| 1379.2 | 1395.4 | 20 | 20 | Kapp, S (Sebastian) | | ENM | 1711.4 | 1723.4 | 2025 Mzansi Inter Provincial Team Championships (U14 Open) | 1 | 2025-12-15 | S | B | 0 | 0.07 | -0.07 | -1.2 | 0.08 | -0.08 | -1.6 |
| 1526.3 | 1520.2 | 20 | 20 | Kapp, S (Sebastian) | | ENM | 1738.4 | 1740 | EC Closed 2025 (U14 Boys) | 2 | 2025-09-06 | S | B | 0 | 0.21 | -0.21 | -3.9 | 0.2 | -0.2 | -4 |
| 1458.8 | 1451.6 | 20 | 20 | Kapp, S (Sebastian) | | ENM | 1774 | 1773.5 | Eastern Cape Inter-Regional Team Chess Championship 2025 (U14) | 5 | 2025-07-11 | S | B | 0 | 0.09 | -0.09 | -1.5 | 0.08 | -0.08 | -1.6 |
| 1453.9 | 1454 | 20 | 20 | Kapp, S (Sebastian) | | ENM | 1707.5 | 1709.3 | NMBCU Open 2025 (B) | 2 | 2025-05-24 | S | W | 0 | 0.25 | -0.25 | -4.3 | 0.24 | -0.24 | -4.8 |
| 1453.9 | 1454 | 20 | 20 | Kapp, S (Sebastian) | | ENM | 1707.5 | 1709.3 | NMBCU Trial 4 2025 (U14) | 5 | 2025-05-10 | S | B | 0 | 0.16 | -0.16 | -2.7 | 0.16 | -0.16 | -3.2 |
| 1453.9 | 1454 | 20 | 20 | Kapp, S (Sebastian) | | ENM | 1707.5 | 1709.3 | EC Open 2025 (U8-U14 Boys) | 3 | 2025-05-02 | S | B | 0 | 0.16 | -0.16 | -3 | 0.16 | -0.16 | -3.2 |
| 1457.3 | 1453.7 | 20 | 20 | Kapp, S (Sebastian) | | ENM | 1679.1 | 1702.2 | NMB 3rd Trials 2025 (U14) | 2 | 2025-04-12 | S | B | 1 | 0.2 | 0.8 | 13.3 | 0.17 | 0.83 | 16.6 |
| 1299.1 | 1303.9 | 20 | 20 | Kapp, S (Sebastian) | | ENM | 1570.1 | 1566.8 | NMBCH Trial 1 2025 (U14) | 1 | 2025-02-14 | S | W | 0 | 0.23 | -0.23 | -3.8 | 0.24 | -0.24 | -4.8 |
| 1270.4 | 1271.8 | 20 | 20 | Kapp, S (Sebastian) | | ENM | 1553.2 | 1555.4 | NMBCU Closed 2024 (U14) | 2 | 2024-09-21 | S | B | 0 | 0.13 | -0.13 | -2.2 | 0.13 | -0.13 | -2.6 |
| 1353.1 | 1365.3 | 20 | 20 | Kapp, S (Sebastian) | | ENM | 1549.8 | 1571.2 | NMBCU Trials 2 2024 (U14) | 2 | 2024-04-13 | S | W | 0 | 0.31 | -0.31 | -5.1 | 0.3 | -0.3 | -6 |
| 1340.6 | 1365.7 | 20 | 20 | Kapp, S (Sebastian) | | ENM | 1529.7 | 1568 | Pearson Open Chess Tournament 2024 (B) | 1 | 2024-02-23 | S | W | 0 | 0.32 | -0.32 | -5.3 | 0.31 | -0.31 | -6.2 |
| 1151.7 | 1091.7 | 20 | 20 | Kapp, S (Sebastian) | | ENM | 1336 | 1359.9 | NMB 1st Trials 2023 (U12) | 4 | 2023-02-18 | S | B | 0 | 0.24 | -0.24 | -4 | 0.15 | -0.15 | -3 |
| 1109.9 | 1096 | 20 | 20 | Kapp, S (Sebastian) | | ENM | 1200 | 1200 | 2022 NMB Junior Trials 2 (U10) | 4 | 2022-05-14 | S | W | 0 | 0.44 | -0.44 | -7.3 | 0.42 | -0.42 | -8.4 |
