| 1697 | 1707.6 | 20 | 20 | Jacobs, CN (Calvin Nicholas) | | GTP | 1974.7 | 1988.1 | South African Junior Closed Chess Championships 2025 (U16 Open) | 9 | 2025-04-05 | S | W | 0 | 0.22 | -0.22 | -4.4 | 0.22 | -0.22 | -4.4 |
| 1687.2 | 1698.7 | 20 | 20 | Jacobs, CN (Calvin Nicholas) | | GTP | 1961.6 | 1966.5 | 2025 KSNG Open (A) | 1 | 2025-02-22 | S | B | 0 | 0.14 | -0.14 | -2.3 | 0.15 | -0.15 | -3 |
| 1728.1 | 1727.5 | 20 | 20 | Jacobs, CN (Calvin Nicholas) | | GTP | 1969.5 | 1984.1 | Bojanala's FIDE In The Sparkling Waters 2024 (Prestige) | 5 | 2024-08-18 | S | B | 0 | 0.18 | -0.18 | -3.6 | 0.16 | -0.16 | -3.2 |
| 1778.1 | 1784 | 20 | 20 | Jacobs, CN (Calvin Nicholas) | | GTP | 1727.9 | 1732.8 | South African Junior Closed Chess Championship 2024 (U16 Open) | 6 | 2024-04-29 | S | W | 0 | 0.6 | -0.6 | -12 | 0.6 | -0.6 | -12 |
| 1500.4 | 1527.5 | 20 | 20 | Jacobs, CN (Calvin Nicholas) | | GTP | 1689.7 | 1681.5 | 2022 Blou Bul Open (A) | 2 | 2022-06-25 | S | B | 0 | 0.24 | -0.24 | -4.5 | 0.28 | -0.28 | -5.6 |
| 1512.6 | 1512.8 | 20 | 20 | Jacobs, CN (Calvin Nicholas) | | GTP | 1573.4 | 1585.8 | South African Junior Closed Chess Championships 2022 (U14 Open) | 9 | 2022-04-01 | S | W | 0 | 0.47 | -0.47 | -9.4 | 0.46 | -0.46 | -9.2 |
| 1449.8 | 1441.7 | 20 | 20 | Jacobs, CN (Calvin Nicholas) | | GTP | 1489.3 | 1485.3 | 2021 Etienne Lewis Closed Trials (U14 Open) | 3 | 2021-09-24 | S | B | 0 | 0.41 | -0.41 | -7.7 | 0.41 | -0.41 | -8.2 |
| 1353.5 | 1344.9 | 20 | 20 | Jacobs, CN (Calvin Nicholas) | | GTP | 1503.3 | 1504 | 2019 Centurion Chess Tournament | 2 | 2019-10-09 | S | W | 0 | 0.37 | -0.37 | -6.1 | 0.36 | -0.36 | -7.2 |
| 1045 | 1034.2 | 20 | 20 | Jacobs, CN (Calvin Nicholas) | | GTP | 923.8 | 930.8 | 2018 Lubowski Open (C) | 3 | 2018-05-12 | S | B | 0 | 0.6 | -0.6 | -11.3 | 0.58 | -0.58 | -11.6 |
| 1052.5 | 1076.6 | 20 | 20 | Jacobs, CN (Calvin Nicholas) | | GTP | 882.8 | 887.6 | 2018 Capablanca Swiss (C) | 6 | 2018-04-28 | S | B | 1 | 0.66 | 0.34 | 6.4 | 0.68 | 0.32 | 6.4 |
| 805.8 | 805.8 | 20 | 20 | Jacobs, CN (Calvin Nicholas) | | GTP | 760.8 | 760.8 | South African Junior Wildcard Championships 2017 (U10 Open) | 6 | 2018-01-11 | S | B | 1 | 0.51 | 0.49 | 9.8 | 0.51 | 0.49 | 9.8 |
