Crystal

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Crystal, a UCI chess engine by Joseph Ellis derived from Stockfish, first published in August 2019. Crystal focuses on better problem solving abilities, and includes fortress detection code. It further addresses some rarely occurring positional or tactical blindness due to too aggressive reductions and pruning. Crystal 3.0, released in September 2020, is able to use NNUE evaluaton.

=Forum Posts=

2019

 * Crystal by Joseph Ellis, CCC, August 14, 2019
 * Crystal, the new tactical monster by Dann Corbit, CCC, August 28, 2019
 * Honey and Crystal-Honey X5j Releases by MikeB, CCC, September 24, 2019
 * Crystal solves a 74 mover ... in 11 seconds by Jouni Uski, November 19, 2019

2020 ...
2021 =External Links=
 * Crystal Update by Joseph Ellis, CCC, April 08, 2020
 * Bug in Crystal ? by Vincent Lejeune, CCC, June 04, 2020
 * I think Crystal must have an eval bug by Dann Corbit, CCC, June 14, 2020
 * Crystal 3.0 by Joseph Ellis, CCC, September 10, 2020
 * Crystal 3.1 by Joseph Ellis, CCC, January 14, 2021
 * Crystal 4 by Joseph Ellis, CCC, December 25, 2021

Chess Engine

 * GitHub - jhellis3/Stockfish at crystal

Misc

 * Crystal (disambiguation) from Wikipedia
 * Crystal from Wikipedia
 * Coryell/Mouzon - Crystalization, Back Together Again (1977), YouTube Video
 * feat: Larry Coryell, Alphonse Mouzon, Philip Catherine, John Lee

=References= Up one Level