Zelkowski, Jeffrey
Current rating: 1487
Record: 6-7
| Grand Prix Atlanta 2017 (XLN standard) | starting rating: 1525 | |||
| round | table | opponent (rating) | result | Δrating |
| 1standard | 227 | Beasley, Shanice (1343) | Won 2-0 | +141539 |
| 2standard | 19 | Archey, Roy (1518) | Lost 0-2 | -181521 |
| 3standard | 512 | Cummings, Caleb (1568) | Lost 0-2 | -171504 |
| 4standard | 533 | Sandow, Lee (1583) | Lost 1-2 | -171487 |
| average opponent: 1503record: 1-3 | new rating: 1487 | |||
| Grand Prix New Jersey 2017 (std) (AER standard) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1standard | 151 | Mann, Corey (1608) | Lost 1-2 | -161484 |
| 2standard | 425 | Delgra, Alphonsus (1484) | Won 2-0 | +181502 |
| 3standard | 596 | Petitt, Drew (1500) | Won 2-1 | +181520 |
| 4standard | 237 | Apel, James (1523) | Lost 0-2 | -181502 |
| 5standard | 455 | Gunn, Thomas (1433) | Won 2-1 | +171519 |
| 6standard | 440 | Abrams, Colton (1563) | Lost 1-2 | -171502 |
| 7standard | 446 | Robbins, Adam (1498) | Won 2-1 | +171519 |
| 8standard | 345 | Boston, Neil (1517) | Won 2-0 | +181537 |
| 9standard | 332 | Weitz, Benjamin (1826) | Lost 0-2 | -121525 |
| average opponent: 1550record: 5-4 | new rating: 1525 | |||