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* [http://www.talkchess.com/forum3/viewtopic.php?f=2&t=74175 I think Crystal must have an eval bug] by [[Dann Corbit]], [[CCC]], June 14, 2020
* [http://www.talkchess.com/forum3/viewtopic.php?f=2&t=75072 Crystal 3.0] by [[Joseph Ellis]], [[CCC]], September 10, 2020
'''2021'''
* [http://www.talkchess.com/forum3/viewtopic.php?f=2&t=76318 Crystal 3.1] by [[Joseph Ellis]], [[CCC]], January 14, 2021
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