Gerrish, Colby
Current rating: 1606
Record: 19-16
| Grand Prix Atlanta 2011 (extended) | starting rating: 1467 | |||
| round | table | opponent (rating) | result | Δrating |
| 2extended | 412 | Reger, Bobby (1449) | Won 2-0 | +181485 |
| 3extended | 440 | Mack, Shaun (1537) | Lost 0-2 | -171468 |
| 4extended | 500 | Wilder, Corey (1518) | Won 2-0 | +181486 |
| 5extended | 536 | Krug, Andrew (1582) | Won 2-1 | +201506 |
| 6extended | 446 | Nguyen, Justin (1504) | Won 2-1 | +181524 |
| 7extended | 420 | McGrew, Brian (1609) | Won 2-0 | +201544 |
| 8extended | 414 | Blough, Alex (1645) | Won 2-0 | +201564 |
| 9extended | 408 | Shoaf, Nicholas (1573) | Won 2-0 | +181582 |
| 10extended | 10 | Beasley, Orrin (1777) | Won 2-1 | +211603 |
| 11extended | 11 | Thomas, David S (1831) | Won 2-0 | +221625 |
| 12extended | 7 | Hunt, Matthias (1713) | Won 2-1 | +201645 |
| 13extended | 1 | Turtenwald, Owen (2077) | Lost 0-2 | -111634 |
| 14extended | 10 | Stark, Ben S (2029) | Lost 1-2 | -111623 |
| 15extended | 20 | Mansoor, Mat M (1672) | Lost 0-2 | -171606 |
| top | average opponent: 1680record: 10-4 | new rating: 1606 | ||
| Grand Prix Nashville 2010 (SOM limited) | starting rating: 1458 | |||
| round | table | opponent (rating) | result | Δrating |
| 2sealed | 2 | Erwin, Evan (1610) | Won 2-0 | +211479 |
| 3sealed | 110 | Hall, Travis S (1577) | Lost 1-2 | -161463 |
| 4sealed | 196 | Adams, Dustin (1517) | Won 2-0 | +191482 |
| 5sealed | 156 | Jordan, Michael (1459) | Won 2-1 | +181500 |
| 6sealed | 32 | Powell, Antonio (1628) | Lost 0-2 | -161484 |
| 7sealed | 80 | Whitmore, Travis J (1541) | Lost 0-2 | -171467 |
| top | average opponent: 1555record: 3-3 | new rating: 1467 | ||
| Grand Prix Atlanta 2008 (ALA limited) | starting rating: 1475 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 188 | Pyrlik, Kali N (1500) | Won 2-1 | +191494 |
| 2sealed | 51 | Long, Matthew C (1498) | Lost 1-2 | -181476 |
| 3sealed | 251 | Tiszai, Jeremy (1500) | Lost 1-2 | -181458 |
| top | average opponent: 1499record: 1-2 | new rating: 1458 | ||
| Grand Prix Daytona Beach 2007 (LRW limited) | starting rating: 1447 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 3 | Bakula Sr., Thomas (1446) | Won 2-0 | +181465 |
| 2sealed | 94 | Matecki, Justin (1500) | Lost 1-2 | -181447 |
| 3sealed | 203 | Campbell, Gregg (1500) | Won 2-0 | +191466 |
| 4sealed | 109 | Carroll, William (1517) | Won 2-1 | +191485 |
| 5sealed | 72 | Stead, Bob (1645) | Lost 0-2 | -151470 |
| 6sealed | 111 | Byers, Joshua W (1483) | Won 2-0 | +181488 |
| 7sealed | 73 | Stein, Sam (1771) | Lost 1-2 | -131475 |
| top | average opponent: 1552record: 4-3 | new rating: 1475 | ||
| Grand Prix Atlanta 2003 (8ED standard) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1standard | 177 | Blackstock, Lauren (1500) | Won 1-0 | +181518 |
| 2standard | 24 | Wee, Olwen (1610) | Lost 0-2 | -161502 |
| 3standard | 150 | Carey, Joey (1459) | Lost 0-2 | -191483 |
| 4standard | 227 | Moore, Bo (1482) | Lost 0-2 | -181465 |
| 5standard | 206 | Salter, Sean (1463) | Lost 0-2 | -181447 |
| top | average opponent: 1503record: 1-4 | new rating: 1447 | ||