Westberg, Jon [SWE]
Current rating: 1817 (#1800)
Record: 65-35
| Grand Prix Birmingham 2017 (modern) | starting rating: 1843 | |||
| round | table | opponent (rating) | result | Δrating |
| 1modern | 15 | Nacsa, Zsofia (1530) | Won 2-1 | +131856 |
| 2modern | 216 | Theobalds, Graham (1454) | Won 0-0 | +111867 |
| 3modern | 93 | Wachholz, Joel (1425) | Won 2-1 | +101877 |
| 4modern | 188 | Nielsen, Simon (1995) | Lost 0-2 | -161861 |
| 5modern | 223 | Abelita, Andre (1518) | Won 2-0 | +121873 |
| 6modern | 76 | Hansen, Rasmus [EST] (1605) | Lost 0-2 | -221851 |
| 7modern | 217 | Watkins, Alex (1532) | Lost 0-2 | -241827 |
| 8modern | 360 | Kirchbacher, Florian (1729) | Won 2-1 | +161843 |
| 9modern | 358 | Rasmussen, Martin (1384) | Lost 1-2 | -261817 |
| top | average opponent: 1575record: 5-4 | new rating: 1817 | ||
| Grand Prix Warsaw 2016 (KLD standard) | starting rating: 1820 | |||
| round | table | opponent (rating) | result | Δrating |
| 1standard | 152 | Pelzl, Michael (1495) | Won 2-0 | +121832 |
| 2standard | 156 | Terziyski, Nikolay (1505) | Won 2-1 | +121844 |
| 3standard | 244 | Magni, Luca (1850) | Lost 1-2 | -181826 |
| 4standard | 185 | Kaitila, Aleksi (1470) | Won 2-0 | +121838 |
| 5standard | 179 | Popielski, Michal (1458) | Lost 0-2 | -251813 |
| 6standard | 318 | Eloranta, Joonas (1459) | Lost 1-2 | -241789 |
| 7standard | 370 | Schmatz, Toni (1504) | Won 2-0 | +131802 |
| 8standard | 302 | Tartarini, Lorenzo (1473) | Won 2-1 | +121814 |
| 9standard | 175 | Loufek, Vaclav (1644) | Won 2-0 | +151829 |
| 10standard | 145 | Devizyte, Egle (1621) | Lost 0-2 | -221807 |
| 11standard | 140 | Kalamarz, Lukasz (1470) | Won 2-1 | +131820 |
| 12standard | 103 | Manchado, Alberto (1666) | Lost 1-2 | -211799 |
| 13standard | 134 | Blesa Moreno, Jorge (1449) | Won 2-1 | +121811 |
| 14standard | 98 | Rask, Love (1759) | Won 2-0 | +171828 |
| 15standard | 103 | Liwerski, Rafal (1701) | Won 2-0 | +151843 |
| top | average opponent: 1568record: 10-5 | new rating: 1843 | ||
| Grand Prix Stockholm 2014 (KTK standard) | starting rating: 1829 | |||
| round | table | opponent (rating) | result | Δrating |
| 3standard | 436 | Lindberg, Jens (1546) | Lost 0-2 | -231806 |
| 4standard | 245 | Wrana, Rasmus (1519) | Won 2-1 | +131819 |
| 5standard | 136 | Lodder, Robert (1494) | Won 2-0 | +131832 |
| 6standard | 257 | Mellberg, Eric (1659) | Won 2-1 | +141846 |
| 7standard | 312 | Jurmann, Aadi (1631) | Won 2-1 | +151861 |
| 8standard | 10 | Rodrigues, Thiago (1677) | Lost 0-2 | -221839 |
| 9standard | 42 | Schwarz, Sascha (1744) | Lost 1-2 | -191820 |
| top | average opponent: 1610record: 4-3 | new rating: 1820 | ||
| Grand Prix Warsaw 2013 (M14 standard) | starting rating: 1772 | |||
| round | table | opponent (rating) | result | Δrating |
