Marston, John
Current rating: 1481
Record: 2-3
| Grand Prix New Orleans 2003 (extended) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1extended | 13 | Stroup, Brandon (1447) | Lost 1-2 | -191481 |
| 2extended | 117 | Champagne, Cory (1482) | Won 2-0 | +181499 |
| 3extended | 121 | Canu, Michael (1500) | Lost 0-2 | -181481 |
| 4extended | 163 | Vuk, Velimir (1482) | Won 2-0 | +181499 |
| 5extended | 134 | Bergquist, Peter (1512) | Lost 0-2 | -181481 |
| average opponent: 1485record: 2-3 | new rating: 1481 | |||