| 1543.4 | 1500.7 | 20 | 20 | Van Der Merwe, S (Schalk Wolf) | JM | WCT | 1746 | 1712.8 | UCT Open Chess Championship 2025 (U10) | 4 | 2025-10-11 | R | W | 1 | 0.31 | 0.69 | 7.5 | 0.29 | 0.71 | 14.2 |
| 1482.1 | 1497.5 | 20 | 20 | Van Der Merwe, S (Schalk Wolf) | | WCT | 1642.7 | 1722.5 | Cape of Good Hope Open 2025 (U10) | 5 | 2025-02-22 | R | B | 0 | 0.27 | -0.27 | -2.9 | 0.2 | -0.2 | -4 |
| 1486.8 | 1437.5 | 20 | 20 | Van Der Merwe, S (Schalk Wolf) | | WCT | 1605.3 | 1577.1 | Helderberg Chess Club PS Development Tournament 2025 (U11 Boys) | 3 | 2025-01-25 | S | W | 0.5 | 0.4 | 0.1 | 1.7 | 0.38 | 0.12 | 2.4 |
| 1455.2 | 1507.7 | 20 | 20 | Van Der Merwe, S (Schalk Wolf) | | WCT | 1546.4 | 1656 | UCT Open Chess Championship 2024 (U10) | 5 | 2024-10-13 | R | W | 0 | 0.44 | -0.44 | -4.8 | 0.37 | -0.37 | -7.4 |
| 1459 | 1342.1 | 20 | 20 | Van Der Merwe, S (Schalk Wolf) | | WCT | 1502.3 | 1472.2 | Cape Town Metro Schools Chess Closed Individuals 2024 (U9 Boys) | 6 | 2024-03-03 | S | W | 0 | 0.49 | -0.49 | -8.1 | 0.39 | -0.39 | -7.8 |
| 1333.9 | 1355.9 | 20 | 20 | Van Der Merwe, S (Schalk Wolf) | | WCT | 1493.7 | 1652.7 | Kraaifontein Open 2023 (U10) | 4 | 2023-12-09 | R | B | 0 | 0.27 | -0.27 | -3.2 | 0.11 | -0.11 | -2.2 |
| 1249.2 | 1286.1 | 20 | 20 | Van Der Merwe, S (Schalk Wolf) | | WCT | 1410.4 | 1459.8 | Laerskool Welgemoed Rapid 2023 (U10) | 3 | 2023-02-11 | R | W | 0 | 0.35 | -0.35 | -3.8 | 0.34 | -0.34 | -6.8 |
