| 1410.6 | 1405.1 | 20 | 20 | Van Der Merwe, W (Willem) | | GSV | 1312 | 1303.6 | Afrikaans High School Open 08 Feb 2025 (D) | 3 | 2025-02-08 | S | B | 1 | 0.57 | 0.43 | 7.1 | 0.58 | 0.42 | 8.4 |
| 1452 | 1436.5 | 20 | 20 | Van Der Merwe, W (Willem) | | GSV | 1363 | 1351.7 | Sedibeng East D7 Teams Trials 2024 (U13) | 5 | 2024-08-03 | S | B | 1 | 0.56 | 0.44 | 7.3 | 0.56 | 0.44 | 8.8 |
| 1382.7 | 1388.2 | 20 | 20 | Van Der Merwe, W (Willem) | | GSV | 1235.2 | 1234.5 | Laerskool Midvaal Chess Open Section 2024 (D) | 5 | 2024-02-10 | S | B | 1 | 0.63 | 0.37 | 6.1 | 0.64 | 0.36 | 7.2 |
| 1231.3 | 1233.5 | 20 | 20 | Van Der Merwe, W (Willem) | | GSV | 1309.8 | 1307.2 | Overvaal Ope Jul 2023 (D) | 3 | 2023-07-22 | S | W | 0 | 0.45 | -0.45 | -7.5 | 0.46 | -0.46 | -9.2 |
| 1213.7 | 1213.7 | 20 | 20 | Van Der Merwe, W (Willem) | | GSV | 1276.9 | 1260 | Gauteng Schools D7 2023 (U11 Boys) | 3 | 2023-05-20 | S | W | 1 | 0.47 | 0.53 | 8.8 | 0.49 | 0.51 | 10.2 |
