Petak, Tamas
Current rating: 1486
Record: 4-5
| Grand Prix Prague 2011 (NPH limited) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 200 | Estelberger, Christopher (1430) | Lost 1-2 | -191481 |
| 2sealed | 190 | Helbik, Marek (1478) | Won 2-0 | +181499 |
| 3sealed | 147 | Jandrasits, Marco (1556) | Lost 0-2 | -171482 |
| 4sealed | 209 | Klumpp, Berthold (1665) | Won 2-1 | +211503 |
| 5sealed | 148 | Potuznik, Lukas (1560) | Lost 0-2 | -171486 |
| 6sealed | 188 | Hardstam, Johan (1553) | Lost 0-2 | -171469 |
| 7sealed | 164 | Janovsky, David (1384) | Won 2-1 | +171486 |
| 8sealed | 118 | Hanousek, Tomas 2 (1484) | Won 2-0 | +181504 |
| 9sealed | 99 | Matoska, Martin (1502) | Lost 0-2 | -181486 |
| average opponent: 1512record: 4-5 | new rating: 1486 | |||