Vach, Petr
Current rating: 1520
Record: 8-7
| Grand Prix Prague 2019 (UMA limited) | starting rating: 1550 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 461 | Mika, Jakub (1500) | Lost 1-2 | -191531 |
| 2sealed | 1346 | Kusebauch, Roland (1536) | Won 2-0 | +181549 |
| 3sealed | 954 | Luger, Manuel (1500) | Lost 0-2 | -191530 |
| 4sealed | 1076 | Nosowicz, Karol (1803) | Lost 0-2 | -131517 |
| 5sealed | 937 | Andersen, Henning (1471) | Won 2-0 | +171534 |
| 6sealed | 820 | Kvas, Bojan (1760) | Lost 0-2 | -141520 |
| average opponent: 1595record: 2-4 | new rating: 1520 | |||
| Grand Prix Prague 2009 (M10 limited) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 715 | Obermuller, Florian (1519) | Lost 0-2 | -181482 |
| 2sealed | 811 | Kratena, Ivo (1480) | Won 2-1 | +181500 |
| 3sealed | 722 | Vogel, Alexander (1449) | Lost 0-2 | -191481 |
| 4sealed | 824 | Stangl, Alexander (1400) | Lost 1-2 | -191462 |
| 5sealed | 817 | Vaclavik, Petr (1463) | Won 2-0 | +181480 |
| 6sealed | 736 | Brychta, Jan (1480) | Won 2-0 | +181498 |
| 7sealed | 691 | Rossijcenko, Alexander (1392) | Won 2-0 | +161514 |
| 8sealed | 639 | Simek, Vaclav (1516) | Won 2-1 | +181532 |
| 9sealed | 606 | Cizmic, Nenad (1524) | Won 2-1 | +181550 |
| average opponent: 1469record: 6-3 | new rating: 1550 | |||