Prohaska, Orren
Current rating: 1560
Record: 15-13
| Grand Prix Oklahoma City 2017 (modern) | starting rating: 1505 | |||
| round | table | opponent (rating) | result | Δrating |
| 1modern | 438 | Oliver, Kristin (1500) | Lost 0-2 | -181487 |
| 2modern | 390 | Payne, Chris (1482) | Won 2-1 | +181505 |
| 3modern | 328 | Stevenson, James (1700) | Won 2-1 | +221527 |
| 4modern | 335 | Kemper, Jayson (1469) | Lost 1-2 | -191508 |
| 5modern | 393 | Womack, Gabriel (1666) | Won 2-1 | +211529 |
| 6modern | 211 | Goulart, Andrew (1484) | Won 2-1 | +171546 |
| 7modern | 157 | Rhodman, Steven (1672) | Won 2-1 | +201566 |
| 8modern | 138 | Derrickson, Jefferson (1561) | Won 2-1 | +181584 |
| 9modern | 57 | Hu, Haibing (1909) | Won 2-1 | +241608 |
| 10modern | 63 | Clark, Jeremiah (1708) | Won 2-0 | +191627 |
| 11modern | 20 | Self, James (1626) | Lost 1-2 | -181609 |
| 12modern | 84 | Schroeder, Tyler (1779) | Lost 0-2 | -141595 |
| 13modern | 84 | Lynn, Brian (1645) | Lost 1-2 | -181577 |
| 14modern | 99 | Edelson, Adam (1610) | Lost 1-2 | -171560 |
| top | average opponent: 1629record: 8-6 | new rating: 1560 | ||
| Grand Prix Dallas-Fort Worth 2016 (modern) | starting rating: 1481 | |||
| round | table | opponent (rating) | result | Δrating |
| 1modern | 88 | Bailey, Ranon (1500) | Won 2-0 | +181499 |
| 2modern | 46 | Sneed, Jacob (1518) | Lost 0-2 | -181481 |
| 3modern | 464 | Tuttle, Dennis (1498) | Won 2-0 | +191500 |
| 4modern | 512 | Walker, Chase (1505) | Lost 1-2 | -181482 |
| 5modern | 602 | Barber, Kashaun (1505) | Lost 1-2 | -181464 |
| 6modern | 646 | Anderson, Jack (1536) | Won 2-0 | +201484 |
| 7modern | 613 | McLendon, John (1504) | Won 2-0 | +181502 |
| 8modern | 464 | Elsik, Zac (1786) | Lost 1-2 | -131489 |
| 9modern | 443 | Van Zee, Will (1401) | Won 2-1 | +161505 |
| top | average opponent: 1528record: 5-4 | new rating: 1505 | ||
| Grand Prix Kansas City 2011 (NPH limited) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 124 | Thomas, Danielle (1500) | Won 2-0 | +181518 |
| 2sealed | 56 | Crouch, Nathan J (1540) | Lost 1-2 | -181500 |
| 3sealed | 248 | Praxl, Andrew J (1497) | Won 2-0 | +181518 |
| 4sealed | 184 | Janssen, Phillip J (1482) | Lost 0-2 | -181500 |
| 5sealed | 233 | Nelms, Andrew (1450) | Lost 1-2 | -191481 |
| top | average opponent: 1494record: 2-3 | new rating: 1481 | ||