| 1536.3 | 1517.6 | 20 | 20 | Harmse, D (Deon) | | WOS | 1638.8 | 1649.1 | Hermanus Chess Club Invitational May 2025 | 1 | 2025-05-24 | S | B | 1 | 0.34 | 0.66 | 11 | 0.31 | 0.69 | 13.8 |
| 1531.3 | 1505.9 | 20 | 20 | Harmse, D (Deon) | | WOS | 1678.2 | 1686.7 | Hermanus Chess Club Invitational January 2025 | 2 | 2025-01-11 | S | B | 1 | 0.29 | 0.71 | 11.8 | 0.25 | 0.75 | 15 |
| 1556.5 | 1543 | 20 | 20 | Harmse, D (Deon) | | WOS | 1615.8 | 1627.6 | Overberg GP Invitational Day 2 2024 (A) | 2 | 2024-09-27 | S | B | 0 | 0.39 | -0.39 | -6.5 | 0.36 | -0.36 | -7.2 |
| 1556.5 | 1543 | 20 | 20 | Harmse, D (Deon) | | WOS | 1615.8 | 1627.6 | Overberg GP Invitational Day 1 2024 (A) | 2 | 2024-09-26 | S | W | 0 | 0.47 | -0.47 | -7.8 | 0.44 | -0.44 | -8.8 |
| 1451.7 | 1451.1 | 20 | 20 | Harmse, D (Deon) | | WOS | 1644.8 | 1666.8 | Overberg High Schools Trails 2024 (U18 Boys) | 5 | 2024-03-02 | S | W | 0 | 0.32 | -0.32 | -5.3 | 0.29 | -0.29 | -5.8 |
| 1443.6 | 1275.4 | 20 | 20 | Harmse, D (Deon) | | WOS | 1634.8 | 1434.9 | Overberg High Schools Trails 2024 (U18) | 5 | 2024-02-24 | R | W | 0 | 0.32 | -0.32 | -3 | 0.36 | -0.36 | -7.2 |
| 1453.8 | 1279.4 | 20 | 20 | Harmse, D (Deon) | | WOS | 1639 | 1414.4 | Overberg Open Rapid 2024 (Open) | 4 | 2024-01-27 | R | W | 0 | 0.33 | -0.33 | -3.1 | 0.38 | -0.38 | -7.6 |
| 1414.1 | 1356.3 | 20 | 20 | Harmse, D (Deon) | | WOS | 1429.7 | 1410.3 | Overberg High School Closed 2023 (U17 Boys) | 5 | 2023-03-25 | S | B | 0 | 0.44 | -0.44 | -7.3 | 0.4 | -0.4 | -8 |
| 1411.9 | 1210.6 | 20 | 20 | Harmse, D (Deon) | | WOS | 1402.6 | 1290.9 | Overberg Schools Open Tournament 2023 (U18) | 4 | 2023-02-11 | R | B | 0 | 0.47 | -0.47 | -4.4 | 0.36 | -0.36 | -7.2 |
| 1244 | 1222.5 | 20 | 20 | Harmse, D (Deon) | | WOS | 1298.7 | 1270 | OCF Youth Day Tournament 2022 (A) | 4 | 2022-06-18 | R | W | 0 | 0.48 | -0.48 | -3.7 | 0.49 | -0.49 | -9.8 |
| 1268.6 | 1205.2 | 20 | 20 | Harmse, D (Deon) | | WOS | 1278 | 1277.6 | The Hermanus Open 2022 (Open) | 5 | 2022-05-14 | R | B | 0.5 | 0.45 | 0.05 | 0.3 | 0.37 | 0.13 | 2.6 |
| 1266 | 1200 | 20 | 20 | Harmse, D (Deon) | | WOS | 1229.2 | 1200 | OCF Open 2022 (U18) | 5 | 2022-04-09 | R | W | 0 | 0.58 | -0.58 | -7 | 0.54 | -0.54 | -10.8 |
