Kostas, Steven
Current rating: 1588
Record: 64-53-5
Grand Prix Quebec City 2013Grand Prix Miami 2013Grand Prix Toronto 2013Grand Prix Richmond 2014Grand Prix Boston-Worcester 2014Grand Prix Orlando 2014Grand Prix New Jersey 2014Grand Prix Ottawa 2014Grand Prix Montreal 2015Grand Prix Seattle-Tacoma 2015Grand Prix Los Angeles 2016Grand Prix Toronto 2018Grand Prix Niagara Falls 2019Grand Prix Detroit 2019Grand Prix Montreal 2019
| Grand Prix Montreal 2019 (ELD limited) | starting rating: 1623 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 366 | Gagnon-danker, Adrian (1500) | Won 2-0 | +161639 |
| 2sealed | 181 | Jackson, Daniel (1390) | Draw 1-1 | -51634 |
| 3sealed | 177 | Morrill, Adam (1345) | Won 2-1 | +131647 |
| 4sealed | 89 | Duclos, Patrice (1535) | Won 2-0 | +161663 |
| 5sealed | 42 | Della Grotte, Kevin (1613) | Lost 0-2 | -191644 |
| 6sealed | 105 | Liu, Geoffrey (1542) | Lost 0-2 | -201624 |
| 7sealed | 165 | Gatien, Xavier (1515) | Lost 0-2 | -201604 |
| 8sealed | 142 | Leduc Gauthier, Samuel (1664) | Lost 0-2 | -161588 |
| top | average opponent: 1513record: 3-4-1 | new rating: 1588 | ||
| Grand Prix Detroit 2019 (M20 limited) | starting rating: 1602 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 162 | Corte, Donald (1507) | Won 2-0 | +161618 |
| 2sealed | 50 | Westermann, W. Scott (1519) | Lost 1-2 | -201598 |
| 3sealed | 209 | Kolbuc, Trevor (1403) | Won 2-1 | +151613 |
| 4sealed | 102 | Busch, Joshua (1491) | Won 2-0 | +161629 |
| 5sealed | 127 | Evans, Chris (1520) | Won 2-0 | +161645 |
| 6sealed | 56 | Kuchar, Craig (1675) | Lost 0-2 | -181627 |
| 7sealed | 83 | Hicks, Matt (1506) | Lost 1-2 | -201607 |
| 8sealed | 107 | Minchella, Anthony (1498) | Won 2-1 | +161623 |
| top | average opponent: 1515record: 5-3 | new rating: 1623 | ||
| Grand Prix Niagara Falls 2019 (legacy) | starting rating: 1608 | |||
| round | table | opponent (rating) | result | Δrating |
| 1legacy | 40 | Scott, Jody (1543) | Won 2-0 | +171625 |
| 2legacy | 135 | Carino, Joseph (1591) | Lost 0-2 | -181607 |
| 3legacy | 282 | Berlinrut, Gregory (1593) | Won 2-1 | +171624 |
| 4legacy | 129 | Lloyd, Kyle (1460) | Lost 0-2 | -211603 |
| 5legacy | 249 | Fishbein, Eli (1534) | Lost 0-2 | -191584 |
| 6legacy | 308 | Blackstock, Ryan (1487) | Won 2-0 | +161600 |
| 7legacy | 271 | Gallagher, Grant (1501) | Won 2-0 | +171617 |
| 8legacy | 163 | Bianchi, Alex (1808) | Lost 1-2 | -151602 |
| top | average opponent: 1565record: 4-4 | new rating: 1602 | ||
| Grand Prix Toronto 2018 (modern) | starting rating: 1586 | |||
| round | table | opponent (rating) | result | Δrating |
| 1modern | 369 | Young, Bryant (1482) | Won 2-0 | +161602 |
| 2modern | 339 | Leonard, Braden (1518) | Lost 1-2 | -191583 |
