Telfer, Sian
Current rating: 1400
| Grand Prix London 2013 (GTC limited) | starting rating: 1429 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 586 | Mansson, Daniel (1703) | Lost 0-2 | -131416 |
| 2sealed | 767 | Halouska, Matej (1526) | Lost 0-2 | -161400 |
| top | average opponent: 1614record: 0-2 | new rating: 1400 | ||
| Grand Prix London 2011 (MBS limited) | starting rating: 1463 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 79 | Thorvaldsen, Kine (1452) | Lost 1-2 | -181445 |
| 2sealed | 121 | Green, James (1482) | Lost 1-2 | -171428 |
| 3sealed | 125 | Renard, Yves (1484) | Won 2-0 | +191447 |
| 4sealed | 135 | Laursen, Alexander (1472) | Lost 1-2 | -181429 |
| top | average opponent: 1473record: 1-3 | new rating: 1429 | ||
| Grand Prix Brighton 2009 (M10 limited) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 30 | Collins, Jackob (1500) | Lost 1-2 | -181482 |
| 2sealed | 260 | Roijen, Dominique (1471) | Lost 0-2 | -181464 |
| 3sealed | 307 | Haslam, Paul (1463) | Won 2-1 | +181482 |
| 4sealed | 327 | Bailey, Joshua [ENG] (1464) | Lost 1-2 | -191463 |
| top | average opponent: 1475record: 1-3 | new rating: 1463 | ||