| 1333.9 | 1325.8 | 20 | 20 | Van Der Merwe, W (Willem) | | GSV | 1321 | 1334.6 | Vaalpark Primary Chess Open 2024 (D) | 5 | 2024-04-13 | S | W | 1 | 0.56 | 0.44 | 7.3 | 0.53 | 0.47 | 9.4 |
| 1365 | 1352.8 | 20 | 20 | Van Der Merwe, W (Willem) | | GSV | 1235.2 | 1234.5 | NG Kerk Vanderbijlpark Suid 2024 (D) | 5 | 2024-02-24 | S | B | 0 | 0.61 | -0.61 | -10.1 | 0.6 | -0.6 | -12 |
| 1310.2 | 1293.7 | 20 | 20 | Van Der Merwe, W (Willem) | | GSV | 1314.6 | 1311.9 | NWU Vaal Open 2023 (D) | 5 | 2023-10-14 | S | W | 0.5 | 0.54 | -0.04 | -0.7 | 0.52 | -0.02 | -0.4 |
| 1310.2 | 1200 | 20 | 20 | Van Der Merwe, W (Willem) | | GSV | 1314.6 | 1200 | Dr Pieter Hangelbroek Rapid 2023 (C) | 3 | 2023-10-28 | R | B | 1 | 0.45 | 0.55 | 6.6 | 0.46 | 0.54 | 10.8 |
| 1208 | 1208 | 20 | 20 | Van Der Merwe, W (Willem) | | GSV | 1262.3 | 1277 | Eureka Open 2022 (G+H) | 5 | 2022-07-30 | S | B | 0 | 0.4 | -0.4 | -6.6 | 0.38 | -0.38 | -7.6 |
