Simplex

**[[Home]] * [[Engines]] * Simplex**
|| [[image:320px-Simplex_Servi_Cycle_at_Barber_Vintage_Motorsports_Museum.jpg link="https://commons.wikimedia.org/wiki/File:Simplex_Servi_Cycle_at_Barber_Vintage_Motorsports_Museum.jpg"]] ||~ || **Simplex**,
an [[UCI]] compliant [[Open Source Engines|open source chess engine]] by [[Antonio Torrecillas]], written in [[Cpp|C++]] and licensed under the [[Free Software Foundation#GPL|GNU General Public License]]. Simplex was first published with sources in 2010, while its development already started at least in 2007 with the intermediate name DarkSimplex due to experiments with the published description of [[DarkThought]] <ref>[[http://www.talkchess.com/forum/viewtopic.php?t=33637|Simplex Updated]] by [[Antonio Torrecillas]], [[CCC]], April 05, 2010</ref> <ref>[[Ernst A. Heinz]] (**1997**). //[[http://people.csail.mit.edu/heinz/dt/node2.html|How DarkThought Plays Chess]].// [[ICGA Journal#20_3|ICCA Journal, Vol. 20, No. 3]]</ref>. ||
|| Simplex Servi-Cycle <ref>[[https://www.flickr.com/photos/k4cay/392793787/in/photostream/|A Simplex Servi-Cycle]] at [[http://www.barbermuseum.org/plan-a-visit/museum-hours|Barber Vintage Motorsports Museum]] by [[https://www.flickr.com/photos/k4cay/|ChuckSchultz]], January 06, 2007, [[https://creativecommons.org/licenses/by-sa/2.0/deed.en|cc-by-sa-2.0]], [[https://en.wikipedia.org/wiki/Wikimedia_Commons|Wikimedia Commons]], [[https://en.wikipedia.org/wiki/Simplex_Manufacturing_Corporation|Simplex Manufacturing Corporation from Wikipedia]]</ref> ||~ ||^ ||
[[toc]]
=Features=
==[[Board Representation]]==
* [[Bitboards]]
* [[Kindergarten Bitboards]]
==[[Search]]==
* [[Iterative Deepening]] with [[Aspiration Windows]]
* [[Alpha-Beta]] [[Principal Variation Search]]
* [[Transposition Table]]
* [[Quiescence Search]]
* [[Null Move Pruning]]
* [[Late Move Reductions]]
* [[Mate Distance Pruning]]
* [[Futility Pruning]]
* [[Internal Iterative Deepening]]
* [[Killer Heuristic]]
* [[History Heuristic]]
==[[Evaluation]]==
* [[Material]]
* [[Piece-Square Tables]]
* [[Tapered Eval]]
* [[Lazy Evaluation]]
* [[Center Control]]
* [[Mobility]]
* [[Pawn Structure]]
> [[Backward Pawn]]
> [[Passed Pawn]]
> [[Candidate Passed Pawn]]
* [[Evaluation of Pieces]]
* [[King Safety]]

=See also=
* [[Rocinante]]
* [[Connectivity#SimplexAndComplex|Simplex and Complex]] in [[Connectivity]]

=Forum Posts=
* [[http://www.open-aurec.com/wbforum/viewtopic.php?f=2&t=50577|Simplex chess engine]] by [[Olivier Deville]], [[Computer Chess Forms|Winboard Forum]], November 18, 2009
* [[http://www.talkchess.com/forum/viewtopic.php?t=33637|Simplex Updated]] by [[Antonio Torrecillas]], [[CCC]], April 05, 2010
* [[http://www.talkchess.com/forum/viewtopic.php?t=36185|Simplex 0.9.6 released]] by [[Antonio Torrecillas]], [[CCC]], September 26, 2010
* [[http://www.talkchess.com/forum/viewtopic.php?t=37559|Simplex 0.9.7 release]] by [[Antonio Torrecillas]], [[CCC]], January 10, 2011
* [[http://www.talkchess.com/forum/viewtopic.php?t=41153|Simplex 0.9.8]] by [[Antonio Torrecillas]], [[CCC]], November 20, 2011

=External Links=
==Chess Engine==
* [[https://sites.google.com/site/barajandotrebejos/|Barajando Trebejos]] (Download [[Rocinante]] and [[Simplex]])
* [[http://kirr.homeunix.org/chess/engines/Jim%20Ablett/SIMPLEX/|Index of /chess/engines/Jim Ablett/SIMPLEX]] by [[Jim Ablett]], hosted by [[Kirill Kryukov]]
* [[http://www.computerchess.org.uk/ccrl/404/cgi/compare_engines.cgi?family=Simplex&print=Rating+list&print=Results+table&print=LOS+table&print=Ponder+hit+table&print=Eval+difference+table&print=Comopp+gamenum+table&print=Overlap+table&print=Score+with+common+opponents|Simplex]] ín [[CCRL|CCRL 40/4]]
==Misc==
* [[https://en.wikipedia.org/wiki/Simplex|Simplex from Wikipedia]]
* [[https://en.wikipedia.org/wiki/Pascal's_simplex|Pascal's simplex from Wikipedia]]
* [[https://en.wikipedia.org/wiki/Simplex_algorithm|Simplex algorithm from Wikipedia]]
* [[http://web.comhem.se/petero2home/simplex/Simplex.txt|Simplex V 1.05]] by [[Peter Österlund]]
* [[https://en.wikipedia.org/wiki/Simplex_graph|Simplex graph from Wikipedia]]
* [[https://en.wikipedia.org/wiki/Simplex_%28disambiguation%29|Simplex (disambiguation) from Wikipedia]]
* [[http://www.jazzitalia.net/Artisti/gaetanovalli.asp|Gaetano Valli]] - Simplex, [[http://www.jazzclubgajo.com/|Jazz Club Gaio]], [[https://en.wikipedia.org/wiki/Ljubljana|Ljubljana]] 2009,  [[https://en.wikipedia.org/wiki/YouTube|YouTube]] Video
> [[media type="youtube" key="1-36nswTvjo" width="560"]]

=References= 
<references />
=What links here?= 
[[include page="Simplex" component="backlinks" limit="40"]]
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