| 1596.2 | 1439.3 | 20 | 20 | Van Der Merwe, S (Schalk Wolf) | JM | WCT | 1711.2 | 1709.5 | Curro Chess Open Rapid 2025 (U12) | 6 | 2025-08-23 | R | W | 0 | 0.41 | -0.41 | -4.4 | 0.23 | -0.23 | -4.6 |
| 1462.5 | 1475.1 | 20 | 20 | Van Der Merwe, S (Schalk Wolf) | | WCT | 1572.8 | 1528.5 | South African Junior Closed Chess Championship 2024 (U10 Open) | 6 | 2024-04-29 | S | B | 0.5 | 0.33 | 0.17 | 3.4 | 0.4 | 0.1 | 2 |
| 1360.2 | 1410.6 | 20 | 20 | Van Der Merwe, S (Schalk Wolf) | | WCT | 1493.7 | 1652.7 | Kraaifontein Open 2023 (U10) | 3 | 2023-12-09 | R | B | 0 | 0.3 | -0.3 | -3.6 | 0.18 | -0.18 | -3.6 |
| 1336.7 | 1436 | 20 | 20 | Van Der Merwe, S (Schalk Wolf) | | WCT | 1447.8 | 1525 | Cape Town Open 2023 (U10) | 3 | 2023-03-25 | R | W | 0.5 | 0.41 | 0.09 | 1 | 0.44 | 0.06 | 1.2 |
| 1336.7 | 1436 | 20 | 20 | Van Der Merwe, S (Schalk Wolf) | | WCT | 1447.8 | 1525 | Cape Town Metro Schools Chess Closed Individuals 2023 (U9 Boys) | 3 | 2023-03-04 | R | W | 0 | 0.41 | -0.41 | -4.9 | 0.44 | -0.44 | -8.8 |
| 1309.8 | 1219 | 20 | 20 | Van Der Merwe, S (Schalk Wolf) | | WCT | 1239.5 | 1235.6 | Metro WP Schools Chess Trials 2022 (U7+U9 Boys) | 5 | 2022-04-23 | S | W | 0 | 0.62 | -0.62 | -10.3 | 0.52 | -0.52 | -10.4 |
