Petersen, William
Current rating: 1539
Record: 8-7
| Grand Prix Warsaw 2018 (GRN limited) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 285 | Kroll, Jacques (1500) | Won 2-1 | +181518 |
| 2sealed | 70 | Mylonas, Alexis (1545) | Won 2-0 | +181536 |
| 3sealed | 283 | Dimitropoulos, Konstantinos (1701) | Won 2-0 | +211557 |
| 4sealed | 160 | van Donselaar, Philip (1689) | Lost 1-2 | -151542 |
| 5sealed | 258 | Tzamouranis, Chronis (1538) | Won 2-0 | +181560 |
| 6sealed | 229 | Solomon, Sorin (1582) | Lost 1-2 | -181542 |
| 7sealed | 178 | Famiani, Guglielmo (1726) | Won 2-1 | +211563 |
| 8sealed | 276 | Lechner, Christian (1809) | Won 2-1 | +231586 |
| 9sealed | 148 | Meinhardt, Sebastian (1536) | Won 2-1 | +171603 |
| 10draft | 314 | Lindeman, Lennart (1714) | Lost 0-2 | -161587 |
| 11draft | 364 | Farkas, Andrej (1582) | Lost 0-2 | -181569 |
| 12draft | 326 | Sommen, Pierre (1891) | Lost 0-2 | -121557 |
| 13draft | 353 | Garczynski, Marcin (1542) | Lost 0-2 | -191538 |
| 14draft | 346 | Tzelepis, Stavros (1523) | Won 2-1 | +181556 |
| 15draft | 272 | Kalaydzhiev, Emil (1633) | Lost 0-2 | -171539 |
| average opponent: 1634record: 8-7 | new rating: 1539 | |||