| 1712.2 | 1694.2 | 20 | 20 | Stern, M (Mason) | JM | WCT | 1867.4 | 1852.3 | UCT Open Chess Championship 2025 (Championship) | 1 | 2025-10-10 | S | W | 0.5 | 0.36 | 0.14 | 2.6 | 0.36 | 0.14 | 2.8 |
| 1658.7 | 1639.1 | 20 | 20 | Stern, M (Mason) | JM | WCT | 1690 | 1693.8 | Western Cape Schools Individual Championship 2025 (U11 Boys) | 5 | 2025-05-18 | S | B | 1 | 0.42 | 0.58 | 9.6 | 0.39 | 0.61 | 12.2 |
| 1625.9 | 1524.9 | 20 | 20 | Stern, M (Mason) | | WCT | 1569.4 | 1480.6 | Curro Durbanville Chess Rapid Open 2024 (Championship) | 6 | 2024-07-13 | R | W | 1 | 0.61 | 0.39 | 5.1 | 0.59 | 0.41 | 8.2 |
| 1448.5 | 1420.8 | 20 | 20 | Stern, M (Mason) | | WCT | 1431.8 | 1421.1 | South African Junior Closed Chess Championship 2024 (U10 Open) | 9 | 2024-05-01 | S | B | 0.5 | 0.48 | 0.02 | 0.4 | 0.46 | 0.04 | 0.8 |
| 1481 | 1488.4 | 20 | 20 | Stern, M (Mason) | | WCT | 1465.2 | 1490.5 | Western Cape Closed Championship 2023 (U10) | 6 | 2023-09-23 | R | B | 0 | 0.48 | -0.48 | -5.2 | 0.46 | -0.46 | -9.2 |
| 1468.1 | 1440.3 | 20 | 20 | Stern, M (Mason) | | WCT | 1454.7 | 1384.5 | WP Closed 2023 (U10) | 4 | 2023-06-17 | S | B | 0 | 0.47 | -0.47 | -7.8 | 0.52 | -0.52 | -10.4 |
| 1470.3 | 1463.1 | 20 | 20 | Stern, M (Mason) | | WCT | 1378 | 1507.3 | Laerskool Welgemoed Rapid 2023 (U10) | 6 | 2023-02-11 | R | W | 1 | 0.65 | 0.35 | 3.8 | 0.49 | 0.51 | 10.2 |
| 1502 | 1534.7 | 20 | 20 | Stern, M (Mason) | | WCT | 1448.2 | 1395.4 | Kraaifontein Open 2022 (Intermediate) | 6 | 2022-12-18 | S | W | 1 | 0.6 | 0.4 | 7 | 0.7 | 0.3 | 6 |
| 1481.1 | 1376.9 | 20 | 20 | Stern, M (Mason) | | WCT | 1401.5 | 1269 | Curro Durbanville Chess Open Rapid 2022 (U8+U10) | 5 | 2022-07-02 | R | W | 1 | 0.63 | 0.37 | 4 | 0.67 | 0.33 | 6.6 |
| 1349.5 | 1304.8 | 20 | 20 | Stern, M (Mason) | | WCT | 1416.7 | 1365.5 | WP Closed 2022 (U8+U10) | 3 | 2022-06-16 | S | W | 0.5 | 0.46 | 0.04 | 0.7 | 0.47 | 0.03 | 0.6 |
| 1261.5 | 1241.6 | 20 | 20 | Stern, M (Mason) | | WCT | 1200 | 1200 | Laerskool Welgemoed 12th Annual Chess Challenge 2022 (U8+U10) | 5 | 2022-02-19 | R | B | 1 | 0.53 | 0.47 | 5.6 | 0.51 | 0.49 | 9.8 |
