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an [[:Category:Open Source|open source chess engine]] supporting the [[Chess Engine Communication Protocol]] written by [[Oliver Brausch]] with [[C]] and [[Java]] versions available, and binaries running under [[Windows]], [[Linux]] and [[Mac OS]] <ref>[http://brausch.org/home/chess/index.html Chess Engine OliThink] by [[Oliver Brausch]]</ref>. The completely rewritten OliThink 5.x has a very fast [[Move Generation|move generator]] based on the framework of the [[Perft]] program OliPerft with a plain [[Bitboards|bitboard]] board representation without any [[Piece-Lists|piece-lists]] or [[Array|board arrays]] <ref>[http://www.talkchess.com/forum/viewtopic.php?t=18590 OliPerft with divide Option as Pre Version for OliThink 5] by [[Oliver Brausch]], [[CCC]], December 27, 2007</ref>. OliThink's [[Evaluation|evaluation]] consists almost of [[Material|material balance]] and [[Mobility|mobility]], plus a very simple [[Pawn Structure|pawn structure]] evaluation, rewarding [[Passed Pawn|passed pawns]]. OliThink 4.13 played the [[CCT6]] in 2004, with four points out of nine games <ref>[https://www.stmintz.com/ccc/index.php?id=346753 OliThink@CCT6 - Programmers View] by [[Oliver Brausch]], [[CCC]], February 03, 2004</ref>. In June 2016, after a ten years break, Oliver Brausch published OliThink '''5.4.0''' with a big leap in [[Playing Strength|playing strength]] due to modifications in [[Draw Evaluation|evaluation]] of likely [[Draw|drawn]] [[Endgame|endgames]] <ref>[http://www.talkchess.com/forum3/viewtopic.php?f=7&t=74203 OliThink 5.4.0 has been published with an big leap in strength for only 3 lines of code] by [[Oliver Brausch]], [[CCC]], June 16, 2020</ref>.