Calvin John Klaasen
Country
RSA
Birth Year
1987
Gender
M
Title
FT,FIDE Master
FIDE ID
14300133
FIDE Rating
2190
FIDE Rating Graph
Games
| # | Date | Event | Site | Round | White | Black | Result | Moves | View |
|---|---|---|---|---|---|---|---|---|---|
| 1 | 2025-07-29 | Titled Tue 29th Jul Late | chess.com INT | 9 | Calvin John Klaasen | Stepan Papacek | 1/2-1/2 | 39 | Open |
| 2 | 2025-07-29 | Titled Tue 29th Jul Late | chess.com INT | 8 | Gisela Roque Sola | Calvin John Klaasen | 0-1 | 25 | Open |
| 3 | 2025-07-29 | Titled Tue 29th Jul Late | chess.com INT | 7 | Calvin John Klaasen | Casper Liu | 0-1 | 52 | Open |
| 4 | 2025-07-29 | Titled Tue 29th Jul Late | chess.com INT | 6 | Jaan Ehlvest | Calvin John Klaasen | 1-0 | 28 | Open |
| 5 | 2025-07-29 | Titled Tue 29th Jul Late | chess.com INT | 5 | Calvin John Klaasen | Marcel Winkels | 0-1 | 33 | Open |
| 6 | 2025-07-29 | Titled Tue 29th Jul Late | chess.com INT | 4 | Rudolf Jun | Calvin John Klaasen | 1-0 | 35 | Open |
| 7 | 2025-07-29 | Titled Tue 29th Jul Late | chess.com INT | 3 | Calvin John Klaasen | Sandi Stojanovski | 0-1 | 38 | Open |
| 8 | 2025-07-29 | Titled Tue 29th Jul Late | chess.com INT | 2 | Esteban Horacio Deichmann | Calvin John Klaasen | 1-0 | 38 | Open |
| 9 | 2025-07-29 | Titled Tue 29th Jul Late | chess.com INT | 1 | Alexandr E. Volodin | Calvin John Klaasen | 1-0 | 37 | Open |
| 10 | 2025-07-29 | Titled Tue 29th Jul Late | chess.com INT | 11 | Eleni Pica | Calvin John Klaasen | 0-1 | 18 | Open |
| 11 | 2025-07-29 | Titled Tue 29th Jul Late | chess.com INT | 10 | Calvin John Klaasen | Korun Gulamirian | 1-0 | 39 | Open |
| 12 | 2025-04-21 | Cape Gambit Inv 2025 | Cape Town RSA | 7.2 | Calvin John Klaasen | Mohamed Ozayr Bhawoodien | 1-0 | 35 | Open |
| 13 | 2025-04-20 | Cape Gambit Inv 2025 | Cape Town RSA | 6.2 | Matfey Rogov | Calvin John Klaasen | 1-0 | 31 | Open |
| 14 | 2025-04-20 | Cape Gambit Inv 2025 | Cape Town RSA | 5.3 | Calvin John Klaasen | Charlton Mnyasta | 1/2-1/2 | 62 | Open |
| 15 | 2025-04-19 | Cape Gambit Inv 2025 | Cape Town RSA | 4.1 | Colomban Vitoux | Calvin John Klaasen | 1-0 | 77 | Open |
| 16 | 2025-04-19 | Cape Gambit Inv 2025 | Cape Town RSA | 3.4 | Jan Karsten | Calvin John Klaasen | 1-0 | 50 | Open |
| 17 | 2025-04-18 | Cape Gambit Inv 2025 | Cape Town RSA | 2.2 | Calvin John Klaasen | Banele Mhango | 1-0 | 46 | Open |
| 18 | 2025-04-18 | Cape Gambit Inv 2025 | Cape Town RSA | 1.3 | Watu Kobese | Calvin John Klaasen | 1/2-1/2 | 57 | Open |
| 19 | 2025-01-08 | Cape Town Masters 2025 | Cape Town RSA | 4.4 | Ethan Samuels | Calvin John Klaasen | 0-1 | 53 | Open |
| 20 | 2025-01-07 | Cape Town Masters 2025 | Cape Town RSA | 3.4 | Calvin John Klaasen | Andre Schutte | 1/2-1/2 | 52 | Open |
| 21 | 2025-01-06 | Cape Town Masters 2025 | Cape Town RSA | 2.6 | Calvin John Klaasen | Eugene Milford | 1-0 | 3 | Open |
| 22 | 2025-01-06 | Cape Town Masters 2025 | Cape Town RSA | 1.7 | Minenhle Junior Mncwabe | Calvin John Klaasen | 0-1 | 53 | Open |
| 23 | 2024-12-17 | Titled Tue 17th Dec Early | chess.com INT | 8 | Calvin John Klaasen | Erick Marvin Guevara Sanchez | 1-0 | 66 | Open |
| 24 | 2024-12-17 | Titled Tue 17th Dec Early | chess.com INT | 7 | Maxim Novik | Calvin John Klaasen | 1-0 | 36 | Open |
| 25 | 2024-12-17 | Titled Tue 17th Dec Early | chess.com INT | 6 | Calvin John Klaasen | Luca Silva | 0-1 | 35 | Open |
| 26 | 2024-12-17 | Titled Tue 17th Dec Early | chess.com INT | 5 | Calvin John Klaasen | Mike Sailer | 1-0 | 38 | Open |
| 27 | 2024-12-17 | Titled Tue 17th Dec Early | chess.com INT | 4 | Joshuaede Cappelletto | Calvin John Klaasen | 1-0 | 21 | Open |
| 28 | 2024-12-17 | Titled Tue 17th Dec Early | chess.com INT | 3 | Calvin John Klaasen | Eduardo da Costa Marra | 0-1 | 31 | Open |
| 29 | 2024-12-17 | Titled Tue 17th Dec Early | chess.com INT | 2 | Nikita Shandrygin | Calvin John Klaasen | 1-0 | 36 | Open |
| 30 | 2024-12-17 | Titled Tue 17th Dec Early | chess.com INT | 1 | Aaditya Dhingra | Calvin John Klaasen | 0-1 | 86 | Open |
