Cyclone, an UCI compliant, derivative open source chess engine under the GNU General Public License 3.0 written by Norman Schmidt in C++, based on Fruit and Toga [1] [2]. Cyclone 3.4 uses principal variation search, iterative deepening, MVV-LVA, transposition tables, null-move pruning, quiescence search, futility pruning, history pruning, lazy evaluation, razoring, and various search reductions and extensions. Cyclone's parallel search utilizes threads using a shared hash table [3]. Cyclone xTreme, based on Fruit 2.1 by Fabien Letouzey, Toga II by Thomas Gaksch, Grapefruit 1.0 by Vadim Demichev, Toga CMLX 145e4 by Teemu Pudas, and Cyclone 3.4 by Norman Schmidt, uses a configuration file to obtain more than 150 evaluation, material, search, and transposition table parameters [4].
Polar cyclone [5]

See also

• Fruit
• Meteorology
• Toga

Forum Posts

• Cyclone 1.0 beta by Norman Schmidt, CCC, July 26, 2008
• Cylone 1.0 beta now available by Norman Schmidt, CCC, July 27, 2008
• Cyclone 1.0 and Cyclops 1.0 avaliable by Norman Schmidt, CCC, August 04, 2008
• Cyclone 2.0 released by Norman Schmidt, CCC, November 03, 2008
• Cyclone 2.1 released by Norman Schmidt, CCC, November 05, 2008
• Cyclone 2.3 released by Norman Schmidt, CCC, December 23, 2008
• Cyclone 3.4 released by Norman Schmidt, CCC, February 01, 2009
• Cyclone by Aaron87747, autochess, April 28, 2009
• Annals of testing an elusive engine by Rainer Neuhäusler, CCC, October 05, 2009
• Cyclone xTreme II by dinosaur123, Rybka Forum, November 11, 2009
• Cyclone / Fire ... question to Norman! by Frank Quisinsky, CCC, April 29, 2010

External Links

Chess Engine

• Cyclone from chesslogik.com
• Fruit (software) - Derivatives from Wikipedia
• Posix ports of some recent version of Toga II by Michel Van den Bergh

Cyclone

• Cyclone from Wikipedia
• cyclic - Wiktionary
• Clone (disambiguation) from Wikipedia

References

1. ^ Fruit (software) - Derivatives from Wikipedia
   
2. ^ IMPORTANT: Cyclone is a fork of 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+., Posix ports of some recent version of Toga II by Michel Van den Bergh
3. ^ Cyclone by Aaron87747, autochess, April 28, 2009
4. ^ Cyclone from chesslogik.com
5. ^ Polar cyclone near Iceland on September 4, 2003, Jacques Descloitres, MODIS Rapid Response Team, NASA/GSFC, NASA Visible Earth: Low off Iceland

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