Petrak, Martin
Current rating: 1542
Record: 41-41
| Grand Prix Krakow 2019 (M20 limited) | starting rating: 1604 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 518 | Tang, Rasmus (1585) | Lost 0-2 | -181586 |
| 2sealed | 587 | Bedynski, Adam (1505) | Won 2-0 | +161602 |
| 3sealed | 311 | Chovin, Mathieu (1503) | Lost 1-2 | -191583 |
| 4sealed | 334 | Buscaglia, Francesco (1433) | Lost 0-2 | -211562 |
| 5sealed | 367 | Kawalec, Jiri (1466) | Lost 0-2 | -201542 |
| top | average opponent: 1498record: 1-4 | new rating: 1542 | ||
| Grand Prix Warsaw 2018 (GRN limited) | starting rating: 1674 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 98 | Durma, Cezary (1500) | Won 2-1 | +151689 |
| 2sealed | 181 | Jekot, Marcin (1464) | Lost 0-2 | -221667 |
| 3sealed | 471 | Oriez, Etienne (1452) | Lost 1-2 | -221645 |
| 4sealed | 729 | Olejarski, Jakub (1479) | Lost 0-2 | -211624 |
| 5sealed | 757 | Tarnowski, Rafal (1520) | Lost 0-2 | -201604 |
| top | average opponent: 1483record: 1-4 | new rating: 1604 | ||
| Grand Prix Milan 2014 (JOU limited) | starting rating: 1659 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 24 | Ryding, Erik (1546) | Won 2-1 | +161675 |
| 2sealed | 35 | Di Cesare, Marco (1519) | Won 2-0 | +151690 |
| 3sealed | 110 | Beltramo, Luca (1401) | Won 2-0 | +131703 |
| 4sealed | 57 | Lehner, Bernhard (2038) | Won 2-1 | +241727 |
| 5sealed | 10 | Johnson, Courtney (1643) | Lost 1-2 | -191708 |
| 6sealed | 121 | Krauer, Florian (1810) | Lost 0-2 | -171691 |
| 7sealed | 218 | Angelin, Marcus (1730) | Lost 0-2 | -171674 |
| top | average opponent: 1669record: 4-3 | new rating: 1674 | ||
| Grand Prix Vienna 2014 (BNG limited) | starting rating: 1581 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 100 | Gierlinger, Simon (1500) | Won 2-0 | +161597 |
| 2sealed | 100 | Deloly, Mathieu (1768) | Won 2-1 | +211618 |
| 3sealed | 32 | Marino, Jan Marc (1552) | Lost 1-2 | -191599 |
| 4sealed | 304 | Luthje, Benjamin (1667) | Won 2-0 | +191618 |
| 5sealed | 81 | Kern, Oliver (1420) | Won 2-1 | +151633 |
| 6sealed | 48 | Paskov, Dobrin (1550) | Won 2-0 | +161649 |
| 7sealed | 49 | Preiml, Stefan (1562) | Won 2-1 | +171666 |
| 8sealed | 16 | Golubkin, Sergey (1696) | Lost 0-2 | -181648 |
| 9sealed | 215 | Rade, Olle (1818) | Won 2-0 | +211669 |
| 10draft | 36 | Bayer, Jonas (1636) | Lost 1-2 | -181651 |
| 12draft | 52 | Penko, Matic (1775) | Won 2-0 | +201671 |
| 13draft | 11 | Jensen, Thomas Dall (1699) | Lost 0-2 | -181653 |
| 14draft | 36 | Vieren, Pascal (1843) | Lost 1-2 | -141639 |
| 15draft | 12 | Berze, Richard (1769) | Won 2-1 | +201659 |
| top | average opponent: 1661record: 9-5 | new rating: 1659 | ||
| Grand Prix Prague 2013 (M14 limited) | starting rating: 1477 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 235 | De Pauw, Stijn (1530) | Won 2-0 | +191496 |
| 2sealed | 93 | Kubinec, Ales (1518) | Won 2-1 | +181514 |
| 3sealed | 54 | Leitner, Benjamin (1748) | Won 2-0 | +221536 |
| 4sealed | 125 | Plisov, Oleg (1710) | Won 2-1 | +211557 |
| 5sealed | 28 | Casadei, Luca (1813) | Lost 0-2 | -131544 |
| 6sealed | 184 | Schmidt, Jan (1645) | Lost 1-2 | -161528 |
| 7sealed | 174 | Darras, Alexandre (1661) | Won 2-0 | +201548 |
| 8sealed | 233 | Terrasse, Nicolas (1566) | Won 2-0 | +181566 |
| 9sealed | 122 | Estratti, Samuele (1904) | Won 2-1 | +241590 |
| 10draft | 27 | Kopp, Bastian (1570) | Won 2-1 | +181608 |
| 11draft | 46 | Salvade, Luca (1648) | Lost 1-2 | -171591 |
