Jefferson, Brett
Current rating: 1431
Record: 4-8
| Grand Prix Melbourne 2016 (modern) | starting rating: 1446 | |||
| round | table | opponent (rating) | result | Δrating |
| 1modern | 260 | Anderson, Nathan P (1531) | Won 2-1 | +191465 |
| 2modern | 68 | McCormack, Eddie (1450) | Lost 0-2 | -181447 |
| 3modern | 232 | Szczecinski, Rowan (1500) | Won 2-1 | +191466 |
| 4modern | 127 | Avis, Benjamin (1481) | Lost 0-2 | -181448 |
| 5modern | 326 | Niekamp-Digney, William (1500) | Lost 0-2 | -171431 |
| 6modern | 431 | Kirby, Damien (1464) | Won 2-1 | +191450 |
| 7modern | 324 | Kobayashi, Souichi (1414) | Lost 0-2 | -191431 |
| average opponent: 1477record: 3-4 | new rating: 1431 | |||
| Grand Prix Melbourne 2009 (ZEN limited) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 32 | Bryx, Keren (1482) | Won 2-0 | +181518 |
| 2sealed | 6 | Weeks, Adan (1482) | Lost 0-2 | -191499 |
| 3sealed | 136 | Wong, Wai Bien (1534) | Lost 0-2 | -171482 |
| 4sealed | 141 | Cheong, Edmund (1482) | Lost 1-2 | -181464 |
| 5sealed | 168 | Shishkilov, Sergey (1463) | Lost 1-2 | -181446 |
| average opponent: 1489record: 1-4 | new rating: 1446 | |||