| 2032.7 | 2058.8 | 20 | 20 | Klaasen, CJ (Calvin) | FM | WCT | 2198.3 | 2229.8 | Nelson Mandela Rapid 2020 (Open) | 4 | 2020-02-01 | R | W | 1 | 0.35 | 0.65 | 7.4 | 0.34 | 0.66 | 13.2 |
| 2032.7 | 2035.4 | 20 | 20 | Klaasen, CJ (Calvin) | FM | WCT | 2198.3 | 2212.4 | 2020 Cape Of Good Hope Open (Elite) | 3 | 2020-02-22 | S | B | 0.5 | 0.27 | 0.23 | 4 | 0.25 | 0.25 | 5 |
| 2002.3 | 2006 | 20 | 20 | Klaasen, CJ (Calvin) | FM | WCT | 2228.6 | 2239.6 | 2019 South African Closed Chess Championships (Open A) | 10 | 2019-12-16 | S | W | 0 | 0.28 | -0.28 | -5.6 | 0.27 | -0.27 | -5.4 |
| 2051.6 | 2055 | 20 | 20 | Klaasen, CJ (Calvin) | FM | WCT | 2243.8 | 2255.8 | 2019 National Club Chess Championships (A) | 4 | 2019-09-28 | S | W | 0 | 0.32 | -0.32 | -6.4 | 0.31 | -0.31 | -6.2 |
| 2058.1 | 2049.2 | 20 | 20 | Klaasen, CJ (Calvin) | FM | WCT | 2253 | 2257 | 2019 Western Province Open (Elite) | 4 | 2019-05-26 | S | W | 0 | 0.31 | -0.31 | -5.4 | 0.3 | -0.3 | -6 |
| 2081 | 2066.2 | 20 | 20 | Klaasen, CJ (Calvin) | FM | WCT | 2247.9 | 2254.1 | Steinitz Chess Festival 2019 (A) | 6 | 2019-04-07 | S | B | 0 | 0.26 | -0.26 | -4.5 | 0.24 | -0.24 | -4.8 |
| 2089.9 | 2105.8 | 20 | 20 | Klaasen, CJ (Calvin) | FM | WCT | 2246.3 | 2239.7 | 2019 Cape Town Classic Chess Festival (Rapid) | 4 | 2019-03-30 | R | W | 0 | 0.36 | -0.36 | -3.4 | 0.39 | -0.39 | -7.8 |
| 2089.9 | 2038 | 20 | 20 | Klaasen, CJ (Calvin) | FM | WCT | 2246.3 | 2259.7 | 2019 Cape Town Classic Chess Festival (Blitz) | 6 | 2019-03-29 | B | B | 1 | 0.28 | 0.72 | 2.6 | 0.2 | 0.8 | 16 |
| 2066.5 | 2036 | 20 | 20 | Klaasen, CJ (Calvin) | FM | WCT | 2261.3 | 2273 | Cape of Good Hope Open 2019 (Elite) | 2 | 2019-01-26 | S | B | 0.5 | 0.23 | 0.27 | 4.7 | 0.18 | 0.32 | 6.4 |
| 2058.8 | 2036.4 | 20 | 20 | Klaasen, CJ (Calvin) | FM | WCT | 2248.2 | 2253.1 | South African Junior Blitz 2018 (Open) | 6 | 2018-12-19 | B | B | 0 | 0.24 | -0.24 | -0.9 | 0.21 | -0.21 | -4.2 |
| 2045.5 | 2070 | 20 | 20 | Klaasen, CJ (Calvin) | FM | WCT | 2260.8 | 2260.8 | Graham Solomon Memorial 2018 (Rapid) | 5 | 2018-11-24 | R | W | 1 | 0.29 | 0.71 | 8.5 | 0.32 | 0.68 | 13.6 |
| 2029 | 2040.6 | 20 | 20 | Klaasen, CJ (Calvin) | FM | WCT | 2258.4 | 2258.4 | WP Team Blitz 2018 (A) | 3 | 2018-02-17 | B | B | 0.5 | 0.19 | 0.31 | 1.1 | 0.2 | 0.3 | 6 |
| 1943 | 1943 | 20 | 20 | Klaasen, Cj (Calvin) | FM | WP | 2188 | 2188 | Wp Open 2017 (Elite) | 4 | 2017-03-04 | S | W | 0.5 | 0.2 | 0.3 | 5.6 | 0.3 | 0.2 | 4 |
| 2031 | 2031 | 20 | 20 | Klaasen, Cj (Calvin) | FM | WP | 2168 | 2168 | South African Inter Region Championship 2015 | 7 | 2016-01-10 | S | W | 0 | 0.32 | -0.32 | -6 | -0.32 | 0.32 | 6.4 |
| 2024 | 2024 | 20 | 20 | Klaasen, Cj (Calvin) | FM | WP | 2113 | 2113 | Sa Closed 2015 (Open A) | 11 | 2015-12-22 | S | W | 0 | 0.38 | -0.38 | -7.6 | -0.38 | 0.38 | 7.6 |
| 1997 | 1997 | 20 | 20 | Klaasen, Cj (Calvin) | FM | WP | 2138 | 2138 | Western Province League 2014 (Premier Division) | 3 | 2015-02-17 | S | W | 0 | 0.31 | -0.31 | -6.2 | -0.31 | 0.31 | 6.2 |
| 1940 | 1940 | 20 | 20 | Klaasen, Cj (Calvin) | FM | WP | 2157 | 2157 | Western Province Team Blitz Championship 2015 | 5 | 2015-01-31 | B | W | 1 | 0.22 | 0.78 | 2.8 | 0.78 | 0.22 | 4.4 |
| 1985 | 1985 | 20 | 20 | Klaasen, Cj (Calvin) | | WP | 2120 | 2120 | Steinitz Open 2014 (Prestige A) | 2 | 2014-05-10 | S | B | 0.5 | 0.32 | 0.18 | 3.6 | 0.18 | 0.32 | 6.4 |
| 1972 | 1972 | 20 | 20 | Klaasen, Cj (Calvin) | | WP | 2124 | 2124 | Western Province Open 2014 Prestige Section | 4 | 2014-03-08 | S | W | 0.5 | 0.3 | 0.2 | 3.5 | 0.2 | 0.3 | 6 |
| 1879 | 1879 | 20 | 20 | Klaasen, Cj (Calvin) | | WP | 2096 | 2096 | Chess For All (Senior) | 4 | 2014-02-15 | R | W | 1 | 0.22 | 0.78 | 6.1 | 0.78 | 0.22 | 4.4 |
| 1892 | 1892 | 20 | 20 | Klaasen, Cj (Calvin) | | WP | 2123 | 2123 | Western Province Individual Blitz Championship2013 | 9 | 2013-11-21 | B | B | 0 | 0.21 | -0.21 | -0.8 | -0.21 | 0.21 | 4.2 |
| 1932 | 1932 | 20 | 20 | Klaasen, Cj (Calvin) | NM | WP | 2143 | 2143 | Cape Of Good Hope Open 2013 (Open Section) | 5 | 2013-01-27 | S | W | 0.5 | 0.23 | 0.27 | 5.1 | 0.27 | 0.23 | 4.6 |
