Purkes, Zach
Current rating: 1485
Record: 11-14
| Grand Prix Portland 2019 (ELD standard) | starting rating: 1402 | |||
| round | table | opponent (rating) | result | Δrating |
| 1standard | 97 | Chen, Miley (1486) | Lost 1-2 | -171385 |
| 2standard | 148 | Pall-Pareek, Aditya (1544) | Lost 0-2 | -151370 |
| 3standard | 224 | Tongue, Jason (1464) | Won 0-0 | +201390 |
| 4standard | 173 | Hernandez, Ruben (1330) | Won 2-0 | +171407 |
| 5standard | 186 | Tan, Ray (1392) | Won 2-0 | +171424 |
| 6standard | 101 | Philbrook, Christopher (1483) | Won 2-0 | +191443 |
| 7standard | 103 | Fosberg, Sam (1442) | Won 2-1 | +181461 |
| 8standard | 33 | Breaden, Chase (1559) | Won 2-1 | +201481 |
| 9standard | 38 | Brueseke, Benjamin (1802) | Won 2-1 | +241505 |
| 10standard | 29 | Damaske, David (1630) | Lost 1-2 | -161489 |
| 11standard | 34 | O'Connor, Michael (1686) | Won 2-1 | +221511 |
| 12standard | 22 | Hoban, Liam [CAN] (1647) | Lost 1-2 | -161495 |
| 13standard | 38 | Blake, Paul (1596) | Won 2-0 | +201515 |
| 14standard | 27 | Glass, Campbell (1795) | Lost 1-2 | -131502 |
| 15standard | 36 | Guthrie, Alex (1586) | Lost 0-2 | -171485 |
| top | average opponent: 1563record: 9-6 | new rating: 1485 | ||
| Grand Prix Seattle 2018 (standard) (RIX standard) | starting rating: 1433 | |||
| round | table | opponent (rating) | result | Δrating |
| 1standard | 450 | Girard, Andre (1559) | Lost 1-2 | -161417 |
| 2standard | 382 | Deyoe, Roman (1483) | Lost 0-2 | -161401 |
| 3standard | 606 | Freeborne, Jay (1465) | Won 2-0 | +191420 |
| 4standard | 521 | Kaipainen, Anttu (1415) | Lost 0-2 | -181402 |
| top | average opponent: 1480record: 1-3 | new rating: 1402 | ||
| Grand Prix Seattle 2018 (legacy) (legacy) | starting rating: 1450 | |||
| round | table | opponent (rating) | result | Δrating |
| 1legacy | 276 | Wagenfuhr, Michael (1530) | Lost 0-2 | -171433 |
| top | record: 0-1 | new rating: 1433 | ||
| Grand Prix Portland 2017 (XLN standard) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1standard | 492 | Kochel, Jeremy (1500) | Won 2-0 | +181518 |
| 2standard | 149 | Downey, Shane (1745) | Lost 0-2 | -141504 |
| 3standard | 582 | Harberg, Nicholas (1467) | Lost 1-2 | -191485 |
| 4standard | 691 | Magallanes, Luis (1532) | Lost 0-2 | -171468 |
| 5standard | 701 | Felger, Scott (1430) | Lost 0-2 | -181450 |
| top | average opponent: 1535record: 1-4 | new rating: 1450 | ||