Shackelfurd, Preston
Current rating: 1423
Record: 9-15
| Grand Prix Atlanta 2015 (BFZ limited) | starting rating: 1445 | |||
| round | table | opponent (rating) | result | Δrating |
| 3sealed | 287 | Metcalf, Daniel (1536) | Won 2-1 | +191464 |
| 4sealed | 95 | Frederick, Jacob (1697) | Lost 1-2 | -131451 |
| 5sealed | 285 | Durham, Lucas (1545) | Lost 1-2 | -171434 |
| 6sealed | 467 | Gatica, Miguel (1843) | Lost 1-2 | -111423 |
| top | average opponent: 1655record: 1-3 | new rating: 1423 | ||
| Grand Prix Charlotte 2015 (modern) | starting rating: 1519 | |||
| round | table | opponent (rating) | result | Δrating |
| 2modern | 272 | Gavlik, Michael (1518) | Lost 0-2 | -181501 |
| 3modern | 486 | Cronin, Jonathan (1548) | Lost 0-2 | -171484 |
| 4modern | 500 | Eleazer, Bennett (1482) | Lost 0-2 | -181466 |
| 5modern | 571 | Kollar, Rob (1461) | Won 2-1 | +181484 |
| 6modern | 495 | Koval, Scott (1332) | Lost 0-2 | -211463 |
| 7modern | 469 | Boyle, Charles M (1464) | Lost 1-2 | -181445 |
| top | average opponent: 1468record: 1-5 | new rating: 1445 | ||
| Grand Prix Miami 2015 (FRF standard) | starting rating: 1452 | |||
| round | table | opponent (rating) | result | Δrating |
| 1standard | 113 | Schoose, John (1561) | Won 2-0 | +201472 |
| 2standard | 152 | Bigalli, Federico (1517) | Won 2-1 | +181490 |
| 3standard | 99 | LaPille, Thomas (1678) | Lost 1-2 | -141476 |
| 4standard | 336 | Downing, Eric (1622) | Won 2-0 | +211497 |
| 5standard | 173 | Martinolich, Hannah (1478) | Won 2-1 | +171514 |
| 6standard | 141 | Belty, Alex (1489) | Lost 1-2 | -181496 |
| 7standard | 256 | Figueroa, Milton (1698) | Won 2-0 | +211517 |
| 8standard | 142 | Mccleskey, Drake (1556) | Won 2-0 | +191536 |
| 9standard | 55 | Noonan, Christopher (1577) | Lost 1-2 | -171519 |
| top | average opponent: 1575record: 6-3 | new rating: 1519 | ||
| Grand Prix Orlando 2014 (KTK limited) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 3sealed | 93 | Kobashigawa, Davin (1421) | Won 2-1 | +171517 |
| 4sealed | 35 | dos Santos Vieira, Eduardo (1794) | Lost 0-2 | -141503 |
| 5sealed | 177 | Jones, Greg (1526) | Lost 1-2 | -171486 |
| 6sealed | 208 | Seely, Kevin (1521) | Lost 1-2 | -171469 |
| 7sealed | 232 | Martinez, Etienne (1531) | Lost 0-2 | -171452 |
| top | average opponent: 1559record: 1-4 | new rating: 1452 | ||