Marquardt, David A
Current rating: 1540
| Grand Prix Pittsburgh 2013 (GTC limited) | starting rating: 1514 | |||
| round | table | opponent (rating) | result | Δrating |
| 2sealed | 50 | Klein, Will R (1643) | Won 2-0 | +211535 |
| 3sealed | 192 | Parson, Justin (1538) | Lost 1-2 | -181517 |
| 4sealed | 359 | Averell, David (1632) | Lost 0-2 | -161501 |
| 5sealed | 487 | Wyatt, John (1528) | Won 2-1 | +181519 |
| 6sealed | 399 | Genna, Peter (1516) | Won 2-1 | +181537 |
| 7sealed | 290 | Kazhdan, Joseph (1675) | Won 2-1 | +211558 |
| 8sealed | 124 | Sun, Blake Chuan Xiang (1574) | Lost 0-2 | -181540 |
| top | average opponent: 1587record: 4-3 | new rating: 1540 | ||
| Grand Prix Indianapolis 2013 (RTR limited) | starting rating: 1537 | |||
| round | table | opponent (rating) | result | Δrating |
| 2sealed | 61 | Sachs, Mitchell (1500) | Won 2-0 | +171554 |
| 3sealed | 111 | Bailey, A.J. (1431) | Lost 1-2 | -201534 |
| 4sealed | 149 | Ciesielczyk, Cody (1454) | Won 2-1 | +161550 |
| 5sealed | 150 | Downs, Mikaela (1623) | Lost 0-2 | -161534 |
| 6sealed | 144 | Miller, Byron (1418) | Won 2-0 | +151549 |
| 7sealed | 163 | Hefner, Jessy (1622) | Lost 0-2 | -161533 |
| 8sealed | 196 | Gerbic, James (1499) | Lost 0-2 | -191514 |
| top | average opponent: 1507record: 3-4 | new rating: 1514 | ||
| Grand Prix Columbus 2012 (modern) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 2modern | 18 | Setree, Chris (1518) | Won 2-0 | +181518 |
| 3modern | 63 | Wehman, Tom (1479) | Lost 0-2 | -181500 |
| 4modern | 350 | Moffitt, James (1594) | Lost 1-2 | -171483 |
| 5modern | 350 | Shelley, Aaron (1466) | Won 2-1 | +181501 |
| 6modern | 194 | Capas, Alec (1464) | Lost 1-2 | -191482 |
| 7modern | 298 | Wayne, Michael (1498) | Won 2-0 | +191501 |
| 8modern | 209 | Jessup, Daniel (1482) | Won 2-0 | +171518 |
| 9modern | 141 | Coats, Michael (1537) | Won 2-0 | +191537 |
| top | average opponent: 1505record: 5-3 | new rating: 1537 | ||