Jeffery, Ammon
Current rating: 1449
Record: 3-6
| Grand Prix Houston 2013 (DGM limited) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 128 | Kelone, Derek (1500) | Won 2-1 | +181518 |
| 2sealed | 35 | Pena, James (1500) | Lost 1-2 | -181500 |
| 3sealed | 162 | Jones, Jay (1502) | Lost 1-2 | -181482 |
| 4sealed | 333 | Dalton, Kirk (1646) | Won 2-1 | +211503 |
| 5sealed | 291 | Estepp, Kellie (1502) | Lost 1-2 | -181485 |
| 6sealed | 273 | Yuen, Timothy (1486) | Lost 1-2 | -181467 |
| 7sealed | 84 | Ellingsen, Jarle (1469) | Lost 1-2 | -181449 |
| 8sealed | 200 | Pomeroy, William (1445) | Lost 0-2 | -181431 |
| 9sealed | 168 | Canales, David (1429) | Won 2-1 | +181449 |
| average opponent: 1498record: 3-6 | new rating: 1449 | |||