| 1544.2 | 1506.2 | 20 | 20 | Van Der Merwe, S (Schalk Wolf) | JM | WCT | 1753.5 | 1748.9 | CT Metro North Schools Chess Individual Trials 2026 (U11 Boys) | 4 | 2026-02-08 | S | W | 0 | 0.3 | -0.3 | -5 | 0.26 | -0.26 | -5.2 |
| 1566.1 | 1515.4 | 20 | 20 | Van Der Merwe, S (Schalk Wolf) | JM | WCT | 1756.3 | 1746.4 | Helderberg Chess Club Open 2026 (U11 Mixed) | 3 | 2026-01-17 | S | W | 0 | 0.32 | -0.32 | -5.3 | 0.27 | -0.27 | -5.4 |
| 1477.7 | 1468.8 | 20 | 20 | Van Der Merwe, S (Schalk Wolf) | JM | WCT | 1677.9 | 1669.2 | Cape Town Chess Junior League 2025 (U12) | 4 | 2025-05-31 | S | W | 0 | 0.31 | -0.31 | -5.1 | 0.31 | -0.31 | -6.2 |
| 1283.9 | 1256.1 | 20 | 20 | Van Der Merwe, S (Schalk Wolf) | | WCT | 1502.3 | 1674.5 | Cape Town Open Rapid Chess Championship 2024 (U10) | 3 | 2024-03-16 | R | B | 0 | 0.2 | -0.2 | -2.2 | 0 | 0 | 0 |
| 1235.1 | 1200 | 20 | 20 | Van Der Merwe, S (Schalk Wolf) | | WCT | 1521.7 | 1486.6 | North District School Trials 2024 (U9 Boys) | 5 | 2024-02-03 | S | B | 0 | 0.12 | -0.12 | -2 | 0.12 | -0.12 | -2.4 |
| 1242 | 1275.6 | 20 | 20 | Van Der Merwe, S (Schalk Wolf) | | WCT | 1493.7 | 1652.7 | Kraaifontein Open 2023 (U10) | 2 | 2023-12-09 | R | W | 0 | 0.25 | -0.25 | -3 | 0.1 | -0.1 | -2 |
