Jones, David [CZE]
Current rating: 1392
Record: 14-22-1
| Grand Prix Prague 2019 (UMA limited) | starting rating: 1441 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 836 | Van Eijck, Paul (1525) | Won 2-0 | +201461 |
| 2sealed | 906 | Vainio, Aki (1348) | Lost 1-2 | -201441 |
| 3sealed | 594 | Philipp, Martin (1501) | Lost 1-2 | -171424 |
| 4sealed | 860 | Bohrkircher, Sascha (1546) | Lost 0-2 | -161408 |
| 5sealed | 968 | Lera Matellanes, Roberto (1505) | Lost 0-2 | -161392 |
| top | average opponent: 1485record: 1-4 | new rating: 1392 | ||
| Grand Prix Prague 2018 (modern) | starting rating: 1452 | |||
| round | table | opponent (rating) | result | Δrating |
| 1modern | 227 | Fischer, Hans Christian (1545) | Lost 1-2 | -161436 |
| 2modern | 613 | Vitari, Enrico (1482) | Lost 1-2 | -171419 |
| 3modern | 930 | Schulte, Timo (1463) | Won 2-0 | +191438 |
| 4modern | 667 | Hentschel, Rene (1414) | Won 2-0 | +171455 |
| 5modern | 599 | Havelka, Ondrej (1674) | Lost 0-2 | -141441 |
| top | average opponent: 1516record: 2-3 | new rating: 1441 | ||
| Grand Prix Prague 2017 (AER limited) | starting rating: 1399 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 296 | Kuril, Miroslav (1493) | Lost 1-2 | -161383 |
| 2sealed | 705 | Wenger, Marc (1439) | Won 2-0 | +191402 |
| 3sealed | 640 | Weiche, Benjamin (1545) | Draw 1-1 | +21404 |
| 4sealed | 660 | Reidinger, Fabian (1499) | Won 2-0 | +201424 |
| 5sealed | 455 | Trommer, Jens (1510) | Won 2-1 | +191443 |
| 6sealed | 284 | Varga, Martin (1543) | Won 2-1 | +201463 |
| 7sealed | 181 | Klumpp, Berthold (1677) | Lost 0-2 | -141449 |
| 8sealed | 313 | Schenka, Adolf (1624) | Won 2-1 | +211470 |
| 9sealed | 212 | Bohm, Philip (1473) | Lost 1-2 | -181452 |
| top | average opponent: 1533record: 5-3-1 | new rating: 1452 | ||
| Grand Prix Prague 2016 (legacy) | starting rating: 1445 | |||
| round | table | opponent (rating) | result | Δrating |
| 1legacy | 299 | Findejs, Jan (1529) | Lost 1-2 | -161429 |
| 2legacy | 482 | Himpe, Arno (1477) | Lost 0-2 | -171412 |
| 3legacy | 680 | Heerens, Daniel (1433) | Lost 1-2 | -181394 |
| 4legacy | 712 | Johnson, Matthew [ENG] (1496) | Won 2-1 | +201414 |
| 5legacy | 604 | Wrzecky, Jakub (1435) | Lost 1-2 | -181396 |
| 6legacy | 616 | Fahnrich, Dominik (1448) | Lost 0-2 | -171379 |
| 7legacy | 579 | Dresbach, Sascha (1426) | Won 2-0 | +191398 |
| 8legacy | 502 | Defant, Matteo (1447) | Lost 1-2 | -171381 |
| 9legacy | 465 | Michaelis, Mario (1372) | Won 2-0 | +181399 |
| top | average opponent: 1451record: 3-6 | new rating: 1399 | ||
| Grand Prix Bologna 2016 (modern) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1modern | 447 | Page, Craig (1445) | Lost 0-2 | -191481 |
| 2modern | 510 | Kernen, Marcel (1482) | Lost 0-2 | -181463 |
| 3modern | 968 | Jerome, Alec (1514) | Lost 1-2 | -171446 |
| 4modern | 1069 | Lave, Ole (1431) | Lost 1-2 | -181428 |
| 5modern | 1039 | Morpanini, Gianluca (1428) | Won 2-1 | +181446 |
| 6modern | 984 | Angelini, Roberto (1447) | Lost 1-2 | -181428 |
| 7modern | 921 | Tendl, Matthias (1427) | Won 2-0 | +181446 |
| 8modern | 797 | Swingler, Roland (1390) | Lost 0-2 | -191427 |
| 9modern | 721 | Ruzicka, Werner (1461) | Won 2-1 | +181445 |
| top | average opponent: 1447record: 3-6 | new rating: 1445 | ||