| 3standard | 200 | Borcevsky, Pavel (1660) | Lost 1-2 | -201752 |
| 4standard | 227 | Pieszko, Tommy D (1518) | Won 2-0 | +141766 |
| 5standard | 232 | Steinke, Michael (1458) | Won 2-1 | +131779 |
| 6standard | 115 | Rigby, Neil (1724) | Won 2-1 | +171796 |
| 7standard | 29 | Vantyghem, Xavier (1547) | Won 2-1 | +131809 |
| 8standard | 49 | Ferry, Sergio (1545) | Won 2-1 | +141823 |
| 9standard | 23 | Bonde, Michael (1891) | Lost 1-2 | -171806 |
| 10standard | 27 | Portaro, Alessandro (1795) | Lost 0-2 | -181788 |
| 11standard | 56 | Zaporski, Grzegorz (1558) | Won 2-0 | +131801 |
| 12standard | 37 | Dziedziel, Szymon (1567) | Won 2-1 | +141815 |
| 13standard | 77 | Rizzi, Mattia (1809) | Won 2-1 | +181833 |
| 14standard | 12 | Salmi, Matti (1649) | Lost 0-2 | -211812 |
| 15standard | 40 | Ganz, Andreas (1789) | Won 2-1 | +171829 |
| top | average opponent: 1655record: 9-4 | new rating: 1829 | ||
| Grand Prix Rimini 2013 (M14 limited) | starting rating: 1815 | |||
| round | table | opponent (rating) | result | Δrating |
| 3sealed | 191 | Scheinin, Martin (2026) | Lost 1-2 | -141801 |
| 4sealed | 272 | Fiori, Stefano (1627) | Won 2-0 | +151816 |
| 5sealed | 200 | Regis, Giulio (1459) | Won 2-0 | +121828 |
| 6sealed | 58 | Danieli, Niv (1520) | Lost 0-2 | -241804 |
| 7sealed | 222 | Moretti, Lorenzo (1543) | Lost 1-2 | -231781 |
| 8sealed | 209 | Mariotti, Fabio (1536) | Won 2-0 | +141795 |
| 9sealed | 183 | Idelfonso, Diony (1532) | Lost 1-2 | -231772 |
| top | average opponent: 1606record: 3-4 | new rating: 1772 | ||
| Grand Prix Gothenburg 2013 (DGM limited) | starting rating: 1736 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 204 | Kallman, Peter (1500) | Won 2-0 | +141750 |
| 2sealed | 189 | Modin, Jim (1484) | Won 2-0 | +131763 |
| 3sealed | 95 | Holm, Jacob (1488) | Won 2-0 | +141777 |
| 4sealed | 106 | Fourreau, Sebastien (1466) | Won 2-0 | +121789 |
| 5sealed | 1 | Estratti, Samuele (1910) | Won 2-1 | +201809 |
| 6sealed | 9 | Dippon, Andreas (1591) | Won 2-0 | +141823 |
| 7sealed | 12 | Persson, Fredrik 5557 (1608) | Lost 0-2 | -211802 |
| 8sealed | 40 | Disenborg, Johan (1645) | Won 2-0 | +151817 |
| 9sealed | 15 | Mortensen, Pal Berg (1752) | Lost 1-2 | -201797 |
| 10draft | 50 | Vindoy, Audun (1557) | Lost 0-2 | -221775 |
| 11draft | 47 | Davidsson, Simon (1587) | Lost 0-2 | -211754 |
| 12draft | 8 | Haugum, Andreas (1531) | Won 2-1 | +141768 |
| 13draft | 52 | Driessen, Thomas (1704) | Won 2-0 | +171785 |
| 14draft | 41 | Tomici, Sergio (1589) | Won 2-0 | +141799 |
| 15draft | 23 | Telarov, Aleksa (1691) | Won 2-0 | +161815 |
| top | average opponent: 1607record: 11-4 | new rating: 1815 | ||
| Grand Prix Bilbao 2013 (modern) | starting rating: 1709 | |||
| round | table | opponent (rating) | result | Δrating |
