Jonas, Jan
Current rating: 1503
Record: 6-6
| Grand Prix Prague 2011 (NPH limited) | starting rating: 1502 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 138 | Kaiser, Ben (1471) | Won 2-1 | +181520 |
| 2sealed | 73 | Matthies, Mario (1548) | Lost 0-2 | -181502 |
| 3sealed | 206 | Gaal, Tamas (1506) | Won 2-1 | +181520 |
| 4sealed | 92 | Chand, Vijay (1588) | Lost 0-2 | -171503 |
| average opponent: 1528record: 2-2 | new rating: 1503 | |||
| Grand Prix Prague 2009 (M10 limited) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 581 | Karlhuber-vockl, Peter (1443) | Won 2-0 | +171517 |
| 2sealed | 555 | Cech, Vit (1562) | Won 2-0 | +191536 |
| 3sealed | 528 | Lefterov, Alexander (1546) | Lost 1-2 | -181518 |
| 4sealed | 636 | Sonnenschein, Benedikt (1632) | Lost 0-2 | -161502 |
| 5sealed | 712 | Hagen, Michiel (1560) | Lost 0-2 | -171485 |
| 6sealed | 738 | Kazmierczak, Slawomir (1486) | Won 2-1 | +181503 |
| 7sealed | 715 | Gabriel, Dana (1500) | Won 2-0 | +181521 |
| 8sealed | 637 | Chernobryvchenko, Mikhail (1476) | Lost 0-2 | -191502 |
| average opponent: 1526record: 4-4 | new rating: 1502 | |||