Duda, Marcin
Current rating: 1441
Record: 6-11-1
| Grand Prix Toronto 2019 (modern) | starting rating: 1457 | |||
| round | table | opponent (rating) | result | Δrating |
| 3modern | 149 | Chang, Ryan (1505) | Won 2-1 | +191476 |
| 4modern | 29 | Kerr, Stephen (1576) | Draw 1-1 | +11477 |
| 5modern | 72 | Rupp, Ryan (1549) | Won 2-1 | +201497 |
| 6modern | 35 | Smith, Daniel (1572) | Won 2-1 | +191516 |
| 7modern | 18 | Brands, John (1555) | Won 2-0 | +191535 |
| 8modern | 9 | Jeffery, Russ (1564) | Lost 1-2 | -181517 |
| 9modern | 35 | Lu, Jiekun (1803) | Lost 0-2 | -131504 |
| 10modern | 414 | Harris, Trevor (1746) | Lost 1-2 | -131491 |
| 11modern | 431 | Huang, Ryan (1588) | Lost 1-2 | -171474 |
| 12modern | 437 | Schwartz, Sam (1558) | Lost 0-2 | -161458 |
| 13modern | 438 | Rubinoff, Jeremy (1523) | Lost 0-2 | -171441 |
| average opponent: 1594record: 4-6-1 | new rating: 1441 | |||
| Grand Prix Krakow 2015 (DTK standard) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1standard | 220 | Wagner, Christoph (1606) | Lost 1-2 | -161484 |
| 2standard | 305 | Rantila, Anton (1526) | Won 2-1 | +191503 |
| 3standard | 354 | Meier, Michael (1585) | Lost 0-2 | -171486 |
| 4standard | 451 | Jonsson, Andreas (1939) | Lost 1-2 | -101476 |
| 5standard | 518 | Barcaville, Gael (1449) | Lost 1-2 | -191457 |
| 6standard | 468 | Krawiecki, Dominik (1432) | Lost 0-2 | -181439 |
| 7standard | 411 | Zawadzki, Adam (1425) | Won 2-0 | +181457 |
| average opponent: 1566record: 2-5 | new rating: 1457 | |||