Dufek, Jacob
Current rating: 1566
| Grand Prix Phoenix 2020 (pioneer) | starting rating: 1575 | |||
| round | table | opponent (rating) | result | Δrating |
| 1pioneer | 79 | Raxter, Timothy (1523) | Lost 0-2 | -191556 |
| 2pioneer | 282 | Wagenfuhr, Michael (1450) | Won 2-1 | +161572 |
| 3pioneer | 292 | Green, Edward (1394) | Lost 0-2 | -211551 |
| 4pioneer | 418 | Hisey, Matt (1482) | Won 2-0 | +171568 |
| 5pioneer | 313 | DeNatale, Nicholas (1530) | Won 2-0 | +171585 |
| 6pioneer | 169 | Dong, Peicong (1546) | Lost 0-2 | -191566 |
| top | average opponent: 1488record: 3-3 | new rating: 1566 | ||
| Grand Prix Los Angeles 2019 (modern) | starting rating: 1535 | |||
| round | table | opponent (rating) | result | Δrating |
| 1modern | 186 | Spencer, Matthew (1431) | Won 2-1 | +161551 |
| 2modern | 321 | Ancheta, Glory (1419) | Lost 0-2 | -211530 |
| 3modern | 468 | Velez Jo, Gil (1605) | Won 2-0 | +201550 |
| 4modern | 360 | Hibbard, Dalton (1725) | Won 2-1 | +211571 |
| 5modern | 111 | Garduno, Humberto (1534) | Won 2-0 | +171588 |
| 6modern | 88 | Marohl, Jake (1637) | Lost 0-2 | -171571 |
| 7modern | 227 | Hemphill, Jeff (1532) | Won 2-0 | +171588 |
| 8modern | 150 | Lundquist, Anthony (1852) | Lost 0-2 | -131575 |
| top | average opponent: 1592record: 5-3 | new rating: 1575 | ||
| Grand Prix Phoenix 2014 (BNG standard) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1standard | 274 | Gaines, Tyler Jo (1499) | Won 2-0 | +181518 |
| 2standard | 79 | Bailey, Scott (1535) | Won 2-1 | +181536 |
| 3standard | 155 | Morphis, James (1680) | Won 2-0 | +211557 |
| 4standard | 108 | Gall, Louis (1440) | Lost 0-2 | -201537 |
| 5standard | 154 | Diehl, Larry (1541) | Won 2-0 | +181555 |
| 6standard | 163 | Centofanti, David (1550) | Won 2-0 | +181573 |
| 7standard | 46 | Solis, Oscar (1449) | Lost 0-2 | -201553 |
| 8standard | 97 | Miller, Nicholas 401 (1556) | Lost 0-2 | -181535 |
| top | average opponent: 1531record: 5-3 | new rating: 1535 | ||