| 3modern | 446 | Bourdon, Marc-Olivier (1500) | Lost 1-2 | -201563 |
| 4modern | 641 | Elisseeff, Xavier (1487) | Won 2-0 | +171580 |
| 5modern | 435 | Burr, Joshua (1505) | Lost 0-2 | -201560 |
| 6modern | 585 | Truong, Vic (1484) | Won 2-1 | +171577 |
| 7modern | 429 | Duncan, Braiden (1501) | Won 2-0 | +171594 |
| 8modern | 264 | Eichelberger, Gregory (1416) | Won 2-1 | +141608 |
| top | average opponent: 1487record: 5-3 | new rating: 1608 | ||
| Grand Prix Los Angeles 2016 (modern) | starting rating: 1615 | |||
| round | table | opponent (rating) | result | Δrating |
| 2modern | 1 | Thomas, Kenneth (1569) | Lost 0-2 | -191596 |
| 3modern | 514 | Astorga, Efrain (1507) | Won 2-0 | +171613 |
| 4modern | 317 | Do, Mimi (1519) | Lost 1-2 | -201593 |
| 5modern | 722 | Leigh, Alina (1403) | Lost 0-2 | -211572 |
| 6modern | 690 | Jewett, Dylan (1481) | Lost 1-2 | -201552 |
| 7modern | 793 | Ashby, Raymond (1579) | Won 2-0 | +181570 |
| 8modern | 638 | Johnson, Dylan (1444) | Won 2-0 | +161586 |
| top | average opponent: 1500record: 3-4 | new rating: 1586 | ||
| Grand Prix Seattle-Tacoma 2015 (legacy) | starting rating: 1670 | |||
| round | table | opponent (rating) | result | Δrating |
| 2legacy | 107 | Marshall, Jacob (1583) | Lost 1-2 | -191651 |
| 3legacy | 557 | Navrkal, Damon (1469) | Won 2-1 | +141665 |
| 4legacy | 509 | Bailey, Tyler (1506) | Lost 1-2 | -201645 |
| 5legacy | 599 | Nguyen, Michael (1573) | Won 2-1 | +161661 |
| 6legacy | 377 | Fremin, Steven (1483) | Lost 0-2 | -211640 |
| 7legacy | 475 | Munson, Stacy (1517) | Won 2-0 | +161656 |
| 8legacy | 331 | Klein, Patrick (1523) | Lost 1-2 | -211635 |
| 9legacy | 287 | Kent, Doug (1509) | Lost 0-2 | -201615 |
| top | average opponent: 1520record: 3-5 | new rating: 1615 | ||
| Grand Prix Montreal 2015 (DTK limited) | starting rating: 1610 | |||
| round | table | opponent (rating) | result | Δrating |
| 2sealed | 246 | Casorso, Joseph (1621) | Won 2-1 | +181628 |
| 3sealed | 9 | Farmer, Tref (1516) | Lost 0-2 | -201608 |
| 4sealed | 165 | Obrascovs, Felix (1435) | Won 2-0 | +151623 |
| 5sealed | 164 | Boutin, Jon (1748) | Lost 1-2 | -151608 |
| 6sealed | 256 | Gertridge, Levi (1523) | Won 2-0 | +161624 |
| 7sealed | 162 | Lau, Benson (1493) | Won 2-0 | +161640 |
| 8sealed | 79 | Fortin, Christian (1606) | Won 2-1 | +171657 |
| 9sealed | 101 | Rubin, Will (1667) | Won 2-0 | +181675 |
| 10draft | 10 | Darbyshire, Elliott (1667) | Lost 0-2 | -181657 |
| 11draft | 21 | Beauchemin, Samuel (1615) | Won 2-1 | +171674 |
| 12draft | 60 | Blais Bourget, Gabriel (1586) | Won 2-0 | +171691 |
| 13draft | 3 | Freel, Dan (1733) | Lost 1-2 | -181673 |
| 14draft | 23 | Provencal, Gabriel (1597) | Won 2-1 | +171690 |
