Marczewski, Grzegorz
Current rating: 1681
Record: 16-7-1
| Grand Prix Krakow 2019 (M20 limited) | starting rating: 1550 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 500 | Kiel Rosado, Mateo Antonio (1500) | Won 2-0 | +171567 |
| 2sealed | 381 | Riman, Vit (1530) | Won 2-0 | +171584 |
| 3sealed | 77 | Krynski, Tomasz (1573) | Won 2-1 | +181602 |
| 4sealed | 85 | Veneri, Dario (1772) | Draw 1-1 | +31605 |
| 5sealed | 61 | Stube, Martin (1559) | Won 2-0 | +171622 |
| 6sealed | 28 | Rodriguez, Lucas (1561) | Won 2-0 | +171639 |
| 7sealed | 150 | Ganz, Andreas (1807) | Won 2-0 | +211660 |
| 8sealed | 192 | Bonde, Michael (1883) | Won 2-1 | +221682 |
| 9sealed | 320 | Ward, Peter (2006) | Lost 1-2 | -121670 |
| 10draft | 400 | Pestov, Evgeny (1757) | Lost 1-2 | -171653 |
| 11draft | 400 | Veneri, Dario (1795) | Won 2-1 | +211674 |
| 12draft | 374 | Canonico, Davide (1943) | Lost 0-2 | -131661 |
| 13draft | 392 | Wlodarczyk, Lukasz (1608) | Won 2-1 | +171678 |
| 14draft | 345 | Lejeune, Olivier (1601) | Won 2-0 | +161694 |
| 15draft | 376 | Benages, Alfred (1928) | Lost 1-2 | -131681 |
| average opponent: 1721record: 10-4-1 | new rating: 1681 | |||
| Grand Prix Krakow 2015 (DTK standard) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1standard | 104 | Brzozowski, Tomasz (1500) | Won 2-0 | +181518 |
| 2standard | 32 | Sarkany, Norbert (1385) | Lost 0-2 | -201498 |
| 3standard | 380 | Zielinska, Anna (1500) | Won 2-0 | +181516 |
| 4standard | 352 | Styve, Nicolai (1550) | Lost 1-2 | -181498 |
| 5standard | 333 | Demmel, Christian (1374) | Won 2-1 | +161514 |
| 6standard | 322 | Gladysz, Adrian (1518) | Won 2-1 | +181532 |
| 7standard | 171 | Schafer, Benedikt (1490) | Won 2-1 | +171549 |
| 8standard | 108 | Wlodarczyk, Lukasz (1557) | Won 2-1 | +181567 |
| 9standard | 120 | Horka, Marek (1580) | Lost 1-2 | -171550 |
| average opponent: 1495record: 6-3 | new rating: 1550 | |||