Portizo, Jason
Current rating: 1501
Record: 6-6
| Grand Prix Philadelphia 2008 (extended) | starting rating: 1482 | |||
| round | table | opponent (rating) | result | Δrating |
| 1extended | 195 | Wilson, Anthony (1420) | Lost 0-2 | -191463 |
| 2extended | 298 | Nordstrom, Erik (1483) | Won 2-0 | +181481 |
| 3extended | 256 | Sears, Van (1499) | Lost 1-2 | -171464 |
| 4extended | 338 | Rossiter, Matt R (1487) | Won 2-1 | +181482 |
| 5extended | 228 | Baldasari, Antonino (1500) | Won 2-0 | +181500 |
| 6extended | 195 | Chupashko, Jake (1518) | Won 2-0 | +191519 |
| 7extended | 168 | Ladouceur, Travis (1522) | Lost 1-2 | -181501 |
| average opponent: 1490record: 4-3 | new rating: 1501 | |||
| Grand Prix Boston 2005 (extended) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1extended | 171 | Seidman, Max (1500) | Lost 1-2 | -181482 |
| 2extended | 228 | Merola, Vincent (1482) | Won 2-0 | +181500 |
| 3extended | 177 | Probasco, Andrew (1500) | Lost 1-2 | -181482 |
| 4extended | 245 | Baum, Noah (1481) | Won 2-0 | +181500 |
| 5extended | 229 | Feehan, Matt (1501) | Lost 0-2 | -181482 |
| average opponent: 1493record: 2-3 | new rating: 1482 | |||