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'''2021'''
* [http://www.talkchess.com/forum3/viewtopic.php?f=2&t=76318 Crystal 3.1] by [[Joseph Ellis]], [[CCC]], January 14, 2021
* [https://www.talkchess.com/forum3/viewtopic.php?f=2&t=78974 Crystal 4] by [[Joseph Ellis]], [[CCC]], December 25, 2021
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