de Beer, Theun
Current rating: 1620
Record: 46-42-6
| Grand Prix Prague 2018 (modern) | starting rating: 1579 | |||
| round | table | opponent (rating) | result | Δrating |
| 1modern | 152 | Derpmann, Werner (1350) | Won 2-1 | +141593 |
| 2modern | 84 | Cal, Bugra Alp (1513) | Won 2-1 | +171610 |
| 3modern | 357 | Andrzejewski, Jakub (1514) | Draw 1-1 | -21608 |
| 4modern | 234 | Krieger, Philipp (1821) | Won 2-1 | +221630 |
| 5modern | 113 | Theurel, Sebastien (1700) | Lost 0-2 | -171613 |
| 6modern | 275 | de Jong, Bob (1443) | Won 2-1 | +151628 |
| 7modern | 162 | Casamenti, Andrea (1354) | Won 2-0 | +131641 |
| 8modern | 99 | Poroszkai, Laszlo (1751) | Won 1-0 | +201661 |
| 9modern | 59 | Klimke, Chris (1695) | Draw 1-1 | +11662 |
| 10modern | 118 | Christensen, Oscar (2034) | Lost 0-2 | -121650 |
| 11modern | 151 | Bogensperger, Phillip (1577) | Won 2-0 | +171667 |
| 12modern | 112 | Salvatto, Luis (1999) | Lost 0-2 | -121655 |
| 13modern | 137 | Catton, Rob (1871) | Lost 1-2 | -141641 |
| 14modern | 146 | Barbero, Ignacio (1485) | Lost 0-2 | -211620 |
| top | average opponent: 1650record: 7-5-2 | new rating: 1620 | ||
| Grand Prix Lille 2015 (legacy) | starting rating: 1601 | |||
| round | table | opponent (rating) | result | Δrating |
| 1legacy | 160 | Carmichael, Simon (1596) | Draw 1-1 | 01601 |
| 2legacy | 361 | Laine, Fabien (1686) | Draw 1-1 | +21603 |
| 3legacy | 621 | Vidal, Andreu (1316) | Lost 0-2 | -241579 |
| top | average opponent: 1533record: 0-1-2 | new rating: 1579 | ||
| Grand Prix Krakow 2015 (DTK standard) | starting rating: 1609 | |||
| round | table | opponent (rating) | result | Δrating |
| 2standard | 219 | Ladachowski, Kamil (1374) | Won 2-1 | +141623 |
| 3standard | 281 | Cammilluzzi, Marco (2012) | Lost 1-2 | -111612 |
| 4standard | 256 | Altobelli, Simone Dani (1447) | Lost 0-2 | -211591 |
| 5standard | 338 | Stappers, Filip (1499) | Won 2-1 | +161607 |
| 6standard | 303 | Pisula, Marcin (1459) | Won 2-1 | +151622 |
| 7standard | 224 | Brankaert, Rens (1587) | Lost 1-2 | -181604 |
| 8standard | 61 | Cwiklinski, Piotr (1522) | Lost 0-2 | -201584 |
| 9standard | 242 | Bedkowska, Kaja (1520) | Won 2-1 | +171601 |
| top | average opponent: 1552record: 4-4 | new rating: 1601 | ||
| Grand Prix Utrecht 2014 (M15 standard) | starting rating: 1627 | |||
| round | table | opponent (rating) | result | Δrating |
| 1standard | 276 | Horacek, Jiri (1500) | Won 2-1 | +161643 |
| 2standard | 302 | Papes, Anthony (1518) | Won 2-1 | +161659 |
| 3standard | 166 | Ahkaloo, Jhayshan (1647) | Lost 1-2 | -181641 |
| 4standard | 299 | Langner, Matthias (1792) | Lost 0-2 | -161625 |
| 5standard | 419 | Smet, Roald (1722) | Lost 0-2 | -161609 |
| top | average opponent: 1636record: 2-3 | new rating: 1609 | ||
