Powell, Michael
Current rating: 1438
| Grand Prix Detroit 2005 (BOK limited) | starting rating: 1450 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 33 | Dunfee, William (1500) | Lost 0-2 | -181432 |
| 2sealed | 167 | Zull, Chris (1482) | Lost 0-2 | -171415 |
| 3sealed | 193 | Clark, Matthew (1429) | Won 2-1 | +191434 |
| 4sealed | 193 | Markovic, Mike (1482) | Lost 0-2 | -181416 |
| 5sealed | 182 | Elsey, Nicholas (1465) | Won 2-0 | +191435 |
| 6sealed | 145 | Michalik, David (1486) | Lost 0-2 | -171418 |
| 7sealed | 118 | Brown, Steve (1487) | Won 2-0 | +201438 |
| top | average opponent: 1476record: 3-4 | new rating: 1438 | ||
| Grand Prix Columbus 2004 (DST limited) | starting rating: 1481 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 41 | Monnin, Richard (1500) | Won 2-1 | +191500 |
| 2sealed | 72 | Hansard, Brendon (1518) | Lost 1-2 | -181482 |
| 3sealed | 183 | McClasky, Derek (1630) | Lost 1-2 | -151467 |
| 4sealed | 347 | Bates, John (1482) | Lost 0-2 | -181449 |
| 5sealed | 304 | Sellers, Jeremiah (1463) | Won 2-0 | +181467 |
| 6sealed | 223 | Plachta, Jake (1482) | Lost 0-2 | -171450 |
| top | average opponent: 1513record: 2-4 | new rating: 1450 | ||
| Grand Prix Detroit 2001 (PLS limited) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 140 | Savage, John (1500) | Lost 0-2 | -181482 |
| 2sealed | 235 | Schneider, Trevor (1482) | Won 2-0 | +181500 |
| 3sealed | 189 | Steiglitz, Barry (1500) | Lost 1-2 | -181482 |
| 4sealed | 253 | Clark, Christopher (1464) | Won 2-0 | +181500 |
| 5sealed | 174 | Levi, Daniel (1483) | Lost 1-2 | -191481 |
| top | average opponent: 1486record: 2-3 | new rating: 1481 | ||