Mack, Stephan
Current rating: 1477
Record: 22-25-6
| Grand Prix Portland 2018 (modern) | starting rating: 1496 | |||
| round | table | opponent (rating) | result | Δrating |
| 2modern | 309 | Yandell, Josh (1520) | Lost 0-2 | -181478 |
| 3modern | 396 | Jensen, Dane (1446) | Won 2-1 | +171495 |
| 4modern | 300 | Crackenberg, Peter (1462) | Lost 0-2 | -181477 |
| 5modern | 578 | Cohen, Solomon (1430) | Lost 0-2 | -191458 |
| 6modern | 587 | Krantz, Benjamin (1398) | Lost 0-2 | -191439 |
| 7modern | 506 | Elliott, Cody (1489) | Won 2-0 | +191458 |
| 8modern | 383 | Edwards, Jordan (1502) | Won 2-1 | +191477 |
| top | average opponent: 1464record: 3-4 | new rating: 1477 | ||
| Grand Prix Pittsburgh 2018 (DOM standard) | starting rating: 1515 | |||
| round | table | opponent (rating) | result | Δrating |
| 3standard | 61 | Kotwica, Christy (1558) | Won 2-1 | +181533 |
| 4standard | 33 | Zhang, Bolun (2009) | Lost 1-2 | -91524 |
| 5standard | 137 | Sanders, Benjamin (1486) | Lost 0-2 | -191505 |
| 6standard | 170 | Kossowsky, Noah (1520) | Won 2-0 | +181523 |
| 7standard | 106 | Harmon, Lawrence (1679) | Lost 0-2 | -151508 |
| 8standard | 174 | Benson, Jonathan (1827) | Lost 1-2 | -121496 |
| top | average opponent: 1680record: 2-4 | new rating: 1496 | ||
| Grand Prix Seattle 2018 (standard) (RIX standard) | starting rating: 1486 | |||
| round | table | opponent (rating) | result | Δrating |
| 2standard | 17 | Glass, Campbell (1580) | Draw 1-1 | +21488 |
| 3standard | 333 | Schmitt, David (1541) | Won 2-1 | +191507 |
| 4standard | 179 | Geist, Blake (1557) | Lost 1-2 | -181489 |
| 5standard | 333 | Casorso, Joshua (1576) | Draw 1-1 | +21491 |
| 6standard | 3005 | Ballinger, Bradley (1520) | Won 2-0 | +191510 |
| 7standard | 373 | Lo, Jefferson (1774) | Draw 1-1 | +41514 |
| 8standard | 274 | Dossen, George (1535) | Draw 0-0 | +11515 |
| top | average opponent: 1583record: 2-1-4 | new rating: 1515 | ||
| Grand Prix Portland 2017 (XLN standard) | starting rating: 1459 | |||
| round | table | opponent (rating) | result | Δrating |
| 2standard | 261 | Saugier, Kyle (1609) | Won 2-1 | +201479 |
| 3standard | 226 | Edvalson, Eric (1603) | Won 2-1 | +211500 |
| 4standard | 140 | Brown, Patrick (1507) | Lost 0-2 | -181482 |
| 5standard | 258 | Warn, Zach (1534) | Lost 1-2 | -171465 |
| 6standard | 402 | Starke, Robert (1585) | Won 2-1 | +201485 |
| 7standard | 212 | Moore, Colby (1391) | Won 2-1 | +161501 |
| 8standard | 128 | Hadley, Justin (1554) | Draw 1-1 | +11502 |
| 9standard | 157 | Wong, Daniel (1595) | Lost 0-2 | -161486 |
| top | average opponent: 1547record: 4-3-1 | new rating: 1486 | ||
| Grand Prix Las Vegas 2017 (modern) (modern) | starting rating: 1516 | |||
| round | table | opponent (rating) | result | Δrating |
| 2modern | 2113 | Tews, Andrew (1571) | Draw 1-1 | +11517 |
| 3modern | 787 | Moren, Kairo (1516) | Lost 0-2 | -181499 |
| 4modern | 1050 | Gentner, Joe (1464) | Lost 0-2 | -191480 |
| 5modern | 1204 | Carson, Meranda (1332) | Lost 1-2 | -211459 |
| 6modern | 1213 | Williams, Greg (1520) | Lost 0-2 | -171442 |
| 7modern | 1105 | Finch, Daniel (1382) | Won 2-1 | +171459 |
| 8modern | 903 | Vidana, Juan Carlos (1464) | Lost 1-2 | -181441 |
| 9modern | 774 | Beardsley, Sean (1402) | Won 2-0 | +181459 |
| top | average opponent: 1457record: 2-5-1 | new rating: 1459 | ||
| Grand Prix Las Vegas 2017 (limited) (AKH limited) | starting rating: 1517 | |||
| round | table | opponent (rating) | result | Δrating |
| 2sealed | 361 | McKnight, Kasie (1327) | Won 2-0 | +141531 |
| 3sealed | 2102 | Pierce, Lucius (1420) | Won 2-1 | +161547 |
| 4sealed | 33 | Brunton, David (1550) | Lost 0-2 | -181529 |
| 5sealed | 508 | Wiesenberg, Joseph (1664) | Lost 1-2 | -151514 |
| 6sealed | 440 | Iiams, Brandon (1527) | Won 2-1 | +181532 |
| 7sealed | 280 | Beldon, Omar (1727) | Won 2-0 | +211553 |
| 8sealed | 262 | Perrenod, George (1551) | Lost 1-2 | -181535 |
| 9sealed | 435 | Lind, Josh (1438) | Lost 1-2 | -191516 |
| top | average opponent: 1525record: 4-4 | new rating: 1516 | ||
| Grand Prix Vancouver 2017 (modern) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1modern | 2096 | Finazzi, Luca (1497) | Lost 0-2 | -181482 |
| 2modern | 2417 | Curtright, Kevin (1482) | Won 2-1 | +181500 |
| 3modern | 2546 | Gribov, Omry (1577) | Lost 0-2 | -171483 |
| 4modern | 2585 | Markieta, Konrad (1477) | Lost 1-2 | -181465 |
| 5modern | 2673 | Asman, Steven (1464) | Lost 0-2 | -181447 |
| 6modern | 2640 | Moore, Colby (1372) | Won 2-0 | +171464 |
| 7modern | 2511 | Martin, Chris [CAN] (1398) | Won 2-0 | +171481 |
| 8modern | 2409 | Andres, Nick (1480) | Won 2-1 | +181499 |
| 9modern | 2322 | Ochoa, Jasmin (1501) | Won 2-1 | +181517 |
| top | average opponent: 1472record: 5-4 | new rating: 1517 | ||