Sumpter, Sam
Current rating: 1567
Record: 8-5-1
| Grand Prix Oklahoma City 2015 (modern) | starting rating: 1482 | |||
| round | table | opponent (rating) | result | Δrating |
| 1modern | 1023 | Peace, John (1431) | Won 2-1 | +171499 |
| 2modern | 123 | Lo, Steven (1684) | Draw 1-1 | +31502 |
| 3modern | 257 | Langton, Buddy (1546) | Won 0-0 | +191521 |
| 4modern | 148 | George, Zach (1538) | Won 2-0 | +181539 |
| 5modern | 74 | Lowery, Skyler (1554) | Lost 0-2 | -171522 |
| 6modern | 167 | Hiett, Johnathan (1449) | Won 2-1 | +161538 |
| 7modern | 106 | Steele, Derrick (1718) | Won 2-0 | +221560 |
| 8modern | 60 | Cheon, Paul (1932) | Won 2-1 | +241584 |
| 9modern | 37 | Herron, Devon (1651) | Lost 0-2 | -171567 |
| average opponent: 1611record: 6-2-1 | new rating: 1567 | |||
| Grand Prix Omaha 2015 (modern) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1modern | 171 | Bowker, Sam (1500) | Won 2-0 | +181518 |
| 2modern | 64 | Carlson, Eric (1486) | Won 2-0 | +171535 |
| 3modern | 87 | [anonymous] | Lost 0-2 | -161519 |
| 4modern | 305 | Crittenden, Eli (1518) | Lost 0-2 | -181501 |
| 5modern | 366 | Kramer, Jeffrey (1434) | Lost 0-2 | -191482 |
| average opponent: 1515record: 2-3 | new rating: 1482 | |||