Kostrzewski, Wiktor
Current rating: 1467
Record: 2-4
| Grand Prix Prague 2017 (AER limited) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 523 | Boruvka, Petr (1713) | Lost 1-2 | -141486 |
| 2sealed | 500 | Kiesel, Kevin (1482) | Won 2-1 | +181504 |
| 3sealed | 556 | Pilichowski, Karol (1509) | Lost 0-2 | -181486 |
| 4sealed | 683 | Horsten, Brent (1434) | Lost 1-2 | -191467 |
| 5sealed | 827 | Barz, Oliver (1473) | Won 2-0 | +181485 |
| 6sealed | 660 | Obradovic, Darko (1461) | Lost 0-2 | -181467 |
| average opponent: 1512record: 2-4 | new rating: 1467 | |||