Tewksbury, Joseph
Current rating: 1423
| Grand Prix Charlotte 2013 (GTC limited) | starting rating: 1440 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 760 | Gyongyos, Ellis (1500) | Lost 0-2 | -171423 |
| top | record: 0-1 | new rating: 1423 | ||
| Grand Prix Charleston 2012 (RTR standard) | starting rating: 1408 | |||
| round | table | opponent (rating) | result | Δrating |
| 1standard | 197 | Gross, Robert (1481) | Won 0-0 | +201428 |
| 2standard | 21 | White, Justin (1706) | Won 2-0 | +231451 |
| 3standard | 44 | Auburn, Andrew (1512) | Lost 1-2 | -171434 |
| 4standard | 204 | Bertarioni, Jeremy (1517) | Won 2-0 | +191453 |
| 5standard | 115 | Akers, Jeffrey (1535) | Won 2-1 | +201473 |
| 6standard | 68 | Peretz, Michael (1461) | Lost 0-2 | -181455 |
| 7standard | 72 | Nybo, Conrad (1533) | Lost 0-2 | -171438 |
| 8standard | 142 | Casey, Shawn (1473) | Won 1-0 | +191457 |
| 9standard | 107 | Gamble, Steven (1535) | Lost 0-2 | -171440 |
| top | average opponent: 1528record: 5-4 | new rating: 1440 | ||
| Grand Prix Atlanta 2012 (legacy) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1legacy | 148 | Rial, Joshua H (1500) | Lost 0-2 | -181482 |
| 2legacy | 262 | Blair, Molly (1456) | Lost 0-2 | -181464 |
| 3legacy | 359 | Grace, Jared (1464) | Lost 0-2 | -181446 |
| 4legacy | 437 | Vander Ploeg, Kristofer (1445) | Lost 0-2 | -181428 |
| 5legacy | 419 | Pringle, Rayan (1427) | Lost 1-2 | -181410 |
| 6legacy | 389 | Cunningham, Quienton (1407) | Lost 1-2 | -191391 |
| 7legacy | 346 | Bergan, Gerald (1336) | Won 2-0 | +171408 |
| 8legacy | 299 | Moore, Bryan (1411) | Won 2-0 | +191427 |
| 9legacy | 262 | Trayah, Kyle (1422) | Lost 0-2 | -191408 |
| top | average opponent: 1430record: 2-7 | new rating: 1408 | ||