Powderly, John C
Current rating: 1562
Record: 6-3
| Grand Prix Kansas City 2011 (NPH limited) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 62 | Salter, Dustin (1500) | Won 2-0 | +181518 |
| 2sealed | 18 | Pargh, William (1598) | Lost 0-2 | -171501 |
| 3sealed | 165 | Emmons, Logan (1500) | Won 2-0 | +181519 |
| 4sealed | 157 | Tidwell, Terry (1518) | Won 2-1 | +181537 |
| 5sealed | 98 | Joshua S., (1539) | Won 2-0 | +181555 |
| 6sealed | 58 | Blankenship, Arthur (1616) | Won 2-0 | +201575 |
| 7sealed | 37 | Kibler, Brian (1810) | Won 2-1 | +221597 |
| 8sealed | 25 | Jordan, Michael (1513) | Lost 0-2 | -201577 |
| 9sealed | 35 | Black, Samuel (1748) | Lost 0-2 | -151562 |
| average opponent: 1594record: 6-3 | new rating: 1562 | |||