Kobierski, Piotr
Current rating: 1486
Record: 4-5
| Grand Prix Prague 2011 (NPH limited) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 8 | Mares, Josef (1373) | Lost 1-2 | -201480 |
| 2sealed | 195 | Wielgorski, Daniel (1390) | Won 2-0 | +161496 |
| 3sealed | 168 | Jirasek, David (1501) | Won 2-1 | +181514 |
| 4sealed | 131 | Gemov, Martin (1539) | Lost 1-2 | -171497 |
| 5sealed | 187 | Michels, Tim (1680) | Lost 1-2 | -151482 |
| 6sealed | 191 | Maier, Jordan (1633) | Lost 0-2 | -151467 |
| 7sealed | 171 | Kamenov, Kamen (1469) | Lost 1-2 | -181449 |
| 8sealed | 135 | Maricak, Milan (1446) | Won 2-0 | +181467 |
| 9sealed | 107 | Pietkiewicz, Szymon (1520) | Won 2-0 | +191486 |
| average opponent: 1506record: 4-5 | new rating: 1486 | |||