Koprek, Justin
Current rating: 1497
Record: 4-4
| Grand Prix Portland 2010 (M11 limited) | starting rating: 1516 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 251 | Shoemaker, Kevin (1500) | Won 2-1 | +181534 |
| 2sealed | 269 | Elvigan, Jeff (1518) | Lost 1-2 | -181516 |
| 3sealed | 417 | Stivers, Nathanael J (1503) | Lost 0-2 | -191497 |
| average opponent: 1507record: 1-2 | new rating: 1497 | |||
| Grand Prix Seattle 2005 (extended) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1extended | 53 | Scheffler, Jonan (1500) | Won 2-0 | +181518 |
| 2extended | 35 | Heinonen, Chris (1500) | Won 2-0 | +181536 |
| 3extended | 33 | Laughlin, Steve (1536) | Lost 0-2 | -181518 |
| 4extended | 111 | Atkinson, Dallin (1518) | Won 2-0 | +181536 |
| 5extended | 34 | Meyer, Chad (1448) | Lost 0-2 | -201516 |
| average opponent: 1500record: 3-2 | new rating: 1516 | |||