Piskorek, Marek
Current rating: 1512
Record: 6-6
| Grand Prix Prague 2019 (UMA limited) | starting rating: 1534 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 1146 | Lursen, Mees (1500) | Lost 1-2 | -191515 |
| 2sealed | 1381 | Zyga, Marcin (1467) | Lost 1-2 | -191496 |
| 3sealed | 1112 | Winkler, Simon (1480) | Lost 1-2 | -181478 |
| 4sealed | 1110 | Raubal, Stefan (1362) | Won 2-1 | +161494 |
| 5sealed | 977 | Larsen, Asger (1469) | Won 2-0 | +181512 |
| average opponent: 1456record: 2-3 | new rating: 1512 | |||
| Grand Prix Brussels 2018 (M19 standard) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1standard | 56 | De Coster, Bjorn (1500) | Won 2-0 | +181518 |
| 2standard | 9 | Plaksiychuk, Denis (1434) | Won 2-1 | +161534 |
| 3standard | 5 | Reiter, Vincent (1742) | Won 2-1 | +221556 |
| 4standard | 51 | Boussaud, Eliott (1943) | Won 2-1 | +251581 |
| 5standard | 34 | Mechin, Thomas (1755) | Lost 0-2 | -151566 |
| 6standard | 76 | Whyte, Ailsa (1462) | Lost 0-2 | -201546 |
| 7standard | 234 | Channing, George (1877) | Lost 0-2 | -121534 |
| average opponent: 1673record: 4-3 | new rating: 1534 | |||