| 31 | 2024-04-02 | ch-RSA 2024 | Cape Town RSA | 11.6 | Jan Karsten | Calvin John Klaasen | 1-0 | 36 | Open |
| 32 | 2024-04-01 | ch-RSA 2024 | Cape Town RSA | 10.2 | Calvin John Klaasen | Jacob Dumisani Mnguni | 1/2-1/2 | 17 | Open |
| 33 | 2024-03-31 | ch-RSA 2024 | Cape Town RSA | 9.5 | Daniel Barrish | Calvin John Klaasen | 1/2-1/2 | 22 | Open |
| 34 | 2024-03-31 | ch-RSA 2024 | Cape Town RSA | 8.3 | Calvin John Klaasen | Caleb Levi Levitan | 1/2-1/2 | 15 | Open |
| 35 | 2024-03-30 | ch-RSA 2024 | Cape Town RSA | 7.4 | Watu Kobese | Calvin John Klaasen | 1/2-1/2 | 29 | Open |
| 36 | 2024-03-29 | ch-RSA 2024 | Cape Town RSA | 6.4 | Calvin John Klaasen | Daniel Cawdery | 1/2-1/2 | 17 | Open |
| 37 | 2024-03-29 | ch-RSA 2024 | Cape Town RSA | 5.3 | Lutho Mfazwe | Calvin John Klaasen | 0-1 | 41 | Open |
| 38 | 2024-03-28 | ch-RSA 2024 | Cape Town RSA | 4.5 | Calvin John Klaasen | Banele Mhango | 1/2-1/2 | 44 | Open |
| 39 | 2024-03-27 | ch-RSA 2024 | Cape Town RSA | 3.2 | Keith Khumalo | Calvin John Klaasen | 1/2-1/2 | 55 | Open |
| 40 | 2024-03-26 | ch-RSA 2024 | Cape Town RSA | 2.6 | Calvin John Klaasen | Charlton Mnyasta | 0-1 | 38 | Open |
| 41 | 2024-03-25 | ch-RSA 2024 | Cape Town RSA | 1.1 | Calvin John Klaasen | Michael Simpson | 1-0 | 45 | Open |
| 42 | 2024-01-07 | Cape Town Masters 2024 | Cape Town RSA | 9.3 | Watu Kobese | Calvin John Klaasen | 1/2-1/2 | 56 | Open |
| 43 | 2024-01-06 | Cape Town Masters 2024 | Cape Town RSA | 8.3 | Calvin John Klaasen | Charlton Mnyasta | 1-0 | 38 | Open |
| 44 | 2024-01-06 | Cape Town Masters 2024 | Cape Town RSA | 7.3 | Matfey Rogov | Calvin John Klaasen | 1/2-1/2 | 43 | Open |
| 45 | 2024-01-05 | Cape Town Masters 2024 | Cape Town RSA | 6.4 | Calvin John Klaasen | Edward Potgieter | 1/2-1/2 | 53 | Open |
| 46 | 2024-01-05 | Cape Town Masters 2024 | Cape Town RSA | 5.5 | Reegan Palmer | Calvin John Klaasen | 0-1 | 39 | Open |
| 47 | 2024-01-04 | Cape Town Masters 2024 | Cape Town RSA | 4.4 | Calvin John Klaasen | Tezihano Mnyasta | 1/2-1/2 | 34 | Open |
| 48 | 2023-12-26 | Titled Tue 26th Dec Early | chess.com INT | 8 | Calvin John Klaasen | Eric Dominguez Pons | 0-1 | 39 | Open |
| 49 | 2023-12-26 | Titled Tue 26th Dec Early | chess.com INT | 7 | Calvin John Klaasen | Chanchal Kumer Ghosh | 1-0 | 42 | Open |
| 50 | 2023-12-26 | Titled Tue 26th Dec Early | chess.com INT | 6 | Matfey Yurasov | Calvin John Klaasen | 1-0 | 41 | Open |
| 51 | 2023-12-26 | Titled Tue 26th Dec Early | chess.com INT | 5 | Mauricio Vargas Benavides | Calvin John Klaasen | 0-1 | 34 | Open |
| 52 | 2023-12-26 | Titled Tue 26th Dec Early | chess.com INT | 4 | Calvin John Klaasen | Vasilii Titarov | 0-1 | 21 | Open |
| 53 | 2023-12-26 | Titled Tue 26th Dec Early | chess.com INT | 3 | Calvin John Klaasen | Gizem Olcayoz | 1-0 | 25 | Open |
| 54 | 2023-10-04 | Moja Open 2023 | Kimberley RSA | 9.4 | Tyler Nevin | Calvin John Klaasen | 1-0 | 13 | Open |
| 55 | 2023-10-03 | Moja Open 2023 | Kimberley RSA | 7.6 | Calvin John Klaasen | Michael Simpson | 0-1 | 30 | Open |
| 56 | 2023-10-02 | Moja Open 2023 | Kimberley RSA | 6.5 | Lyndon Bouah | Calvin John Klaasen | 1/2-1/2 | 49 | Open |
| 57 | 2023-10-02 | Moja Open 2023 | Kimberley RSA | 5.2 | Calvin John Klaasen | Banele Mhango | 0-1 | 39 | Open |
| 58 | 2023-10-01 | Moja Open 2023 | Kimberley RSA | 4.3 | Watu Kobese | Calvin John Klaasen | 1/2-1/2 | 26 | Open |
| 59 | 2023-10-01 | Moja Open 2023 | Kimberley RSA | 3.4 | Calvin John Klaasen | James Dinham | 1-0 | 45 | Open |
| 60 | 2023-09-30 | Moja Open 2023 | Kimberley RSA | 2.5 | Karabo Teeke | Calvin John Klaasen | 0-1 | 59 | Open |
| 61 | 2023-06-11 | CKC Invitational Masters | Cape Town RSA | 5.1 | Jan Karsten | Calvin John Klaasen | 1/2-1/2 | 62 | Open |
| 62 | 2023-06-11 | CKC Invitational Masters | Cape Town RSA | 4.1 | Calvin John Klaasen | Matfey Rogov | 1-0 | 39 | Open |
| 63 | 2023-06-10 | CKC Invitational Masters | Cape Town RSA | 3.1 | Jan Boder | Calvin John Klaasen | 1/2-1/2 | 71 | Open |
