Kosman, David
Current rating: 1496
Record: 5-6-1
| Grand Prix Cleveland 2015 (FRF limited) | starting rating: 1463 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 388 | Lurie, Ian (1500) | Won 2-0 | +181481 |
| 2sealed | 122 | Struble, Stephanie (1518) | Draw 1-1 | +11482 |
| 3sealed | 386 | Boone, David (1518) | Won 2-0 | +191501 |
| 4sealed | 216 | Cuvelier, John (1943) | Lost 1-2 | -111490 |
| 5sealed | 404 | Hess, William (1522) | Won 2-1 | +191509 |
| 6sealed | 248 | Betesh, Ralph (1778) | Lost 0-2 | -131496 |
| average opponent: 1630record: 3-2-1 | new rating: 1496 | |||
| Grand Prix Columbus 2012 (modern) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1modern | 119 | Campbell, Jesse (1506) | Lost 1-2 | -181482 |
| 2modern | 323 | Toskin, Mattie (1482) | Won 2-1 | +181500 |
| 3modern | 266 | ANDORFER, GAGE (1500) | Lost 1-2 | -181482 |
| 4modern | 453 | Alden, Matt (1411) | Won 2-0 | +171499 |
| 5modern | 367 | Taimla, Christopher (1553) | Lost 0-2 | -171482 |
| 6modern | 385 | Kazhdan, Ben (1421) | Lost 0-2 | -191463 |
| average opponent: 1479record: 2-4 | new rating: 1463 | |||