Demonbreun, Mark
Current rating: 1424
Record: 3-8-1
| Grand Prix Nashville 2010 (SOM limited) | starting rating: 1450 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 90 | Doyle, Troy D (1537) | Won 2-1 | +191469 |
| 2sealed | 121 | Conyers, Melvin (1463) | Lost 0-2 | -181451 |
| 3sealed | 170 | Hart, Ryan B (1500) | Lost 0-2 | -171434 |
| 4sealed | 295 | Baumgartner, Justin (1481) | Won 2-0 | +191453 |
| 5sealed | 191 | Wise, Wesley (1601) | Lost 1-2 | -151438 |
| 6sealed | 209 | Becker, Philip (1484) | Won 2-0 | +181456 |
| 7sealed | 163 | Nagy, Andrew (1625) | Lost 1-2 | -151441 |
| 8sealed | 124 | Berrios, Carlos (1482) | Lost 0-2 | -171424 |
| average opponent: 1522record: 3-5 | new rating: 1424 | |||
| Grand Prix Las Vegas 2001 (extended) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 4extended | 53 | linn, gerald (1554) | Draw 1-1 | +11501 |
| 5extended | 37 | Atherton, William (1560) | Lost 0-2 | -171484 |
| 6extended | 64 | Wright, Cody (1518) | Lost 1-2 | -171467 |
| 7extended | 90 | Lee, Tal (1517) | Lost 0-2 | -171450 |
| average opponent: 1537record: 0-3-1 | new rating: 1450 | |||