| 1157.3 | 1138.5 | 20 | 20 | Van Der Merwe, W (Willem) | | GSV | 1321 | 1334.6 | Hoerskool Overvaal Chess Open 2024 (D) | 4 | 2024-04-20 | S | W | 0 | 0.35 | -0.35 | -5.8 | 0.31 | -0.31 | -6.2 |
| 1193.5 | 1176.7 | 20 | 20 | Van Der Merwe, W (Willem) | | GSV | 1235.2 | 1234.5 | NG Kerk Vanderbijlpark Suid 2024 (D) | 4 | 2024-02-24 | S | W | 0 | 0.49 | -0.49 | -8.1 | 0.47 | -0.47 | -9.4 |
| 1053.7 | 1028.8 | 20 | 20 | Van Der Merwe, W (Willem) | | GSV | 1391.9 | 1392 | Dr Peter Hangelbroek Open 2022 (E) | 1 | 2022-10-29 | S | B | 0.5 | 0.06 | 0.44 | 7.3 | 0.04 | 0.46 | 9.2 |
| 1187.1 | 1183.2 | 20 | 20 | Van Der Merwe, W (Willem) | | GSV | 1183.7 | 1177.3 | Hoerskool Overvaal 2022 (D) | 1 | 2022-06-11 | S | W | 0 | 0.55 | -0.55 | -9.1 | 0.55 | -0.55 | -11 |
