Penfield, Matt
Current rating: 1500
Record: 7-8
| Grand Prix Portland 2017 (XLN standard) | starting rating: 1465 | |||
| round | table | opponent (rating) | result | Δrating |
| 1standard | 361 | Osborne-Koch, Matthew (1500) | Won 2-1 | +191484 |
| 2standard | 7 | Sletteland, Nate (1496) | Won 2-0 | +181502 |
| 3standard | 147 | Colker, Nathan (1874) | Lost 0-2 | -121490 |
| 4standard | 424 | Lee, Benjamin [CAN] (1518) | Lost 1-2 | -171473 |
| 5standard | 438 | Kiedrowski, Garrett (1489) | Won 2-1 | +181491 |
| 6standard | 214 | Kirshon, Daniel (1573) | Won 2-1 | +201511 |
| 7standard | 239 | Bieza, Scott (1645) | Won 2-1 | +201531 |
| 8standard | 125 | Nieves, Jose (1561) | Lost 1-2 | -171514 |
| 9standard | 279 | Botelho, Chris (1786) | Lost 1-2 | -141500 |
| average opponent: 1604record: 5-4 | new rating: 1500 | |||
| Grand Prix Portland 2016 (EMN standard) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1standard | 10 | Hancock, Connor (1500) | Lost 0-2 | -181482 |
| 2standard | 626 | Gunderson, Isaiah (1607) | Won 2-0 | +201502 |
| 3standard | 560 | Carroll, Patrick (1503) | Lost 0-2 | -181484 |
| 4standard | 663 | Edgar, Wesley (1481) | Lost 0-2 | -181466 |
| 5standard | 689 | Huckabee, Eli (1450) | Won 2-1 | +181484 |
| 6standard | 594 | Benson, Maxwell (1435) | Lost 0-2 | -191465 |
| average opponent: 1496record: 2-4 | new rating: 1465 | |||