Marek, Jan
Current rating: 1547
Record: 37-39-2
| Grand Prix Utrecht 2019 (ELD limited) | starting rating: 1525 | |||
| round | table | opponent (rating) | result | Δrating |
| 3sealed | 237 | van Donselaar, Philip (1733) | Lost 0-2 | -151510 |
| 4sealed | 231 | Thiele, Daniel (1485) | Won 2-0 | +181528 |
| 5sealed | 218 | Singleton, Callum (1566) | Won 2-0 | +191547 |
| 6sealed | 133 | Hrycej, Martin (1942) | Lost 0-2 | -121535 |
| 7sealed | 235 | Nieke, Jonas (1928) | Lost 0-2 | -111524 |
| 8sealed | 270 | Wiktorzak, Piotr (1765) | Won 2-0 | +231547 |
| top | average opponent: 1736record: 3-3 | new rating: 1547 | ||
| Grand Prix Barcelona 2019 (modern) | starting rating: 1514 | |||
| round | table | opponent (rating) | result | Δrating |
| 3modern | 158 | Riphat, Aziz (1709) | Lost 0-2 | -141500 |
| 4modern | 414 | Kistler, Patrick (1649) | Lost 0-2 | -151485 |
| 5modern | 533 | Sanchez Uroz, Jose Miguel (1523) | Won 2-1 | +181503 |
| 6modern | 430 | Anwailer, Arkadiusz (1566) | Lost 1-2 | -171486 |
| 7modern | 406 | Richard, Jefferson (1588) | Won 2-1 | +201506 |
| 8modern | 292 | Arias, Marcel (1521) | Won 2-0 | +191525 |
| top | average opponent: 1593record: 3-3 | new rating: 1525 | ||
| Grand Prix Krakow 2019 (M20 limited) | starting rating: 1499 | |||
| round | table | opponent (rating) | result | Δrating |
| 3sealed | 247 | Schuer, Alan (1435) | Lost 0-2 | -191480 |
| 4sealed | 164 | Kusstatscher, Marco (1521) | Won 2-0 | +191499 |
| 5sealed | 157 | Spoerk, Markus (1854) | Lost 1-2 | -121487 |
| 6sealed | 191 | Szoke, Zoltan (1630) | Won 2-1 | +211508 |
| 7sealed | 330 | Majstrik, Jan (1580) | Lost 1-2 | -171491 |
| 8sealed | 363 | Vesaoja, Eero (1800) | Won 2-0 | +231514 |
| top | average opponent: 1637record: 3-3 | new rating: 1514 | ||
| Grand Prix London 2019 (WAR sealed) | starting rating: 1567 | |||
| round | table | opponent (rating) | result | Δrating |
| A1sealed | 263 | Karlsson, Mats (1742) | Lost 0-2 | -151552 |
| A2sealed | 331 | Tandy, Matthew (1495) | Won 2-0 | +171569 |
| A3sealed | 127 | Wilson, David [AUS] (1470) | Lost 0-2 | -191550 |
| A4sealed | 176 | Lambers, Florian (1368) | Lost 0-2 | -221528 |
| A5sealed | 168 | Maurri, Filippo (1862) | Won 2-1 | +241552 |
| A6sealed | 117 | Bukovskis, Vitalijs (1442) | Lost 0-2 | -201532 |
| A7sealed | 98 | Marill, Lou (1472) | Lost 0-2 | -191513 |
| D1sealed | 1199 | Pinkwart, Wiktor (1453) | Lost 1-2 | -191494 |
| D2sealed | 1240 | Malbrunot, Charlie (1508) | Won 2-1 | +181512 |
| D3sealed | 1194 | Lahr, Andrew (1500) | Won 2-1 | +181530 |
| D4sealed | 1156 | Bernat, Michael (2174) | Lost 0-2 | -81522 |
| D5sealed | 1127 | Vaver, Daniel (1507) | Lost 0-2 | -181504 |
| D6sealed | 1118 | Mohr, Lars (1470) | Lost 1-2 | -191485 |
| D7sealed | 1102 | Davis, Alan (1252) | Won 2-0 | +141499 |
| top | average opponent: 1551record: 5-9 | new rating: 1499 | ||
| Grand Prix Prague 2019 (UMA limited) | starting rating: 1617 | |||
| round | table | opponent (rating) | result | Δrating |
| 2sealed | 633 | Venancio, Ricardo (1508) | Lost 1-2 | -201597 |
| 3sealed | 996 | Laub, Brian (1467) | Lost 1-2 | -201577 |
| 4sealed | 1011 | Camobreco, Davide (1486) | Lost 1-2 | -201557 |
| 5sealed | 407 | Kuell, Dennis (1465) | Lost 0-2 | -191538 |
| 6sealed | 893 | Kollar, Melkior (1431) | Won 2-0 | +161554 |
| 7sealed | 709 | Novotny, Oliver (1426) | Draw 1-1 | -21552 |
