Coka, Petr
Current rating: 1502
Record: 12-12-3
| Grand Prix Heidelberg 2002 (TOR limited) | starting rating: 1542 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 7 | Rueder, Marcel (1500) | Lost 0-2 | -191523 |
| 2sealed | 355 | Zafiris, Nico (1482) | Draw 1-1 | 01523 |
| 3sealed | 321 | Gutmann, Andre (1482) | Won 2-0 | +171540 |
| 4sealed | 246 | Reith, Matthias (1456) | Lost 1-2 | -201520 |
| 5sealed | 282 | Schaller, Johannes (1482) | Lost 0-2 | -181502 |
| top | average opponent: 1480record: 1-3-1 | new rating: 1502 | ||
| Grand Prix Prague 2001 (PLS limited) | starting rating: 1507 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 106 | Zak, Krzysztof (1500) | Won 2-1 | +181525 |
| 2sealed | 21 | Cevela, Pavel (1518) | Draw 1-1 | 01525 |
| 3sealed | 97 | Kolvara, Ladislav (1518) | Won 2-1 | +181543 |
| 4sealed | 58 | Henel, Tomasz (1536) | Lost 1-2 | -181525 |
| 5sealed | 121 | Smirnov, Alexey (1518) | Won 2-1 | +171542 |
| 6sealed | 66 | Sagner, Andreas (1535) | Lost 1-2 | -181524 |
| 7sealed | 110 | Bydzan, Valery (1516) | Draw 1-1 | 01524 |
| 8sealed | 129 | Netrefa, Jiri (1517) | Won 2-1 | +181542 |
| top | average opponent: 1520record: 4-2-2 | new rating: 1542 | ||
| Grand Prix Cologne 2001 (PLS limited) | starting rating: 1464 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 47 | Verstuyft, Bart (1482) | Won 2-1 | +181482 |
| 2sealed | 5 | Demedts, Geert (1520) | Won 2-1 | +191501 |
| 3sealed | 35 | Christensen, Benn (1524) | Won 2-1 | +181519 |
| 4sealed | 7 | Herzog, Nicolai (1772) | Lost 0-2 | -131506 |
| 5sealed | 63 | Vollebregt, Joost (1501) | Lost 0-1 | -181488 |
| 6sealed | 76 | Hopfner, Christian (1518) | Won 2-1 | +181506 |
| 7sealed | 53 | Horecki, Tomek Goral (1521) | Won 2-0 | +181524 |
| 8sealed | 66 | Siron, Geoffrey (1561) | Lost 0-2 | -171507 |
| top | average opponent: 1550record: 5-3 | new rating: 1507 | ||
| Grand Prix Vienna 1999 (extended) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1extended | 130 | Skrbec, Ziga (1500) | Lost 0-0 | -181482 |
| 2extended | 116 | Cech, Vit (1482) | Won 0-0 | +181500 |
| 3extended | 112 | Matousek, Pavel (1482) | Lost 0-0 | -181482 |
| 4extended | 151 | Schraut, Andreas (1516) | Won 0-0 | +181500 |
| 5extended | 110 | Shvartsman, Alex (1534) | Lost 0-0 | -171483 |
| 6extended | 121 | Peter, Michael (1417) | Lost 0-0 | -191464 |
| top | average opponent: 1488record: 2-4 | new rating: 1464 | ||