Perkins, Joseph B
Current rating: 1456
Record: 4-7
| Grand Prix Austin 2012 (ISD limited) | starting rating: 1501 | |||
| round | table | opponent (rating) | result | Δrating |
| 4sealed | 130 | Rue, Charlie (1646) | Lost 0-2 | -151486 |
| 5sealed | 90 | Fulgium, James (1605) | Lost 0-2 | -161470 |
| 6sealed | 201 | Neuding, Aaron (1518) | Won 2-1 | +191489 |
| 7sealed | 197 | Charlesworth, Riley (1485) | Lost 1-2 | -181471 |
| 8sealed | 199 | Scott, Stephen (1665) | Lost 0-2 | -151456 |
| average opponent: 1584record: 1-4 | new rating: 1456 | |||
| Grand Prix Houston 2010 (extended) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 2extended | 128 | Zamora, Nathan (1542) | Lost 0-2 | -171483 |
| 3extended | 190 | Fernandes, Paulo (1483) | Lost 0-2 | -181465 |
| 4extended | 219 | Dixon, Shayne (1483) | Won 2-0 | +181483 |
| 5extended | 167 | Nguyen, Allen (1500) | Won 2-1 | +181501 |
| 6extended | 141 | Dykes, Tim (1516) | Won 2-1 | +191520 |
| 7extended | 95 | Brignon, Caleb R (1483) | Lost 0-2 | -191501 |
| average opponent: 1501record: 3-3 | new rating: 1501 | |||