Williamson, Charles E
Current rating: 1503
Record: 6-6
| Grand Prix Philadelphia 2012 (RTR limited) | starting rating: 1517 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 55 | Mattis, Ryan (1519) | Won 2-0 | +181535 |
| 2sealed | 188 | Buscaino, Anthony (1870) | Lost 0-2 | -121523 |
| 3sealed | 314 | Bryant, Steven (1486) | Lost 0-2 | -191504 |
| 4sealed | 346 | Hudson, Kyle (1463) | Won 2-0 | +171521 |
| 5sealed | 267 | Hattwick, Nicholas (1514) | Lost 0-2 | -181503 |
| average opponent: 1571record: 2-3 | new rating: 1503 | |||
| Grand Prix Baltimore 2012 (DKA standard) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1standard | 356 | Bowers, Adam (1500) | Lost 1-2 | -181482 |
| 2standard | 85 | Sweeney, Michael s (1482) | Won 2-0 | +181500 |
| 3standard | 590 | Rone, William S (1500) | Won 2-1 | +181518 |
| 4standard | 369 | Schultheis, Megan (1439) | Lost 0-2 | -191499 |
| 5standard | 438 | Dull, Justin (1474) | Won 2-1 | +171516 |
| 6standard | 324 | Byrne, Tyler (1500) | Lost 1-2 | -181498 |
| 7standard | 406 | Weed, Bret (1539) | Won 2-0 | +191517 |
| average opponent: 1491record: 4-3 | new rating: 1517 | |||