| 1877.8 | 1886.7 | 24 | 24 | Weideman, J (Janko) | | WCT | 1758.9 | 1743.8 | South African Junior Closed Chess Championship 2026 (U14 Open) | 6 | 2026-03-31 | S | B | 1 | 0.6 | 0.4 | 9.7 | 0.62 | 0.38 | 9 |
| 1814.4 | 1824.8 | 24 | 24 | Weideman, J (Janko) | | WCT | 1790.1 | 1774.6 | CT Metro Schools Individual Closed 2026 (U15 Boys) | 4 | 2026-03-08 | S | B | 1 | 0.49 | 0.51 | 10.5 | 0.52 | 0.48 | 11.6 |
| 1814.4 | 1824.8 | 24 | 24 | Weideman, J (Janko) | | WCT | 1790.1 | 1774.6 | CT Metro North Schools Chess Individual Trials 2026 (U15 Boys) | 6 | 2026-02-15 | S | W | 1 | 0.57 | 0.43 | 8.6 | 0.6 | 0.4 | 9.6 |
| 1812.3 | 1821.9 | 20 | 20 | Weideman, J (Janko) | | WCT | 1778 | 1760.8 | COGH 2026 (Championship) | 6 | 2026-02-01 | S | B | 0.5 | 0.5 | 0 | 0 | 0.53 | -0.03 | -0.6 |
| 1866.4 | 1878.7 | 20 | 20 | Weideman, J (Janko) | | WCT | 1839.2 | 1807 | UCT Open Chess Championship 2025 (Championship) | 5 | 2025-10-12 | S | W | 0 | 0.57 | -0.57 | -10.7 | 0.63 | -0.63 | -12.6 |
| 1875.4 | 1891.5 | 20 | 20 | Weideman, J (Janko) | | WCT | 1818.5 | 1795.1 | Western Cape Schools Individual Championship 2025 (U13 Boys) | 6 | 2025-05-18 | S | B | 1 | 0.52 | 0.48 | 8 | 0.57 | 0.43 | 8.6 |
| 1845.1 | 1858 | 20 | 20 | Weideman, J (Janko) | | WCT | 1737.6 | 1722.4 | Cape Town Open Chess Festival 2025 (A) | 2 | 2025-03-22 | S | B | 0.5 | 0.58 | -0.08 | -1.5 | 0.62 | -0.12 | -2.4 |
| 1845.1 | 1858 | 20 | 20 | Weideman, J (Janko) | | WCT | 1737.6 | 1722.4 | CT Metro Schools Individual Closed 2025 (U13 Open) | 6 | 2025-03-02 | S | W | 1 | 0.67 | 0.33 | 5.6 | 0.7 | 0.3 | 6 |
| 1850.6 | 1852.2 | 20 | 20 | Weideman, J (Janko) | | WCT | 1710.3 | 1707.7 | Cape of Good Hope Open 2025 (Championship) | 6 | 2025-02-23 | S | B | 0.5 | 0.62 | -0.12 | -2 | 0.63 | -0.13 | -2.6 |
| 1850.6 | 1852.2 | 20 | 20 | Weideman, J (Janko) | | WCT | 1710.3 | 1707.7 | CT Metro North Schools Chess Individual Trials 2025 (U13 Open) | 6 | 2025-02-09 | S | B | 0.5 | 0.62 | -0.12 | -2 | 0.63 | -0.13 | -2.6 |
| 1776.3 | 1762.8 | 20 | 20 | Weideman, J (Janko) | | WCT | 1673.6 | 1666.8 | 2nd Strategize To Win Round-Robin Tournament ACL 2024 (A) | 5 | 2024-12-07 | S | W | 1 | 0.66 | 0.34 | 5.9 | 0.65 | 0.35 | 7 |
| 1548.2 | 1554 | 20 | 20 | Weideman, J (Janko) | | WCT | 1497.9 | 1515.8 | Cape Winelands Open 2023 (Advanced) | 3 | 2023-07-22 | S | B | 0.5 | 0.52 | -0.02 | -0.3 | 0.5 | 0 | 0 |
| 1498.7 | 1478.4 | 20 | 20 | Weideman, J (Janko) | | WCT | 1457.3 | 1476.4 | WP Closed 2023 (U12) | 5 | 2023-06-17 | S | B | 1 | 0.51 | 0.49 | 8.5 | 0.46 | 0.54 | 10.8 |
| 1498.4 | 1380.1 | 20 | 20 | Weideman, J (Janko) | | WCT | 1477.5 | 1441.6 | Cape Town Metro Schools Chess Closed Individuals 2023 (U11 Boys) | 5 | 2023-03-04 | S | W | 0.5 | 0.57 | -0.07 | -1.2 | 0.47 | 0.03 | 0.6 |
| 1447.1 | 1327.5 | 20 | 20 | Weideman, J (Janko) | | WCT | 1426.1 | 1379.2 | North District School Trials 2023 (U11 Boys) | 6 | 2023-02-04 | S | B | 0 | 0.48 | -0.48 | -8 | 0.4 | -0.4 | -8 |
| 1272.3 | 1200 | 20 | 20 | Weideman, J (Janko) | | WCT | 1459 | 1433.6 | South African Open 2022 (U12) | 4 | 2022-07-12 | S | B | 1 | 0.24 | 0.76 | 14.3 | 0.19 | 0.81 | 16.2 |
