Houzvicka, Jaroslav
Current rating: 1378
| Grand Prix Prague 2009 (M10 limited) | starting rating: 1386 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 686 | Cillik, Karol (1549) | Won 2-0 | +211407 |
| 2sealed | 576 | Trushin, Kirill (1473) | Lost 0-2 | -171390 |
| 3sealed | 678 | Pazitnaj, Adam (1501) | Lost 1-2 | -161374 |
| 4sealed | 826 | Stefanak, Filip (1480) | Won 2-0 | +201394 |
| 5sealed | 724 | Kesminaite, Aiste (1523) | Lost 1-2 | -161378 |
| top | average opponent: 1505record: 2-3 | new rating: 1378 | ||
| Grand Prix Vienna 2008 (extended) | starting rating: 1431 | |||
| round | table | opponent (rating) | result | Δrating |
| 1extended | 28 | Grimmer, Jasper (1500) | Lost 0-2 | -161415 |
| 2extended | 215 | Kappel, Stefan (1430) | Lost 1-2 | -181397 |
| 3extended | 219 | Huke, Lothar (1463) | Won 2-0 | +191416 |
| 4extended | 224 | Hucik, Tomas (1483) | Lost 0-2 | -171399 |
| 5extended | 239 | Kozanek, Martin (1467) | Won 2-0 | +201419 |
| 6extended | 186 | Bochert, Kai (1497) | Lost 1-2 | -171402 |
| 7extended | 171 | Schouppe, Ewald (1395) | Lost 1-2 | -181384 |
| 8extended | 155 | Pajuelo, Albert (1445) | Won 2-0 | +191403 |
| 9extended | 131 | Dumitru, Radu (1463) | Lost 1-2 | -171386 |
| top | average opponent: 1460record: 3-6 | new rating: 1386 | ||
| Grand Prix Krakow 2007 (LRW standard) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1standard | 572 | Urbanavicius, Gytis (1500) | Lost 0-2 | -181482 |
| 2standard | 631 | Kruzic, Stanko (1499) | Lost 0-2 | -181464 |
| 3standard | 679 | Kaksa, Matija (1464) | Lost 0-2 | -181446 |
| 4standard | 709 | Kauric, Jakov (1446) | Won 2-1 | +181464 |
| 5standard | 672 | Tochacek, Daniel (1490) | Lost 0-2 | -171447 |
| 6standard | 672 | Choinski, Michal Jerzy (1446) | Won 2-0 | +181465 |
| 7standard | 656 | Lebeda, Jiri (1606) | Lost 1-2 | -161449 |
| 8standard | 634 | Kobliha, Jan (1448) | Lost 0-2 | -181431 |
| top | average opponent: 1487record: 2-6 | new rating: 1431 | ||