Derr, Joseph
Current rating: 1413
Record: 2-7
| Grand Prix Charlotte 2015 (modern) | starting rating: 1445 | |||
| round | table | opponent (rating) | result | Δrating |
| 1modern | 264 | Corbin, Julia (1370) | Won 2-1 | +171462 |
| 2modern | 356 | Schlichting, Bill (1516) | Lost 0-2 | -171445 |
| 3modern | 556 | White, Jon (1610) | Lost 0-2 | -151430 |
| 4modern | 509 | Smith, Markus (1499) | Lost 0-2 | -171413 |
| average opponent: 1499record: 1-3 | new rating: 1413 | |||
| Grand Prix Atlanta 2014 (JOU limited) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 339 | Kispert, Cameron (1500) | Won 2-1 | +181518 |
| 2sealed | 376 | Huckaby, Kyle (1529) | Lost 1-2 | -181500 |
| 3sealed | 666 | Viera, John (1502) | Lost 0-2 | -181482 |
| 4sealed | 740 | Wolfe, Jeremy (1432) | Lost 0-2 | -191463 |
| 5sealed | 721 | Webb, Kevin (1463) | Lost 0-2 | -181445 |
| average opponent: 1485record: 1-4 | new rating: 1445 | |||