Marhefke, Nathan
Current rating: 1489
Record: 5-6
| Grand Prix Minneapolis 2019 (modern) | starting rating: 1506 | |||
| round | table | opponent (rating) | result | Δrating |
| 1modern | 312 | Tinguely, Will (1426) | Won 2-0 | +171523 |
| 2modern | 49 | Straub, Joshua (1531) | Lost 0-2 | -181505 |
| 3modern | 376 | Russell, Devin (1570) | Won 2-0 | +191524 |
| 4modern | 199 | Preeshl, Tony (1570) | Lost 0-2 | -171507 |
| 5modern | 255 | Henriksen, Matthew (1508) | Lost 1-2 | -181489 |
| average opponent: 1521record: 2-3 | new rating: 1489 | |||
| Grand Prix Milwaukee 2018 (GRN standard) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1standard | 198 | Baker, John (1407) | Won 2-0 | +161516 |
| 2standard | 25 | Hamilton, Michael (1737) | Lost 1-2 | -141502 |
| 3standard | 299 | Brinkman, Jason (1608) | Won 2-0 | +201522 |
| 4standard | 183 | Eldred, Ron (1553) | Lost 0-2 | -171505 |
| 5standard | 359 | Boxleiter, Anthony (1451) | Won 2-0 | +171522 |
| 6standard | 264 | Bogdanov, Dennis (1667) | Lost 0-2 | -161506 |
| average opponent: 1571record: 3-3 | new rating: 1506 | |||