Deforest, John
Current rating: 1525
Record: 6-5
| Grand Prix Boston 2009 (M10 limited) | starting rating: 1465 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 540 | Beckenbach, Joe (1500) | Won 2-0 | +181483 |
| 2sealed | 546 | Cuenca, Nicolas (1700) | Lost 0-2 | -141469 |
| 3sealed | 644 | Gade, Brandon (1524) | Won 2-0 | +191488 |
| 4sealed | 589 | Pratt, Mick (1517) | Won 2-0 | +191507 |
| 5sealed | 452 | Chu, Tony (1539) | Lost 1-2 | -181489 |
| 6sealed | 536 | Stuart, Blaine (1520) | Won 2-1 | +191508 |
| 7sealed | 505 | Innace, Michael (1474) | Won 2-0 | +171525 |
| 8sealed | 492 | Coval, Brian (1492) | Won 2-0 | +181543 |
| 9sealed | 434 | Dupuis, Deven (1571) | Lost 1-2 | -181525 |
| average opponent: 1537record: 6-3 | new rating: 1525 | |||
| Grand Prix Boston 2003 (LGN limited) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 121 | Fioretta, Scott (1538) | Lost 1-2 | -171483 |
| 2sealed | 200 | Robert, Marc-Andre (1481) | Lost 0-2 | -181465 |
| average opponent: 1510record: 0-2 | new rating: 1465 | |||