Welberry, David
Current rating: 1448
Record: 4-7
| Grand Prix Birmingham 2018 (std) (DOM standard) | starting rating: 1470 | |||
| round | table | opponent (rating) | result | Δrating |
| 1standard | 218 | Barnes, Louis (1500) | Lost 0-2 | -181452 |
| 2standard | 319 | Chumbley, Gareth (1478) | Won 2-1 | +191471 |
| 3standard | 334 | Beever, Simeon (1402) | Lost 1-2 | -201451 |
| 4standard | 510 | Malone, William (1395) | Won 2-1 | +171468 |
| 5standard | 326 | Pearson, Zak (1338) | Lost 0-2 | -201448 |
| average opponent: 1423record: 2-3 | new rating: 1448 | |||
| Grand Prix Manchester 2016 (SOI standard) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1standard | 413 | Caswell, Kevin (1540) | Lost 0-2 | -171483 |
| 2standard | 428 | Boast, Mark (1482) | Lost 0-2 | -181465 |
| 3standard | 783 | McNulty, Ryan [ENG] (1464) | Won 2-1 | +181483 |
| 4standard | 607 | Chapman, Nick (1447) | Won 2-1 | +171500 |
| 5standard | 600 | Wall, Oskar (1811) | Lost 0-2 | -121488 |
| 6standard | 556 | Dimakos, Michail (1486) | Lost 0-2 | -181470 |
| average opponent: 1538record: 2-4 | new rating: 1470 | |||