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an [[UCI]] compliant, [[:Category:Derivative|derivative]] [[:Category:Open Source|open source chess engine]] based on [[Fruit]] and [[Toga|Toga II]], written by [[Norman Schmidt]] in [[Cpp|C++]],
licensed under the [[Free Software Foundation#GPL|GPL 3.0]] <ref>[https://en.wikipedia.org/wiki/Fruit_%28software%29#Derivatives Fruit (software) - Derivatives from Wikipedia]</ref>
<ref>IMPORTANT: Cyclone is a fork of [[Toga#1.4beta5c|Toga II 1.4b5 ]] which has been relicensed under the GPL 3. Code from Cyclone cannot be reused in Fruit/Toga which is GPL 2+., [https://web.archive.org/web/20131012012343/http://hardy.uhasselt.be/Toga/posix_versions/ Posix ports of some recent version of Toga II] by [[Michel Van den Bergh]] ([https://en.wikipedia.org/wiki/Wayback_Machine Wayback Machine])</ref>.
Cyclone '''3.4''' uses [[Principal Variation Search|principal variation search]], [[Iterative Deepening|iterative deepening]], [[MVV-LVA]], [[Transposition Table|transposition tables]], [[Null Move Pruning|null-move pruning]], [[Quiescence Search|quiescence search]], [[Futility Pruning|futility pruning]], [[History Leaf Pruning|history pruning]], [[Lazy Evaluation|lazy evaluation]], [[Razoring|razoring]], and various search [[Reductions|reductions]] and [[Extensions|extensions]].
Cyclone's [[Parallel Search|parallel search]] utilizes [[Thread|threads]] and a [[Shared Hash Table|shared hash table]].
