Jefferson, Corey
Current rating: 1492
Record: 7-8
| Grand Prix Atlanta 2017 (XLN standard) | starting rating: 1448 | |||
| round | table | opponent (rating) | result | Δrating |
| 1standard | 145 | Wright, Timothy (1550) | Won 2-0 | +201468 |
| 2standard | 73 | Green, Richard (1571) | Won 2-0 | +201488 |
| 3standard | 192 | Mattie, David (1532) | Lost 1-2 | -171471 |
| 4standard | 408 | Drew, Council (1566) | Lost 1-2 | -171454 |
| 5standard | 331 | Simpson, Drew (1501) | Won 2-0 | +191473 |
| 6standard | 277 | Letourneau, Maria (1515) | Won 2-0 | +191492 |
| 7standard | 206 | Lettieri, Tony (1418) | Won 2-1 | +171509 |
| 8standard | 126 | Fonseca, Oscar (1556) | Won 2-0 | +191528 |
| 9standard | 77 | Willoughby, David (1580) | Lost 0-2 | -181510 |
| 10standard | 136 | Baker, Nicholas (1476) | Lost 0-2 | -181492 |
| average opponent: 1526record: 6-4 | new rating: 1492 | |||
| Grand Prix Charlotte 2016 (modern) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 3modern | 212 | Brait, Stephen (1536) | Lost 0-2 | -171483 |
| 4modern | 794 | Yannarella, David (1501) | Lost 0-2 | -181465 |
| 5modern | 684 | Wells, Stuart (1451) | Lost 0-2 | -181447 |
| 6modern | 550 | Krotter, Brennon (1543) | Won 2-0 | +191466 |
| 7modern | 513 | Novins, Michael (1445) | Lost 1-2 | -181448 |
| average opponent: 1495record: 1-4 | new rating: 1448 | |||