Shaffer, Matthew
Current rating: 1576
Record: 40-35-2
| Grand Prix Tampa Bay 2019 (modern) | starting rating: 1564 | |||
| round | table | opponent (rating) | result | Δrating |
| 1modern | 25 | Jordan, Matt (1464) | Draw 1-1 | -21562 |
| 2modern | 241 | Bell, Cody (1411) | Won 2-0 | +151577 |
| 3modern | 194 | Sugalski, Bryan (1521) | Won 2-0 | +171594 |
| 4modern | 107 | Camejo, Martin (1651) | Won 2-0 | +191613 |
| 5modern | 51 | Mendel, Dominik (1491) | Lost 0-2 | -201593 |
| 6modern | 121 | Morantes, Simon (1587) | Won 2-1 | +181611 |
| 7modern | 77 | Vale, Jonathan (1717) | Lost 0-2 | -161595 |
| 8modern | 138 | Cole, Bodie (1536) | Lost 1-2 | -191576 |
| top | average opponent: 1547record: 4-3-1 | new rating: 1576 | ||
| Grand Prix Orlando 2018 (M19 standard) | starting rating: 1617 | |||
| round | table | opponent (rating) | result | Δrating |
| 1standard | 42 | Maddalena, Todd (1453) | Won 2-0 | +151632 |
| 2standard | 172 | Johnson, Christopher (1510) | Lost 0-2 | -201612 |
| 3standard | 291 | Bollenback, David (1519) | Lost 1-2 | -201592 |
| 4standard | 339 | Morantes, Simon (1536) | Lost 1-2 | -191573 |
| 5standard | 420 | Koehn, Shawn (1483) | Won 2-0 | +161589 |
| 6standard | 349 | Jones, Ryan (1526) | Won 2-0 | +171606 |
| 7standard | 278 | Kurtz, Joshua (1367) | Lost 0-2 | -221584 |
| 8standard | 224 | Paez, Yared (1479) | Lost 0-2 | -201564 |
| top | average opponent: 1484record: 3-5 | new rating: 1564 | ||
| Grand Prix Orlando 2017 (AER limited) | starting rating: 1655 | |||
| round | table | opponent (rating) | result | Δrating |
| 2sealed | 689 | Harvey, Travis (1481) | Won 2-1 | +151670 |
| 3sealed | 611 | Hostutler, Justin (1821) | Lost 1-2 | -151655 |
| 4sealed | 751 | Rios, Justin (1737) | Lost 0-2 | -171638 |
| 5sealed | 912 | Lowry, William (1705) | Lost 1-2 | -171621 |
| 6sealed | 964 | Zimmerman, Michael (1467) | Won 2-1 | +161637 |
| 7sealed | 880 | Heinemann, Adam (1538) | Lost 0-2 | -201617 |
| top | average opponent: 1625record: 2-4 | new rating: 1617 | ||
| Grand Prix Atlanta 2016 (KLD limited) | starting rating: 1658 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 774 | Jones, Travis (1536) | Won 2-1 | +161674 |
| 2sealed | 684 | Jerez, Leo (1518) | Won 2-1 | +151689 |
| 3sealed | 629 | Johnson, Christopher (1625) | Lost 0-2 | -191670 |
| 4sealed | 810 | Kurtz, James (1484) | Lost 0-2 | -221648 |
| 5sealed | 895 | Larson, Andrew (1545) | Won 2-1 | +161664 |
| 6sealed | 973 | Rios, Justin (1780) | Won 2-1 | +201684 |
| 7sealed | 729 | Bordelon, Zachary (1559) | Won 2-1 | +161700 |
| 8sealed | 755 | Kothari, Vipul (1672) | Won 2-0 | +181718 |
| 9sealed | 604 | Lanceford, Graham (1733) | Lost 1-2 | -181700 |
| 10draft | 912 | Thomas, Travis (1591) | Lost 0-2 | -201680 |
| 11draft | 944 | Paxton, Christopher (1572) | Won 2-0 | +161696 |
| 12draft | 952 | Vanover, Logan (1567) | Lost 1-2 | -201676 |
| 13draft | 975 | Stokes, James (1536) | Lost 0-2 | -211655 |
| top | average opponent: 1594record: 7-6 | new rating: 1655 | ||
| Grand Prix Charlotte 2015 (modern) | starting rating: 1527 | |||
| round | table | opponent (rating) | result | Δrating |
| 2modern | 1296 | Hardie, Brian (1570) | Won 2-1 | +191546 |
| 3modern | 1351 | Zhuo, David (1552) | Won 2-0 | +181564 |
| 4modern | 1314 | Kendall, Phillip W (1554) | Won 2-0 | +181582 |
| 5modern | 1076 | Baxter III, Lincoln (1628) | Won 2-1 | +181600 |
