| 1753.5 | 1709.7 | 20 | 20 | Stern, M (Mason) | JM | WCT | 1750 | 1565.5 | Laerskool Welgemoed Rapid 2026 (U12) | 6 | 2026-02-14 | R | B | 0.5 | 0.46 | 0.04 | 0.4 | 0.63 | -0.13 | -2.6 |
| 1711.2 | 1709.5 | 20 | 20 | Stern, M (Mason) | JM | WCT | 1868.8 | 1522.4 | Curro Chess Open Rapid 2025 (U12) | 5 | 2025-08-23 | R | W | 0.5 | 0.36 | 0.14 | 1.5 | 0.76 | -0.26 | -5.2 |
| 1723.1 | 1640.6 | 20 | 20 | Stern, M (Mason) | | WCT | 1616.9 | 1627.1 | South African Junior Closed Chess Championships 2025 (U10 Open) | 4 | 2025-04-01 | S | W | 0 | 0.67 | -0.67 | -13.4 | 0.56 | -0.56 | -11.2 |
| 1674.5 | 1589.7 | 20 | 20 | Stern, M (Mason) | | WCT | 1531.6 | 1481.5 | CT Metro Schools Individual Closed 2025 (U11 Open) | 3 | 2025-03-01 | S | B | 0.5 | 0.62 | -0.12 | -2 | 0.58 | -0.08 | -1.6 |
| 1642.7 | 1722.5 | 20 | 20 | Stern, M (Mason) | | WCT | 1474.4 | 1502.1 | Cape of Good Hope Open 2025 (U10) | 4 | 2025-02-22 | R | B | 1 | 0.65 | 0.35 | 3.8 | 0.71 | 0.29 | 5.8 |
| 1546.4 | 1656 | 20 | 20 | Stern, M (Mason) | | WCT | 1544.3 | 1450.2 | Laerskool Welgemoed Rapid 2024 (U10) | 5 | 2024-10-19 | R | B | 1 | 0.46 | 0.54 | 5.8 | 0.7 | 0.3 | 6 |
| 1572.8 | 1528.5 | 20 | 20 | Stern, M (Mason) | | WCT | 1431.8 | 1421.1 | South African Junior Closed Chess Championship 2024 (U10 Open) | 4 | 2024-04-28 | S | W | 1 | 0.71 | 0.29 | 5.8 | 0.67 | 0.33 | 6.6 |
| 1572.8 | 1528.5 | 20 | 20 | Stern, M (Mason) | | WCT | 1431.8 | 1421.1 | Western Cape PS Individuals Championship 2024 (U9 Boys) | 6 | 2024-05-05 | S | W | 0.5 | 0.71 | -0.21 | -3.5 | 0.67 | -0.17 | -3.4 |
| 1572.6 | 1677.6 | 20 | 20 | Stern, M (Mason) | | WCT | 1381.3 | 1508.1 | Hermanus Chess Club Open 2024 (Advanced) | 2 | 2024-04-20 | R | W | 1 | 0.76 | 0.24 | 2.3 | 0.74 | 0.26 | 5.2 |
| 1502.3 | 1472.2 | 20 | 20 | Stern, M (Mason) | | WCT | 1386 | 1320.6 | Cape Town Metro Schools Chess Closed Individuals 2024 (U9 Boys) | 5 | 2024-03-03 | S | W | 1 | 0.68 | 0.32 | 5.3 | 0.72 | 0.28 | 5.6 |
| 1557.6 | 1645.4 | 20 | 20 | Stern, M (Mason) | | WCT | 1465.2 | 1490.5 | Western Cape Closed Championship 2023 (U10) | 5 | 2023-09-23 | R | W | 0 | 0.65 | -0.65 | -7 | 0.72 | -0.72 | -14.4 |
| 1447.8 | 1525 | 20 | 20 | Stern, M (Mason) | | WCT | 1409.4 | 1514.9 | Cape Town Open 2023 (U10) | 5 | 2023-03-25 | R | B | 1 | 0.5 | 0.5 | 5.4 | 0.47 | 0.53 | 10.6 |
| 1447.8 | 1525 | 20 | 20 | Stern, M (Mason) | | WCT | 1409.4 | 1514.9 | Cape Town Metro Schools Chess Closed Individuals 2023 (U9 Boys) | 4 | 2023-03-04 | R | W | 0.5 | 0.59 | -0.09 | -1.1 | 0.55 | -0.05 | -1 |
| 1231.1 | 1218.8 | 20 | 20 | Stern, M (Mason) | | WCT | 1423.8 | 1429.6 | Kenridge Rapid 2022 (U8) | 4 | 2022-11-05 | R | B | 0 | 0.23 | -0.23 | -2.5 | 0.21 | -0.21 | -4.2 |
| 1233.4 | 1200 | 20 | 20 | Stern, M (Mason) | | WCT | 1200 | 1200 | Laerskool Welgemoed 12th Annual Chess Challenge 2022 (U8+U10) | 1 | 2022-02-19 | R | B | 1 | 0.5 | 0.5 | 6 | 0.46 | 0.54 | 10.8 |
