Defresco, Joseph R
Current rating: 1503
Record: 2-2
| Grand Prix Boston 2009 (M10 limited) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 2sealed | 73 | McNamara, David (1500) | Won 2-0 | +181518 |
| 3sealed | 95 | Walauski, Travis (1540) | Won 2-1 | +181536 |
| 4sealed | 27 | Cores, Ari (1691) | Lost 1-2 | -151521 |
| 5sealed | 148 | Dixon, Thomas (1536) | Lost 0-2 | -181503 |
| average opponent: 1567record: 2-2 | new rating: 1503 | |||