| 64 | 2023-06-10 | CKC Invitational Masters | Cape Town RSA | 2.1 | Calvin John Klaasen | Daniel Barrish | 1/2-1/2 | 61 | Open |
| 65 | 2023-06-09 | CKC Invitational Masters | Cape Town RSA | 1.1 | Yovann Gatineau | Calvin John Klaasen | 1-0 | 38 | Open |
| 66 | 2023-05-13 | ch-Africa 2023 | Giza EGY | 9.9 | Calvin John Klaasen | Sameh Sadek | 1-0 | 38 | Open |
| 67 | 2023-05-12 | ch-Africa 2023 | Giza EGY | 8.9 | Khaled Abdel Razik | Calvin John Klaasen | 1-0 | 41 | Open |
| 68 | 2023-01-08 | Cape Town Masters IM 2023 | Cape Town RSA | 9.4 | Adham Fawzy | Calvin John Klaasen | 1-0 | 41 | Open |
| 69 | 2023-01-07 | Cape Town Masters IM 2023 | Cape Town RSA | 8.3 | Calvin John Klaasen | Reuben Salimu | 1-0 | 42 | Open |
| 70 | 2023-01-07 | Cape Town Masters IM 2023 | Cape Town RSA | 7.3 | Jan Karsten | Calvin John Klaasen | 0-1 | 63 | Open |
| 71 | 2023-01-06 | Cape Town Masters IM 2023 | Cape Town RSA | 6.4 | Calvin John Klaasen | Daniel Cawdery | 1/2-1/2 | 10 | Open |
| 72 | 2023-01-06 | Cape Town Masters IM 2023 | Cape Town RSA | 5.2 | Mohamed Ozayr Bhawoodien | Calvin John Klaasen | 0-1 | 26 | Open |
| 73 | 2023-01-05 | Cape Town Masters IM 2023 | Cape Town RSA | 4.5 | Calvin John Klaasen | Daniel Barrish | 0-1 | 52 | Open |
| 74 | 2023-01-05 | Cape Town Masters IM 2023 | Cape Town RSA | 3.5 | Calvin John Klaasen | Andrew Kayonde | 0-1 | 75 | Open |
| 75 | 2023-01-04 | Cape Town Masters IM 2023 | Cape Town RSA | 2.5 | Watu Kobese | Calvin John Klaasen | 1/2-1/2 | 19 | Open |
| 76 | 2023-01-04 | Cape Town Masters IM 2023 | Cape Town RSA | 1.2 | Calvin John Klaasen | Providence Oatlhotse | 0-1 | 58 | Open |
| 77 | 2022-07-17 | South African Open 2022 | Cape Town RSA | 11.1 | Calvin John Klaasen | Michael Simpson | 1-0 | 40 | Open |
| 78 | 2022-07-16 | South African Open 2022 | Cape Town RSA | 9.2 | Calvin John Klaasen | Dante M Beukes | 0-1 | 48 | Open |
| 79 | 2022-07-16 | South African Open 2022 | Cape Town RSA | 10.5 | Andreas de Jager | Calvin John Klaasen | 0-1 | 64 | Open |
| 80 | 2022-07-15 | South African Open 2022 | Cape Town RSA | 8.4 | Calvin John Klaasen | Kenneth Sean Willenberg | 1-0 | 21 | Open |
| 81 | 2022-07-13 | South African Open 2022 | Cape Town RSA | 7.1 | Daniel Cawdery | Calvin John Klaasen | 1-0 | 26 | Open |
| 82 | 2022-07-12 | South African Open 2022 | Cape Town RSA | 6.4 | Justin Barend Wilken | Calvin John Klaasen | 0-1 | 37 | Open |
| 83 | 2022-07-11 | South African Open 2022 | Cape Town RSA | 5.5 | Calvin John Klaasen | Xolani Cebo Mathebula | 1-0 | 64 | Open |
| 84 | 2022-07-10 | South African Open 2022 | Cape Town RSA | 4.9 | Reegan Palmer | Calvin John Klaasen | 0-1 | 51 | Open |
| 85 | 2022-07-10 | South African Open 2022 | Cape Town RSA | 3.8 | Calvin John Klaasen | Minenhle Junior Mncwabe | 1/2-1/2 | 50 | Open |
| 86 | 2022-07-09 | South African Open 2022 | Cape Town RSA | 2.5 | Albrecht Van Zyl | Calvin John Klaasen | 1/2-1/2 | 41 | Open |
| 87 | 2022-07-09 | South African Open 2022 | Cape Town RSA | 1.5 | Calvin John Klaasen | Clayton Macheka | 1-0 | 50 | Open |
| 88 | 2022-05-13 | ch-RSA 2022 | Cape Town RSA | 8.4 | Kenneth Sean Willenberg | Calvin John Klaasen | 0-1 | 40 | Open |
| 89 | 2022-05-12 | ch-RSA 2022 | Cape Town RSA | 7.1 | Calvin John Klaasen | Khanya Mazibuko | 1-0 | 56 | Open |
| 90 | 2022-05-11 | ch-RSA 2022 | Cape Town RSA | 6.3 | Daniel Barrish | Calvin John Klaasen | 1/2-1/2 | 77 | Open |
| 91 | 2022-05-10 | ch-RSA 2022 | Cape Town RSA | 5.2 | Calvin John Klaasen | Watu Kobese | 0-1 | 41 | Open |
| 92 | 2022-05-09 | ch-RSA 2022 | Cape Town RSA | 4.2 | Daniel Cawdery | Calvin John Klaasen | 1-0 | 34 | Open |
| 93 | 2022-05-08 | ch-RSA 2022 | Cape Town RSA | 3.3 | Calvin John Klaasen | Shabir Hussain Bhawoodien | 1/2-1/2 | 57 | Open |
| 94 | 2022-05-08 | ch-RSA 2022 | Cape Town RSA | 2.1 | Banele Mhango | Calvin John Klaasen | 1-0 | 74 | Open |
| 95 | 2022-05-07 | ch-RSA 2022 | Cape Town RSA | 1.4 | Calvin John Klaasen | Kenneth Terence Solomon | 1/2-1/2 | 41 | Open |
