Jeffers, Zachary L
Current rating: 1464
| Grand Prix Portland 2013 (modern) | starting rating: 1520 | |||
| round | table | opponent (rating) | result | Δrating |
| 1modern | 238 | Piggott, Michael (1500) | Lost 1-2 | -181502 |
| 2modern | 260 | Ellis, Jack (1437) | Lost 0-2 | -191483 |
| 3modern | 391 | Curtin, Matthew (1465) | Lost 0-2 | -191464 |
| top | average opponent: 1467record: 0-3 | new rating: 1464 | ||
| Grand Prix Anaheim 2012 (Innistrad block) | starting rating: 1521 | |||
| round | table | opponent (rating) | result | Δrating |
| 2block | 136 | Kislek, Andy (1518) | Lost 1-2 | -181503 |
| 3block | 205 | Gasgonia, Benedict (1506) | Lost 1-2 | -181485 |
| 4block | 365 | Drennon, Phillip (1447) | Won 2-1 | +181503 |
| 5block | 271 | Dyer, Jason (1503) | Won 2-0 | +181521 |
| 6block | 195 | McCormack, Conor (1535) | Won 2-0 | +181539 |
| 7block | 130 | Wong, Gary (1495) | Lost 0-2 | -191520 |
| top | average opponent: 1501record: 3-3 | new rating: 1520 | ||
| Grand Prix Salt Lake City 2012 (DKA standard) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1standard | 242 | Felker, Daniel (1500) | Lost 1-2 | -181482 |
| 2standard | 331 | Small, Eli (1482) | Won 2-0 | +181500 |
| 3standard | 251 | Munson, Jeremiah (1483) | Won 2-1 | +181518 |
| 4standard | 271 | Fullmer, Randy (1507) | Lost 1-2 | -181500 |
| 5standard | 292 | Allart, Schuyler (1500) | Won 2-0 | +181518 |
| 6standard | 288 | Demoss, Charlie E (1484) | Won 2-0 | +171535 |
| 7standard | 144 | Padilla, Travis (1649) | Won 2-1 | +201555 |
| 8standard | 70 | Beach, Harrison (1688) | Lost 1-2 | -161539 |
| 9standard | 125 | Williams, Rachael (1542) | Lost 1-2 | -181521 |
| top | average opponent: 1537record: 5-4 | new rating: 1521 | ||