| 1922.2 | 1939.4 | 20 | 20 | Jacobs, CN (Calvin Nicholas) | | GTP | 2168.5 | 2179.5 | 2025 Alekhine Open (A) | 4 | 2025-09-07 | S | B | 0 | 0.17 | -0.17 | -3.2 | 0.18 | -0.18 | -3.6 |
| 1917.5 | 1938.9 | 20 | 20 | Jacobs, CN (Calvin Nicholas) | | GTP | 1967 | 1979.3 | Lubowski Open 2025 (A) | 4 | 2025-03-22 | S | B | 0 | 0.4 | -0.4 | -7.5 | 0.41 | -0.41 | -8.2 |
| 1907.7 | 1923.9 | 20 | 20 | Jacobs, CN (Calvin Nicholas) | | GTP | 1961.6 | 1966.5 | 2025 Piet Robbertse Fide Rated Open Chess Tournament (A) | 1 | 2025-02-01 | S | B | 0 | 0.4 | -0.4 | -7.5 | 0.41 | -0.41 | -8.2 |
| 1899.6 | 1917.4 | 20 | 20 | Jacobs, CN (Calvin Nicholas) | | GTP | 1978.3 | 1987.9 | 2025 Tshwane Chess OPEN Registration Tournament (A2) | 3 | 2025-01-25 | S | B | 1 | 0.37 | 0.63 | 10.5 | 0.38 | 0.62 | 12.4 |
| 1874.3 | 1883.8 | 20 | 20 | Jacobs, CN (Calvin Nicholas) | | GTP | 1914.1 | 1929.8 | JCC Khelo India 1st Annual Chess Tournament 2024 (Pestige) | 2 | 2024-08-31 | S | W | 0.5 | 0.5 | 0 | 0 | 0.49 | 0.01 | 0.2 |
| 1885.5 | 1913.6 | 20 | 20 | Jacobs, CN (Calvin Nicholas) | | GTP | 1727.9 | 1732.8 | South African Junior Closed Chess Championship 2024 (U16 Open) | 9 | 2024-05-01 | S | W | 0.5 | 0.73 | -0.23 | -4.6 | 0.75 | -0.25 | -5 |
| 1787.4 | 1778 | 20 | 20 | Jacobs, CN (Calvin Nicholas) | | GTP | 1680.3 | 1689.7 | 2023 Lubowski Open Tournament (A) | 5 | 2023-06-25 | S | B | 0 | 0.58 | -0.58 | -10.9 | 0.56 | -0.56 | -11.2 |
| 1783.9 | 1791.9 | 20 | 20 | Jacobs, CN (Calvin Nicholas) | | GTP | 1696.2 | 1713.7 | 2023 Piet Robbertse Fide Rated Open Chess Tournament (A) | 2 | 2023-02-04 | S | B | 0 | 0.56 | -0.56 | -10.5 | 0.55 | -0.55 | -11 |
| 1680.1 | 1681.6 | 20 | 20 | Jacobs, CN (Calvin Nicholas) | | GTP | 1661.9 | 1659.9 | 2022 Etienne Lewis (U14 Open) | 5 | 2022-09-04 | S | W | 1 | 0.56 | 0.44 | 8.3 | 0.57 | 0.43 | 8.6 |
| 1638.6 | 1669 | 20 | 20 | Jacobs, CN (Calvin Nicholas) | | GTP | 1689.7 | 1681.5 | 2022 Centurion Club Championships | 4 | 2022-06-01 | S | W | 0 | 0.48 | -0.48 | -8 | 0.53 | -0.53 | -10.6 |
| 1519.9 | 1510.7 | 20 | 20 | Jacobs, CN (Calvin Nicholas) | | GTP | 1570.4 | 1571.3 | 2021 Milos Ristic Open (A) | 5 | 2021-10-09 | S | W | 1 | 0.48 | 0.52 | 8.6 | 0.47 | 0.53 | 10.6 |
| 1562.8 | 1561.9 | 20 | 20 | Jacobs, CN (Calvin Nicholas) | | GTP | 1507.5 | 1504.9 | 2021 Gauteng North Open Tournament (A) | 3 | 2021-08-28 | S | B | 1 | 0.52 | 0.48 | 9 | 0.52 | 0.48 | 9.6 |
| 1495.1 | 1492.1 | 20 | 20 | Jacobs, CN (Calvin Nicholas) | | GTP | 1488.8 | 1487.7 | 2019 Etienne Lewis Trials (U12 Boys) | 4 | 2019-08-31 | S | W | 0.5 | 0.55 | -0.05 | -1 | 0.55 | -0.05 | -1 |
| 1430.6 | 1426.1 | 20 | 20 | Jacobs, CN (Calvin Nicholas) | | GTP | 1419.3 | 1418.2 | 2019 Swartkop Open (B) | 2 | 2019-06-15 | S | W | 0 | 0.55 | -0.55 | -9.1 | 0.55 | -0.55 | -11 |
| 1269.8 | 1255.9 | 20 | 20 | Jacobs, CN (Calvin Nicholas) | | GTP | 1291.5 | 1290.2 | 2018 Gauteng North Open (B) | 4 | 2018-10-21 | S | B | 1 | 0.43 | 0.57 | 10.7 | 0.42 | 0.58 | 11.6 |
| 1296.3 | 1291.9 | 20 | 20 | Jacobs, CN (Calvin Nicholas) | | GTP | 1176.7 | 1172.2 | 2018 Etienne Lewis Trials (U10 Boys) | 6 | 2018-09-02 | S | B | 0 | 0.6 | -0.6 | -12 | 0.6 | -0.6 | -12 |
| 1049.5 | 1051.4 | 20 | 20 | Jacobs, CN (Calvin Nicholas) | | GTP | 1022.5 | 1025.6 | 2018 Swartkop Open (C) | 5 | 2018-06-23 | S | W | 0.5 | 0.57 | -0.07 | -1.2 | 0.57 | -0.07 | -1.4 |
