| 1780.9 | 1807.5 | 20 | 20 | Jacobs, CN (Calvin Nicholas) | | GTP | 1727.9 | 1732.8 | South African Junior Closed Chess Championship 2024 (U16 Open) | 7 | 2024-04-30 | S | B | 0 | 0.52 | -0.52 | -10.4 | 0.55 | -0.55 | -11 |
| 1701.4 | 1699.3 | 20 | 20 | Jacobs, CN (Calvin Nicholas) | | GTP | 1680.3 | 1689.7 | 2023 Lubowski Open Tournament (A) | 2 | 2023-06-24 | S | B | 0.5 | 0.48 | 0.02 | 0.4 | 0.47 | 0.03 | 0.6 |
| 1595.4 | 1592.5 | 20 | 20 | Jacobs, CN (Calvin Nicholas) | | GTP | 1689 | 1708.4 | 2023 Tshwane Chess Open Registration Tournament (A) | 2 | 2023-01-28 | S | B | 0 | 0.35 | -0.35 | -5.8 | 0.32 | -0.32 | -6.4 |
| 1556.2 | 1549.3 | 20 | 20 | Jacobs, CN (Calvin Nicholas) | | GTP | 1573.4 | 1585.8 | South African Junior Closed Chess Championships 2022 (U14 Open) | 6 | 2022-03-30 | S | W | 0 | 0.52 | -0.52 | -10.4 | 0.5 | -0.5 | -10 |
| 1565.7 | 1561.1 | 20 | 20 | Jacobs, CN (Calvin Nicholas) | | GTP | 1489.3 | 1485.3 | 2021 Etienne Lewis Closed Trials (U14 Open) | 4 | 2021-09-25 | S | W | 0 | 0.63 | -0.63 | -11.8 | 0.63 | -0.63 | -12.6 |
| 1326.6 | 1301.1 | 20 | 20 | Jacobs, CN (Calvin Nicholas) | | GTP | 1488.8 | 1487.7 | 2019 Etienne Lewis Trials (U12 Boys) | 7 | 2019-09-01 | S | B | 0 | 0.27 | -0.27 | -5.4 | 0.24 | -0.24 | -4.8 |
| 1251.6 | 1241.1 | 20 | 20 | Jacobs, CN (Calvin Nicholas) | | GTP | 1413.1 | 1384.8 | 2019 Tshwane Chess Registration Tournament (B) | 3 | 2019-01-26 | S | W | 1 | 0.35 | 0.65 | 10.8 | 0.37 | 0.63 | 12.6 |
