Marsh, David
Current rating: 1410
| Grand Prix Atlantic City 2015 (DTK limited) | starting rating: 1449 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 368 | Carione, Joseph (1396) | Lost 0-2 | -191430 |
| 2sealed | 570 | Featherer, Charles (1357) | Lost 0-2 | -201410 |
| top | average opponent: 1376record: 0-2 | new rating: 1410 | ||
| Grand Prix Philadelphia 2014 (BNG limited) | starting rating: 1501 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 329 | Yatsenko, Alex (1583) | Lost 1-2 | -161485 |
| 2sealed | 479 | Markowicz, Eric (1491) | Lost 1-2 | -181467 |
| 3sealed | 767 | Danser, Shawon (1462) | Lost 0-2 | -181449 |
| top | average opponent: 1512record: 0-3 | new rating: 1449 | ||
| Grand Prix Philadelphia 2000 (extended) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1extended | 32 | Board, Kenneth (1500) | Lost 0-0 | -181482 |
| 2extended | 218 | Potter, Skip (1464) | Won 0-0 | +181500 |
| 3extended | 192 | Schneider, Brian (1604) | Lost 0-0 | -161484 |
| 4extended | 206 | Hart, Keith (1466) | Won 0-0 | +171501 |
| 5extended | 143 | Craddle Jr., Lemuel (1498) | Won 0-0 | +181519 |
| 6extended | 115 | Holt, Terry (1518) | Lost 0-0 | -181501 |
| top | average opponent: 1508record: 3-3 | new rating: 1501 | ||