| 8sealed | 591 | Prihoda, Jaromir (1429) | Won 2-0 | +151567 |
| top | average opponent: 1459record: 2-4-1 | new rating: 1567 | ||
| Grand Prix Lille 2018 (GRN standard) | starting rating: 1470 | |||
| round | table | opponent (rating) | result | Δrating |
| 1standard | 104 | Feret, Cedric (1526) | Lost 0-2 | -171453 |
| 2standard | 310 | Kalter, Phil (1638) | Won 2-1 | +211474 |
| 3standard | 428 | Dixmeras, Vincent (1380) | Won 2-1 | +161490 |
| 4standard | 389 | Gueho, Romain (1483) | Won 2-1 | +181508 |
| 5standard | 228 | Biernaux, Christophe (1452) | Won 2-1 | +171525 |
| 6standard | 67 | Hills, Nathan (1706) | Lost 0-2 | -151510 |
| 7standard | 164 | Girardot, John (1503) | Won 2-1 | +181528 |
| 8standard | 142 | Seoane, Sergio (1569) | Won 2-0 | +191547 |
| 9standard | 306 | Rosadini, Edoardo (1500) | Won 2-0 | +171564 |
| 10standard | 230 | Andrien, Arnaud (1737) | Lost 0-2 | -151549 |
| 11standard | 313 | Geide, Hannes (1525) | Won 2-0 | +181567 |
| 12standard | 247 | Budde, Christopher (1733) | Won 2-0 | +211588 |
| 13standard | 252 | Depraz, Jean-Emmanuel (1865) | Won 2-1 | +231611 |
| 14standard | 243 | Calf, David (1974) | Lost 1-2 | -121599 |
| 15standard | 263 | Renaudat, Guillaume (1623) | Won 2-0 | +181617 |
| top | average opponent: 1614record: 11-4 | new rating: 1617 | ||
| Grand Prix Prague 2018 (modern) | starting rating: 1416 | |||
| round | table | opponent (rating) | result | Δrating |
| 1modern | 607 | De Vincenzi, Alessio (1500) | Lost 0-2 | -161400 |
| 2modern | 623 | Halbich, Bernd (1483) | Won 2-0 | +191419 |
| 3modern | 634 | Wiktorzak, Piotr (1658) | Won 2-1 | +221441 |
| 4modern | 606 | Finogenow, Filip (1486) | Won 2-0 | +191460 |
| 5modern | 315 | Gunay, Ilker (1513) | Lost 1-2 | -171443 |
| 6modern | 517 | Hatto, Steve (1662) | Won 2-0 | +221465 |
| 7modern | 414 | Borcevsky, Pavel (1615) | Won 2-0 | +211486 |
| 8modern | 193 | Weiss, Julian (1579) | Lost 1-2 | -161470 |
| top | average opponent: 1562record: 5-3 | new rating: 1470 | ||
| Grand Prix Brussels 2018 (M19 standard) | starting rating: 1482 | |||
| round | table | opponent (rating) | result | Δrating |
| 1standard | 197 | Gil, Idris (1500) | Lost 0-2 | -181464 |
| 2standard | 300 | Erhart, Daniel (1615) | Lost 0-2 | -151449 |
| 3standard | 500 | Loriaux, Frederic (1463) | Won 2-0 | +181467 |
| 4standard | 460 | Gonzalez, David [ESP] (1613) | Lost 0-2 | -151452 |
| 5standard | 461 | Martorell, Alex (1416) | Lost 0-2 | -191433 |
| 6standard | 461 | Dal Pont, Thomas (1446) | Lost 0-1 | -171416 |
| 7standard | 435 | Bougues, Yorick (1428) | Won 2-0 | +181434 |
| 8standard | 384 | Bourmont, Matthieu (1445) | Lost 1-2 | -181416 |
| top | average opponent: 1491record: 2-6 | new rating: 1416 | ||
| Grand Prix Barcelona 2018 (modern) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1modern | 207 | Bouvet, Pierre-Louis (1409) | Won 2-1 | +161516 |
| 2modern | 133 | Casado Cabrera, Cristian (1518) | Lost 0-2 | -181498 |
| 3modern | 560 | Dohmen, David (1476) | Won 2-0 | +181516 |
| 4modern | 252 | Steyns, Nick (1822) | Lost 0-2 | -131503 |
| 5modern | 541 | Miath, Kenny (1437) | Draw 1-1 | -11502 |
| 6modern | 470 | Stabiner, Ben (1437) | Won 2-1 | +171519 |
| 7modern | 339 | Feuerstein, John (1614) | Lost 1-2 | -161503 |
| 8modern | 364 | Burge, David (1361) | Lost 1-2 | -211482 |
| top | average opponent: 1509record: 3-4-1 | new rating: 1482 | ||