| 1690.3 | 1692.9 | 20 | 20 | Koning, L (Lehan) | | GTP | 1611.1 | 1612 | 2023 Etienne Lewis Closed Tournament (U16) | 7 | 2023-08-27 | S | W | 1 | 0.63 | 0.37 | 7 | 0.64 | 0.36 | 7.2 |
| 1565.1 | 1561.1 | 20 | 20 | Koning, L (Lehan) | | GTP | 1433.9 | 1424.4 | 2022 Etienne Lewis (U16 Open) | 2 | 2022-09-03 | S | W | 1 | 0.69 | 0.31 | 5.8 | 0.7 | 0.3 | 6 |
| 1556.2 | 1549.3 | 20 | 20 | Koning, L (Lehan) | | GTP | 1567.9 | 1563.3 | South African Junior Closed Chess Championships 2022 (U14 Open) | 2 | 2022-03-28 | S | W | 0.5 | 0.53 | -0.03 | -0.6 | 0.53 | -0.03 | -0.6 |
| 1565.7 | 1561.1 | 20 | 20 | Koning, L (Lehan) | | GTP | 1532.1 | 1515 | 2021 Etienne Lewis Closed Trials (U14 Open) | 3 | 2021-09-24 | S | B | 0.5 | 0.5 | 0 | 0 | 0.51 | -0.01 | -0.2 |
| 1326.6 | 1301.1 | 20 | 20 | Koning, L (Lehan) | | GTP | 1383.4 | 1380.5 | 2019 Etienne Lewis Trials (U12 Boys) | 4 | 2019-08-31 | S | B | 0.5 | 0.39 | 0.11 | 2.2 | 0.37 | 0.13 | 2.6 |
| 1386.9 | 1356.8 | 20 | 20 | Koning, L (Lehan) | | GTP | 1438.1 | 1433.9 | 2019 Jacaranda Round Robin (E) | 5 | 2019-08-03 | S | W | 0 | 0.48 | -0.48 | -8 | 0.45 | -0.45 | -9 |
| 1013.1 | 1019.8 | 20 | 20 | Koning, L (Lehan) | | GTP | 1171.9 | 1176.3 | 2018 South African Junior Closed Chess Championships (U10 Open) | 2 | 2018-04-02 | S | W | 1 | 0.36 | 0.64 | 12.8 | 0.36 | 0.64 | 12.8 |
| 888 | 888 | 20 | 20 | Koning, L (Lehan) | | GTP | 958 | 958 | 2017 Chris Greyling (D) | 4 | 2017-04-22 | S | B | 1 | 0.4 | 0.6 | 10 | 0.6 | 0.4 | 8 |
| 679 | 679 | 20 | 20 | Koning, L (Lehan) | | GTP | 772 | 772 | Sa Junior Closed Chess Championship 2016 (U8 Boys) | 2 | 2016-03-21 | S | W | 0 | 0.37 | -0.37 | -7.4 | -0.37 | 0.37 | 7.4 |
| 758 | 758 | 20 | 20 | Koning, L (Lehan) | | GTP | 801 | 801 | South African Junior Team Championships 2015 (8A) | 6 | 2016-01-06 | S | W | 1 | 0.44 | 0.56 | 11.2 | 0.56 | 0.44 | 8.8 |