| 15draft | 32 | White, Sam (1591) | Lost 0-2 | -201670 |
| top | average opponent: 1600record: 9-5 | new rating: 1670 | ||
| Grand Prix Ottawa 2014 (KTK limited) | starting rating: 1576 | |||
| round | table | opponent (rating) | result | Δrating |
| 2sealed | 291 | Scott, Rob (1517) | Won 2-0 | +171593 |
| 3sealed | 4 | Caux, Jean-Sebastien (1537) | Won 2-0 | +171610 |
| 4sealed | 53 | Siow, Lucas (1798) | Won 2-1 | +211631 |
| 5sealed | 58 | Gervais, Pierre-Luc (1515) | Lost 1-2 | -201611 |
| 6sealed | 141 | Song, John (1520) | Won 2-1 | +161627 |
| 7sealed | 37 | Wintle, David (1558) | Won 2-0 | +171644 |
| 8sealed | 55 | Li, Chen (1868) | Lost 0-2 | -141630 |
| 9sealed | 119 | Dicaire, Dan (1540) | Lost 0-2 | -201610 |
| top | average opponent: 1606record: 5-3 | new rating: 1610 | ||
| Grand Prix New Jersey 2014 (legacy) | starting rating: 1541 | |||
| round | table | opponent (rating) | result | Δrating |
| 2legacy | 1711 | Nelson, Joel (1549) | Draw 1-1 | 01541 |
| 3legacy | 1689 | Lapierre, Yannick (1527) | Lost 1-2 | -181523 |
| 4legacy | 1825 | Phillinger, Matt (1499) | Won 2-1 | +171540 |
| 5legacy | 1700 | Lacker, Jonathan (1483) | Won 2-1 | +171557 |
| 6legacy | 1575 | Krock, Tim (1534) | Won 2-1 | +181575 |
| 7legacy | 1506 | Leung, Justin (1559) | Won 2-0 | +181593 |
| 8legacy | 1462 | Kim, Jason (1643) | Lost 1-2 | -171576 |
| top | average opponent: 1542record: 4-2-1 | new rating: 1576 | ||
| Grand Prix Orlando 2014 (KTK limited) | starting rating: 1541 | |||
| round | table | opponent (rating) | result | Δrating |
| 2sealed | 747 | Lauer, Steven (1503) | Won 2-1 | +181559 |
| 3sealed | 168 | Weingard, Daniel (1679) | Lost 1-2 | -161543 |
| 4sealed | 139 | Anderson, Isaac (1518) | Won 0-0 | +171560 |
| 5sealed | 184 | Blackwelder, Nolan (1714) | Won 2-0 | +211581 |
| 6sealed | 125 | Eltarhoni, Adam (1410) | Lost 0-2 | -211560 |
| 7sealed | 169 | Jetha, David (1498) | Lost 0-2 | -191541 |
| top | average opponent: 1554record: 3-3 | new rating: 1541 | ||
| Grand Prix Boston-Worcester 2014 (modern) | starting rating: 1591 | |||
| round | table | opponent (rating) | result | Δrating |
| 1modern | 320 | Tucker, Brian (1500) | Won 2-0 | +161607 |
| 2modern | 18 | Suriel, Eliazar (1514) | Draw 1-1 | -11606 |
| 3modern | 235 | Ares, Nicolas (1561) | Lost 1-2 | -191587 |
| 4modern | 379 | Hoyt, Matthew (1400) | Won 2-1 | +141601 |
| 5modern | 264 | Colby-robbins, Derek (1463) | Lost 0-2 | -201581 |
| 6modern | 352 | Clothier, Charles (1501) | Draw 1-1 | -21579 |
| 7modern | 321 | Hill, Adam (1543) | Lost 0-2 | -181561 |
| 8modern | 266 | Shen, Xiangyu (1487) | Lost 0-2 | -201541 |
| top | average opponent: 1496record: 2-4-2 | new rating: 1541 | ||
| Grand Prix Richmond 2014 (modern) | starting rating: 1538 | |||
