Postlewaite, John
Current rating: 1502
Record: 7-7
| Grand Prix Vancouver 2017 (modern) | starting rating: 1518 | |||
| round | table | opponent (rating) | result | Δrating |
| 1modern | 2377 | Spears-Turcotte, Brandon (1563) | Won 2-0 | +191537 |
| 2modern | 2257 | Roberts, Anthony (1529) | Lost 0-2 | -181519 |
| 3modern | 2346 | Koch, Alexander (1517) | Won 2-1 | +181537 |
| 4modern | 2436 | Thomsen, Peter (1516) | Lost 1-2 | -191518 |
| 5modern | 2337 | Flink, Chris (1681) | Lost 1-2 | -151503 |
| 6modern | 2522 | Brunnen, Kevin (1481) | Won 2-1 | +181521 |
| 7modern | 2360 | Monroe, Isaiah (1504) | Lost 1-2 | -191502 |
| average opponent: 1542record: 3-4 | new rating: 1502 | |||
| Grand Prix Portland 2010 (M11 limited) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 454 | Uy, Michael (1500) | Won 2-0 | +181518 |
| 2sealed | 92 | Johnson, Peter A (1500) | Won 2-0 | +181536 |
| 3sealed | 81 | Kiene, Thomas (1548) | Won 2-1 | +181554 |
| 4sealed | 27 | Wong, Brian_LR (1538) | Lost 1-2 | -181536 |
| 5sealed | 190 | Shenhar, Shahar (1505) | Lost 1-2 | -191517 |
| 6sealed | 280 | Steinfeld, Alexander (1488) | Won 2-0 | +181535 |
| 7sealed | 219 | Edelson, Steve (1614) | Lost 1-2 | -171518 |
| average opponent: 1528record: 4-3 | new rating: 1518 | |||