| 1750 | 1565.5 | 20 | 20 | Van Der Merwe, S (Schalk Wolf) | JM | WCT | 1753.5 | 1709.7 | Laerskool Welgemoed Rapid 2026 (U12) | 6 | 2026-02-14 | R | W | 0.5 | 0.54 | -0.04 | -0.4 | 0.37 | 0.13 | 2.6 |
| 1868.8 | 1522.4 | 20 | 20 | Van Der Merwe, S (Schalk Wolf) | JM | WCT | 1711.2 | 1709.5 | Curro Chess Open Rapid 2025 (U12) | 5 | 2025-08-23 | R | B | 0.5 | 0.64 | -0.14 | -1.5 | 0.24 | 0.26 | 5.2 |
| 1474.4 | 1502.1 | 20 | 20 | Van Der Merwe, S (Schalk Wolf) | | WCT | 1642.7 | 1722.5 | Cape of Good Hope Open 2025 (U10) | 4 | 2025-02-22 | R | W | 0 | 0.35 | -0.35 | -3.8 | 0.29 | -0.29 | -5.8 |
| 1544.3 | 1450.2 | 20 | 20 | Van Der Merwe, S (Schalk Wolf) | | WCT | 1546.4 | 1656 | Laerskool Welgemoed Rapid 2024 (U10) | 5 | 2024-10-19 | R | W | 0 | 0.54 | -0.54 | -5.8 | 0.3 | -0.3 | -6 |
| 1381.3 | 1508.1 | 20 | 20 | Van Der Merwe, S (Schalk Wolf) | | WCT | 1572.6 | 1677.6 | Hermanus Chess Club Open 2024 (Advanced) | 2 | 2024-04-20 | R | B | 0 | 0.24 | -0.24 | -2.3 | 0.26 | -0.26 | -5.2 |
| 1465.2 | 1490.5 | 20 | 20 | Van Der Merwe, S (Schalk Wolf) | | WCT | 1557.6 | 1645.4 | Western Cape Closed Championship 2023 (U10) | 5 | 2023-09-23 | R | B | 1 | 0.35 | 0.65 | 7 | 0.28 | 0.72 | 14.4 |
| 1409.4 | 1514.9 | 20 | 20 | Van Der Merwe, S (Schalk Wolf) | | WCT | 1447.8 | 1525 | Cape Town Open 2023 (U10) | 5 | 2023-03-25 | R | W | 0 | 0.5 | -0.5 | -5.4 | 0.53 | -0.53 | -10.6 |
| 1409.4 | 1514.9 | 20 | 20 | Van Der Merwe, S (Schalk Wolf) | | WCT | 1447.8 | 1525 | Cape Town Metro Schools Chess Closed Individuals 2023 (U9 Boys) | 4 | 2023-03-04 | R | B | 0.5 | 0.41 | 0.09 | 1.1 | 0.45 | 0.05 | 1 |
| 1423.8 | 1429.6 | 20 | 20 | Van Der Merwe, S (Schalk Wolf) | | WCT | 1231.1 | 1218.8 | Kenridge Rapid 2022 (U8) | 4 | 2022-11-05 | R | W | 1 | 0.77 | 0.23 | 2.5 | 0.79 | 0.21 | 4.2 |
| 1200 | 1200 | 20 | 20 | Van Der Merwe, S (Schalk Wolf) | | WCT | 1233.4 | 1200 | Laerskool Welgemoed 12th Annual Chess Challenge 2022 (U8+U10) | 1 | 2022-02-19 | R | W | 0 | 0.5 | -0.5 | -6 | 0.54 | -0.54 | -10.8 |
