Zachman, Parker
Current rating: 1511
| Grand Prix Phoenix 2020 (pioneer) | starting rating: 1505 | |||
| round | table | opponent (rating) | result | Δrating |
| 2pioneer | 66 | Thomas, Kenneth (1488) | Won 2-1 | +181523 |
| 3pioneer | 3 | Vinciguerra, Daniele (1843) | Won 2-1 | +241547 |
| 4pioneer | 28 | Hobson, Allen (1463) | Won 2-1 | +161563 |
| 5pioneer | 10 | Ross, Tom (2021) | Lost 1-2 | -101553 |
| 6pioneer | 46 | Bell, Rebecca (1544) | Won 2-1 | +181571 |
| 7pioneer | 47 | Negomir, Ben (1453) | Lost 1-2 | -201551 |
| 8pioneer | 81 | Martin Jr., Charles (1560) | Won 2-1 | +181569 |
| 9pioneer | 81 | Gruneich, Bryce (1703) | Lost 0-2 | -161553 |
| 10pioneer | 3089 | Mooers, Alexander (1771) | Lost 1-2 | -141539 |
| 11pioneer | 3083 | Swenson, Luke (1805) | Lost 0-2 | -131526 |
| 12pioneer | 3092 | Ho, Anthony (1511) | Won 2-1 | +181544 |
| 13pioneer | 3085 | Dugal, Louis-Philippe (1617) | Lost 0-2 | -171527 |
| 14pioneer | 3084 | Hemsley, Matt (1638) | Lost 0-2 | -161511 |
| top | average opponent: 1647record: 6-7 | new rating: 1511 | ||
| Grand Prix Milwaukee 2018 (GRN standard) | starting rating: 1487 | |||
| round | table | opponent (rating) | result | Δrating |
| 1standard | 254 | Livingston, Denise (1101) | Won 2-0 | +111498 |
| 2standard | 286 | Nelson, Brandon (1876) | Lost 0-2 | -111487 |
| 3standard | 364 | Willoughby, Noah (1466) | Lost 0-2 | -191468 |
| 4standard | 523 | Carre, Kiyan (1481) | Won 2-0 | +191487 |
| 5standard | 433 | Kujawa, David (1499) | Won 2-0 | +181505 |
| 6standard | 266 | Williams, Javon (1527) | Won 2-1 | +181523 |
| 7standard | 171 | Faley, Joe (1539) | Lost 0-2 | -181505 |
| top | average opponent: 1498record: 4-3 | new rating: 1505 | ||
| Grand Prix Minneapolis 2018 (M19 limited) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 190 | Frisch, Aidan (1580) | Won 2-0 | +191519 |
| 2sealed | 169 | Rockweit, Anthony (1632) | Lost 1-2 | -151504 |
| 3sealed | 317 | Pinlac, Dunstan (1496) | Won 2-1 | +171521 |
| 4sealed | 422 | Taylor, Benjamin (1534) | Lost 0-2 | -171504 |
| 5sealed | 457 | Denig, Jacob (1572) | Lost 1-2 | -171487 |
| top | average opponent: 1563record: 2-3 | new rating: 1487 | ||