Matteson, Geoff J
Current rating: 1484
Record: 4-5
| Grand Prix Philadelphia 2008 (extended) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1extended | 49 | Kuligowski, Kimberly (1500) | Won 2-0 | +181518 |
| 2extended | 140 | Akeley, Peter (1570) | Won 2-1 | +191537 |
| 3extended | 21 | Swoyer, Mark (1601) | Lost 0-2 | -171520 |
| 4extended | 228 | Rieg, Evan M (1518) | Lost 1-2 | -181502 |
| 5extended | 279 | Froehlich, Eric (1475) | Lost 1-2 | -181484 |
| 6extended | 297 | Irwin, Russell (1446) | Won 2-0 | +171501 |
| 7extended | 261 | Gosselin, Christopher (1603) | Won 2-1 | +201521 |
| 8extended | 169 | Jones, John C (1494) | Lost 0-2 | -191502 |
| 9extended | 166 | Crane, Patrick (1461) | Lost 0-2 | -181484 |
| average opponent: 1519record: 4-5 | new rating: 1484 | |||