Harbison, Peter J
Current rating: 1526
Record: 7-6
| Grand Prix Oakland 2010 (extended) | starting rating: 1483 | |||
| round | table | opponent (rating) | result | Δrating |
| 1extended | 6 | Hsu, Yohsiang (1500) | Won 2-0 | +181501 |
| 2extended | 175 | Goddard, Maxwell (1479) | Won 2-0 | +171518 |
| 3extended | 17 | Gonzalez, Miguel (1548) | Won 2-1 | +191537 |
| 4extended | 16 | Aimer, Dallas J (1589) | Won 2-0 | +191556 |
| 5extended | 12 | Parrish, Joby (1573) | Lost 0-2 | -181538 |
| 6extended | 37 | Gardiner, Grant (1559) | Won 2-0 | +191557 |
| 7extended | 48 | Juza, Martin (1975) | Lost 0-2 | -111546 |
| 8extended | 92 | Cook, Brennen (1452) | Lost 0-2 | -201526 |
| average opponent: 1584record: 5-3 | new rating: 1526 | |||
| Grand Prix Los Angeles 2009 (extended) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1extended | 233 | Salazar, JP (1500) | Lost 1-2 | -181482 |
| 2extended | 252 | Hecker, Caleb (1482) | Won 2-0 | +181500 |
| 3extended | 196 | Rodriguez, Xavier (1502) | Lost 1-2 | -181482 |
| 4extended | 337 | Hume, Aaron K (1481) | Won 2-0 | +181500 |
| 5extended | 244 | Toelken, Stewart (1527) | Lost 1-2 | -171483 |
| average opponent: 1499record: 2-3 | new rating: 1483 | |||