Sommerville, Duncan
Current rating: 1546
Record: 8-6-1
| Grand Prix Toronto 2017 (HOU limited) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 33 | Ferlaino, Nathan (1500) | Won 2-0 | +181518 |
| 2sealed | 119 | Cheung, Tom (1518) | Draw 1-1 | 01518 |
| 3sealed | 296 | Buckley, Sean (1717) | Won 2-1 | +211539 |
| 4sealed | 148 | Nguyen, Christopher (1470) | Won 2-1 | +171556 |
| 5sealed | 78 | Aiken, Simone (1745) | Won 2-1 | +211577 |
| 6sealed | 39 | Gauthier, Alain (1671) | Lost 0-2 | -161561 |
| 7sealed | 105 | Koffler, Richard (1509) | Won 2-0 | +171578 |
| 8sealed | 61 | Stewart, Ryan (1572) | Lost 0-2 | -181560 |
| 9sealed | 126 | Ward, Daniel (1785) | Lost 0-2 | -141546 |
| average opponent: 1610record: 5-3-1 | new rating: 1546 | |||
| Grand Prix Toronto 2015 (DTK standard) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1standard | 146 | Vollick, Matt (1500) | Won 2-0 | +181518 |
| 2standard | 336 | Cohn, Zachery (1551) | Lost 1-2 | -171501 |
| 3standard | 575 | Diminie, Josh (1488) | Won 2-1 | +171518 |
| 4standard | 372 | Butler, Adam (1519) | Won 2-1 | +181536 |
| 5standard | 98 | Le Du, Benjamin (1530) | Lost 1-2 | -181518 |
| 6standard | 243 | Kostecki, Ben (1480) | Lost 0-2 | -181500 |
| average opponent: 1511record: 3-3 | new rating: 1500 | |||