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* [http://www.talkchess.com/forum/viewtopic.php?t=56938 Old programs CHAOS and USC] by Eugene Piercy, [[CCC]], July 11, 2015
: [http://www.talkchess.com/forum/viewtopic.php?t=56938&start=2 Re: Old programs CHAOS and USC] by [[Dann Corbit]], [[CCC]], July 11, 2015
* [http://www.talkchess.com/forum3/viewtopic.php?f=2&t=70939 The mystery of Alex Bernstein] by [[Sergei Markoff|Sergei S. Markoff]], [[CCC]], June 06, 2019 » [[Alex Bernstein]]
* [http://www.talkchess.com/forum3/viewtopic.php?f=2&t=70940 Widely unknown pioneering chess "paper machine" by Gunter Sсhliebs] by [[Sergei Markoff|Sergei S. Markoff]], [[CCC]], June 06, 2019
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