| 6modern | 1069 | Grimes, Adam (1588) | Won 2-1 | +181618 |
| 7modern | 958 | Allen, Jake (1612) | Won 2-0 | +181636 |
| 8modern | 782 | Utter-Leyton, Josh (2007) | Won 2-0 | +241660 |
| 9modern | 697 | Nam, Sung Wook (1907) | Won 2-0 | +231683 |
| 10modern | 616 | Malone, Michael (1706) | Lost 1-2 | -181665 |
| 11modern | 631 | Garnier, Spencer (1786) | Lost 0-2 | -151650 |
| 12modern | 625 | Umberson, JD (1615) | Lost 1-2 | -191631 |
| 13modern | 678 | Edel, Willy (1935) | Won 2-1 | +231654 |
| 14modern | 636 | Kegley, Benjamin (1677) | Won 2-0 | +191673 |
| 15modern | 629 | Cho, Joshua (1846) | Lost 1-2 | -151658 |
| top | average opponent: 1713record: 10-4 | new rating: 1658 | ||
| Grand Prix Orlando 2014 (KTK limited) | starting rating: 1565 | |||
| round | table | opponent (rating) | result | Δrating |
| 3sealed | 171 | Seuzeneau, Brandon (1536) | Lost 0-2 | -191546 |
| 4sealed | 294 | Poindexter, Stephen (1501) | Lost 0-0 | -181528 |
| 5sealed | 365 | Patton, Brandon (1514) | Won 2-1 | +171545 |
| 6sealed | 264 | Baxter, Billy (1516) | Lost 0-2 | -181527 |
| top | average opponent: 1517record: 1-3 | new rating: 1527 | ||
| Grand Prix Boston-Worcester 2014 (modern) | starting rating: 1480 | |||
| round | table | opponent (rating) | result | Δrating |
| 1modern | 917 | Hiles, Christopher (1584) | Lost 1-2 | -171463 |
| 2modern | 1025 | Dupsha, Christopher (1440) | Won 2-1 | +181481 |
| 3modern | 1153 | Dufour, Terrence (1635) | Won 2-0 | +211502 |
| 4modern | 1051 | Dituri, Philip (1452) | Draw 1-1 | -11501 |
| 5modern | 955 | Giaimo, Michael (1472) | Won 2-0 | +171518 |
| 6modern | 851 | Boswell, Andrew (1797) | Lost 0-2 | -131505 |
| 7modern | 947 | Baeckstrom, Andrew (1708) | Won 2-0 | +221527 |
| 8modern | 867 | McGee, Ross (1623) | Won 2-0 | +201547 |
| 9modern | 814 | Hu, Alexander (1555) | Won 2-0 | +181565 |
| top | average opponent: 1585record: 6-2-1 | new rating: 1565 | ||
| Grand Prix Atlanta 2014 (JOU limited) | starting rating: 1516 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 582 | Sauls, Zac (1516) | Lost 1-2 | -181498 |
| 2sealed | 590 | Reilvitz, Andres (1467) | Lost 0-2 | -181480 |
| top | average opponent: 1491record: 0-2 | new rating: 1480 | ||
| Grand Prix Richmond 2014 (modern) | starting rating: 1481 | |||
| round | table | opponent (rating) | result | Δrating |
| 1modern | 387 | Potter, Ryan (1455) | Won 2-0 | +181499 |
| 2modern | 335 | Negri, Kazu (1439) | Won 2-1 | +171516 |
| 3modern | 228 | Osowski, Richard (1405) | Lost 0-2 | -201496 |
| 4modern | 355 | Davies, Brendan (1535) | Won 2-1 | +181514 |
| 5modern | 156 | Snyder, Drew (1490) | Won 2-0 | +181532 |
| 6modern | 160 | Donegan, Dylan (1706) | Won 2-1 | +211553 |
| 7modern | 224 | Rodgers, Ronald (1487) | Lost 1-2 | -191534 |
| 8modern | 110 | Krontz, Jason (1550) | Lost 0-2 | -181516 |
| top | average opponent: 1508record: 5-3 | new rating: 1516 | ||
| Grand Prix Miami 2013 (DGM standard) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1standard | 36 | Ambert, Lou Erik (1500) | Won 2-0 | +181518 |
| 2standard | 182 | Thomas, Tanner (1518) | Lost 1-2 | -181500 |
| 3standard | 403 | Ladyman, Korey (1447) | Lost 0-2 | -191481 |
| 4standard | 484 | Rowe, Louis (1484) | Won 2-0 | +181499 |
| 5standard | 313 | Stutt, Adam (1508) | Lost 1-2 | -181481 |
| top | average opponent: 1491record: 2-3 | new rating: 1481 | ||