| 1366.5 | 1322.7 | 20 | 20 | Van Der Westhuizen, C (Courtney) | | WCU | 1245.3 | 1304.3 | Upper West Coast Schools Prestige Individuals Championship 2026 (U18 Girls) | 3 | 2026-02-14 | R | W | 1 | 0.68 | 0.32 | 3.8 | 0.56 | 0.44 | 8.8 |
| 1292.9 | 1249.6 | 20 | 20 | Van Der Westhuizen, C (Courtney) | | WCU | 1253.8 | 1186.2 | West Coast Schools Chess Prestige 2025 (U17 Girls) | 4 | 2025-03-08 | S | W | 1 | 0.59 | 0.41 | 6.8 | 0.62 | 0.38 | 7.6 |
| 1261.5 | 1208.8 | 20 | 20 | Van Der Westhuizen, C (Courtney) | | WCU | 1187.7 | 1122.7 | West Coast Schools Prestige 2022 (U13 Girls) | 5 | 2022-02-19 | S | B | 1 | 0.54 | 0.46 | 7.6 | 0.56 | 0.44 | 8.8 |
| 1250.4 | 1244.3 | 20 | 20 | Van Der Westhuizen, C (Courtney) | | WCU | 1195.5 | 875.2 | Upper West Coast 2021 (U13) | 5 | 2021-09-04 | R | B | 0 | 0.52 | -0.52 | -4.9 | 0.89 | -0.89 | -17.8 |
| 1232.3 | 1230.6 | 20 | 20 | Van Der Westhuizen, C (Courtney) | | WCU | 1142.3 | 718.4 | West Coast Schools Prestige 2020 (U11 Girls) | 4 | 2020-03-07 | R | B | 1 | 0.56 | 0.44 | 5.3 | 0.99 | 0.01 | 0.2 |
| 1159.7 | 1102.8 | 20 | 20 | Van Der Westhuizen, C (Courtney) | | WCU | 1040.7 | 972.8 | Bo-Weskus Skole Prestige 2020 (O11 Dogters) | 4 | 2020-02-15 | S | W | 1 | 0.68 | 0.32 | 5.3 | 0.69 | 0.31 | 6.2 |
| 1220 | 1168.8 | 20 | 20 | Van Der Westhuizen, C (Courtney) | | WCU | 991.4 | 807.2 | Western Cape Schools Individuals 2019 (U11 Girls) | 6 | 2019-05-19 | S | W | 0 | 0.81 | -0.81 | -13.4 | 0.96 | -0.96 | -19.2 |
| 1200 | 1200 | 20 | 20 | Van Der Westhuizen, C (Courtney) | | WCU | 500 | 500 | West Coast Schools Prestige Individual Championship 2018 (U9 Girls) | 6 | 2018-03-24 | S | B | 0 | 0.99 | -0.99 | -16.4 | 0.99 | -0.99 | -19.8 |
