Jack, John
Current rating: 1481
Record: 1-2-2
| Grand Prix Vancouver 2008 (extended) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1extended | 44 | Johnson, Derek B (1500) | Lost 0-2 | -181482 |
| 2extended | 102 | Trudeau, Travis (1481) | Draw 1-1 | 01482 |
| 3extended | 142 | Lee, James A (1481) | Draw 1-1 | 01482 |
| 4extended | 180 | Davis, Joseph D (1464) | Won 2-1 | +181500 |
| 5extended | 147 | Goff, Robert (1463) | Lost 0-2 | -191481 |
| average opponent: 1478record: 1-2-2 | new rating: 1481 | |||