Sobiech, Piotr
Current rating: 1439
Record: 4-8-1
| Grand Prix Warsaw 2018 (GRN limited) | starting rating: 1446 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 493 | Fraguas Alegria, Adrian (1336) | Won 2-0 | +161462 |
| 2sealed | 387 | Buszkiewicz, Marek (1560) | Lost 0-2 | -161446 |
| 3sealed | 585 | Jurkonis, Haroldas (1499) | Won 2-1 | +191465 |
| 4sealed | 317 | Ward, Peter (1856) | Lost 0-2 | -121453 |
| 5sealed | 462 | Cathalifaud, Diego (1629) | Lost 1-2 | -141439 |
| average opponent: 1576record: 2-3 | new rating: 1439 | |||
| Grand Prix Prague 2017 (AER limited) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 429 | Matamoros, Patrick (1500) | Lost 1-2 | -181482 |
| 2sealed | 607 | Nahlovsky, Jiri (1420) | Won 2-0 | +171499 |
| 3sealed | 765 | Baumert, Martin (1806) | Draw 1-1 | +51504 |
| 4sealed | 657 | Caffiaux, Benoit (1521) | Lost 0-2 | -171487 |
| 5sealed | 769 | Esselborn, Leon (1485) | Won 2-1 | +181505 |
| 6sealed | 611 | Achim, Cosmin (1363) | Lost 1-2 | -211484 |
| 7sealed | 677 | Lutz, Manuel (1388) | Lost 0-1 | -201464 |
| 8sealed | 655 | Hardubej, Eduard (1447) | Lost 1-2 | -181446 |
| average opponent: 1491record: 2-5-1 | new rating: 1446 | |||