News
| 5 September 2023 | CoCo 2023 full run completed |
| 28 August 2023 | new CoCo SC member |
| 23 August 2023 | CoCo 2023 results announced |
| 26 August 2022 | CoCo 2022 full run completed |
| 23 August 2022 | new CoCo SC member |
| 2 August 2022 | CoCo 2022 results announced |
| 18 May 2022 | CoCo 2022 call for problems and tools |
| 2 September 2021 | new CoCo SC member |
| 11 August 2021 | CoCo 2021 full run completed |
| 25 July 2021 | CoCo 2021 results announced |
| 27 February 2021 | CoCo 2021 first announcement |
| 12 July 2020 | CoCo 2020 full run completed |
| 30 June 2020 | CoCo 2020 results announced |
| 19 February 2020 | CoCo 2020 first announcement |
| 8 October 2019 | new CoCo SC members and bylaws |
| 12 May 2019 | CoCo 2019 full run completed |
| 5 May 2019 | CoCo results page renewed |
| 31 January 2019 | CoCo 2018 full run completed |
| 18 January 2019 | CoCo 2019 categories announced |
| 18 January 2019 | HRS format modified |
| 22 December 2018 | syntax of CTRS format and MSTRS format simplified |
| 20 December 2018 | syntax of TRS format simplified |
| 5 October 2018 | CoCo 2019 first announcement |
| 2 October 2018 | CoCo 2018 full run (without HRS category) completed |
| 5 August 2018 | semantics of HRS category clarified |
| 17 July 2018 | CoCo 2019 will be part of TOOLympics |