Duffey, Lucas
Current rating: 1463
Record: 10-13
| Grand Prix Denver 2019 (M20 standard) | starting rating: 1476 | |||
| round | table | opponent (rating) | result | Δrating |
| 1standard | 15 | Mercier, Matthew (1524) | Won 2-0 | +191495 |
| 2standard | 121 | Fernandez, Camilo (1774) | Lost 1-2 | -131482 |
| 3standard | 250 | Samuels, Bradley (1511) | Won 2-1 | +191501 |
| 4standard | 126 | Blake, Paul (1550) | Lost 1-2 | -171484 |
| 5standard | 214 | Jahnke, Kaitlyn (1349) | Lost 1-2 | -211463 |
| top | average opponent: 1542record: 2-3 | new rating: 1463 | ||
| Grand Prix Los Angeles 2019 (modern) | starting rating: 1463 | |||
| round | table | opponent (rating) | result | Δrating |
| 1modern | 228 | Bell, Ryan 662 (1500) | Lost 0-2 | -171446 |
| 2modern | 530 | Bertrand, Colby (1482) | Won 2-0 | +191465 |
| 3modern | 544 | Gonzalez, Giovanny (1638) | Won 2-1 | +211486 |
| 4modern | 275 | Moran, James (1497) | Lost 0-2 | -181468 |
| 5modern | 557 | Thompson, Geoffrey (1558) | Won 2-1 | +201488 |
| 6modern | 449 | Keeth, Christian (1873) | Lost 0-2 | -121476 |
| top | average opponent: 1591record: 3-3 | new rating: 1476 | ||
| Grand Prix Los Angeles 2018 (M19 standard) | starting rating: 1482 | |||
| round | table | opponent (rating) | result | Δrating |
| 1standard | 298 | Taylor, Kyle 9645 (1536) | Won 2-1 | +191501 |
| 2standard | 156 | Jameson, Aeden (1422) | Lost 1-2 | -201481 |
| 3standard | 402 | Clay, Chris (1581) | Lost 1-2 | -161465 |
| 4standard | 451 | Ramsey, Trevor (1480) | Lost 0-2 | -171448 |
| 5standard | 144 | Garcia, Andrea (1327) | Won 2-0 | +151463 |
| top | average opponent: 1469record: 2-3 | new rating: 1463 | ||
| Grand Prix Portland 2016 (EMN standard) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1standard | 284 | Foglesong, Nicklaus (1500) | Lost 0-2 | -181482 |
| 2standard | 517 | Mosby, Jacob (1482) | Lost 1-2 | -181464 |
| 3standard | 767 | Prewitt, Nicholas (1463) | Won 2-1 | +181482 |
| 4standard | 734 | Bradley, Kaitlin (1480) | Won 2-1 | +181500 |
| 5standard | 442 | Dickinson, Jack (1502) | Lost 0-2 | -181482 |
| 6standard | 619 | Aoki, Masashi (1480) | Lost 0-2 | -181464 |
| 7standard | 573 | Markham, Beck (1463) | Won 2-0 | +181482 |
| top | average opponent: 1481record: 3-4 | new rating: 1482 | ||