Grinnell, Matt G
Current rating: 1543
Record: 8-6
| Grand Prix Atlanta 2011 (extended) | starting rating: 1483 | |||
| round | table | opponent (rating) | result | Δrating |
| 1extended | 413 | Singh, William (1500) | Lost 1-2 | -181465 |
| 2extended | 562 | Hilderbrand, Travis (1482) | Won 2-1 | +181483 |
| 3extended | 532 | Rivers, Christopher (1501) | Won 2-0 | +191502 |
| 4extended | 555 | Buchheim, Hans (1534) | Lost 1-2 | -181484 |
| 5extended | 603 | Moore, Jarrett (1486) | Won 2-1 | +181502 |
| 6extended | 562 | Eads, William (1516) | Won 2-0 | +181520 |
| 7extended | 496 | Brazzell, Davis (1483) | Won 2-0 | +181538 |
| 8extended | 481 | Frazier, Matthew (1717) | Won 2-1 | +211559 |
| 9extended | 423 | Klauk, John (1645) | Lost 1-2 | -161543 |
| average opponent: 1540record: 6-3 | new rating: 1543 | |||
| Grand Prix Nashville 2010 (SOM limited) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 434 | Dyer, Brandon M (1500) | Won 2-1 | +181518 |
| 2sealed | 447 | Hollar, Paul (1601) | Lost 1-2 | -161502 |
| 3sealed | 589 | Mitchell, Max (1502) | Won 2-1 | +181520 |
| 4sealed | 507 | Bessler, BJ (1509) | Lost 0-2 | -191501 |
| 5sealed | 572 | Johnson, Case (1464) | Lost 0-2 | -181483 |
| average opponent: 1515record: 2-3 | new rating: 1483 | |||