Cook, Donald
Current rating: 1447
Record: 2-5
| Grand Prix Atlanta 2014 (JOU limited) | starting rating: 1482 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 273 | Wrigley, Abraham (1494) | Lost 0-2 | -181464 |
| 2sealed | 661 | Brackett, Brody (1483) | Won 2-1 | +191483 |
| 3sealed | 656 | Humphreys, Josh (1466) | Lost 0-2 | -191464 |
| 4sealed | 667 | Bobo, James (1483) | Lost 0-2 | -171447 |
| average opponent: 1481record: 1-3 | new rating: 1447 | |||
| Grand Prix Baltimore 2012 (DKA standard) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1standard | 5 | Noell, Jeremy (1500) | Lost 1-2 | -181482 |
| 2standard | 512 | Vasil, Jeremy (1482) | Won 2-1 | +181500 |
| 3standard | 353 | Lee, Matthew S. (1500) | Lost 1-2 | -181482 |
| average opponent: 1494record: 1-2 | new rating: 1482 | |||