Summerville, David
Current rating: 1472
| Grand Prix Brisbane 2019 (ELD standard) | starting rating: 1491 | |||
| round | table | opponent (rating) | result | Δrating |
| 1standard | 149 | Jiggens, Jack (1500) | Won 2-0 | +191510 |
| 2standard | 101 | Ong, Qian Chern (1467) | Won 1-0 | +171527 |
| 3standard | 29 | Bagot, Andrew (1490) | Lost 0-2 | -191508 |
| 4standard | 56 | Wang, Zijian (1520) | Lost 1-2 | -181490 |
| 5standard | 103 | Hampstead, Sean (1480) | Lost 0-2 | -181472 |
| top | average opponent: 1491record: 2-3 | new rating: 1472 | ||
| Grand Prix Sydney 2019 (RNA limited) | starting rating: 1482 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 174 | Cale, Brendan (1500) | Won 2-1 | +181500 |
| 2sealed | 10 | Diaz, Ariel (1451) | Won 2-0 | +171517 |
| 3sealed | 63 | Matsushita, Takashi (1784) | Lost 1-2 | -131504 |
| 4sealed | 84 | Ma, Junjie (1493) | Lost 1-2 | -181486 |
| 5sealed | 181 | Ivatts, Davin (1524) | Won 2-1 | +181504 |
| 6sealed | 116 | Mihic, Sava (1798) | Lost 1-2 | -131491 |
| top | average opponent: 1592record: 3-3 | new rating: 1491 | ||
| Grand Prix Melbourne 2018 (GRN limited) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 198 | Boyanton, Grantley (1521) | Draw 1-1 | 01500 |
| 2sealed | 206 | Lawson, Colin (1500) | Lost 1-2 | -181482 |
| 3sealed | 339 | Fowles, Chris (1395) | Lost 1-2 | -191463 |
| 4sealed | 365 | Pintarich, Paul (1464) | Won 2-1 | +181481 |
| 5sealed | 300 | Bennett, David (1351) | Won 2-0 | +151496 |
| 6sealed | 229 | Wootton, Nigel (1528) | Won 2-0 | +191515 |
| 7sealed | 164 | Naughton, Paul (1627) | Lost 1-2 | -161499 |
| 8sealed | 143 | Hung, Jason (1527) | Lost 0-2 | -171482 |
| top | average opponent: 1489record: 3-4-1 | new rating: 1482 | ||