McMahon, David
Current rating: 1449
| Grand Prix Montreal 2014 (BNG limited) | starting rating: 1446 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 119 | Cortese, Giuseppe (1500) | Won 2-0 | +191465 |
| 2sealed | 329 | Monast, David (1594) | Lost 1-2 | -161449 |
| top | average opponent: 1547record: 1-1 | new rating: 1449 | ||
| Grand Prix Detroit 2013 (modern) | starting rating: 1464 | |||
| round | table | opponent (rating) | result | Δrating |
| 1modern | 152 | Schilz, Lucas (1500) | Draw 1-1 | +11465 |
| 2modern | 344 | Benson, Riley (1427) | Lost 0-0 | -191446 |
| 3modern | 570 | Allen, Christian R (1412) | Won 2-1 | +171463 |
| 4modern | 489 | Elliott, Joseph (1499) | Lost 0-2 | -171446 |
| top | average opponent: 1459record: 1-2-1 | new rating: 1446 | ||
| Grand Prix Toronto 2010 (SOM limited) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 538 | Schinkel, Scott A (1500) | Lost 0-2 | -181482 |
| 2sealed | 533 | Daigle, Christopher (1483) | Lost 1-2 | -181464 |
| 3sealed | 602 | Fawcett, Penny (1464) | Won 2-0 | +181482 |
| 4sealed | 608 | Smith, Brenda (1482) | Lost 0-2 | -181464 |
| top | average opponent: 1482record: 1-3 | new rating: 1464 | ||