| 96 | 2022-01-04 | Titled Tuesday 4th Jan | chess.com INT | 9 | Calvin John Klaasen | Fernando Broca Jimenez | 0-1 | 43 | Open |
| 97 | 2022-01-04 | Titled Tuesday 4th Jan | chess.com INT | 8 | Sharvesh Deviprasath | Calvin John Klaasen | 1-0 | 34 | Open |
| 98 | 2022-01-04 | Titled Tuesday 4th Jan | chess.com INT | 7 | Calvin John Klaasen | Prithu Gupta | 1-0 | 29 | Open |
| 99 | 2022-01-04 | Titled Tuesday 4th Jan | chess.com INT | 6 | Artem Omelja | Calvin John Klaasen | 1-0 | 33 | Open |
| 100 | 2022-01-04 | Titled Tuesday 4th Jan | chess.com INT | 5 | Calvin John Klaasen | Eduard Ashiev | 1-0 | 24 | Open |
| 101 | 2022-01-04 | Titled Tuesday 4th Jan | chess.com INT | 4 | Calvin John Klaasen | Nikolai Vlassov | 0-1 | 30 | Open |
| 102 | 2022-01-04 | Titled Tuesday 4th Jan | chess.com INT | 3 | Mike Sailer | Calvin John Klaasen | 0-1 | 39 | Open |
| 103 | 2022-01-04 | Titled Tuesday 4th Jan | chess.com INT | 2 | Calvin John Klaasen | David Paravyan | 0-1 | 25 | Open |
| 104 | 2019-12-17 | ch-RSA 2019 | Cape Town RSA | 11.5 | Calvin John Klaasen | Benjamin Vincent Hercules | 1/2-1/2 | 29 | Open |
| 105 | 2019-12-16 | ch-RSA 2019 | Cape Town RSA | 10.2 | Michael James | Calvin John Klaasen | 0-1 | 39 | Open |
| 106 | 2019-12-15 | ch-RSA 2019 | Cape Town RSA | 9.6 | Calvin John Klaasen | Roland Bezuidenhout | 0-1 | 40 | Open |
| 107 | 2019-12-14 | ch-RSA 2019 | Cape Town RSA | 8.1 | Paul Gluckman | Calvin John Klaasen | 1-0 | 55 | Open |
| 108 | 2019-12-13 | ch-RSA 2019 | Cape Town RSA | 7.6 | Roberto N De Abreu | Calvin John Klaasen | 1/2-1/2 | 0 | Open |
| 109 | 2019-12-11 | ch-RSA 2019 | Cape Town RSA | 5.5 | Matt Pon | Calvin John Klaasen | 1/2-1/2 | 21 | Open |
| 110 | 2019-12-10 | ch-RSA 2019 | Cape Town RSA | 4.3 | Calvin John Klaasen | Kenneth Terence Solomon | 0-1 | 38 | Open |
| 111 | 2019-12-09 | ch-RSA 2019 | Cape Town RSA | 3.4 | Daniel Barrish | Calvin John Klaasen | 1-0 | 35 | Open |
| 112 | 2019-12-08 | ch-RSA 2019 | Cape Town RSA | 2.4 | Calvin John Klaasen | Keith Khumalo | 1-0 | 59 | Open |
| 113 | 2019-12-07 | ch-RSA 2019 | Cape Town RSA | 1.3 | Mohamed Ozayr Bhawoodien | Calvin John Klaasen | 1/2-1/2 | 37 | Open |
| 114 | 2019-07-16 | ch-Africa 2019 | Hammamet TUN | 8.15 | Leykun Mesfin | Calvin John Klaasen | 0-1 | 59 | Open |
| 115 | 2019-07-15 | ch-Africa 2019 | Hammamet TUN | 7.17 | Calvin John Klaasen | Sasha WINSTON-ONYIAH | 1-0 | 52 | Open |
| 116 | 2019-07-13 | ch-Africa 2019 | Hammamet TUN | 5.1 | Calvin John Klaasen | Essam El Gindy | 0-1 | 71 | Open |
| 117 | 2019-07-12 | ch-Africa 2019 | Hammamet TUN | 4.9 | Douglas D Munenga | Calvin John Klaasen | 1-0 | 58 | Open |
| 118 | 2019-07-11 | ch-Africa 2019 | Hammamet TUN | 3.4 | Calvin John Klaasen | Adham Fawzy | 1/2-1/2 | 57 | Open |
| 119 | 2019-04-22 | Capablanca Festival IM | Pretoria RSA | 9.5 | Calvin John Klaasen | Sahaj Grover | 0-1 | 46 | Open |
| 120 | 2019-04-22 | Capablanca Festival IM | Pretoria RSA | 8.1 | Dante M Beukes | Calvin John Klaasen | 0-1 | 35 | Open |
| 121 | 2019-04-21 | Capablanca Festival IM | Pretoria RSA | 7.5 | Joseph Mwale | Calvin John Klaasen | 1/2-1/2 | 25 | Open |
| 122 | 2019-04-21 | Capablanca Festival IM | Pretoria RSA | 6.2 | Calvin John Klaasen | Roland Bezuidenhout | 1/2-1/2 | 60 | Open |
| 123 | 2019-04-20 | Capablanca Festival IM | Pretoria RSA | 5.4 | Keith Khumalo | Calvin John Klaasen | 1/2-1/2 | 64 | Open |
| 124 | 2019-04-20 | Capablanca Festival IM | Pretoria RSA | 4.3 | Calvin John Klaasen | Daniel Cawdery | 1/2-1/2 | 8 | Open |
| 125 | 2019-04-19 | Capablanca Festival IM | Pretoria RSA | 3.3 | Rodwell Makoto | Calvin John Klaasen | 1/2-1/2 | 33 | Open |
| 126 | 2019-04-19 | Capablanca Festival IM | Pretoria RSA | 2.4 | Calvin John Klaasen | Daniel Barrish | 1/2-1/2 | 73 | Open |
| 127 | 2019-04-18 | Capablanca Festival IM | Pretoria RSA | 1.2 | Benjamin Vincent Hercules | Calvin John Klaasen | 0-1 | 37 | Open |
| 128 | 2018-10-05 | 43rd Olympiad 2018 | Batumi GEO | 11.42 | Maher Ayyad | Calvin John Klaasen | 0-1 | 43 | Open |
