Marczak, Marcin
Current rating: 1549
| Grand Prix Krakow 2019 (M20 limited) | starting rating: 1533 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 406 | Rygielski, Grzegorz (1500) | Lost 0-2 | -181515 |
| 2sealed | 535 | Palucki, Jerzy (1479) | Lost 1-2 | -191496 |
| 3sealed | 458 | Bartlome, Ronja (1462) | Won 2-1 | +171513 |
| 4sealed | 371 | Siniarski, Lukasz (1532) | Won 2-0 | +191532 |
| 5sealed | 244 | Paananen, Juha (1534) | Won 2-1 | +181550 |
| 6sealed | 273 | Zeggio, Riccardo (1586) | Won 2-0 | +181568 |
| 7sealed | 224 | Frnka, Roman (1490) | Lost 1-2 | -191549 |
| top | average opponent: 1512record: 4-3 | new rating: 1549 | ||
| Grand Prix Warsaw 2018 (GRN limited) | starting rating: 1501 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 445 | Rivoire, Jean-Luc (1699) | Lost 0-2 | -151486 |
| 2sealed | 425 | Correia, Roberto (1405) | Lost 0-2 | -191467 |
| 3sealed | 787 | Sandoghdar, Nima (1477) | Won 2-0 | +181485 |
| 4sealed | 783 | Gursinsky, Steffen (1761) | Won 2-0 | +231508 |
| 5sealed | 479 | Aarela, Tommi (1638) | Won 2-1 | +201528 |
| 6sealed | 419 | Leroy, Yannick (1755) | Won 2-0 | +231551 |
| 7sealed | 173 | Rossmark, Bart (1590) | Lost 0-2 | -181533 |
| top | average opponent: 1618record: 4-3 | new rating: 1533 | ||
| Grand Prix Prague 2001 (PLS limited) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 67 | Spacek, Pavel (1500) | Won 2-0 | +181518 |
| 2sealed | 139 | Klimes, Tomas (1518) | Lost 0-2 | -181500 |
| 3sealed | 146 | Stibinger, Ales (1551) | Lost 0-2 | -171483 |
| 4sealed | 234 | Hulle, Tomas (1482) | Won 2-1 | +181501 |
| top | average opponent: 1513record: 2-2 | new rating: 1501 | ||