| 1modern | 109 | Gomez Salgado, Iago I (1485) | Lost 1-2 | -221687 |
| 2modern | 320 | Cornejo, Pablo Victor (1482) | Lost 0-2 | -221665 |
| 3modern | 353 | Vallejo Pascual, Inigo (1488) | Won 2-1 | +151680 |
| 4modern | 340 | Virtmax, Johanss (1484) | Won 2-1 | +141694 |
| 5modern | 343 | Bogeat, David (1547) | Won 2-0 | +151709 |
| 6modern | 210 | Marcillac, Anthony (1506) | Won 2-1 | +151724 |
| 7modern | 213 | Vigne, Bertrand (1608) | Lost 0-2 | -201704 |
| 8modern | 215 | Dupuy de Lome, Alejandro (1718) | Won 2-1 | +181722 |
| 9modern | 149 | Economides, Ioannis (1526) | Won 2-0 | +141736 |
| top | average opponent: 1538record: 6-3 | new rating: 1736 | ||
| Grand Prix Malmo 2012 (AVR limited) | starting rating: 1550 | |||
| round | table | opponent (rating) | result | Δrating |
| 4sealed | 20 | Damo da Rosa, Paulo Vitor (2139) | Won 2-1 | +271577 |
| 5sealed | 21 | Pedrakowski, Tomasz (1940) | Lost 1-2 | -111566 |
| 6sealed | 40 | Telarov, Aleksa (1700) | Lost 1-2 | -161550 |
| 7sealed | 60 | Bakkehaug, Christian (1721) | Won 2-1 | +211571 |
| 8sealed | 55 | Kondrk, Marcel (1605) | Won 2-1 | +191590 |
| 9sealed | 24 | Kristensen, Kasper (1582) | Won 2-1 | +171607 |
| 10draft | 54 | Bergstrom, Jonathan (1756) | Won 2-1 | +211628 |
| 11draft | 48 | Rodrigues, Ricardo (1660) | Won 2-0 | +191647 |
| 12draft | 54 | Zeil, Jean-Julien (1725) | Won 2-0 | +191666 |
| 13draft | 39 | Lund, Kim Robin (1821) | Won 2-1 | +211687 |
| 14draft | 3 | Thor, Patrik (1871) | Won 2-1 | +211708 |
| 15draft | 20 | Abou Omar, Ashraf (1786) | Won 2-0 | +201728 |
| Qdraft | Almgren, Oscar (1664) | Lost 0-2 | -191709 | |
| top | average opponent: 1767record: 10-3 | new rating: 1709 | ||
| Grand Prix Amsterdam 2011 (legacy) | starting rating: 1575 | |||
| round | table | opponent (rating) | result | Δrating |
| 1legacy | 106 | Breves, Gerrit (1500) | Won 2-0 | +161591 |
| 2legacy | 42 | Pischinger, Felix (1509) | Lost 0-2 | -191572 |
| 3legacy | 214 | Derpmann, Werner (1445) | Won 2-1 | +161588 |
| 4legacy | 154 | Baauw, Dennis (1656) | Lost 1-2 | -171571 |
| 5legacy | 338 | Kelterbaum, Richard (1386) | Lost 1-2 | -211550 |
| top | average opponent: 1499record: 2-3 | new rating: 1550 | ||
| Grand Prix Gothenburg 2010 (M11 limited) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 4sealed | 515 | Thor, Patrik (1601) | Lost 0-2 | -161484 |
| 5sealed | 590 | Kettil, Mattias (1925) | Won 2-1 | +251509 |
| 6sealed | 520 | Belova, Zoya (1506) | Won 2-1 | +181527 |
| 7sealed | 528 | Hellgren, Robert (1652) | Won 2-0 | +211548 |
| 8sealed | 513 | Schulmerich, Felix (1752) | Won 2-0 | +211569 |
| 9sealed | 513 | Geist, Jonathan (1593) | Won 2-0 | +191588 |
| 10draft | 55 | Gregoir, Christophe (1875) | Lost 0-2 | -131575 |
| top | average opponent: 1701record: 5-2 | new rating: 1575 | ||