| 12draft | 98 | Heinemann, Stefan (1505) | Won 2-0 | +161607 |
| 13draft | 89 | Canavesi, Daniele (1801) | Lost 1-2 | -141593 |
| 14draft | 78 | Grafensteiner, Daniel (1940) | Lost 1-2 | -121581 |
| top | average opponent: 1683record: 9-5 | new rating: 1581 | ||
| Grand Prix Lisbon 2012 (RTR limited) | starting rating: 1462 | |||
| round | table | opponent (rating) | result | Δrating |
| 2sealed | 107 | Boavida, Pedro (1463) | Lost 0-2 | -181444 |
| 3sealed | 198 | Rico Bleda, Alejandro (1746) | Won 2-0 | +231467 |
| 4sealed | 192 | Simoes, Duarte (1519) | Won 2-1 | +191486 |
| 5sealed | 64 | Vanedal, Ida Thune (1481) | Won 2-1 | +181504 |
| 6sealed | 46 | Mankovs, Dmitrijs (1554) | Lost 0-2 | -171487 |
| 7sealed | 68 | Luis, Manuel (1640) | Lost 1-2 | -151472 |
| 8sealed | 146 | Loucao, Ricardo (1536) | Won 2-0 | +191491 |
| 9sealed | 75 | Posadas Barrios, David (1698) | Lost 1-2 | -141477 |
| top | average opponent: 1580record: 4-4 | new rating: 1477 | ||
| Grand Prix Manchester 2012 (DKA limited) | starting rating: 1471 | |||
| round | table | opponent (rating) | result | Δrating |
| 2sealed | 55 | Lembregts, Koen (1518) | Lost 1-2 | -171454 |
| 3sealed | 112 | Merritt, Daniel (1506) | Won 2-1 | +191473 |
| 4sealed | 99 | Hancock, David (1518) | Lost 1-2 | -181455 |
| 5sealed | 140 | Nuttall, Daniel (1510) | Lost 0-2 | -171438 |
| 7sealed | 148 | Winand, Tomas (1624) | Won 2-1 | +221460 |
| 8sealed | 105 | Marshall, Simon (1512) | Lost 0-2 | -171443 |
| 9sealed | 98 | O'Reilly, Paul (1503) | Won 2-0 | +191462 |
| top | average opponent: 1527record: 3-4 | new rating: 1462 | ||
| Grand Prix Prague 2011 (NPH limited) | starting rating: 1508 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 67 | [anonymous] | Won 2-0 | +181526 |
| 2sealed | 154 | Tzortzis, Tasos (1484) | Lost 1-2 | -191507 |
| 3sealed | 205 | Stejskal, Jindrich (1502) | Lost 1-2 | -181489 |
| 4sealed | 263 | Springer, Erik (1482) | Lost 0-2 | -181471 |
| top | average opponent: 1487record: 1-3 | new rating: 1471 | ||
| Grand Prix Vienna 2008 (extended) | starting rating: 1526 | |||
| round | table | opponent (rating) | result | Δrating |
| 1extended | 149 | Vasickova, Sona (1500) | Won 2-1 | +181544 |
| 2extended | 21 | Kirilov, Kaloyan (1445) | Lost 0-2 | -201524 |
| 3extended | 173 | Hinterdorfer, Clemens (1497) | Lost 1-2 | -181506 |
| 4extended | 217 | Savic, Tomislav (1464) | Won 2-0 | +171523 |
| 5extended | 186 | Spitzenstatter, Daniel (1500) | Won 2-1 | +171540 |
| 6extended | 145 | Levy, Raphael (1902) | Lost 1-2 | -111529 |
| 7extended | 164 | Preusche, Florian (1503) | Won 2-0 | +171546 |
| 8extended | 124 | De La Iglesia, David (1460) | Lost 1-2 | -191527 |
| 9extended | 121 | Strmac, Gordan (1499) | Lost 1-2 | -191508 |
| top | average opponent: 1530record: 4-5 | new rating: 1508 | ||
| Grand Prix Leipzig 2005 (BOK limited) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 115 | Vystejn, Jiri (1610) | Lost 1-2 | -161484 |
| 2sealed | 135 | Bergmann, Tim (1503) | Won 2-0 | +181502 |
| 3sealed | 134 | Ta, Luc (1682) | Lost 1-2 | -141488 |
| 4sealed | 181 | Pollack, Frank (1450) | Lost 1-2 | -191469 |
| 5sealed | 184 | Berkemeier, Christian (1463) | Won 2-0 | +181487 |
| 6sealed | 152 | Turpe, Benjamin (1454) | Won 2-0 | +171504 |
| 7sealed | 122 | Bosselmann, Tobias (1532) | Won 2-1 | +191523 |
| 8sealed | 87 | Klimes, Tomas (1783) | Won 2-1 | +221545 |
| 9sealed | 62 | Nielsen, Jan (1491) | Lost 1-2 | -191526 |
| top | average opponent: 1552record: 5-4 | new rating: 1526 | ||