Elephant

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|| [[image:320px-Elefantengebäude_-Maximilian_Park-2.JPG link="https://commons.wikimedia.org/wiki/File:Elefantengeb%C3%A4ude_-Maximilian_Park-2.JPG"]] ||~   || **Elephant**,
a [[WinBoard]] compatible chess engine written by [[Harald Lüßen]] in [[Cpp|C++]], first released in March 2004 <ref>[[http://wbec-ridderkerk.nl/html/details1/Elephant.html|Elephant]] from [[WBEC|WBEC Ridderkerk]]</ref> . The name was chosen due to the connection with pieces in [[https://en.wikipedia.org/wiki/Chaturanga|Chaturanga]], [[Chinese Chess]] and chess, such as [[Rook|rook]] and [[Bishop|bishop]] <ref>[[http://www.stmintz.com/ccc/index.php?id=160251|Re: Elephant]] by [[Eugene Nalimov]], [[CCC]], March 26, 2001</ref> , because [[https://en.wikipedia.org/wiki/Elephant|elephants]] are known to be intelligent, and further due its author's weight <ref>[[http://www.stmintz.com/ccc/index.php?id=354776|Elephant 1.00, a new winboard engine]] by [[Harald Lüßen]], [[CCC]], March 15, 2004</ref> . ||
|| The [[http://de.wikipedia.org/wiki/Glaselefant|Glas Elephant]] <ref>The [[http://de.wikipedia.org/wiki/Glaselefant|Glas Elephant]], [[https://de.wikipedia.org/wiki/Maximilianpark|Maximilianpark]], [[https://en.wikipedia.org/wiki/Hamm|Hamm]], [[https://en.wikipedia.org/wiki/North_Rhine-Westphalia|North Rhine-Westphalia]], Germany,  [[Arts#IndustrialHeritageTrail|The Industrial Heritage Trail]]</ref> in [[https://en.wikipedia.org/wiki/Hamm|Hamm]] <ref>[[http://www.hammwiki.de/wiki/Elefantenparade|Elefantenparade – HammWiki]]</ref> ||~   ||^   ||
[[toc]]
=Description= 
Elephant applies [[Principal Variation Search|PVS]] [[Alpha-Beta|alpha-beta]] with [[Transposition Table|transposition table]], [[Quiescence Search|quiescence]], [[Null Move Pruning#AdaptiveNullMovePruning|adaptive null move pruning]], [[Internal Iterative Deepening|IID]], [[Razoring|razoring]], [[Futility Pruning|futility pruning]] and various [[Extensions|extensions]], embedded inside an [[Depth#FractionalPlies|fractional ply]] [[Iterative Deepening|iterative deepening]] framework. [[Move Ordering|Move ordering]] at the [[Root|root]] is based on [[Node|node count]], and otherwise considers [[Hash Move|hash move]] including [[Principal variation|principle variation]], [[Static Exchange Evaluation|static exchange evaluation]], [[Killer Heuristic|killer-]] and [[History Heuristic|history heuristic]]. [[Evaluation]] might be [[Lazy Evaluation|lazy]] and takes [[Material|material]], [[Pawn Hash Table|cached]] [[Pawn Structure|pawn structure]], [[King Safety|king safety]], [[Piece-Square Tables|piece-squares tables]], [[Mobility|mobility]] and multiple other terms into account. Elephant was used as testbed to compare various [[Bitboards|bitboard]] techniques in generating [[Sliding Piece Attacks|sliding piece attacks]] <ref>[[http://www.talkchess.com/forum/viewtopic.php?topic_view=threads&p=140111&t=16002|Re: BitBoard Tests Magic v Non-Rotated 32 Bits v 64 Bits]] by [[Harald Lüßen]], [[CCC]], August 24, 2007</ref>, in particular [[Exploding Bitboards|Exploding-]] and [[Sherwin Bitboards]].

=See also= 
* [[Arimaa]]
* [[Various Classifications#ChessPieces|Chess Pieces]]
* [[Chinese Chess]]
* [[Hannibal]]
* [[Jumbo]]
* [[Various Classifications#Mammal|Mammal]]

=Forum Posts= 
* [[http://www.stmintz.com/ccc/index.php?id=354776|Elephant 1.00, a new winboard engine]] by [[Harald Lüßen]], [[CCC]], March 15, 2004
* [[http://www.stmintz.com/ccc/index.php?id=359543|Elephant and pondering]] by [[Olivier Deville]], [[CCC]], April 11, 2004 » [[Pondering]]

=External Links= 
==Chess Engine== 
* [[http://wbec-ridderkerk.nl/html/details1/Elephant.html|Elephant]] from [[WBEC|WBEC Ridderkerk]]
* [[http://www.computerchess.org.uk/ccrl/404/cgi/engine_details.cgi?print=Details&eng=Elephant%201.06|Elephant 1.06]] in [[CCRL|CCRL 40/4]]

==Chess and Variants== 
* [[http://history.chess.free.fr/india.htm|Indian Chess Sets]]
* [[https://en.wikipedia.org/wiki/Chaturanga|Chaturanga from Wikipedia]]
* [[https://en.wikipedia.org/wiki/Xiangqi#Pieces|Xiangqi - Pieces from Wikipedia]]
* [[https://en.wikipedia.org/wiki/Elephant_Gambit|Elephant Gambit from Wikipedia]]
* [[http://www.game-ai-forum.org/icga-tournaments/program.php?id=113|Elephant]], the [[Chinese Chess]] engine by [[Shun-Chin Hsu]], [[Shun-Shii Lin]], [[Shih-Chieh Huang]] et al.
==Misc== 
* [[https://en.wikipedia.org/wiki/Elephant|Elephant from Wikipedia]]
* [[https://en.wikipedia.org/wiki/Elephant_%28disambiguation%29|Elephant (disambiguation) from Wikipedia]]
* [[https://en.wikipedia.org/wiki/Blind_men_and_an_elephant|Blind men and an elephant - Wkipedia]]
* [[https://en.wikipedia.org/wiki/War_elephant|War elephant from Wikipedia]]
* [[Videos#KingCrimson|King Crimson]] - [[http://www.elephant-talk.com/wiki/ETWiki_Home|Elephant Talk]], live on [[https://en.wikipedia.org/wiki/Fridays_%28TV_series%29|Fridays]] (1982), [[https://en.wikipedia.org/wiki/YouTube|YouTube]] Video
> lineup: [[https://en.wikipedia.org/wiki/Tony_Levin|Tony Levin]], [[Videos#AdrianBelew|Adrian Belew]], [[Videos#BillBruford|Bill Bruford]], [[Videos#RobertFripp|Robert Fripp]]
> [[media type="youtube" key="GTQrlDzqUCA" width="560"]]

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