Jefferson, Jay C
Current rating: 1415
Record: 5-10
| Grand Prix Brisbane 2013 (modern) | starting rating: 1463 | |||
| round | table | opponent (rating) | result | Δrating |
| 2modern | 18 | Fowler, Shane (1493) | Lost 1-2 | -181445 |
| 3modern | 100 | Meric, Kayra (1463) | Lost 1-2 | -171428 |
| 4modern | 198 | Darcey, Simon (1537) | Lost 0-2 | -161412 |
| 5modern | 178 | Johnston, William [AUS] (1465) | Won 2-0 | +191431 |
| 6modern | 151 | Woelfler, Walter (1471) | Lost 1-2 | -181413 |
| 7modern | 141 | Armstrong, Kimberley (1450) | Lost 0-2 | -171396 |
| 8modern | 124 | Chalmers-Borello, Matthew (1443) | Won 2-1 | +191415 |
| average opponent: 1474record: 2-5 | new rating: 1415 | |||
| Grand Prix Brisbane 2011 (ISD standard) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1standard | 97 | Dore, Andrew (1500) | Won 2-0 | +181518 |
| 2standard | 69 | Stoddart, Thomas (1531) | Lost 1-2 | -181500 |
| 3standard | 124 | Van Der Heiden, Jacob (1482) | Lost 0-2 | -181482 |
| 4standard | 126 | DAmour, Kira (1483) | Won 0-0 | +181500 |
| 5standard | 111 | Norton, Mark (1474) | Lost 0-2 | -191481 |
| 6standard | 131 | Solomon, Luke (1449) | Lost 0-2 | -181463 |
| 7standard | 128 | Wilks, James (1465) | Lost 0-2 | -181445 |
| 8standard | 115 | Weeks, Adan (1446) | Won 2-1 | +181463 |
| average opponent: 1479record: 3-5 | new rating: 1463 | |||