| 129 | 2018-10-04 | 43rd Olympiad 2018 | Batumi GEO | 10.33 | Calvin John Klaasen | Guillermo Vazquez | 0-1 | 63 | Open |
| 130 | 2018-10-02 | 43rd Olympiad 2018 | Batumi GEO | 8.36 | Calvin John Klaasen | Teerachoti Prasitsoonthorn | 1-0 | 40 | Open |
| 131 | 2018-10-01 | 43rd Olympiad 2018 | Batumi GEO | 7.13 | Calvin John Klaasen | Muhammed Batuhan Dastan | 1-0 | 36 | Open |
| 132 | 2018-09-30 | 43rd Olympiad 2018 | Batumi GEO | 6.4 | Omran Al Hosani | Calvin John Klaasen | 0-1 | 50 | Open |
| 133 | 2018-09-27 | 43rd Olympiad 2018 | Batumi GEO | 4.58 | Ras Malaku Lorne | Calvin John Klaasen | 1/2-1/2 | 100 | Open |
| 134 | 2018-09-26 | 43rd Olympiad 2018 | Batumi GEO | 3.25 | Calvin John Klaasen | Petr Kostenko | 1-0 | 95 | Open |
| 135 | 2018-09-25 | 43rd Olympiad 2018 | Batumi GEO | 2.17 | Jure Skoberne | Calvin John Klaasen | 1-0 | 25 | Open |
| 136 | 2018-09-24 | 43rd Olympiad 2018 | Batumi GEO | 1.85 | Calvin John Klaasen | Samuel Gabius Britus | 1-0 | 55 | Open |
| 137 | 2018-07-03 | ch-Commonwealth 2018 | New Delhi IND | 9.18 | Chudasama Ankit | Calvin John Klaasen | 0-1 | 48 | Open |
| 138 | 2018-07-02 | ch-Commonwealth 2018 | New Delhi IND | 8.21 | Calvin John Klaasen | Paul Gluckman | 1-0 | 40 | Open |
| 139 | 2018-07-01 | ch-Commonwealth 2018 | New Delhi IND | 7.23 | Calvin John Klaasen | Mukherjee Arpita | 1/2-1/2 | 117 | Open |
| 140 | 2018-06-29 | ch-Commonwealth 2018 | New Delhi IND | 4.2 | Sreeshwan Maralakshikari | Calvin John Klaasen | 1-0 | 38 | Open |
| 141 | 2018-05-01 | Capablanca Festival GM | Pretoria RSA | 9.2 | Calvin John Klaasen | Milanto Harifidy Ralison | 1/2-1/2 | 43 | Open |
| 142 | 2018-04-30 | Capablanca Festival GM | Pretoria RSA | 8.4 | Aleksa Strikovic | Calvin John Klaasen | 1/2-1/2 | 16 | Open |
| 143 | 2018-04-30 | Capablanca Festival GM | Pretoria RSA | 7.3 | Calvin John Klaasen | Alejandro Hoffman | 1/2-1/2 | 11 | Open |
| 144 | 2018-04-29 | Capablanca Festival GM | Pretoria RSA | 6.3 | Jack Van Zyl-Rudd | Calvin John Klaasen | 1/2-1/2 | 31 | Open |
| 145 | 2018-04-28 | Capablanca Festival GM | Pretoria RSA | 5.4 | Calvin John Klaasen | Bernardo Roselli Mailhe | 1/2-1/2 | 60 | Open |
| 146 | 2018-04-28 | Capablanca Festival GM | Pretoria RSA | 4.2 | Daniel Cawdery | Calvin John Klaasen | 1/2-1/2 | 20 | Open |
| 147 | 2018-04-27 | Capablanca Festival GM | Pretoria RSA | 3.5 | Calvin John Klaasen | Sahaj Grover | 0-1 | 30 | Open |
| 148 | 2018-04-27 | Capablanca Festival GM | Pretoria RSA | 2.1 | Andrew Kayonde | Calvin John Klaasen | 1/2-1/2 | 48 | Open |
| 149 | 2018-04-26 | Capablanca Festival GM | Pretoria RSA | 1.5 | Watu Kobese | Calvin John Klaasen | 1-0 | 34 | Open |
| 150 | 2018-03-18 | Boardwalk Pearson IM 2018 | Port Elizabeth RSA | 9.5 | Calvin John Klaasen | Geoffrey Luanja | 0-1 | 37 | Open |
| 151 | 2018-03-17 | Boardwalk Pearson IM 2018 | Port Elizabeth RSA | 8.1 | Donaldo Paiva | Calvin John Klaasen | 1-0 | 51 | Open |
| 152 | 2018-03-16 | Boardwalk Pearson IM 2018 | Port Elizabeth RSA | 7.5 | Sahaj Grover | Calvin John Klaasen | 1-0 | 55 | Open |
| 153 | 2018-03-15 | Boardwalk Pearson IM 2018 | Port Elizabeth RSA | 6.2 | Calvin John Klaasen | Daniel Cawdery | 1/2-1/2 | 9 | Open |
| 154 | 2018-03-15 | Boardwalk Pearson IM 2018 | Port Elizabeth RSA | 5.4 | David Silva | Calvin John Klaasen | 1/2-1/2 | 49 | Open |
| 155 | 2018-03-14 | Boardwalk Pearson IM 2018 | Port Elizabeth RSA | 4.3 | Calvin John Klaasen | Providence Oatlhotse | 1/2-1/2 | 70 | Open |
| 156 | 2018-03-13 | Boardwalk Pearson IM 2018 | Port Elizabeth RSA | 3.3 | Jack Van Zyl-Rudd | Calvin John Klaasen | 1-0 | 48 | Open |
| 157 | 2018-03-13 | Boardwalk Pearson IM 2018 | Port Elizabeth RSA | 2.4 | Calvin John Klaasen | Rodwell Makoto | 1/2-1/2 | 39 | Open |
| 158 | 2018-03-12 | Boardwalk Pearson IM 2018 | Port Elizabeth RSA | 1.3 | Joseph Mwale | Calvin John Klaasen | 1/2-1/2 | 83 | Open |
| 159 | 2017-12-19 | ch-RSA 2017 | Cape Town RSA | 11.3 | Calvin John Klaasen | Jacob Dumisani Mnguni | 1-0 | 33 | Open |
| 160 | 2017-12-18 | ch-RSA 2017 | Cape Town RSA | 10.4 | Donovan Van den Heever | Calvin John Klaasen | 1/2-1/2 | 25 | Open |
