Stephenson, William
Current rating: 1561
Record: 24-24
| Grand Prix Atlanta 2017 (XLN standard) | starting rating: 1430 | |||
| round | table | opponent (rating) | result | Δrating |
| 1standard | 388 | Lea, Joshua (1485) | Won 2-1 | +191449 |
| 2standard | 314 | Panhorst, Trevor (1518) | Won 2-1 | +191468 |
| 3standard | 144 | Synan, David (1568) | Won 2-0 | +201488 |
| 4standard | 130 | Nguyen, Tuan (1891) | Lost 1-2 | -111477 |
| 5standard | 195 | McKenzie, E (1742) | Won 2-0 | +231500 |
| 6standard | 70 | Lopez, Andrew (1435) | Won 2-0 | +171517 |
| 7standard | 108 | Carter, Jonathan (1544) | Won 2-1 | +181535 |
| 8standard | 17 | Kalbus, Wes (1889) | Lost 1-2 | -121523 |
| 9standard | 127 | Egan, Kevin (1713) | Lost 0-2 | -141509 |
| 10standard | 113 | Strodl, Courtland (1630) | Lost 1-2 | -161493 |
| 11standard | 176 | Whiteside, Edward (1642) | Won 2-1 | +211514 |
| 12standard | 122 | Schneider, Travis (1739) | Lost 1-2 | -141500 |
| 13standard | 141 | Moore, Chris (1537) | Won 2-0 | +181518 |
| 14standard | 126 | Andress, Nathan (1755) | Won 2-1 | +231541 |
| 15standard | 86 | McIsaac, Neil (1643) | Won 2-1 | +201561 |
| top | average opponent: 1649record: 10-5 | new rating: 1561 | ||
| Grand Prix Los Angeles 2014 (KTK standard) | starting rating: 1465 | |||
| round | table | opponent (rating) | result | Δrating |
| 1standard | 4 | Dyer, Spencer (1500) | Won 2-1 | +191484 |
| 2standard | 27 | Besterman, Daniel (1521) | Lost 0-2 | -181466 |
| 3standard | 621 | Lao, Jeddy (1451) | Lost 0-2 | -181448 |
| 4standard | 720 | Crowley, Benjamin (1453) | Lost 1-2 | -181430 |
| top | average opponent: 1481record: 1-3 | new rating: 1430 | ||
| Grand Prix Austin 2012 (ISD limited) | starting rating: 1496 | |||
| round | table | opponent (rating) | result | Δrating |
| 2sealed | 188 | Soules, Brian (1500) | Won 2-1 | +181514 |
| 3sealed | 20 | Cifka, Stanislav (1694) | Lost 0-2 | -151499 |
| 4sealed | 303 | Chen, Michael (1496) | Won 2-0 | +181517 |
| 5sealed | 105 | Sutcliffe, Marshall (1546) | Lost 1-2 | -181499 |
| 6sealed | 226 | Wredberg, Patrick (1526) | Lost 0-2 | -171482 |
| 7sealed | 256 | Brunson, Damyan (1522) | Lost 1-2 | -171465 |
| 8sealed | 225 | Laymon, Damon (1465) | Won 2-1 | +181483 |
| 9sealed | 177 | Jones, Mark (1499) | Lost 1-2 | -181465 |
| top | average opponent: 1531record: 3-5 | new rating: 1465 | ||
| Grand Prix Kansas City 2011 (NPH limited) | starting rating: 1473 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 1 | Segarra, Andre (1542) | Lost 1-2 | -171456 |
| 2sealed | 284 | Anderson, Ace (1483) | Won 2-0 | +191475 |
| 3sealed | 198 | Glanz, Kris I (1521) | Lost 1-2 | -171458 |
| 4sealed | 347 | Zebas, Alex S (1482) | Won 2-1 | +181476 |
| 5sealed | 274 | Klopchic, Joseph (1500) | Lost 1-2 | -171459 |
| 6sealed | 279 | Eames, Elizabeth (1481) | Won 2-0 | +181477 |
| 7sealed | 212 | Werner, Tyler (1502) | Won 2-0 | +181495 |
| 8sealed | 155 | Buehler, Alexander (1474) | Lost 1-2 | -181477 |
| 9sealed | 154 | Engelhardt, Chris (1507) | Won 2-1 | +191496 |
| top | average opponent: 1499record: 5-4 | new rating: 1496 | ||
| Grand Prix Dallas-Fort Worth 2011 (MBS standard) | starting rating: 1446 | |||
| round | table | opponent (rating) | result | Δrating |
| 1standard | 146 | Baldridge, Corey (1551) | Lost 1-2 | -161430 |
| 2standard | 355 | Dusang, Daniel (1482) | Lost 0-2 | -171413 |
| 3standard | 456 | Hawkins, Rachel (1464) | Lost 0-2 | -171396 |
| 4standard | 537 | DuMais, Dillon (1446) | Won 2-1 | +191415 |
| 5standard | 484 | Leinbach, Trevor E (1462) | Won 2-0 | +191434 |
| 6standard | 366 | Korcal, Sean M (1484) | Won 2-0 | +191453 |
| 7standard | 268 | Sewell, Matthew (1500) | Won 2-0 | +181471 |
| 8standard | 193 | Vex K., (1516) | Lost 1-2 | -171454 |
| 9standard | 159 | Tuttle, Brad (1500) | Won 2-0 | +191473 |
| top | average opponent: 1489record: 5-4 | new rating: 1473 | ||
| Grand Prix Nashville 2010 (SOM limited) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 44 | Flickinger, Eric (1500) | Lost 1-2 | -181482 |
| 2sealed | 266 | Sloop, Jeffery (1482) | Lost 0-2 | -181464 |
| 3sealed | 296 | Fleming, Nathan (1472) | Lost 0-2 | -181446 |
| top | average opponent: 1485record: 0-3 | new rating: 1446 | ||