Shaffer, Jacob
Current rating: 1486
Record: 5-6
| Grand Prix Lincoln 2012 (modern) | starting rating: 1485 | |||
| round | table | opponent (rating) | result | Δrating |
| 1modern | 111 | Prusha, Rick (1500) | Lost 1-2 | -181467 |
| 2modern | 214 | Boehm, Mike (1394) | Won 2-0 | +171484 |
| 3modern | 142 | Williamson, Colin (1502) | Lost 0-2 | -181466 |
| 4modern | 255 | Hoppe, Scott (1482) | Won 2-0 | +181484 |
| 5modern | 193 | Wolfe, Chris L (1504) | Won 2-0 | +191503 |
| 6modern | 149 | Wilkerson, Joseph (1585) | Lost 0-2 | -171486 |
| average opponent: 1495record: 3-3 | new rating: 1486 | |||
| Grand Prix Kansas City 2011 (NPH limited) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 54 | Drahos, Dan (1484) | Lost 0-2 | -181482 |
| 2sealed | 291 | Thorp, Zachary W (1538) | Won 2-0 | +191501 |
| 3sealed | 170 | Segarra, Andre (1543) | Lost 1-2 | -181483 |
| 4sealed | 315 | Seals, David A (1483) | Won 2-1 | +181501 |
| 5sealed | 293 | Gabbert, Charles (1571) | Lost 0-2 | -161485 |
| average opponent: 1524record: 2-3 | new rating: 1485 | |||