| 2094.3 | 2183.1 | 20 | 20 | Klaasen, CJ (Calvin) | FM | WCT | 2204.8 | 2192.4 | Hermanus Chess Club Open 2024 (Championship) | 3 | 2024-04-20 | R | W | 1 | 0.41 | 0.59 | 5.5 | 0.53 | 0.47 | 9.4 |
| 2048.8 | 2062 | 20 | 20 | Klaasen, CJ (Calvin) | FM | WCT | 2162.9 | 2188.5 | 2023 Moja Chess Extravaganza (Prestige) | 6 | 2023-10-02 | S | W | 0.5 | 0.41 | 0.09 | 1.8 | 0.39 | 0.11 | 2.2 |
| 2094.2 | 2105.7 | 20 | 20 | Klaasen, CJ (Calvin) | FM | WCT | 2189.1 | 2197.8 | Western Cape Club Championship 2022 (Tier 1) | 4 | 2022-10-08 | S | B | 0 | 0.35 | -0.35 | -6 | 0.35 | -0.35 | -7 |
| 2164 | 2244 | 20 | 20 | Klaasen, CJ (Calvin) | FM | WCT | 2253 | 2245.8 | Stellenberg Youth Chess Championship 2019 (Presige) | 2 | 2019-05-01 | R | W | 0 | 0.44 | -0.44 | -5.3 | 0.54 | -0.54 | -10.8 |
| 2211.4 | 2223.3 | 20 | 20 | Klaasen, CJ (Calvin) | FM | WCT | 2231.2 | 2231.6 | 2018 Western Province League (Premier) | 11 | 2018-09-15 | S | B | 0 | 0.44 | -0.44 | -8.8 | 0.45 | -0.45 | -9 |
| 2259.4 | 2259.4 | 20 | 20 | Klaasen, CJ (Calvin) | FM | WCT | 2258.4 | 2258.4 | WP Team Blitz 2018 (A) | 5 | 2018-02-17 | B | B | 0 | 0.46 | -0.46 | -1.7 | 0.46 | -0.46 | -9.2 |
| 2109 | 2109 | 20 | 20 | Klaasen, Cj (Calvin) | FM | WP | 2218 | 2218 | 2017 National Club Championships (A) | 6 | 2017-09-25 | S | W | 0.5 | 0.35 | 0.15 | 3 | 0.15 | 0.35 | 7 |
| 2109 | 2109 | 20 | 20 | Klaasen, Cj (Calvin) | FM | WP | 2218 | 2218 | 2017 Western Province League (Premier) | 9 | 2017-09-07 | S | W | 0 | 0.35 | -0.35 | -7 | -0.35 | 0.35 | 7 |
| 2100 | 2100 | 20 | 20 | Klaasen, Cj (Calvin) | FM | WP | 2197 | 2197 | Steinitz Chess Festival 2017 (Elite) | 5 | 2017-04-16 | S | B | 0.5 | 0.37 | 0.13 | 2.6 | 0.13 | 0.37 | 7.4 |
| 2100 | 2100 | 20 | 20 | Klaasen, Cj (Calvin) | FM | WP | 2188 | 2188 | Wp Open 2017 (Elite) | 3 | 2017-03-04 | S | B | 0 | 0.38 | -0.38 | -7.1 | -0.38 | 0.38 | 7.6 |
| 2110 | 2110 | 20 | 20 | Klaasen, Cj (Calvin) | FM | WP | 2162 | 2162 | Western Province League 2016 (A) | 11 | 2016-10-01 | S | B | 0 | 0.43 | -0.43 | -8.6 | -0.43 | 0.43 | 8.6 |
| 2138 | 2138 | 20 | 20 | Klaasen, Cj (Calvin) | FM | WP | 2135 | 2135 | Chess Wp Blitz Festival 2016 Team Blitz | 4 | 2016-10-29 | B | B | 0.5 | 0.5 | 0 | 0 | 0 | 0.5 | 10 |
| 2152 | 2152 | 20 | 20 | Klaasen, Cj (Calvin) | FM | WP | 2113 | 2113 | Sa Closed 2015 (Open A) | 9 | 2015-12-20 | S | W | 0 | 0.55 | -0.55 | -11 | -0.55 | 0.55 | 11 |
| 2161 | 2161 | 20 | 20 | Klaasen, Cj (Calvin) | FM | WP | 2116 | 2116 | Steinitz Chess Festival 2015 (Elite) | 3 | 2015-09-25 | S | W | 1 | 0.56 | 0.44 | 8.8 | 0.44 | 0.56 | 11.2 |
| 2092 | 2092 | 20 | 20 | Klaasen, Cj (Calvin) | NM | WP | 2142 | 2142 | Western Province Open 2013 Premier Section | 7 | 2013-03-17 | S | B | 0.5 | 0.43 | 0.07 | 1.4 | 0.07 | 0.43 | 8.6 |
