Stamm, Jefferey
Current rating: 1443
| Grand Prix Richmond 2018 (std) (M19 standard) | starting rating: 1481 | |||
| round | table | opponent (rating) | result | Δrating |
| 1standard | 51 | Gordon, Ted (1368) | Lost 1-2 | -201461 |
| 2standard | 170 | Ellenberger, Jarrod (1413) | Lost 1-2 | -191442 |
| 3standard | 343 | Brasdovich, Peter (1482) | Won 2-1 | +191461 |
| 4standard | 282 | Van Cleef, Josh (1487) | Lost 0-2 | -181443 |
| top | average opponent: 1437record: 1-3 | new rating: 1443 | ||
| Grand Prix Washington DC 2017 (HOU standard) | starting rating: 1520 | |||
| round | table | opponent (rating) | result | Δrating |
| 1standard | 20 | Cardwell, Matthew (1500) | Lost 0-2 | -181502 |
| 2standard | 431 | Sparling, Jonah (1482) | Lost 0-2 | -191483 |
| 3standard | 660 | Hershey, Samuel (1464) | Won 2-0 | +181501 |
| 4standard | 654 | VanBuskirk, Jason (1430) | Won 2-1 | +171518 |
| 5standard | 387 | Neme-Micula, William (1488) | Lost 0-2 | -191499 |
| 6standard | 538 | Pellicier, Jorge (1505) | Lost 0-2 | -181481 |
| top | average opponent: 1478record: 2-4 | new rating: 1481 | ||
| Grand Prix New Jersey 2014 (legacy) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1legacy | 920 | Marshall, Bob (1527) | Lost 1-2 | -171483 |
| 2legacy | 1143 | DiRienzo, Thomas (1483) | Lost 1-2 | -181465 |
| 3legacy | 1329 | Petrocelli, Erica (1469) | Won 2-0 | +181483 |
| 4legacy | 1150 | Steltz, Demian (1483) | Won 2-0 | +181501 |
| 5legacy | 878 | Shipp, Jonathan (1501) | Lost 1-2 | -181483 |
| 6legacy | 998 | Bauer, Michael (1569) | Won 2-1 | +191502 |
| 7legacy | 865 | Rivera, Manuel (1504) | Won 2-0 | +181520 |
| 8legacy | 777 | Herrholz, James (1503) | Won 2-0 | +181538 |
| 9legacy | 731 | Chau, David (1540) | Lost 0-2 | -181520 |
| top | average opponent: 1509record: 5-4 | new rating: 1520 | ||