Marzka, Nathan
Current rating: 1506
| Grand Prix Columbus 2019 (modern) | starting rating: 1505 | |||
| round | table | opponent (rating) | result | Δrating |
| 1modern | 29 | Heintz, Ryan (1500) | Lost 1-2 | -181487 |
| 2modern | 248 | Fernandez, Christopher (1600) | Won 2-0 | +201507 |
| 3modern | 167 | Kowalski, Noah (1506) | Won 2-1 | +181525 |
| 4modern | 193 | Ebady, Amin (1480) | Lost 1-2 | -191506 |
| top | average opponent: 1521record: 2-2 | new rating: 1506 | ||
| Grand Prix Pittsburgh 2018 (DOM standard) | starting rating: 1499 | |||
| round | table | opponent (rating) | result | Δrating |
| 1standard | 153 | Hicks, Ryan (1461) | Won 2-1 | +171516 |
| 2standard | 26 | Davis, Andrew N. (1518) | Won 2-0 | +181534 |
| 3standard | 163 | Yang, Fanchen (1649) | Lost 1-2 | -161518 |
| 4standard | 222 | Izsak, Llanie (1787) | Lost 1-2 | -131505 |
| top | average opponent: 1604record: 2-2 | new rating: 1505 | ||
| Grand Prix Pittsburgh 2016 (SOI standard) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1standard | 101 | Black, Jacob (1425) | Won 2-0 | +171517 |
| 2standard | 185 | Cheatham, Adam (1518) | Lost 0-2 | -181499 |
| 3standard | 399 | Pack, Scott (1452) | Won 2-1 | +171516 |
| 4standard | 276 | Repta, Joel (1670) | Lost 1-2 | -151501 |
| 5standard | 391 | D'Ottavio, Joshua (1430) | Won 2-1 | +161517 |
| 6standard | 350 | Eichelberger, Gregory (1497) | Lost 0-2 | -181499 |
| top | average opponent: 1498record: 3-3 | new rating: 1499 | ||