Welsh, Jonathan
Current rating: 1488
Record: 14-16
| Grand Prix Detroit 2016 (modern) | starting rating: 1460 | |||
| round | table | opponent (rating) | result | Δrating |
| 1modern | 141 | Schmitt, Marcus (1500) | Won 2-0 | +181478 |
| 2modern | 505 | Bradshaw, Matthew (1483) | Won 2-0 | +191497 |
| 3modern | 358 | McDuffie, Korey (2042) | Lost 0-2 | -91488 |
| 4modern | 589 | Smith, Blake (1499) | Lost 0-2 | -181470 |
| 5modern | 939 | Shillingford, David (1498) | Lost 1-2 | -181452 |
| 6modern | 971 | Reed, Kosta (1481) | Won 2-1 | +191471 |
| 7modern | 793 | Allen, Zach (1498) | Won 2-0 | +181489 |
| 8modern | 389 | Linseman, Chay (1509) | Lost 0-2 | -171472 |
| 9modern | 556 | Greenidge, Jamal (1386) | Won 2-0 | +161488 |
| top | average opponent: 1544record: 5-4 | new rating: 1488 | ||
| Grand Prix Pittsburgh 2015 (modern) | starting rating: 1455 | |||
| round | table | opponent (rating) | result | Δrating |
| 1modern | 604 | Szegedy, Michael (1465) | Lost 0-2 | -181437 |
| 2modern | 910 | Marasco, Christopher (1481) | Lost 0-2 | -171420 |
| 3modern | 1226 | Konkle, Phillip (1427) | Won 2-1 | +181438 |
| 4modern | 1025 | Witter, Gabriel (1485) | Won 2-1 | +191457 |
| 5modern | 901 | Charette, Nathan (1551) | Won 2-1 | +201477 |
| 6modern | 640 | Miller, Alexander (1517) | Lost 0-2 | -171460 |
| top | average opponent: 1488record: 3-3 | new rating: 1460 | ||
| Grand Prix Cincinnati 2014 (BNG standard) | starting rating: 1430 | |||
| round | table | opponent (rating) | result | Δrating |
| 1standard | 408 | Thao, Sensai (1500) | Won 2-1 | +191449 |
| 2standard | 396 | Pulera, Scott (1501) | Lost 1-2 | -171432 |
| 3standard | 358 | Coyle, Lauren (1491) | Lost 1-2 | -171415 |
| 4standard | 723 | Antosh, Brent (1430) | Won 2-0 | +191434 |
| 5standard | 541 | Nicholson, Trysten (1500) | Won 2-0 | +191453 |
| 6standard | 394 | Daly, Kane (1484) | Won 2-1 | +181471 |
| 7standard | 246 | Sachs, Mitchell (1581) | Lost 0-2 | -161455 |
| top | average opponent: 1498record: 4-3 | new rating: 1455 | ||
| Grand Prix Pittsburgh 2013 (GTC limited) | starting rating: 1445 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 320 | Bender, Joel (1393) | Won 2-0 | +171462 |
| 2sealed | 212 | Carpenter, Kyle (1518) | Lost 1-2 | -171445 |
| 3sealed | 313 | Mayer, Scott (1610) | Lost 0-2 | -151430 |
| top | average opponent: 1507record: 1-2 | new rating: 1430 | ||
| Grand Prix Columbus 2012 (modern) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1modern | 261 | Moses, Joseph S (1500) | Won 2-1 | +181518 |
| 2modern | 68 | Crook, Matthew (1456) | Lost 0-2 | -191499 |
| 3modern | 293 | Golcar, Seth (1499) | Lost 0-2 | -181481 |
| 4modern | 377 | Belty, Alex (1482) | Lost 0-2 | -181463 |
| 5modern | 441 | BRICKEY, JAKE (1464) | Lost 0-2 | -181445 |
| top | average opponent: 1480record: 1-4 | new rating: 1445 | ||