| 161 | 2017-12-17 | ch-RSA 2017 | Cape Town RSA | 9.4 | Calvin John Klaasen | Johannes Manyedi Mabusela | 1/2-1/2 | 49 | Open |
| 162 | 2017-12-16 | ch-RSA 2017 | Cape Town RSA | 8.3 | Daniel Barrish | Calvin John Klaasen | 1/2-1/2 | 29 | Open |
| 163 | 2017-12-15 | ch-RSA 2017 | Cape Town RSA | 7.5 | Calvin John Klaasen | Charles De Villiers | 1/2-1/2 | 45 | Open |
| 164 | 2017-12-14 | ch-RSA 2017 | Cape Town RSA | 6.2 | Watu Kobese | Calvin John Klaasen | 1/2-1/2 | 18 | Open |
| 165 | 2017-12-13 | ch-RSA 2017 | Cape Town RSA | 5.6 | Calvin John Klaasen | Dennis Ovcina | 1/2-1/2 | 22 | Open |
| 166 | 2017-12-12 | ch-RSA 2017 | Cape Town RSA | 4.1 | Mohamed Ozayr Bhawoodien | Calvin John Klaasen | 0-1 | 27 | Open |
| 167 | 2017-12-11 | ch-RSA 2017 | Cape Town RSA | 3.6 | Benjamin Vincent Hercules | Calvin John Klaasen | 0-1 | 54 | Open |
| 168 | 2017-12-10 | ch-RSA 2017 | Cape Town RSA | 2.2 | Calvin John Klaasen | Ryan Pierre Van Rensburg | 1/2-1/2 | 34 | Open |
| 169 | 2017-12-09 | ch-RSA 2017 | Cape Town RSA | 1.5 | Kgaugelo Mosetlhe | Calvin John Klaasen | 0-1 | 40 | Open |
| 170 | 2017-05-01 | PSS IM Norm 2017 | Johannesburg RSA | 9.5 | Jha Sriram | Calvin John Klaasen | 1/2-1/2 | 25 | Open |
| 171 | 2017-04-30 | PSS IM Norm 2017 | Johannesburg RSA | 8.2 | Calvin John Klaasen | Sahaj Grover | 0-1 | 41 | Open |
| 172 | 2017-04-30 | PSS IM Norm 2017 | Johannesburg RSA | 7.4 | Rodwell Makoto | Calvin John Klaasen | 1/2-1/2 | 18 | Open |
| 173 | 2017-04-29 | PSS IM Norm 2017 | Johannesburg RSA | 6.3 | Calvin John Klaasen | Spencer Masango | 1-0 | 39 | Open |
| 174 | 2017-04-28 | PSS IM Norm 2017 | Johannesburg RSA | 5.3 | Kgaugelo Mosetlhe | Calvin John Klaasen | 1-0 | 39 | Open |
| 175 | 2017-04-28 | PSS IM Norm 2017 | Johannesburg RSA | 4.4 | Calvin John Klaasen | Daniel Barrish | 1/2-1/2 | 65 | Open |
| 176 | 2017-04-27 | PSS IM Norm 2017 | Johannesburg RSA | 3.2 | Daniel Jere | Calvin John Klaasen | 1/2-1/2 | 65 | Open |
| 177 | 2017-04-27 | PSS IM Norm 2017 | Johannesburg RSA | 2.5 | Calvin John Klaasen | Farrukh Amonatov | 1/2-1/2 | 32 | Open |
| 178 | 2017-04-26 | PSS IM Norm 2017 | Johannesburg RSA | 1.1 | Calvin John Klaasen | Benjamin Vincent Hercules | 1/2-1/2 | 40 | Open |
| 179 | 2016-12-04 | African Chess Lounge IM | Cape Town RSA | 9.1 | Calvin John Klaasen | Daud Amini | 1-0 | 36 | Open |
| 180 | 2016-12-03 | African Chess Lounge IM | Cape Town RSA | 8.5 | Daniel Anwuli | Calvin John Klaasen | 0-1 | 57 | Open |
| 181 | 2016-12-02 | African Chess Lounge IM | Cape Town RSA | 7.2 | Calvin John Klaasen | Ryan Pierre Van Rensburg | 1/2-1/2 | 17 | Open |
| 182 | 2016-12-01 | African Chess Lounge IM | Cape Town RSA | 6.4 | Daniel Jere | Calvin John Klaasen | 1-0 | 34 | Open |
| 183 | 2016-11-30 | African Chess Lounge IM | Cape Town RSA | 5.3 | Calvin John Klaasen | Daniel Barrish | 1-0 | 31 | Open |
| 184 | 2016-11-29 | African Chess Lounge IM | Cape Town RSA | 4.3 | Watu Kobese | Calvin John Klaasen | 1-0 | 38 | Open |
| 185 | 2016-11-28 | African Chess Lounge IM | Cape Town RSA | 3.4 | Calvin John Klaasen | Charles De Villiers | 1/2-1/2 | 70 | Open |
| 186 | 2016-11-27 | African Chess Lounge IM | Cape Town RSA | 2.2 | Henry Robert Steel | Calvin John Klaasen | 1/2-1/2 | 20 | Open |
| 187 | 2016-11-27 | African Chess Lounge IM | Cape Town RSA | 1.5 | Calvin John Klaasen | Phemelo Khetho | 1-0 | 26 | Open |
| 188 | 2016-09-13 | 42nd Olympiad 2016 | Baku AZE | 11.49 | Calvin John Klaasen | Brandon Wilson | 1/2-1/2 | 86 | Open |
| 189 | 2016-09-12 | 42nd Olympiad 2016 | Baku AZE | 10.43 | Emarald Takudzwa Mushore | Calvin John Klaasen | 0-1 | 24 | Open |
| 190 | 2016-09-09 | 42nd Olympiad 2016 | Baku AZE | 7.38 | Calvin John Klaasen | Ben Hague | 1/2-1/2 | 33 | Open |
| 191 | 2016-09-08 | 42nd Olympiad 2016 | Baku AZE | 6.28 | Anh Khoi Nguyen | Calvin John Klaasen | 1-0 | 35 | Open |
| 192 | 2016-09-04 | 42nd Olympiad 2016 | Baku AZE | 3.52 | Calvin John Klaasen | Maung Kyaw Zaw Hein Maung | 1/2-1/2 | 44 | Open |
