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**[[Home]] * [[Engines]] * Pigeon** || [[image:320px-Rock_dove_-_natures_pics.jpg link="https://commons.wikimedia.org/wiki/File:Rock_dove_-_natures_pics.jpg"]] ||~ || **Pigeon**, an original 64-bit [[UCI]] chess engine, written in [[Cpp|C++]] by [[Stuart Riffle]]. Pigeon is [[Open Source Engines|open source]], released under the [[https://en.wikipedia.org/wiki/MIT_License|MIT license]]. To allow for [[SIMD and SWAR Techniques|SIMD]] and [[GPU]] acceleration, much of the critical code is branch-free. It performs a [[Color Flipping#Monochrome|monochrome]] [[Move Generation|move generation]] approach, [[Color Flipping|color flipping]] the board after [[Make Move|make move]] <ref>[[https://github.com/StuartRiffle/pigeon/blob/master/src/position.h|pigeon/position.h at master · StuartRiffle/pigeon · GitHub]]</ref> . Pigeon is very much a work in progress, and any feedback is welcome! || || Feral rock pigeon <ref>Feral [[https://en.wikipedia.org/wiki/Rock_dove|Rock Dove]], image by Alan D. Wilson, from [[http://www.naturespicsonline.com/|Natures's Pic's Online]], [[http://creativecommons.org/licenses/by-sa/2.5/|CC BY-SA 2.5]], [[https://en.wikipedia.org/wiki/Wikimedia_Commons|Wikimedia Commons]], [[https://en.wikipedia.org/wiki/Columbidae|Columbidae from Wikipedia]]</ref> ||~ ||^ || [[toc]] =See also= * [[Various Classifications#Bird|Bird]] * [[Falcon]] =Forum Posts= * [[http://www.talkchess.com/forum/viewtopic.php?t=59782|Pigeon (new open source engine)]] by [[Stuart Riffle]], [[CCC]], April 07, 2016 * [[http://www.talkchess.com/forum/viewtopic.php?t=59785|New open source engine - Pigeon]] by [[Stuart Riffle]], [[CCC]], April 07, 2016 * [[http://www.talkchess.com/forum/viewtopic.php?t=59820|Pigeon now using opportunistic SIMD]] by [[Stuart Riffle]], [[CCC]], April 11, 2016 * [[http://www.talkchess.com/forum/viewtopic.php?t=59900|Pigeon 1.37 released]] by [[Stuart Riffle]], [[CCC]], April 19, 2016 * [[http://www.talkchess.com/forum/viewtopic.php?t=61299|Pigeon 1.5.0 released]] by [[Stuart Riffle]], [[CCC]], September 01, 2016 * [[http://www.talkchess.com/forum/viewtopic.php?t=61925|Pigeon is now running on the GPU]] by [[Stuart Riffle]], [[CCC]], November 02, 2016 » [[GPU]] =External Links= ==Chess Engine== * [[https://github.com/StuartRiffle/pigeon|Pigeon on GitHub]] * [[http://www.computerchess.org.uk/ccrl/404/cgi/engine_details.cgi?print=Details&eng=Pigeon%201.37%2064-bit|Pigeon 1.37 64-bit]] from [[CCRL|CCRL 40/40]] ==Misc== * [[https://en.wikipedia.org/wiki/Pigeon_%28disambiguation%29|Pigeon (disambiguation) from Wikipedia]] * [[https://en.wikipedia.org/wiki/Columbidae|Columbidae from Wikipedia]] * [[https://en.wikipedia.org/wiki/Domestic_pigeon|Domestic pigeon from Wikipedia]] * [[https://en.wikipedia.org/wiki/Doves_as_symbols|Doves as symbols from Wikipedia]] * [[https://en.wikipedia.org/wiki/Fancy_pigeon|Fancy pigeon from Wikipedia]] * [[https://en.wikipedia.org/wiki/Homing_pigeon|Homing pigeon from Wikipedia]] * [[https://en.wikipedia.org/wiki/Pigeon_intelligence|Pigeon intelligence from Wikipedia]] * [[https://en.wikipedia.org/wiki/Pigeon_post|Pigeon post from Wikipedia]] * [[https://en.wikipedia.org/wiki/Pigeon_racing|Pigeon racing from Wikipedia]] =References= <references /> =What links here?= [[include page="Pigeon" component="backlinks" limit="30"]] **[[Engines|Up one level]]**