Williamson, Justin
Current rating: 1451
Record: 2-5
| Grand Prix Detroit 2019 (M20 limited) | starting rating: 1481 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 204 | Knowles, Kegan (1532) | Lost 0-2 | -171464 |
| 2sealed | 194 | Ziegler, Ryan (1741) | Lost 0-2 | -131451 |
| average opponent: 1637record: 0-2 | new rating: 1451 | |||
| Grand Prix Chicago 2014 (JOU standard) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1standard | 221 | Kinnear, Kyle (1500) | Lost 0-2 | -181482 |
| 2standard | 369 | Colon, George (1482) | Won 2-1 | +181500 |
| 3standard | 320 | Martin, Joshua (1466) | Lost 0-2 | -191481 |
| 4standard | 354 | Cruz, Jeffrey (1465) | Won 2-0 | +181499 |
| 5standard | 342 | Gerleman, Alex (1483) | Lost 0-0 | -181481 |
| average opponent: 1479record: 2-3 | new rating: 1481 | |||