| round | table | opponent (rating) | result | Δrating |
| 1modern | 235 | Bailey, Andrew (1538) | Won 2-1 | +181556 |
| 2modern | 203 | Luther, James (1518) | Won 2-0 | +171573 |
| 3modern | 68 | Brakke, Kris (1514) | Won 2-1 | +171590 |
| 4modern | 101 | Goldstein, Danny (1731) | Lost 0-2 | -151575 |
| 5modern | 161 | Neufeldt, Alexander (1720) | Lost 1-2 | -161559 |
| 6modern | 228 | Hoagland, Derek (1519) | Won 2-0 | +171576 |
| 7modern | 264 | Fisher, Ryan (1532) | Lost 1-2 | -181558 |
| 8modern | 271 | Venier, Dennis (1517) | Won 2-1 | +171575 |
| 9modern | 158 | Leydens, Kerey (1466) | Won 2-1 | +161591 |
| top | average opponent: 1562record: 6-3 | new rating: 1591 | ||
| Grand Prix Toronto 2013 (THS limited) | starting rating: 1536 | |||
| round | table | opponent (rating) | result | Δrating |
| 2sealed | 39 | Smith, Brandon (1576) | Draw 1-1 | +11537 |
| 3sealed | 308 | Ma, Thomas (1679) | Won 2-0 | +201557 |
| 4sealed | 200 | Eng, Jeff (1536) | Won 2-0 | +181575 |
| 5sealed | 60 | Theriault, Madison (1521) | Lost 0-2 | -191556 |
| 6sealed | 222 | Lee, Justin (1537) | Lost 0-2 | -181538 |
| top | average opponent: 1570record: 2-2-1 | new rating: 1538 | ||
| Grand Prix Miami 2013 (DGM standard) | starting rating: 1522 | |||
| round | table | opponent (rating) | result | Δrating |
| 1standard | 95 | Mark, Lee (1490) | Lost 1-2 | -191503 |
| 2standard | 381 | Arias, Camilo A (1482) | Lost 1-2 | -181485 |
| 3standard | 459 | Forman, David (1463) | Won 2-0 | +171502 |
| 4standard | 415 | Silver, Arlie (1482) | Won 2-1 | +181520 |
| 5standard | 434 | Asher, Adam (1499) | Won 2-1 | +181538 |
| 6standard | 265 | Nakata, Brian (1516) | Lost 1-2 | -191519 |
| 7standard | 289 | D'Adesky, Andrew (1498) | Won 2-1 | +181537 |
| 8standard | 264 | Leake, Jesse (1523) | Won 2-1 | +181555 |
| 9standard | 167 | Wetherson, Mitchell (1533) | Lost 0-2 | -191536 |
| top | average opponent: 1498record: 5-4 | new rating: 1536 | ||
| Grand Prix Quebec City 2013 (GTC standard) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1standard | 104 | Gaspari, Philip-Gianni (1500) | Won 2-0 | +181518 |
| 2standard | 23 | Birrell, Taylor (1500) | Lost 0-2 | -181500 |
| 3standard | 166 | Pedersen, Chris (1500) | Lost 0-2 | -181482 |
| 4standard | 332 | Boissinot, Karel (1482) | Won 2-0 | +181500 |
| 5standard | 247 | Monh, Christopher (1518) | Won 2-0 | +181518 |
| 6standard | 214 | Castonguay, Christopher (1574) | Won 2-1 | +191537 |
| 7standard | 125 | Everson, Mark (1555) | Won 2-0 | +181555 |
| 8standard | 76 | Trottier, Charles (1691) | Lost 0-2 | -151540 |
| 9standard | 133 | Halsey, Stephen (1535) | Lost 0-2 | -181522 |
| top | average opponent: 1539record: 5-4 | new rating: 1522 | ||