| 2045.8 | 2046.7 | 20 | 20 | Klaasen, CJ (Calvin) | FM | WCT | 2228.6 | 2239.6 | 2019 South African Closed Chess Championships (Open A) | 8 | 2019-12-14 | S | W | 1 | 0.33 | 0.67 | 13.4 | 0.32 | 0.68 | 13.6 |
| 2080 | 2079.7 | 20 | 20 | Klaasen, CJ (Calvin) | FM | WCT | 2243.8 | 2255.8 | 2019 Western Province League (Premier) | 2 | 2019-07-27 | S | B | 0 | 0.27 | -0.27 | -5.4 | 0.25 | -0.25 | -5 |
| 2072.1 | 1898.5 | 20 | 20 | Klaasen, CJ (Calvin) | FM | WCT | 2253 | 2245.8 | Stellenberg Youth Chess Championship 2019 (Presige) | 5 | 2019-05-01 | R | B | 1 | 0.25 | 0.75 | 9 | 0.05 | 0.95 | 19 |
| 2034.2 | 2035.5 | 20 | 20 | Klaasen, CJ (Calvin) | FM | WCT | 2261.3 | 2273 | Cape of Good Hope Open 2019 (Elite) | 6 | 2019-01-27 | S | B | 0.5 | 0.19 | 0.31 | 5.4 | 0.18 | 0.32 | 6.4 |
| 1959.1 | 1967.8 | 20 | 20 | Klaasen, CJ (Calvin) | FM | WCT | 2231.2 | 2231.6 | 2018 Western Province League (Premier) | 9 | 2018-09-08 | S | B | 0.5 | 0.14 | 0.36 | 7.2 | 0.15 | 0.35 | 7 |
| 1931 | 1931 | 20 | 20 | Klaasen, Cj (Calvin) | FM | WP | 2200 | 2200 | Cape Town Acl Tournament - Masters Section 2017 | 1 | 2017-06-30 | S | W | 0 | 0.17 | -0.17 | -3.4 | -0.17 | 0.17 | 3.4 |
| 1912 | 1912 | 20 | 20 | Klaasen, Cj (Calvin) | FM | WP | 2188 | 2188 | Cape Town Heritage Chess Festival 2017 (Elite) | 7 | 2017-03-26 | S | W | 0.5 | 0.17 | 0.33 | 6.6 | 0.33 | 0.17 | 3.4 |
| 1725 | 1725 | 20 | 20 | Klaasen, Cj (Calvin) | FM | WP | 2161 | 2161 | Chess Wp Individual Blitz 2016 | 3 | 2016-04-16 | B | W | 0 | 0.06 | -0.06 | -0.2 | -0.06 | 0.06 | 1.2 |
| 1720 | 1720 | 20 | 20 | Klaasen, Cj (Calvin) | FM | WP | 2113 | 2113 | Wp Closed 2015 (A) | 5 | 2015-11-22 | S | W | 0 | 0.08 | -0.08 | -1.4 | -0.08 | 0.08 | 1.6 |
| 1744 | 1744 | 20 | 20 | Klaasen, Cj (Calvin) | | WP | 2125 | 2125 | Western Province Closed 2014 (A) | 1 | 2014-11-07 | S | B | 0 | 0.09 | -0.09 | -1.7 | -0.09 | 0.09 | 1.8 |
| 1675 | 1675 | 20 | 20 | Klaasen, Cj (Calvin) | | WP | 2150 | 2150 | Curro Open 2014 Elite Section | 4 | 2014-07-26 | S | W | 0.5 | 0.05 | 0.45 | 9 | 0.45 | 0.05 | 1 |