| 193 | 2016-09-02 | 42nd Olympiad 2016 | Baku AZE | 1.76 | Sobhi Mziyako | Calvin John Klaasen | 0-1 | 25 | Open |
| 194 | 2016-05-02 | Capablanca Festival IM | Pretoria RSA | 9.2 | Dennis Ovcina | Calvin John Klaasen | 1/2-1/2 | 38 | Open |
| 195 | 2016-05-01 | Capablanca Festival IM | Pretoria RSA | 8.5 | Calvin John Klaasen | Providence Oatlhotse | 1-0 | 63 | Open |
| 196 | 2016-04-30 | Capablanca Festival IM | Pretoria RSA | 7.1 | Calvin John Klaasen | Chitumbo Mwali | 1-0 | 30 | Open |
| 197 | 2016-04-30 | Capablanca Festival IM | Pretoria RSA | 6.5 | Richmond Phiri | Calvin John Klaasen | 1/2-1/2 | 25 | Open |
| 198 | 2016-04-29 | Capablanca Festival IM | Pretoria RSA | 5.2 | Calvin John Klaasen | Gavin Albert Anderson | 1/2-1/2 | 21 | Open |
| 199 | 2016-04-28 | Capablanca Festival IM | Pretoria RSA | 4.4 | Andrew Kayonde | Calvin John Klaasen | 0-1 | 44 | Open |
| 200 | 2016-04-27 | Capablanca Festival IM | Pretoria RSA | 3.3 | Calvin John Klaasen | Daniel Jere | 0-1 | 42 | Open |
| 201 | 2016-04-27 | Capablanca Festival IM | Pretoria RSA | 2.3 | Daniel Anwuli | Calvin John Klaasen | 1-0 | 35 | Open |
| 202 | 2016-04-26 | Capablanca Festival IM | Pretoria RSA | 1.4 | Calvin John Klaasen | Donovan Van den Heever | 1/2-1/2 | 25 | Open |
| 203 | 2015-07-11 | South African Open 2015 | Cape Town RSA | 11.12 | Mofoka Alfred Pesa | Calvin John Klaasen | 1/2-1/2 | 60 | Open |
| 204 | 2015-07-09 | South African Open 2015 | Cape Town RSA | 9.11 | Nashlen Govindasamy | Calvin John Klaasen | 1/2-1/2 | 53 | Open |
| 205 | 2015-07-08 | South African Open 2015 | Cape Town RSA | 8.5 | Calvin John Klaasen | Watu Kobese | 0-1 | 39 | Open |
| 206 | 2015-07-07 | South African Open 2015 | Cape Town RSA | 7.12 | Frederick Odendaal | Calvin John Klaasen | 0-1 | 38 | Open |
| 207 | 2015-07-06 | South African Open 2015 | Cape Town RSA | 6.16 | Calvin John Klaasen | Justin Barend Wilken | 1-0 | 33 | Open |
| 208 | 2015-07-05 | South African Open 2015 | Cape Town RSA | 5.12 | Paul D. Darling | Calvin John Klaasen | 1/2-1/2 | 56 | Open |
| 209 | 2015-07-05 | South African Open 2015 | Cape Town RSA | 4.18 | Calvin John Klaasen | Mpho D. Mashope | 1-0 | 41 | Open |
| 210 | 2015-07-04 | South African Open 2015 | Cape Town RSA | 3.3 | Abhijit Kunte | Calvin John Klaasen | 1-0 | 36 | Open |
| 211 | 2015-07-04 | South African Open 2015 | Cape Town RSA | 2.15 | Calvin John Klaasen | Xikombi Baloyi | 1-0 | 32 | Open |
| 212 | 2015-07-03 | South African Open 2015 | Cape Town RSA | 1.18 | Jannie Saffier | Calvin John Klaasen | 0-1 | 32 | Open |
| 213 | 2015-03-28 | Cape Town Classic 2015 | Cape Town RSA | 7.4 | Maxwell Solomon | Calvin John Klaasen | 1/2-1/2 | 58 | Open |
| 214 | 2015-03-27 | Cape Town Classic 2015 | Cape Town RSA | 6.2 | Calvin John Klaasen | Spencer Masango | 1/2-1/2 | 42 | Open |
| 215 | 2015-03-26 | Cape Town Classic 2015 | Cape Town RSA | 5.3 | Watu Kobese | Calvin John Klaasen | 1-0 | 111 | Open |
| 216 | 2015-03-25 | Cape Town Classic 2015 | Cape Town RSA | 4.3 | Calvin John Klaasen | Rodwell Makoto | 1/2-1/2 | 60 | Open |
| 217 | 2015-03-24 | Cape Town Classic 2015 | Cape Town RSA | 3.2 | Gillan Bwalya | Calvin John Klaasen | 1-0 | 43 | Open |
| 218 | 2015-03-23 | Cape Town Classic 2015 | Cape Town RSA | 2.4 | Calvin John Klaasen | Shabir Hussain Bhawoodien | 1/2-1/2 | 51 | Open |
| 219 | 2015-03-22 | Cape Town Classic 2015 | Cape Town RSA | 1.1 | Calvin John Klaasen | Musatwe Simutowe | 0-1 | 37 | Open |
| 220 | 2014-12-21 | ch-Africa 2014 | Windhoek NAM | 8.7 | Donovan Van den Heever | Calvin John Klaasen | 1-0 | 30 | Open |
| 221 | 2014-12-20 | ch-Africa 2014 | Windhoek NAM | 7.6 | Calvin John Klaasen | Persson Abrantes | 0-1 | 69 | Open |
| 222 | 2014-12-19 | ch-Africa 2014 | Windhoek NAM | 6.4 | Daniel Jere | Calvin John Klaasen | 1-0 | 52 | Open |
| 223 | 2014-12-17 | ch-Africa 2014 | Windhoek NAM | 5.4 | Calvin John Klaasen | Andrew Kayonde | 1-0 | 35 | Open |
