Cowan, Dennis
Current rating: 1478
Record: 17-20
| Grand Prix Sacramento 2018 (M19 limited) | starting rating: 1468 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 30 | Tingey, George (1500) | Won 2-0 | +191487 |
| 2sealed | 54 | Carranza, Jaime (1652) | Won 2-0 | +211508 |
| 3sealed | 189 | Horspool, Tyler (1843) | Lost 1-2 | -121496 |
| 4sealed | 338 | Myong, David (1522) | Lost 0-2 | -181478 |
| top | average opponent: 1630record: 2-2 | new rating: 1478 | ||
| Grand Prix Las Vegas 2018 (limited) (DOM limited) | starting rating: 1431 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 1323 | Stephens, Arjan (1485) | Lost 1-2 | -171414 |
| 2sealed | 1352 | Hallock, Jason (1549) | Won 2-0 | +201434 |
| 3sealed | 1350 | Feria, Brian (1481) | Won 2-0 | +191453 |
| 4sealed | 1329 | Zyla, Sarah (1698) | Won 2-1 | +221475 |
| 5sealed | 1341 | Stephens, Lee (1533) | Won 2-0 | +191494 |
| 6sealed | 1316 | Hardwick, Richard (1722) | Lost 1-2 | -141480 |
| 7sealed | 1340 | Floyd, Aaron (1476) | Won 2-0 | +181498 |
| 8sealed | 1331 | Kanellis, David (1564) | Won 2-1 | +201518 |
| 9sealed | 1309 | Dixon, Harry (1612) | Lost 0-2 | -171501 |
| 10draft | 1405 | Beach, Paul (1539) | Lost 0-2 | -171484 |
| 11draft | 1404 | Bruner, Christopher (1605) | Lost 1-2 | -161468 |
| top | average opponent: 1569record: 6-5 | new rating: 1468 | ||
| Grand Prix Las Vegas 2017 (modern) (modern) | starting rating: 1448 | |||
| round | table | opponent (rating) | result | Δrating |
| 1modern | 591 | Guerrero, Michael (1500) | Lost 0-2 | -171431 |
| top | record: 0-1 | new rating: 1431 | ||
| Grand Prix Las Vegas 2017 (limited) (AKH limited) | starting rating: 1464 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 756 | Wilson, Robert (1491) | Lost 1-2 | -171447 |
| 2sealed | 788 | Gilmore, Alex (1469) | Won 2-1 | +181465 |
| 3sealed | 797 | Voye, Justin (1501) | Lost 0-2 | -171448 |
| top | average opponent: 1487record: 1-2 | new rating: 1448 | ||
| Grand Prix Las Vegas 2017 (legacy) (legacy) | starting rating: 1539 | |||
| round | table | opponent (rating) | result | Δrating |
| 1legacy | 85 | Huebner, Alex (1480) | Lost 1-2 | -191520 |
| 2legacy | 541 | Garcia Rivas, Miguel (1531) | Lost 0-2 | -181502 |
| 3legacy | 1102 | Fong, Christopher (1452) | Lost 1-2 | -191483 |
| 4legacy | 2191 | Lynch, Thomas (1448) | Lost 0-2 | -191464 |
| top | average opponent: 1478record: 0-4 | new rating: 1464 | ||
| Grand Prix Las Vegas 2015 (1) (MM2 limited) | starting rating: 1481 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 63 | Hasart, Jeremy (1500) | Won 2-1 | +191500 |
| 2sealed | 67 | Dondero, Nicholas (1491) | Lost 1-2 | -181482 |
| 3sealed | 184 | Duncan, Frederick (1570) | Lost 1-2 | -171465 |
| 4sealed | 260 | Whaley, Zoen (1485) | Won 2-0 | +191484 |
| 5sealed | 173 | Rincione, Joseph (1502) | Won 2-0 | +181502 |
| 6sealed | 168 | Godfrey, Victoria (1500) | Won 2-0 | +181520 |
| 7sealed | 106 | Nguyen, Tony (1535) | Won 2-0 | +181538 |
| 8sealed | 87 | Kong, Brian (1586) | Won 2-0 | +191557 |
| 9sealed | 58 | Barber, Matthew (1533) | Lost 1-2 | -181539 |
| top | average opponent: 1523record: 6-3 | new rating: 1539 | ||
| Grand Prix Phoenix 2014 (BNG standard) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1standard | 6 | Batinich, Andrew (1503) | Won 2-0 | +181518 |
| 2standard | 305 | Giffin, Conor (1534) | Lost 0-2 | -181500 |
| 3standard | 541 | Lindemann, Michael (1481) | Lost 1-2 | -181482 |
| 4standard | 500 | Maciel, Noe (1482) | Won 2-1 | +181500 |
| 5standard | 487 | Peters, Steven (1467) | Lost 0-2 | -191481 |
| top | average opponent: 1493record: 2-3 | new rating: 1481 | ||