Jarrell, Derek
Current rating: 1573
Record: 13-9
| Grand Prix Boston-Worcester 2014 (modern) | starting rating: 1535 | |||
| round | table | opponent (rating) | result | Δrating |
| 1modern | 145 | Rossetti, Alex (1500) | Won 2-0 | +181553 |
| 2modern | 86 | Wenokor, Gregory (1365) | Won 2-1 | +141567 |
| 3modern | 11 | Emery, Jeffrey (1478) | Won 2-1 | +171584 |
| 4modern | 65 | Weinstein, Zack (1553) | Won 2-0 | +171601 |
| 5modern | 65 | O'Donnell, Devon (1769) | Won 2-1 | +211622 |
| 6modern | 28 | Mengucci, Andrea (1949) | Lost 0-2 | -121610 |
| 7modern | 19 | Leon, Nick (1596) | Lost 1-2 | -181592 |
| 8modern | 142 | Lyons, Greg (1578) | Lost 1-2 | -191573 |
| top | average opponent: 1599record: 5-3 | new rating: 1573 | ||
| Grand Prix Boston-Worcester 2012 (M13 limited) | starting rating: 1558 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 122 | Rafferty, Zachary (1500) | Won 2-0 | +171575 |
| 2sealed | 437 | Muzio, Anthony (1501) | Won 2-0 | +161591 |
| 3sealed | 269 | Lapine, Michael (1655) | Lost 1-2 | -171574 |
| 4sealed | 333 | Sun, Ray (1498) | Lost 1-2 | -191555 |
| 5sealed | 625 | Mccloskey, Benjamin (1451) | Lost 0-2 | -201535 |
| top | average opponent: 1521record: 2-3 | new rating: 1535 | ||
| Grand Prix Providence 2011 (legacy) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1legacy | 531 | Taylor, Chris (1374) | Won 2-0 | +161516 |
| 2legacy | 411 | Davenport, Anthony J (1518) | Won 2-0 | +181534 |
| 3legacy | 455 | Clemmer, Garrett (1505) | Won 2-1 | +171551 |
| 4legacy | 423 | Quick, Gregory (1631) | Won 2-1 | +201571 |
| 5legacy | 411 | Richardson, Justin (1482) | Won 2-1 | +161587 |
| 6legacy | 416 | Feingersh, Rachel (1593) | Won 2-0 | +181605 |
| 7legacy | 406 | Damo da Rosa, Paulo Vitor (2085) | Lost 0-2 | -101595 |
| 8legacy | 427 | Merriam, Ross (1552) | Lost 0-2 | -181577 |
| 9legacy | 439 | Collett, Scott (1531) | Lost 0-2 | -191558 |
| top | average opponent: 1586record: 6-3 | new rating: 1558 | ||