| 1573.5 | 1564.3 | 20 | 20 | Van Der Merwe, S (Schalk Wolf) | JM | WCT | 1654.4 | 1628.2 | Western Cape Schools Individual Championship 2025 (U11 Boys) | 6 | 2025-05-18 | S | W | 1 | 0.45 | 0.55 | 9.1 | 0.47 | 0.53 | 10.6 |
| 1508.5 | 1554.3 | 20 | 20 | Van Der Merwe, S (Schalk Wolf) | | WCT | 1642.7 | 1722.5 | Laerskool Welgemoed Rapid 2025 (U12) | 6 | 2025-02-15 | R | B | 0 | 0.3 | -0.3 | -3.6 | 0.26 | -0.26 | -5.2 |
| 1460.4 | 1471.2 | 20 | 20 | Van Der Merwe, S (Schalk Wolf) | | WCT | 1572.8 | 1528.5 | South African Junior Closed Chess Championship 2024 (U10 Open) | 2 | 2024-04-27 | S | B | 0 | 0.33 | -0.33 | -6.6 | 0.39 | -0.39 | -7.8 |
| 1540.3 | 1436.1 | 20 | 20 | Van Der Merwe, S (Schalk Wolf) | | WCT | 1558.1 | 1435.3 | Western Cape PS Individuals 2023 (U9 Boys) | 6 | 2023-05-06 | S | B | 0 | 0.44 | -0.44 | -7.3 | 0.46 | -0.46 | -9.2 |
| 1469.3 | 1437.2 | 20 | 20 | Van Der Merwe, S (Schalk Wolf) | | WCT | 1395.8 | 1404.8 | WP Closed 2022 (U8+U10) | 3 | 2022-06-16 | S | W | 1 | 0.63 | 0.37 | 6.4 | 0.58 | 0.42 | 8.4 |
| 1420.2 | 1359.1 | 20 | 20 | Van Der Merwe, S (Schalk Wolf) | | WCT | 1239.5 | 1235.6 | Metro WP Schools Chess Trials 2022 (U7+U9 Boys) | 3 | 2022-04-23 | S | W | 1 | 0.75 | 0.25 | 4.1 | 0.69 | 0.31 | 6.2 |
| 1200 | 1200 | 20 | 20 | Van Der Merwe, S (Schalk Wolf) | | WCT | 1200 | 1200 | 2022 Cape Of Good Hope Open (U10) | 6 | 2022-01-30 | S | W | 1 | 0.54 | 0.46 | 8 | 0.54 | 0.46 | 9.2 |
