Powell, Mark
Current rating: 1532
Record: 8-6
| Grand Prix Houston 2010 (extended) | starting rating: 1534 | |||
| round | table | opponent (rating) | result | Δrating |
| 1extended | 218 | Green, Edward (1500) | Won 2-1 | +171551 |
| 2extended | 134 | Andrews, Jeremy (1518) | Lost 1-2 | -181533 |
| 3extended | 210 | Wilkinson, George (1443) | Won 2-0 | +161549 |
| 4extended | 170 | Ellis, Ian J (1521) | Won 2-1 | +181567 |
| 5extended | 132 | Sacher, AJ (1703) | Lost 0-2 | -161551 |
| 6extended | 120 | HO, FONG (1517) | Lost 1-2 | -191532 |
| average opponent: 1534record: 3-3 | new rating: 1532 | |||
| Grand Prix Austin 2004 (COK limited) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 70 | Adkins, Joshua (1447) | Lost 1-2 | -191481 |
| 2sealed | 121 | Kirk, Donny (1482) | Won 2-0 | +181499 |
| 3sealed | 67 | Smart, Jason (1500) | Lost 0-2 | -181481 |
| 4sealed | 137 | Decovic, Stephen (1481) | Won 2-0 | +181499 |
| 5sealed | 120 | Saleh, Keyafar (1501) | Won 2-1 | +181517 |
| 6sealed | 82 | Clarke, James E (1518) | Won 2-0 | +181535 |
| 7sealed | 42 | South, Ryan (1517) | Won 2-1 | +181553 |
| 8sealed | 48 | Olivet, Andrew (1508) | Lost 1-2 | -191534 |
| average opponent: 1494record: 5-3 | new rating: 1534 | |||