Folk, Coby
Current rating: 1515
| Grand Prix Portland 2019 (ELD standard) | starting rating: 1514 | |||
| round | table | opponent (rating) | result | Δrating |
| 1standard | 22 | Sweeney, Mark (1401) | Lost 0-2 | -201494 |
| 2standard | 136 | Mckee, Michael (1481) | Won 2-0 | +181512 |
| 3standard | 200 | Anderson, Thomas [USA] (1481) | Won 0-0 | +171529 |
| 4standard | 141 | [anonymous] | Lost 0-2 | -141515 |
| top | average opponent: 1523record: 2-2 | new rating: 1515 | ||
| Grand Prix Portland 2018 (modern) | starting rating: 1497 | |||
| round | table | opponent (rating) | result | Δrating |
| 1modern | 437 | Horton, Matthew (1521) | Lost 1-2 | -181479 |
| 2modern | 448 | Eastburn, Stephen (1445) | Won 2-0 | +181497 |
| 3modern | 383 | Taut, Emanuel (1497) | Lost 1-2 | -181479 |
| 4modern | 637 | Vela, Jacob (1483) | Won 2-0 | +181497 |
| 5modern | 464 | King, Travis (1431) | Won 2-0 | +171514 |
| 6modern | 394 | Hawkins, Donald (1516) | Won 2-0 | +181532 |
| 7modern | 284 | Sharp, Noah (1551) | Lost 0-2 | -181514 |
| top | average opponent: 1492record: 4-3 | new rating: 1514 | ||
| Grand Prix Portland 2017 (XLN standard) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1standard | 495 | Cabasa, Rheney (1500) | Won 2-1 | +181518 |
| 2standard | 355 | Shock, Taylor (1518) | Lost 0-2 | -181500 |
| 3standard | 373 | Simonson, Erik (1473) | Won 2-0 | +181518 |
| 4standard | 176 | Tellez, Manuel (1339) | Lost 0-2 | -221496 |
| 5standard | 398 | Danke, Harrison (1502) | Won 2-0 | +181514 |
| 6standard | 369 | Cisneros, Sergio (1515) | Won 2-1 | +181532 |
| 7standard | 179 | Stroud, Ryan (1526) | Lost 0-2 | -181514 |
| 8standard | 314 | Leach, William (1549) | Lost 1-2 | -171497 |
| top | average opponent: 1490record: 4-4 | new rating: 1497 | ||