Pierson, Justin M
Current rating: 1449
Record: 9-12-2
| Grand Prix Minneapolis 2009 (ZEN limited) | starting rating: 1462 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 246 | Baumgardt, Chad (1500) | Won 2-1 | +181480 |
| 2sealed | 18 | Bryant, Michael (1500) | Lost 0-2 | -171463 |
| 3sealed | 218 | Kohman, Josh (1500) | Lost 1-2 | -181445 |
| 4sealed | 388 | Majkrzak, Elan (1485) | Won 2-1 | +191464 |
| 5sealed | 317 | Becvar, Nick (1606) | Lost 0-2 | -151449 |
| top | average opponent: 1518record: 2-3 | new rating: 1449 | ||
| Grand Prix Chicago 2009 (legacy) | starting rating: 1499 | |||
| round | table | opponent (rating) | result | Δrating |
| 1legacy | 12 | Moravick, Michael T (1500) | Draw 1-1 | 01499 |
| 2legacy | 323 | Wilkening, Alex (1500) | Lost 1-2 | -181481 |
| 3legacy | 469 | Rodriguez, Andres (1396) | Draw 1-1 | -21479 |
| 4legacy | 540 | Christopher, Lou (1498) | Lost 0-2 | -171462 |
| top | average opponent: 1474record: 0-2-2 | new rating: 1462 | ||
| Grand Prix Indianapolis 2008 (SHM limited) | starting rating: 1518 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 240 | Wagnon, Benjamin (1500) | Won 2-0 | +171535 |
| 2sealed | 38 | Latif, Mehran (1493) | Lost 1-2 | -181517 |
| 3sealed | 377 | Port, Steve (1499) | Won 2-0 | +171534 |
| 4sealed | 204 | Glass, John (1564) | Lost 0-2 | -171517 |
| 5sealed | 289 | Heup, Michael (1502) | Lost 1-2 | -181499 |
| top | average opponent: 1512record: 2-3 | new rating: 1499 | ||
| Grand Prix Columbus 2007 (legacy) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1legacy | 289 | Cruz, Michael (1500) | Lost 1-2 | -181482 |
| 2legacy | 258 | Armbruster, Andrew (1482) | Lost 1-2 | -181464 |
| 3legacy | 344 | Taylor, Domynic (1463) | Lost 0-2 | -181446 |
| 4legacy | 405 | Fleischman, Richard (1448) | Won 2-0 | +181464 |
| 5legacy | 333 | Wallace, Zachary A (1464) | Won 2-0 | +181482 |
| 6legacy | 289 | Sato, Ryoichi (1481) | Won 2-0 | +181500 |
| 7legacy | 206 | Tsukuno, David (1499) | Won 2-0 | +181518 |
| 8legacy | 166 | younis, sam m (1503) | Won 2-1 | +181536 |
| 9legacy | 145 | Mauer, Joseph (1541) | Lost 1-2 | -181518 |
| top | average opponent: 1487record: 5-4 | new rating: 1518 | ||