Williamson, David [ENG]
Current rating: 1454
Record: 11-15-1
| Grand Prix London 2019 (WAR sealed) | starting rating: 1466 | |||
| round | table | opponent (rating) | result | Δrating |
| C1sealed | 349 | Minahan, Keane (1650) | Lost 0-2 | -151451 |
| C2sealed | 362 | Magalhaes, Hugo (1526) | Won 2-0 | +191470 |
| C3sealed | 221 | Tay, Filbert (1534) | Lost 0-2 | -161454 |
| C4sealed | 254 | Mills, Christopher (1478) | Lost 0-2 | -181436 |
| C5sealed | 220 | Magerl, David (1429) | Won 2-0 | +181454 |
| top | average opponent: 1523record: 2-3 | new rating: 1454 | ||
| Grand Prix Prague 2017 (AER limited) | starting rating: 1416 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 533 | Pelzl, Michael (1519) | Draw 1-1 | +11417 |
| 2sealed | 470 | Wessman, Filip (1499) | Lost 0-2 | -161401 |
| 3sealed | 815 | Scricciolo, Pietro (1405) | Lost 1-2 | -181383 |
| 4sealed | 896 | Stepanek, Karl (1466) | Won 2-1 | +201403 |
| 5sealed | 776 | Roxendal, Ola (1492) | Won 2-1 | +191422 |
| 6sealed | 608 | Brothwell, Seth (1535) | Lost 1-2 | -161406 |
| 7sealed | 675 | Baumgaertner, Tobias (1427) | Won 2-1 | +191425 |
| 8sealed | 561 | Kylen, Alexander (1512) | Won 2-0 | +191444 |
| 9sealed | 434 | Nizon, Jerome (1637) | Won 2-0 | +221466 |
| top | average opponent: 1499record: 5-3-1 | new rating: 1466 | ||
| Grand Prix London 2016 (KLD limited) | starting rating: 1464 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 13 | Klein, Fabian (1727) | Lost 0-2 | -131451 |
| 2sealed | 811 | Shultz, Andrew (1483) | Lost 0-2 | -181433 |
| 3sealed | 1204 | Rice, Conna (1464) | Won 2-0 | +191452 |
| 4sealed | 916 | Patten, Jack (1382) | Won 2-1 | +161468 |
| 5sealed | 881 | Leiper-Durrant, Tom (1499) | Lost 1-2 | -171451 |
| 6sealed | 827 | Burns, Lawrence (1364) | Lost 0-2 | -201431 |
| 7sealed | 857 | Milivojevic, Marko (1550) | Lost 0-2 | -151416 |
| top | average opponent: 1495record: 2-5 | new rating: 1416 | ||
| Grand Prix Liverpool 2015 (FRF limited) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 468 | Azzoni, Emanuele (1556) | Lost 0-2 | -171483 |
| 2sealed | 629 | Andersson, Toby (1559) | Lost 0-2 | -171466 |
| 3sealed | 124 | Kay, John (1462) | Won 2-0 | +181484 |
| 4sealed | 676 | McDonald, Marianne (1392) | Won 2-1 | +171501 |
| 5sealed | 395 | Foster, Charles (1496) | Lost 0-2 | -181483 |
| 6sealed | 514 | [anonymous] | Lost 0-2 | -191464 |
| top | average opponent: 1485record: 2-4 | new rating: 1464 | ||