Winkelman, Matthew P
Current rating: 1554
Record: 5-2-1
| Grand Prix Philadelphia 2008 (extended) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1extended | 251 | Gelb, Evan (1500) | Draw 1-1 | 01500 |
| 2extended | 254 | Lysinger, Chris (1501) | Lost 1-2 | -181482 |
| 3extended | 380 | Izsak, Yoel (1481) | Won 2-0 | +181500 |
| 4extended | 311 | Wyatt, Phil (1505) | Won 2-1 | +181518 |
| 5extended | 216 | Smith, Oswell S (1513) | Lost 1-2 | -181500 |
| 6extended | 285 | Ringley, Matheau D (1471) | Won 2-1 | +171517 |
| 7extended | 203 | Bennett, Ross (1519) | Won 2-0 | +191536 |
| 8extended | 147 | Thompson, Noel (1537) | Won 2-1 | +181554 |
| average opponent: 1504record: 5-2-1 | new rating: 1554 | |||