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==2020 ...==
* [https://www.talkchess.com/forum3/viewtopic.php?f=2&t=78281 Colossus Chess 2021 !!] by [[Thorsten Czub]], [[CCC]], September 28, 2021
* [https://www.talkchess.com/forum3/viewtopic.php?f=2&t=78303 Colossus 2021a - Minor updates] by [[Martin Bryant]], [[CCC]], October 01, 2021
=External Links=