| 1887.2 | 1898.7 | 20 | 20 | Jacobs, CN (Calvin Nicholas) | | GTP | 1961.6 | 1966.5 | 2025 Blou Bul Open Chess Tournament (A) | 5 | 2025-02-08 | S | B | 1 | 0.37 | 0.63 | 10.5 | 0.38 | 0.62 | 12.4 |
| 1926.5 | 1951.2 | 20 | 20 | Jacobs, CN (Calvin Nicholas) | | GTP | 1970.6 | 1978.1 | Gauteng Inter-Region at UJ 2024 (U18 Open) | 5 | 2024-12-08 | S | W | 0 | 0.49 | -0.49 | -9.2 | 0.51 | -0.51 | -10.2 |
| 1955.4 | 1980.5 | 20 | 20 | Jacobs, CN (Calvin Nicholas) | | GTP | 1914.1 | 1929.8 | 2024 Moja Chess Extravaganza (Prestige) | 8 | 2024-09-28 | S | W | 0 | 0.59 | -0.59 | -11.8 | 0.6 | -0.6 | -12 |
| 1684.4 | 1684.2 | 20 | 20 | Jacobs, CN (Calvin Nicholas) | | GTP | 1696.2 | 1713.7 | 2023 Piet Robbertse Fide Rated Open Chess Tournament (A) | 1 | 2023-02-04 | S | W | 1 | 0.53 | 0.47 | 8.8 | 0.51 | 0.49 | 9.8 |
| 1721 | 1724.2 | 20 | 20 | Jacobs, CN (Calvin Nicholas) | | GTP | 1661.4 | 1658.8 | 2022 Alekhine Open (A) | 2 | 2022-08-13 | S | W | 1 | 0.61 | 0.39 | 7.3 | 0.62 | 0.38 | 7.6 |
| 1669.7 | 1664.3 | 20 | 20 | Jacobs, CN (Calvin Nicholas) | | GTP | 1573.4 | 1585.8 | South African Junior Closed Chess Championships 2022 (U14 Open) | 8 | 2022-03-31 | S | W | 0 | 0.65 | -0.65 | -13 | 0.63 | -0.63 | -12.6 |
| 1450.3 | 1440.8 | 20 | 20 | Jacobs, CN (Calvin Nicholas) | | GTP | 1573.6 | 1574.6 | 2021 Registration Tournament (A) | 5 | 2021-03-13 | S | W | 0.5 | 0.4 | 0.1 | 1.7 | 0.39 | 0.11 | 2.2 |
| 1475.9 | 1474.6 | 20 | 20 | Jacobs, CN (Calvin Nicholas) | | GTP | 1642.6 | 1639 | 2019 South African Junior Team Championships (U12A) | 7 | 2020-01-08 | S | B | 0 | 0.26 | -0.26 | -5.2 | 0.27 | -0.27 | -5.4 |
| 1394.2 | 1389.8 | 20 | 20 | Jacobs, CN (Calvin Nicholas) | | GTP | 1503.3 | 1504 | The Joburg Open 2019 (Prestige) | 3 | 2019-10-12 | S | B | 0 | 0.33 | -0.33 | -5.5 | 0.33 | -0.33 | -6.6 |
| 1149.6 | 1154.7 | 20 | 20 | Jacobs, CN (Calvin Nicholas) | | GTP | 1103.6 | 1106.6 | 2018 Menlo Open Chess Tournament (C) | 4 | 2018-07-21 | S | W | 1 | 0.6 | 0.4 | 6.6 | 0.6 | 0.4 | 8 |
