| 2331.8 | 2353.5 | 12 | 12 | Klaasen, CJ (Calvin John) | FM | WCT | 2201.5 | 2227.4 | 2026 South African Closed Chess Championships (Open) | 5 | 2026-02-23 | S | W | 0.5 | 0.69 | -0.19 | -2.3 | 0.69 | -0.19 | -2.3 |
| 2336.5 | 2359 | 20 | 20 | Klaasen, CJ (Calvin) | FM | WCT | 2204.8 | 2230.1 | South African Closed Chess Championship 2024 (Open) | 6 | 2024-03-29 | S | B | 0.5 | 0.61 | -0.11 | -2.2 | 0.61 | -0.11 | -2.2 |
| 2353.2 | 2379.8 | 20 | 20 | Klaasen, CJ (Calvin) | FM | WCT | 2187.7 | 2197.2 | Cape Town Masters Challenge 2023 (IM Norm) | 6 | 2023-01-06 | S | B | 0.5 | 0.65 | -0.15 | -3 | 0.67 | -0.17 | -3.4 |
| 2402.1 | 2412.7 | 20 | 20 | Klaasen, CJ (Calvin) | FM | WCT | 2211.5 | 2221.3 | South African Open 2022 (Championship) | 7 | 2022-07-13 | S | W | 1 | 0.76 | 0.24 | 4.8 | 0.76 | 0.24 | 4.8 |
| 2404.7 | 2415.7 | 20 | 20 | Klaasen, CJ (Calvin) | FM | WCT | 2226.7 | 2237.9 | 2022 South African Closed Chess Championships (Open) | 4 | 2022-05-09 | S | W | 1 | 0.75 | 0.25 | 5 | 0.75 | 0.25 | 5 |
| 2429.4 | 2432.1 | 20 | 20 | Klaasen, CJ (Calvin) | FM | WCT | 2247.9 | 2254.1 | 2019 Capablanca Chess Festival (RR IM Norm) | 4 | 2019-04-20 | S | B | 0.5 | 0.67 | -0.17 | -3.4 | 0.67 | -0.17 | -3.4 |
| 2443.2 | 2443.1 | 20 | 20 | Klaasen, CJ (Calvin) | FM | WCT | 2251.4 | 2253.6 | 2018 Capablanca RR (GM Norm) | 4 | 2018-04-28 | S | W | 0.5 | 0.77 | -0.27 | -5.4 | 0.76 | -0.26 | -5.2 |
| 2442.6 | 2442.6 | 20 | 20 | Klaasen, CJ (Calvin) | FM | WCT | 2255.4 | 2258.4 | 2018 Boardwalk Pearson Open (IM Norm) | 6 | 2018-03-15 | S | B | 0.5 | 0.68 | -0.18 | -3.6 | 0.67 | -0.17 | -3.4 |
| 2410 | 2410 | 20 | 20 | Klaasen, Cj (Calvin) | FM | WP | 2113 | 2113 | Sa Closed 2015 (Open A) | 7 | 2015-12-18 | S | B | 1 | 0.85 | 0.15 | 3 | 0.15 | 0.85 | 17 |
| 2368 | 2368 | 20 | 20 | Klaasen, Cj (Calvin) | | WP | 2124 | 2124 | South African Closed 2014 (Open A) | 3 | 2014-01-05 | S | W | 1 | 0.8 | 0.2 | 4 | 0.2 | 0.8 | 16 |