| Grand Prix Paris 2014 (legacy) | starting rating: 1549 | |||
| round | table | opponent (rating) | result | Δrating |
| 2legacy | 28 | Pispa, Lauri (1518) | Won 2-1 | +181567 |
| 3legacy | 467 | Schulhof, Anthony (1560) | Won 2-0 | +171584 |
| 4legacy | 89 | Desruelle, Jean-Marie (1531) | Won 2-1 | +181602 |
| 5legacy | 59 | Leonov, Roman (1604) | Draw 1-1 | 01602 |
| 6legacy | 47 | Yanguas, Fernando (1633) | Won 2-1 | +181620 |
| 7legacy | 24 | Berteaux, Julien (1800) | Won 2-0 | +211641 |
| 8legacy | 11 | van der End, Martijn (1635) | Lost 0-2 | -181623 |
| 9legacy | 48 | Lorenz, Maximilian (1653) | Won 2-0 | +191642 |
| 10legacy | 28 | Germain, Cedric (1607) | Draw 1-1 | -11641 |
| 11legacy | 58 | Song, Huachao (1777) | Lost 0-2 | -151626 |
| 12legacy | 75 | Czolk, Stefan (1739) | Lost 0-0 | -161610 |
| 13legacy | 83 | De Castro Sanchez, Ivan (1597) | Won 2-1 | +171627 |
| 14legacy | 69 | Simmonds, Alex (1590) | Lost 0-2 | -181609 |
| 15legacy | 76 | Vardaramatos, Spyros (1647) | Won 2-0 | +181627 |
| top | average opponent: 1635record: 8-4-2 | new rating: 1627 | ||
| Grand Prix Antwerp 2013 (modern) | starting rating: 1509 | |||
| round | table | opponent (rating) | result | Δrating |
| 2modern | 30 | Van Casteren, Wouter (1521) | Lost 0-2 | -181491 |
| 3modern | 478 | Giampaolo, Francesco (1379) | Won 2-1 | +161507 |
| 4modern | 297 | Breheret, Kevin (1552) | Lost 1-2 | -171490 |
| 5modern | 424 | Van Uffelen, Bart (1450) | Won 2-0 | +171507 |
| 6modern | 380 | Venancio, Ricardo (1558) | Won 2-0 | +191526 |
| 7modern | 253 | Beauvais, Vivien (1536) | Won 2-0 | +181544 |
| 8modern | 156 | van Rijn, FW (1528) | Won 2-0 | +181562 |
| 9modern | 59 | Sutor, Emanuel (1842) | Lost 0-2 | -131549 |
| top | average opponent: 1546record: 5-3 | new rating: 1549 | ||
| Grand Prix Strasbourg 2013 (legacy) | starting rating: 1517 | |||
| round | table | opponent (rating) | result | Δrating |
| 4legacy | 127 | Bendix Nielsen, Andreas (1497) | Lost 0-2 | -181499 |
| 5legacy | 166 | Bailly-Maitre, Gael (1782) | Lost 0-2 | -131486 |
| 6legacy | 258 | Pichon, Elie (1860) | Won 2-0 | +241510 |
| 7legacy | 279 | Hosejka, Vadim (1461) | Won 2-0 | +171527 |
| 8legacy | 122 | Bartl, Sebastian (1515) | Lost 0-2 | -181509 |
| top | average opponent: 1623record: 2-3 | new rating: 1509 | ||
| Grand Prix Bochum 2012 (RTR standard) | starting rating: 1546 | |||
| round | table | opponent (rating) | result | Δrating |
| 3standard | 596 | Rosada, Adrian (1720) | Lost 0-2 | -151531 |
| 4standard | 626 | Riffert, Till (1817) | Won 2-1 | +231554 |
| 5standard | 568 | Schallenberg, Florian (1537) | Lost 0-2 | -181536 |
| 6standard | 690 | Morre Pedersen, Morten (1482) | Lost 1-2 | -191517 |
| top | average opponent: 1639record: 1-3 | new rating: 1517 | ||
| Grand Prix Ghent 2012 (legacy) | starting rating: 1542 | |||
