Koziel, Mariusz
Current rating: 1634
| Grand Prix Krakow 2019 (M20 limited) | starting rating: 1571 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 496 | Wywiol, Rafal (1519) | Won 2-0 | +171588 |
| 2sealed | 477 | Zuger, Christoph (1497) | Won 2-0 | +171605 |
| 3sealed | 234 | Marek, Krzysztof (1877) | Won 2-0 | +221627 |
| 4sealed | 47 | Tuduri, Ricard (1901) | Lost 0-2 | -131614 |
| 5sealed | 78 | Wiseman, Robert (1422) | Draw 1-1 | -31611 |
| 6sealed | 135 | Andersson, Thomas (1543) | Lost 0-2 | -191592 |
| 7sealed | 342 | Hrycej, Martin (1968) | Won 2-0 | +241616 |
| 8sealed | 326 | Lemke, Gero (1598) | Won 2-0 | +181634 |
| top | average opponent: 1666record: 5-2-1 | new rating: 1634 | ||
| Grand Prix Prague 2019 (UMA limited) | starting rating: 1571 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 855 | Sponick, Soren (1500) | Won 2-0 | +161587 |
| 2sealed | 720 | Schlegel, Michael (1621) | Draw 1-1 | +11588 |
| 3sealed | 545 | Frenster, Jochen (1701) | Won 2-1 | +201608 |
| 4sealed | 269 | De Place, Lauge (1926) | Lost 0-2 | -121596 |
| 5sealed | 542 | Cherfan, Raphael (1519) | Lost 0-2 | -201576 |
| 6sealed | 711 | Gandelman, Elvira (1502) | Draw 1-1 | -11575 |
| 7sealed | 670 | Czapla, Tadeusz (1485) | Won 2-0 | +161591 |
| 8sealed | 503 | Pinkwart, Wiktor (1469) | Lost 0-2 | -201571 |
| top | average opponent: 1590record: 3-3-2 | new rating: 1571 | ||
| Grand Prix Warsaw 2018 (GRN limited) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 50 | Marti, Jordi (1707) | Won 2-0 | +221522 |
| 2sealed | 5 | Hacker, Christoph (1755) | Won 2-0 | +221544 |
| 3sealed | 218 | Anderson, Graham (1498) | Won 2-1 | +171561 |
| 4sealed | 43 | Grafensteiner, Daniel (1986) | Lost 0-2 | -111550 |
| 5sealed | 132 | Kosierkiewicz, Ernest (1447) | Draw 1-1 | -21548 |
| 6sealed | 274 | Joachim, David (1815) | Lost 0-2 | -131535 |
| 7sealed | 416 | Courtiat, Robin (1528) | Won 2-0 | +181553 |
| 8sealed | 287 | Zehetmayer, Simon (1534) | Won 2-1 | +181571 |
| top | average opponent: 1659record: 5-2-1 | new rating: 1571 | ||