| 1846.2 | 1856.1 | 20 | 20 | Jacobs, CN (Calvin Nicholas) | | GTP | 2168.5 | 2179.5 | Tshwane Chess Club Clash 2025 (Prestige) | 3 | 2025-09-13 | S | B | 0.5 | 0.08 | 0.42 | 7 | 0.08 | 0.42 | 8.4 |
| 1807.9 | 1809.7 | 20 | 20 | Jacobs, CN (Calvin Nicholas) | | GTP | 2144.1 | 2155.2 | 2025 Midstream Open Chess Tournament (A) | 4 | 2025-08-25 | S | B | 0 | 0.07 | -0.07 | -1.2 | 0.06 | -0.06 | -1.2 |
| 1881 | 1895.8 | 20 | 20 | Jacobs, CN (Calvin Nicholas) | | GTP | 1974.7 | 1988.1 | 2025 Mid Gauteng Open Chess Tournament (A) | 4 | 2025-04-12 | S | W | 0.5 | 0.43 | 0.07 | 1.2 | 0.43 | 0.07 | 1.4 |
| 1764.2 | 1763.6 | 20 | 20 | Jacobs, CN (Calvin Nicholas) | | GTP | 1967 | 1979.3 | 2025 Chris Greyling Open Chess Tournament (A) | 5 | 2025-03-15 | S | B | 0.5 | 0.22 | 0.28 | 4.6 | 0.21 | 0.29 | 5.8 |
| 1791.8 | 1776.1 | 20 | 20 | Jacobs, CN (Calvin Nicholas) | | GTP | 1961.6 | 1966.5 | 2025 Blou Bul Open Chess Tournament (A) | 2 | 2025-02-08 | S | W | 0.5 | 0.34 | 0.16 | 2.7 | 0.32 | 0.18 | 3.6 |
