| 1607.6 | 1688.7 | 20 | 20 | Opperman, M (Matthew) | | WCU | 1578.9 | 1511.6 | Lower West Coast Top Schools 2025 (U19) | 4 | 2025-06-14 | R | B | 1 | 0.49 | 0.51 | 6.1 | 0.66 | 0.34 | 6.8 |
| 1450.9 | 1396.9 | 20 | 20 | Opperman, M (Matthew) | | WCU | 1480.1 | 1446.8 | West Coast High School Championships 2023 (U15 Boys) | 5 | 2023-02-18 | S | W | 1 | 0.51 | 0.49 | 8.1 | 0.48 | 0.52 | 10.4 |
| 1450.9 | 1484.4 | 20 | 20 | Opperman, M (Matthew) | | WCU | 1480.1 | 1346.8 | Lower West Coast High Schools Prestige 2023 (U15 Boys) | 5 | 2023-02-11 | R | W | 0 | 0.51 | -0.51 | -6.1 | 0.7 | -0.7 | -14 |
| 1497.6 | 1449.8 | 20 | 20 | Opperman, M (Matthew) | | WCU | 1467.2 | 1311.2 | West Coast Schools Chess Grand Challenge 2022 (HS Super) | 3 | 2022-10-29 | R | B | 0 | 0.49 | -0.49 | -5.9 | 0.62 | -0.62 | -12.4 |
| 1451.1 | 1424.2 | 20 | 20 | Opperman, M (Matthew) | | WCU | 1457.1 | 1479.5 | West Coast Schools Prestige 2022 (U15 Boys) | 5 | 2022-02-19 | S | W | 1 | 0.53 | 0.47 | 7.8 | 0.48 | 0.52 | 10.4 |
| 1485.1 | 1440.2 | 20 | 20 | Opperman, M (Matthew) | | WCU | 1480.1 | 1363.8 | Western Cape Schools Championship 2021 (U13 Boys) | 2 | 2021-10-02 | R | W | 1 | 0.55 | 0.45 | 5.9 | 0.63 | 0.37 | 7.4 |
| 1440.1 | 1365.8 | 20 | 20 | Opperman, M (Matthew) | | WCU | 1415.7 | 1229.6 | Western Cape Schools Kings & Queens 2019 (Boys) | 2 | 2019-10-12 | R | W | 0 | 0.57 | -0.57 | -6.8 | 0.7 | -0.7 | -14 |
| 1328.9 | 1302.9 | 20 | 20 | Opperman, M (Matthew) | | WCU | 1260.6 | 1212.8 | Weskus Skole Prestige Skaak Kampioenskappe 2019 (O11 Seuns) | 6 | 2019-04-06 | S | B | 0 | 0.54 | -0.54 | -9 | 0.56 | -0.56 | -11.2 |
| 1285.8 | 1230.2 | 20 | 20 | Opperman, M (Matthew) | | WCU | 1217 | 922.4 | Onder-Weskus Skole Proewe 2019 (O11 Seuns) | 4 | 2019-02-16 | R | W | 0 | 0.62 | -0.62 | -7.4 | 0.9 | -0.9 | -18 |
| 1201.2 | 1200 | 20 | 20 | Opperman, M (Matthew) | | WCU | 976.8 | 967.6 | West Coast Schools Prestige Individual Championship 2018 (U11 Boys) | 4 | 2018-03-10 | S | W | 1 | 0.8 | 0.2 | 3.3 | 0.81 | 0.19 | 3.8 |