| round | table | opponent (rating) | result | Δrating |
| 4legacy | 606 | Jurmann, Aadi (1500) | Won 2-0 | +181560 |
| 5legacy | 647 | Euser, Maarten (1569) | Lost 0-2 | -181542 |
| 6legacy | 657 | Miracca, Alessandro (1533) | Won 2-0 | +181560 |
| 7legacy | 626 | Lesaege, Clement (1823) | Won 2-1 | +221582 |
| 8legacy | 622 | Crepelle, Nicolas (1637) | Lost 0-2 | -171565 |
| 9legacy | 664 | Lindeman, Lennart (1532) | Won 2-1 | +181583 |
| 10legacy | 673 | Carette, Remi (1637) | Lost 0-2 | -171566 |
| 11legacy | 69 | Geeraerts, Jo (1671) | Lost 1-2 | -161550 |
| 12legacy | 81 | Chiche, Kevin (1683) | Won 2-1 | +201570 |
| 13legacy | 65 | Floch, Ivan (1907) | Lost 0-2 | -121558 |
| 14legacy | 74 | Kesseler, Marco (1654) | Won 2-0 | +201578 |
| 15legacy | 64 | Valkeneers, Tom (1748) | Lost 0-2 | -151563 |
| 16legacy | 63 | Kaukoranta, Ville (1638) | Lost 1-2 | -171546 |
| top | average opponent: 1656record: 6-7 | new rating: 1546 | ||
| Grand Prix Lille 2012 (DKA standard) | starting rating: 1504 | |||
| round | table | opponent (rating) | result | Δrating |
| 2standard | 588 | Gruia, David (1518) | Lost 1-2 | -181486 |
| 3standard | 709 | Beuscart, Jean Marie (1437) | Won 2-1 | +171503 |
| 4standard | 635 | Castillan, Julien (1517) | Won 2-0 | +191522 |
| 5standard | 602 | Franek, Guillaume (1525) | Lost 1-2 | -181504 |
| 6standard | 642 | Galindo, Richard (1485) | Lost 0-2 | -191485 |
| 7standard | 728 | Petit, Arnaud (1452) | Won 2-0 | +181503 |
| 8standard | 648 | Cichecki, Lukasz (1660) | Won 2-1 | +211524 |
| 9standard | 640 | Biltcliffe, Adam (1564) | Won 2-0 | +181542 |
| top | average opponent: 1520record: 5-3 | new rating: 1542 | ||
| Grand Prix Amsterdam 2011 (legacy) | starting rating: 1501 | |||
| round | table | opponent (rating) | result | Δrating |
| 1legacy | 122 | Korf, Stefan (1500) | Won 2-1 | +181519 |
| 2legacy | 80 | Torronen, Tapio (1518) | Lost 1-2 | -181501 |
| 3legacy | 171 | Moenkemoeller, Marc (1502) | Won 2-0 | +181519 |
| 4legacy | 217 | McHugh, Evan (1510) | Lost 1-2 | -181501 |
| 5legacy | 259 | Soriente, Gregorio (1544) | Won 2-0 | +191520 |
| 6legacy | 150 | Lebrun, Nicolas (1650) | Lost 0-2 | -161504 |
| top | average opponent: 1537record: 3-3 | new rating: 1504 | ||
| Grand Prix Brussels 2010 (WWK standard) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1standard | 198 | Callens, Jeroen (1524) | Won 2-1 | +181518 |
| 2standard | 12 | Mees, Christophe (1518) | Won 2-1 | +181536 |
| 3standard | 95 | Goovaerts, Raf (1629) | Lost 1-2 | -161520 |
| 4standard | 174 | Pluijmen, Mark (1562) | Lost 1-2 | -171503 |
| 5standard | 290 | Ang, Arjan (1499) | Lost 0-2 | -181485 |
| 6standard | 287 | Akulsin, Martin (1396) | Won 2-1 | +161501 |
| top | average opponent: 1521record: 3-3 | new rating: 1501 | ||