka (1344) | Lost 0-2 | -191411 |
| 6sealed | 786 | Yokota, Masaaki (1437) | Won 2-0 | +181429 |
| 7sealed | 634 | Nakamoto, Takahiro (1388) | Lost 0-2 | -191410 |
| 8sealed | 533 | Nakazato, Yuta (1449) | Won 2-0 | +191429 |
| average opponent: 1453record: 3-5 | new rating: 1429 | |||
| Grand Prix Chiba 2015 (MM2 limited) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 951 | Ooshima, Kazuyasu (1517) | Lost 0-2 | -181482 |
| 2sealed | 1384 | Fujita, Yoshito (1481) | Lost 0-2 | -181464 |
| 3sealed | 1323 | Yokota, Kazuya (1452) | Lost 0-2 | -181446 |
| 4sealed | 1281 | Dorfmann, Matthew (1445) | Won 2-0 | +181464 |
| 5sealed | 1211 | Osida, Takao (1482) | Won 1-0 | +181482 |
| 6sealed | 1139 | Aida, Kazuki (1436) | Lost 0-2 | -181464 |
| average opponent: 1469record: 2-4 | new rating: 1464 | |||