Campbell, John
Current rating: 1467
| Grand Prix Charlotte 2015 (modern) | starting rating: 1483 | |||
| round | table | opponent (rating) | result | Δrating |
| 1modern | 865 | Farmer, Jason T (1500) | Lost 0-2 | -181465 |
| 2modern | 1093 | Ashworth, Michael (1538) | Lost 0-2 | -161449 |
| 3modern | 1131 | Gilford, Johnathan (1464) | Won 2-0 | +181467 |
| top | average opponent: 1501record: 1-2 | new rating: 1467 | ||
| Grand Prix Calgary 2013 (M14 standard) | starting rating: 1464 | |||
| round | table | opponent (rating) | result | Δrating |
| 1standard | 146 | Carnahan, Megan (1500) | Won 0-0 | +191483 |
| 2standard | 167 | Henderson, Reagan (1518) | Lost 1-2 | -181465 |
| 3standard | 268 | Webster, Sean (1481) | Won 2-0 | +191484 |
| 4standard | 215 | Kraft, Aaryn (1482) | Won 2-0 | +181502 |
| 5standard | 156 | Mitchell, Kurt (1464) | Lost 0-2 | -191483 |
| top | average opponent: 1489record: 3-2 | new rating: 1483 | ||
| Grand Prix Charlotte 2005 (extended) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1extended | 26 | Oliveros, Alex (1500) | Lost 0-2 | -181482 |
| 2extended | 180 | Schneck, Joshua (1505) | Won 2-0 | +181500 |
| 3extended | 153 | Coale, Hunter (1500) | Lost 1-2 | -181482 |
| 4extended | 192 | Ward, Jonathan B (1466) | Lost 0-2 | -181464 |
| top | average opponent: 1493record: 1-3 | new rating: 1464 | ||