Biernacki, Piotr
Current rating: 1419
Record: 4-9
| Grand Prix Brussels 2020 (pioneer) | starting rating: 1446 | |||
| round | table | opponent (rating) | result | Δrating |
| 1pioneer | 211 | Van Der Krieken, Robin (1500) | Lost 0-2 | -171429 |
| 2pioneer | 573 | Friedrichs, Sandra (1484) | Won 2-1 | +191448 |
| 3pioneer | 492 | Jakobsmeyer, Tim (1579) | Lost 0-2 | -161432 |
| 4pioneer | 612 | Mandel, Taavi (1474) | Won 2-1 | +191451 |
| 5pioneer | 547 | Corral, David (1578) | Lost 0-2 | -161435 |
| 6pioneer | 536 | Caligaris, Alessandro (1438) | Won 2-0 | +181453 |
| 7pioneer | 445 | Klein, Alexander (1582) | Lost 0-2 | -151438 |
| 8pioneer | 373 | Gainetdinoff, Aurelien (1407) | Lost 1-2 | -191419 |
| average opponent: 1505record: 3-5 | new rating: 1419 | |||
| Grand Prix Birmingham 2018 (std) (DOM standard) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1standard | 85 | Smith, Richard (1567) | Lost 0-2 | -171483 |
| 2standard | 371 | Williams, Alex [ENG] (1484) | Lost 1-2 | -181465 |
| 3standard | 510 | Bainbridge, Simon (1451) | Lost 0-2 | -181447 |
| 4standard | 523 | Cook, Jude (1472) | Lost 0-2 | -181429 |
| 5standard | 503 | Gordon, Daniel (1337) | Won 2-1 | +171446 |
| average opponent: 1462record: 1-4 | new rating: 1446 | |||