Jahoda, Petr
Current rating: 1477
Record: 6-8
| Grand Prix Prague 2019 (UMA limited) | starting rating: 1528 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 701 | Gallo, Andrea Gaetano (1486) | Won 2-0 | +171545 |
| 2sealed | 557 | De Vareilles, Leonard (1636) | Lost 0-2 | -161529 |
| 3sealed | 597 | Landgraf, Alexander (1604) | Lost 0-2 | -171512 |
| 4sealed | 996 | Piotrowski, Adam (1556) | Lost 1-2 | -171495 |
| 5sealed | 980 | Gonzalez Munzon, Mario (1470) | Lost 0-2 | -181477 |
| average opponent: 1550record: 1-4 | new rating: 1477 | |||
| Grand Prix Prague 2017 (AER limited) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 67 | Kramer, Bernhard (1502) | Won 2-1 | +181518 |
| 2sealed | 206 | Dumke, Fabian (1518) | Won 2-0 | +181536 |
| 3sealed | 53 | Horvath, Tamas 9788 (1503) | Lost 0-2 | -191517 |
| 4sealed | 634 | Mattioli, Alberto (1851) | Won 2-1 | +241541 |
| 5sealed | 158 | Wache, Paul (1742) | Won 2-0 | +221563 |
| 6sealed | 268 | Marcatti, Mathia (1453) | Lost 1-2 | -201543 |
| 7sealed | 361 | Hrycej, Martin (1804) | Lost 1-2 | -131530 |
| 8sealed | 521 | Schmidt, Matthias (1523) | Won 2-0 | +171547 |
| 9sealed | 360 | Schipper, Nico (1474) | Lost 1-2 | -191528 |
| average opponent: 1597record: 5-4 | new rating: 1528 | |||