Derby, Tom
Current rating: 1399
Record: 3-9
| Grand Prix San Diego 2015 (ORI standard) | starting rating: 1446 | |||
| round | table | opponent (rating) | result | Δrating |
| 1standard | 441 | Thompson, Gage (1500) | Lost 1-2 | -171429 |
| 2standard | 400 | Rando, Alex (1452) | Lost 0-2 | -181411 |
| 3standard | 644 | Capen, Candice (1465) | Won 2-1 | +191430 |
| 4standard | 520 | Sweeney, Alex (1486) | Won 2-0 | +191449 |
| 5standard | 519 | Nishio, Kent (1526) | Lost 0-2 | -161433 |
| 6standard | 461 | Carsey, Timothy (1551) | Lost 1-2 | -161417 |
| 7standard | 429 | Prado, Bladimir (1417) | Lost 0-2 | -181399 |
| average opponent: 1485record: 2-5 | new rating: 1399 | |||
| Grand Prix Las Vegas 2015 (2) (MM2 limited) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 188 | Anderson, Tom (1500) | Lost 0-2 | -181482 |
| 2sealed | 483 | Melendez, Joseph (1482) | Lost 0-2 | -181464 |
| 3sealed | 534 | Howe, Logan (1463) | Won 2-0 | +181482 |
| 4sealed | 394 | Ouellette, Duncan (1482) | Lost 1-2 | -181464 |
| 5sealed | 407 | Carruthers, Kyle (1463) | Lost 0-2 | -181446 |
| average opponent: 1478record: 1-4 | new rating: 1446 | |||