Jamrog, Jonathan
Current rating: 1428
Record: 10-15-1
| Grand Prix Las Vegas 2017 (legacy) (legacy) | starting rating: 1438 | |||
| round | table | opponent (rating) | result | Δrating |
| 1legacy | 287 | Bates, Richard (1437) | Won 2-0 | +181456 |
| 2legacy | 113 | Nguyen, Daniel (1691) | Won 2-0 | +221478 |
| 3legacy | 2101 | Kent, Doug (1542) | Lost 0-2 | -171461 |
| 4legacy | 482 | Chang, Charlie (1473) | Lost 0-2 | -171444 |
| 5legacy | 889 | Bailey, Tyler (1476) | Won 2-1 | +181462 |
| 6legacy | 496 | Denn, Steven (1543) | Lost 0-2 | -161446 |
| 7legacy | 752 | Stone, Tim (1471) | Lost 1-2 | -181428 |
| top | average opponent: 1519record: 3-4 | new rating: 1428 | ||
| Grand Prix Columbus 2016 (legacy) | starting rating: 1435 | |||
| round | table | opponent (rating) | result | Δrating |
| 1legacy | 506 | Spiesz, Brennan (1500) | Lost 0-2 | -171418 |
| 2legacy | 626 | Rubenstein, Allan (1473) | Lost 0-2 | -171401 |
| 3legacy | 817 | Pagnani, Alexander (1406) | Lost 1-2 | -181383 |
| 4legacy | 843 | Ertel, Trevor (1323) | Lost 0-2 | -191364 |
| 5legacy | 836 | McLean, Dallas (1426) | Won 2-1 | +191383 |
| 6legacy | 764 | Flores, Ricky (1444) | Won 2-0 | +191402 |
| 7legacy | 632 | Kroeger, Brett (1417) | Won 2-0 | +181420 |
| 8legacy | 503 | Tarman, Cody (1402) | Won 2-0 | +181438 |
| top | average opponent: 1424record: 4-4 | new rating: 1438 | ||
| Grand Prix New Jersey 2014 (legacy) | starting rating: 1464 | |||
| round | table | opponent (rating) | result | Δrating |
| 1legacy | 358 | Anderson, Gary (1460) | Lost 0-2 | -181446 |
| 2legacy | 512 | Horn, Nicole (1482) | Won 2-1 | +181464 |
| 3legacy | 450 | Ritter, Brian (1498) | Lost 0-2 | -171447 |
| 4legacy | 527 | Dorgan, Kyle (1603) | Draw 1-1 | +31450 |
| 5legacy | 490 | Fiduccia, Matthew (1481) | Lost 1-2 | -181432 |
| 6legacy | 457 | Farrell, Alexander (1567) | Won 2-1 | +211453 |
| 7legacy | 349 | Downey, Ken (1447) | Lost 0-2 | -181435 |
| top | average opponent: 1505record: 2-4-1 | new rating: 1435 | ||
| Grand Prix Boston-Worcester 2014 (modern) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1modern | 925 | Dituri, Philip (1428) | Lost 0-2 | -191481 |
| 2modern | 1095 | Roberts, Russell (1482) | Lost 1-2 | -181463 |
| 3modern | 1202 | Sprague, Kevin (1463) | Won 2-1 | +181481 |
| 4modern | 1142 | Fisher, Ryan (1531) | Lost 0-2 | -171464 |
| top | average opponent: 1476record: 1-3 | new rating: 1464 | ||