| 224 | 2014-12-16 | ch-Africa 2014 | Windhoek NAM | 4.7 | Joseph Mwale | Calvin John Klaasen | 0-1 | 49 | Open |
| 225 | 2014-12-15 | ch-Africa 2014 | Windhoek NAM | 3.5 | Calvin John Klaasen | Harold Wanyama | 0-1 | 36 | Open |
| 226 | 2014-12-14 | ch-Africa 2014 | Windhoek NAM | 2.5 | Bomo Lovet Kigigha | Calvin John Klaasen | 1/2-1/2 | 22 | Open |
| 227 | 2014-12-13 | ch-Africa 2014 | Windhoek NAM | 1.1 | Calvin John Klaasen | Ahmed Adly | 1-0 | 30 | Open |
| 228 | 2014-09-21 | Durban Open 2014 | Durban RSA | 3.12 | Calvin John Klaasen | Anton Goosen | 0-1 | 0 | Open |
| 229 | 2014-09-21 | Durban Open 2014 | Durban RSA | 2.4 | Gilberto Hernandez Guerrero | Calvin John Klaasen | 1/2-1/2 | 19 | Open |
| 230 | 2014-09-20 | Durban Open 2014 | Durban RSA | 1.29 | Calvin John Klaasen | 14320568 | 1-0 | 33 | Open |
| 231 | 2014-01-12 | ch-RSA Closed 2014 | Cape Town RSA | 11.5 | Calvin John Klaasen | Mohamed Ozayr Bhawoodien | 1/2-1/2 | 17 | Open |
| 232 | 2014-01-11 | ch-RSA Closed 2014 | Cape Town RSA | 9.6 | Calvin John Klaasen | Charles De Villiers | 1/2-1/2 | 66 | Open |
| 233 | 2014-01-11 | ch-RSA Closed 2014 | Cape Town RSA | 10.2 | Jacques C. Meintjes | Calvin John Klaasen | 1/2-1/2 | 37 | Open |
| 234 | 2014-01-10 | ch-RSA Closed 2014 | Cape Town RSA | 8.1 | Watu Kobese | Calvin John Klaasen | 1/2-1/2 | 108 | Open |
| 235 | 2014-01-09 | ch-RSA Closed 2014 | Cape Town RSA | 7.6 | Shabir Hussain Bhawoodien | Calvin John Klaasen | 1-0 | 40 | Open |
| 236 | 2014-01-08 | ch-RSA Closed 2014 | Cape Town RSA | 6.2 | Calvin John Klaasen | David Gluckman | 1/2-1/2 | 24 | Open |
| 237 | 2014-01-07 | ch-RSA Closed 2014 | Cape Town RSA | 5.5 | Johannes Manyedi Mabusela | Calvin John Klaasen | 0-1 | 41 | Open |
| 238 | 2014-01-06 | ch-RSA Closed 2014 | Cape Town RSA | 4.3 | Calvin John Klaasen | Donovan Van den Heever | 0-1 | 58 | Open |
| 239 | 2014-01-05 | ch-RSA Closed 2014 | Cape Town RSA | 3.4 | Daniel Cawdery | Calvin John Klaasen | 1-0 | 27 | Open |
| 240 | 2014-01-05 | ch-RSA Closed 2014 | Cape Town RSA | 2.4 | Calvin John Klaasen | Ryan Pierre Van Rensburg | 1/2-1/2 | 23 | Open |
| 241 | 2014-01-04 | ch-RSA Closed 2014 | Cape Town RSA | 1.3 | Deon Solomons | Calvin John Klaasen | 0-1 | 26 | Open |
| 242 | 2013-07-13 | Commonwealth & RSA Open | Port Elizabeth RSA | 10.44 | Calvin John Klaasen | Claude Van Heerden | 1-0 | 41 | Open |
| 243 | 2013-07-12 | Commonwealth & RSA Open | Port Elizabeth RSA | 9.25 | Calvin John Klaasen | Mofoka Alfred Pesa | 0-1 | 31 | Open |
| 244 | 2013-07-11 | Commonwealth & RSA Open | Port Elizabeth RSA | 8.16 | Dumisa Jacob Nkosi | Calvin John Klaasen | 1-0 | 34 | Open |
| 245 | 2013-07-10 | Commonwealth & RSA Open | Port Elizabeth RSA | 7.21 | Calvin John Klaasen | Michael T Masungwini | 1-0 | 30 | Open |
| 246 | 2013-07-09 | Commonwealth & RSA Open | Port Elizabeth RSA | 6.27 | Heinrich Basson | Calvin John Klaasen | 1/2-1/2 | 37 | Open |
| 247 | 2013-07-09 | Commonwealth & RSA Open | Port Elizabeth RSA | 5.38 | Calvin John Klaasen | Shubham Chandna | 1-0 | 39 | Open |
| 248 | 2013-07-07 | Commonwealth & RSA Open | Port Elizabeth RSA | 3.35 | Calvin John Klaasen | Charlize Van Zyl | 1/2-1/2 | 47 | Open |
| 249 | 2013-07-07 | Commonwealth & RSA Open | Port Elizabeth RSA | 2.32 | Paul D. Darling | Calvin John Klaasen | 1/2-1/2 | 54 | Open |
| 250 | 2013-07-06 | Commonwealth & RSA Open | Port Elizabeth RSA | 1.32 | Calvin John Klaasen | 14309734 | 1-0 | 37 | Open |
| 251 | 2013-05-07 | Zone 4.3 2013 | Gaborone BOT | 7.6 | Jona Chaka | Calvin John Klaasen | 0-1 | 33 | Open |
| 252 | 2013-05-06 | Zone 4.3 2013 | Gaborone BOT | 6.5 | Thato Olebile | Calvin John Klaasen | 1-0 | 51 | Open |
| 253 | 2013-05-05 | Zone 4.3 2013 | Gaborone BOT | 5.5 | Calvin John Klaasen | Ignatius Njobvu | 0-1 | 66 | Open |
| 254 | 2013-05-02 | Zone 4.3 2013 | Gaborone BOT | 3.2 | Deon Solomons | Calvin John Klaasen | 1/2-1/2 | 32 | Open |
| 255 | 2013-05-02 | Zone 4.3 2013 | Gaborone BOT | 2.5 | Calvin John Klaasen | Thabo Gumpo | 1-0 | 57 | Open |
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