Williamson, Joshua
Current rating: 1382
| Grand Prix Los Angeles 2019 (modern) | starting rating: 1414 | |||
| round | table | opponent (rating) | result | Δrating |
| 1modern | 222 | Shepherd, Dustin (1455) | Won 2-1 | +191433 |
| 2modern | 227 | Ford, Nicholas (1419) | Lost 1-2 | -191414 |
| 3modern | 482 | Cruz, Francis (1540) | Lost 0-2 | -151399 |
| 4modern | 615 | Louie, Nelson (1482) | Lost 0-2 | -171382 |
| top | average opponent: 1474record: 1-3 | new rating: 1382 | ||
| Grand Prix Charlotte 2016 (modern) | starting rating: 1483 | |||
| round | table | opponent (rating) | result | Δrating |
| 1modern | 97 | Childress, Darrell (1530) | Lost 1-2 | -171466 |
| 2modern | 816 | O'brien, Conner (1448) | Won 2-1 | +181484 |
| 3modern | 712 | Tharrington, Taylor (1501) | Lost 1-2 | -181466 |
| 4modern | 1009 | Pulling, Brock (1484) | Lost 1-2 | -181448 |
| 5modern | 811 | Shaw, Joel (1463) | Lost 1-2 | -171431 |
| 6modern | 693 | Stafford, Cam (1502) | Lost 0-2 | -171414 |
| top | average opponent: 1488record: 1-5 | new rating: 1414 | ||
| Grand Prix Atlanta 2008 (ALA limited) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 191 | Vicini, Patrick (1500) | Won 2-1 | +181518 |
| 2sealed | 17 | Watkins, Vincent Y (1518) | Lost 0-2 | -181500 |
| 3sealed | 120 | Kincaid, Tim (1519) | Lost 0-2 | -181482 |
| 4sealed | 242 | Nikoula, Mark (1528) | Won 2-1 | +191501 |
| 5sealed | 212 | Kilgore, Jesse (1502) | Lost 1-2 | -181483 |
| top | average opponent: 1513record: 2-3 | new rating: 1483 | ||