Mattes, John
Current rating: 1540
Record: 5-3
| Grand Prix Seattle 2005 (extended) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1extended | 70 | Turner, Thomas (1500) | Won 1-0 | +181518 |
| 2extended | 49 | Lepinski, Christopher (1558) | Won 2-1 | +191537 |
| 3extended | 2 | Teuber, Derrick (1518) | Won 2-0 | +171554 |
| 4extended | 42 | Green, Robert (1500) | Won 2-1 | +171571 |
| 5extended | 8 | Twarog, Eric (1552) | Won 2-0 | +181589 |
| 6extended | 10 | Linde, Dylan (1577) | Lost 1-2 | -181571 |
| 7extended | 29 | Nakamura, Shuhei (1907) | Lost 0-2 | -121559 |
| 8extended | 33 | Durnan, Harry (1519) | Lost 0-2 | -191540 |
| average opponent: 1579record: 5-3 | new rating: 1540 | |||