| 2190.4 | 2213.9 | 20 | 20 | Klaasen, CJ (Calvin) | FM | WCT | 2247.9 | 2254.1 | Steinitz Chess Festival 2019 (A) | 5 | 2019-04-07 | S | W | 0 | 0.47 | -0.47 | -8.2 | 0.49 | -0.49 | -9.8 |
| 2208 | 2231.8 | 20 | 20 | Klaasen, CJ (Calvin) | FM | WCT | 2246.3 | 2239.7 | 2019 Cape Town Classic Chess Festival (Rapid) | 3 | 2019-03-30 | R | B | 0 | 0.41 | -0.41 | -3.9 | 0.45 | -0.45 | -9 |
| 2208 | 2266.4 | 20 | 20 | Klaasen, CJ (Calvin) | FM | WCT | 2246.3 | 2259.7 | 2019 Cape Town Classic Chess Festival (Blitz) | 5 | 2019-03-29 | B | W | 0 | 0.5 | -0.5 | -1.8 | 0.55 | -0.55 | -11 |
| 2214.4 | 2255 | 20 | 20 | Klaasen, CJ (Calvin) | FM | WCT | 2260.8 | 2241.3 | Graham Solomon Memorial 2018 (Blitz) | 7 | 2018-11-25 | B | W | 0 | 0.49 | -0.49 | -2.5 | 0.56 | -0.56 | -11.2 |
| 2252 | 2252 | 20 | 20 | Klaasen, CJ (Calvin) | FM | WCT | 2258.4 | 2258.4 | WP Team Blitz 2018 (A) | 7 | 2018-02-17 | B | B | 0 | 0.45 | -0.45 | -1.6 | 0.45 | -0.45 | -9 |
| 2088 | 2088 | 20 | 20 | Klaasen, Cj (Calvin) | FM | WP | 2247 | 2247 | 2017 South African Closed Chess Championships (Open) | 7 | 2017-12-15 | S | B | 0.5 | 0.29 | 0.21 | 4.2 | 0.21 | 0.29 | 5.8 |
| 2166 | 2166 | 20 | 20 | Klaasen, Cj (Calvin) | FM | WP | 2200 | 2200 | Cape Town Acl Tournament - Masters Section 2017 | 7 | 2017-07-11 | S | B | 0 | 0.45 | -0.45 | -9 | -0.45 | 0.45 | 9 |
| 2166 | 2166 | 20 | 20 | Klaasen, Cj (Calvin) | FM | WP | 2188 | 2188 | Cape Town Heritage Chess Festival 2017 (Elite) | 6 | 2017-03-26 | S | B | 0 | 0.47 | -0.47 | -9.4 | -0.47 | 0.47 | 9.4 |
| 2186 | 2186 | 20 | 20 | Klaasen, Cj (Calvin) | FM | WP | 2160 | 2160 | 2016 African Chess Lounge (Im Norm) | 3 | 2016-11-28 | S | B | 0.5 | 0.54 | -0.04 | -0.8 | -0.04 | 0.54 | 10.8 |
| 2110 | 2110 | 20 | 20 | Klaasen, Cj (Calvin) | FM | WP | 2135 | 2135 | Chess Wp Blitz Festival 2016 Team Blitz | 5 | 2016-10-29 | B | W | 0 | 0.47 | -0.47 | -1.7 | -0.47 | 0.47 | 9.4 |
| 2173 | 2173 | 20 | 20 | Klaasen, Cj (Calvin) | FM | WP | 2113 | 2113 | Sa Closed 2015 (Open A) | 3 | 2015-12-14 | S | B | 0 | 0.58 | -0.58 | -11.6 | -0.58 | 0.58 | 11.6 |
| 2133 | 2133 | 20 | 20 | Klaasen, Cj (Calvin) | FM | WP | 2116 | 2116 | Steinitz Chess Festival 2015 (Elite) | 2 | 2015-09-24 | S | B | 1 | 0.52 | 0.48 | 9.6 | 0.48 | 0.52 | 10.4 |
| 2175 | 2175 | 20 | 20 | Klaasen, Cj (Calvin) | FM | WP | 2065 | 2065 | Wp Rapid Chess Championships (Open) | 5 | 2015-05-23 | R | B | 0 | 0.65 | -0.65 | -4.3 | -0.65 | 0.65 | 13 |
| 2146 | 2146 | 20 | 20 | Klaasen, Cj (Calvin) | FM | WP | 2138 | 2138 | Western Province League 2014 (Premier Division) | 1 | 2015-02-17 | S | W | 1 | 0.51 | 0.49 | 9.8 | 0.49 | 0.51 | 10.2 |
| 2161 | 2161 | 20 | 20 | Klaasen, Cj (Calvin) | FM | WP | 2147 | 2147 | Cape Of Good Hope Open Prestige Section | 6 | 2015-01-25 | S | W | 0.5 | 0.52 | -0.02 | -0.3 | -0.02 | 0.52 | 10.4 |
| 2153 | 2153 | 20 | 20 | Klaasen, Cj (Calvin) | | WP | 2124 | 2124 | Ample Sport Club Team Championship 2014 | 4 | 2014-03-22 | S | W | 0.5 | 0.54 | -0.04 | -0.8 | -0.04 | 0.54 | 10.8 |
| 2149 | 2149 | 20 | 20 | Klaasen, Cj (Calvin) | | WP | 2124 | 2124 | South African Closed 2014 (Open A) | 9 | 2014-01-11 | S | B | 0.5 | 0.53 | -0.03 | -0.6 | -0.03 | 0.53 | 10.6 |
| 2166 | 2166 | 20 | 20 | Klaasen, Cj (Calvin) | | WP | 2123 | 2123 | Western Province Team Blitz Championship 2013 | 5 | 2013-11-28 | B | W | 1 | 0.56 | 0.44 | 1.6 | 0.44 | 0.56 | 11.2 |
| 2166 | 2166 | 20 | 20 | Klaasen, Cj (Calvin) | | WP | 2123 | 2123 | Western Province Individual Blitz Championship2013 | 8 | 2013-11-21 | B | W | 1 | 0.56 | 0.44 | 1.6 | 0.44 | 0.56 | 11.2 |
| 2134 | 2134 | 20 | 20 | Klaasen, Cj (Calvin) | NM | WP | 2142 | 2142 | Western Province Open 2013 Premier Section | 3 | 2013-03-10 | S | B | 0 | 0.49 | -0.49 | -9.8 | -0.49 | 0.49 | 9.8 |
