Powell, Ben
Current rating: 1420
| Grand Prix Washington DC 2013 (legacy) | starting rating: 1494 | |||
| round | table | opponent (rating) | result | Δrating |
| 1legacy | 182 | Dronfield, Stephen (1500) | Lost 0-2 | -181476 |
| 2legacy | 538 | Rogers, Kevin (1412) | Lost 0-2 | -191457 |
| 3legacy | 736 | Zielinski, Jason (1411) | Lost 0-2 | -191438 |
| 4legacy | 786 | Savino, Daniel (1448) | Lost 0-2 | -181420 |
| top | average opponent: 1443record: 0-4 | new rating: 1420 | ||
| Grand Prix Detroit 2013 (modern) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1modern | 367 | Zheng, Yuanshan (1547) | Lost 0-2 | -171483 |
| 2modern | 422 | Davis, Del (1482) | Won 0-0 | +181501 |
| 3modern | 425 | McCauley, Devin (1500) | Won 2-0 | +181519 |
| 4modern | 310 | Lundquist, Ben (2057) | Lost 1-2 | -91510 |
| 5modern | 394 | Schneider, Oliver (1645) | Lost 0-2 | -161494 |
| top | average opponent: 1646record: 2-3 | new rating: 1494 | ||
| Grand Prix Birmingham 2004 (DST limited) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 185 | Burns, Lawrence (1500) | Lost 0-2 | -181482 |
| 2sealed | 229 | Russell, Phillippa (1482) | Won 2-0 | +181500 |
| top | average opponent: 1491record: 1-1 | new rating: 1500 | ||