Marr, Sam
Current rating: 1607
Record: 23-19
| Grand Prix Hartford 2018 (modern) | starting rating: 1475 | |||
| round | table | opponent (rating) | result | Δrating |
| 1modern | 145 | Dziedziak, Matthew (1551) | Won 2-1 | +191494 |
| 2modern | 38 | Guerrera, Angelo (1518) | Won 2-1 | +181512 |
| 3modern | 129 | DeWitt, Jeremie (1536) | Won 2-0 | +191531 |
| 4modern | 88 | Eichelberger, Gregory (1424) | Lost 0-2 | -201511 |
| 5modern | 235 | Durso, Andrew (1438) | Won 2-1 | +171528 |
| 6modern | 88 | Magararu, Juris (1436) | Won 2-0 | +161544 |
| 7modern | 84 | Artusa, Joseph (1583) | Lost 1-2 | -171527 |
| 8modern | 239 | Dias, Manuel (1563) | Won 2-0 | +181545 |
| 9modern | 302 | Catterfeld, Kurt (1546) | Won 2-0 | +181563 |
| 10modern | 299 | Carlino, Steffen (1680) | Won 2-0 | +201583 |
| 11modern | 227 | Pierson, Brandon (1608) | Lost 0-2 | -171566 |
| 12modern | 241 | Rothman, Matthew (1567) | Won 2-1 | +181584 |
| 13modern | 229 | Gareau, Philippe (1646) | Won 2-1 | +191603 |
| 14modern | 244 | Saracino, Jacob (1862) | Won 2-1 | +231626 |
| 15modern | 218 | King, Shawn (1608) | Lost 0-2 | -191607 |
| top | average opponent: 1571record: 11-4 | new rating: 1607 | ||
| Grand Prix Boston-Worcester 2014 (modern) | starting rating: 1446 | |||
| round | table | opponent (rating) | result | Δrating |
| 1modern | 854 | Pynn, Nick (1572) | Won 2-0 | +201466 |
| 2modern | 830 | Miller, Avery (1518) | Lost 1-2 | -171449 |
| 3modern | 1052 | Callahan-Cormier, Devin (1563) | Won 2-0 | +201469 |
| 4modern | 880 | Sugarman-lash, Faolan (1518) | Won 2-1 | +191488 |
| 5modern | 801 | Hall, Daniel W (1650) | Won 2-1 | +211509 |
| 6modern | 820 | Kazhdan, Ben (1549) | Lost 0-2 | -171492 |
| 7modern | 917 | Blair, Tom (1536) | Lost 0-2 | -171475 |
| top | average opponent: 1558record: 4-3 | new rating: 1475 | ||
| Grand Prix Boston-Worcester 2012 (M13 limited) | starting rating: 1440 | |||
| round | table | opponent (rating) | result | Δrating |
| 2sealed | 177 | Verno, Aharon (1466) | Lost 0-2 | -181422 |
| 3sealed | 562 | Race, Allan (1450) | Lost 1-2 | -171405 |
| 4sealed | 750 | Kanaan, David (1512) | Won 2-0 | +201425 |
| 5sealed | 660 | Vincek, Christopher (1459) | Won 2-1 | +181443 |
| 6sealed | 448 | Myers, Denton (1501) | Won 2-0 | +191462 |
| 7sealed | 355 | Hunt, Dan (1550) | Lost 0-2 | -161446 |
| top | average opponent: 1490record: 3-3 | new rating: 1446 | ||
| Grand Prix Kansas City 2011 (NPH limited) | starting rating: 1480 | |||
| round | table | opponent (rating) | result | Δrating |
| 4sealed | 121 | Landriz, Erik (1863) | Lost 1-2 | -121468 |
| 5sealed | 90 | Kirby, Ian (1540) | Lost 1-2 | -161452 |
| 6sealed | 239 | Watanabe, Yuuya (1808) | Lost 0-2 | -121440 |
| top | average opponent: 1737record: 0-3 | new rating: 1440 | ||
| Grand Prix Washington DC 2010 (ROE standard) | starting rating: 1534 | |||
| round | table | opponent (rating) | result | Δrating |
| 2standard | 135 | Pasco, Joseph A (1518) | Lost 0-2 | -181516 |
| 3standard | 182 | Morrill, Alex (1499) | Lost 0-2 | -181498 |
| 4standard | 324 | Doyle, Patrick (1483) | Lost 0-2 | -181480 |
| top | average opponent: 1500record: 0-3 | new rating: 1480 | ||
| Grand Prix Boston 2009 (M10 limited) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 482 | Boissonneault, ??? 3006 (1500) | Won 2-0 | +181518 |
| 2sealed | 411 | Santana, Rodney (1517) | Won 2-1 | +181536 |
| 3sealed | 496 | Pipitone, Michael (1537) | Won 2-0 | +181554 |
| 4sealed | 419 | Macary, Blake P (1519) | Won 2-0 | +171571 |
| 5sealed | 412 | Durney, Ryan (1534) | Lost 0-2 | -181553 |
| 6sealed | 479 | Lane, David (1536) | Lost 1-2 | -191534 |
| 7sealed | 538 | Doehlert, Spencer (1543) | Won 2-1 | +191553 |
| 8sealed | 503 | Costa, Matthew (1548) | Lost 1-2 | -191534 |
| top | average opponent: 1529record: 5-3 | new rating: 1534 | ||