Shaffer, Jonathan
Current rating: 1551
Record: 11-8
| Grand Prix Atlanta 2015 (BFZ limited) | starting rating: 1561 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 274 | Berry, Brandon (1398) | Won 2-0 | +151576 |
| 2sealed | 414 | Paustian, Maxwell (1501) | Lost 1-2 | -191557 |
| 3sealed | 499 | Horn, Nathan (1519) | Won 2-1 | +171574 |
| 4sealed | 385 | Bottinelli, Stephen (1427) | Won 2-1 | +161590 |
| 5sealed | 422 | Lowther, Kevin (1505) | Lost 0-2 | -201570 |
| 6sealed | 365 | Savoia, Michael (1520) | Lost 0-2 | -191551 |
| average opponent: 1478record: 3-3 | new rating: 1551 | |||
| Grand Prix Charlotte 2015 (modern) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1modern | 259 | Cronin, Jonathan (1549) | Won 2-1 | +191519 |
| 2modern | 251 | Ahmeti, Enver (1654) | Won 2-0 | +201539 |
| 3modern | 249 | Bigford, Roland (1431) | Won 2-1 | +161555 |
| 4modern | 213 | Cravens, Billy (1617) | Won 2-1 | +201575 |
| 5modern | 214 | Crowley, Nicholas (1603) | Won 2-1 | +181593 |
| 6modern | 219 | Conley, Kieran (1669) | Lost 1-2 | -171576 |
| 7modern | 294 | McClenathan, Sean (1679) | Won 2-1 | +201596 |
| 8modern | 408 | Hinckley, Scott A (1560) | Lost 1-2 | -181578 |
| 9modern | 235 | Barkon, Daniel (1590) | Won 2-1 | +181596 |
| 10modern | 678 | Lisac, Chris (1598) | Lost 1-2 | -181578 |
| 11modern | 757 | Berry, Maxwell (1541) | Lost 1-2 | -191559 |
| 12modern | 762 | Kangas, Eric (1563) | Won 2-0 | +181577 |
| 13modern | 718 | Sadowsky, Joel (1684) | Lost 1-2 | -161561 |
| average opponent: 1595record: 8-5 | new rating: 1561 | |||