Colthurst, Thomas
Current rating: 1507
Record: 5-5
| Grand Prix Boston 2003 (LGN limited) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 2sealed | 47 | Brooks, Craig (1518) | Lost 0-2 | -171483 |
| 3sealed | 103 | An, Kevin (1466) | Won 2-1 | +171500 |
| 4sealed | 152 | Terry, Steven (1501) | Won 2-1 | +181518 |
| 5sealed | 98 | Holbrook, Jeremy (1522) | Lost 0-2 | -171501 |
| 6sealed | 109 | Fischer, Adam (1643) | Won 2-1 | +201521 |
| 7sealed | 103 | McKenna, Timothy (1756) | Lost 1-2 | -141507 |
| average opponent: 1568record: 3-3 | new rating: 1507 | |||
| Grand Prix Boston 2001 (PLS limited) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 78 | Higgins, Matt (1500) | Won 2-1 | +181518 |
| 2sealed | 55 | Johnson, Michael (1519) | Won 2-0 | +181536 |
| 3sealed | 58 | McGuffin, Max (1535) | Lost 0-2 | -181518 |
| 4sealed | 143 | David-Marshall, Brian (1543) | Lost 0-2 | -181500 |
| average opponent: 1524record: 2-2 | new rating: 1500 | |||