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Home * Engines * Stockfish * Crystal

Mineral Quartz Crystal [1]

a UCI chess engine by Joseph Ellis derived from Stockfish, first published in August 2019 [2]. 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 [3].

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2020 ...


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Chess Engine


feat: Larry Coryell, Alphonse Mouzon, Philip Catherine, John Lee


  1. Mineral Quartz Crystal, USDA Photo 93cs3951 by Ken Hammond, Wikimedia Commons
  2. Crystal by Joseph Ellis, CCC, August 14, 2019
  3. Crystal 3.0 by Joseph Ellis, CCC, September 10, 2020

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