| 2193.1 | 2211.1 | 20 | 20 | Klaasen, CJ (Calvin John) | FM | WCT | 2199.2 | 2226.3 | Cape Town Chess Federation Club League 2025 (A) | 9 | 2025-09-20 | S | B | 0.5 | 0.45 | 0.05 | 1 | 0.44 | 0.06 | 1.2 |
| 2197.9 | 2215.5 | 20 | 20 | Klaasen, CJ (Calvin John) | FM | WCT | 2199.7 | 2224.1 | Cape Gambit Invitational 2025 | 7 | 2025-04-21 | S | B | 0 | 0.46 | -0.46 | -9.2 | 0.45 | -0.45 | -9 |
| 2176.4 | 2169.8 | 20 | 20 | Klaasen, CJ (Calvin) | FM | WCT | 2187.7 | 2197.2 | Cape Town Masters Challenge 2023 (IM Norm) | 5 | 2023-01-06 | S | W | 0 | 0.53 | -0.53 | -10.6 | 0.51 | -0.51 | -10.2 |
| 2171.3 | 2151.2 | 20 | 20 | Klaasen, CJ (Calvin) | FM | WCT | 2228.6 | 2239.6 | 2019 South African Closed Chess Championships (Open A) | 1 | 2019-12-07 | S | W | 0.5 | 0.48 | 0.02 | 0.4 | 0.44 | 0.06 | 1.2 |
| 2163 | 2141.8 | 20 | 20 | Klaasen, CJ (Calvin) | FM | WCT | 2261.3 | 2273 | Cape of Good Hope Open 2019 (Elite) | 5 | 2019-01-27 | S | W | 0.5 | 0.43 | 0.07 | 1.2 | 0.39 | 0.11 | 2.2 |
| 2112 | 2112 | 20 | 20 | Klaasen, Cj (Calvin) | FM | WP | 2247 | 2247 | 2017 South African Closed Chess Championships (Open) | 4 | 2017-12-12 | S | W | 0 | 0.32 | -0.32 | -6.4 | -0.32 | 0.32 | 6.4 |
| 2122 | 2122 | 20 | 20 | Klaasen, Cj (Calvin) | FM | WP | 2218 | 2218 | 2017 Western Province League (Premier) | 4 | 2017-08-12 | S | W | 0.5 | 0.37 | 0.13 | 2.6 | 0.13 | 0.37 | 7.4 |
| 2121 | 2121 | 20 | 20 | Klaasen, Cj (Calvin) | FM | WP | 2188 | 2188 | Wp Open 2017 (Elite) | 6 | 2017-03-05 | S | W | 0.5 | 0.41 | 0.09 | 1.7 | 0.09 | 0.41 | 8.2 |
| 2106 | 2106 | 20 | 20 | Klaasen, Cj (Calvin) | FM | WP | 2113 | 2113 | Sa Closed 2015 (Open A) | 2 | 2015-12-13 | S | W | 0.5 | 0.49 | 0.01 | 0.2 | 0.01 | 0.49 | 9.8 |
| 2124 | 2124 | 20 | 20 | Klaasen, Cj (Calvin) | FM | WP | 2113 | 2113 | Western Province League 2015 (Premier) | 4 | 2015-08-13 | S | W | 0.5 | 0.52 | -0.02 | -0.4 | -0.02 | 0.52 | 10.4 |
| 2123 | 2123 | 20 | 20 | Klaasen, Cj (Calvin) | FM | WP | 2138 | 2138 | Western Province League 2014 (Premier Division) | 2 | 2015-02-17 | S | B | 1 | 0.48 | 0.52 | 10.4 | 0.52 | 0.48 | 9.6 |
| 2093 | 2093 | 20 | 20 | Klaasen, Cj (Calvin) | FM | WP | 2147 | 2147 | Cape Of Good Hope Open Prestige Section | 4 | 2015-01-24 | S | B | 0 | 0.42 | -0.42 | -7 | -0.42 | 0.42 | 8.4 |
| 2051 | 2051 | 20 | 20 | Klaasen, Cj (Calvin) | | WP | 2150 | 2150 | Curro Open 2014 Elite Section | 3 | 2014-07-26 | S | B | 1 | 0.36 | 0.64 | 12.8 | 0.64 | 0.36 | 7.2 |
| 2037 | 2037 | 20 | 20 | Klaasen, Cj (Calvin) | | WP | 2124 | 2124 | South African Closed 2014 (Open A) | 11 | 2014-01-12 | S | B | 0.5 | 0.38 | 0.12 | 2.4 | 0.12 | 0.38 | 7.6 |
| 2021 | 2021 | 20 | 20 | Klaasen, Cj (Calvin) | NM | WP | 2151 | 2151 | South African Open Chess Championship 2012 (Open) | 5 | 2012-07-02 | S | W | 0 | 0.32 | -0.32 | -6.4 | -0.32 | 0.32 | 6.4 |
