Xpdnt

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**[[Home]] * [[Engines]] * Xpdnt**

**Xpdnt**,
an [[Open Source Engines|open source chess engine]] by [[David B. Weller]], written in [[C]] and compliant to the [[Chess Engine Communication Protocol]]. Already announced in 2005, Xpdnt was first released in April 2006 <ref>[[http://www.open-aurec.com/wbforum/viewtopic.php?f=4&t=4664&p=24174|Beta Testers needed]] by [[David B. Weller]], [[Computer Chess Forums|Winboard Forum]], April 16, 2006</ref>, the so far latest update appeared in October 2009 <ref>[[http://www.talkchess.com/forum/viewtopic.php?t=30539|The Gaviota Saga]] by [[Graham Banks]], [[CCC]], November 09, 2009</ref>. 

=Features=
<ref>based on the sources [[http://www.opraus.com/ai/|Xpdnt: Free chess engine]]</ref>
==[[Board Representation]]==
* [[Vector Attacks|16x16 Vector Attacks]]
* [[Piece-Lists]]
==[[Search]]==
* [[Iterative Deepening]]
* [[Aspiration Windows]]
* [[Principal Variation Search]]
* [[Transposition Table]]
* [[Selectivity]]
** [[Quiescence Search]]
** [[Delta Pruning]]
** [[Futility Pruning]]
** [[Mate Distance Pruning]]
** [[Null Move Pruning]]
** [[Razoring]]
** [[Check Extensions]]
** [[One Reply Extensions]]
** [[Mate Threat Extensions]]
** [[Passed Pawn Extensions|Pawn to 7th Rank Extensions]]
* [[Move Ordering]]
** [[Killer Heuristic]]
** [[History Heuristic]]
** [[Internal Iterative Deepening]]
** [[Static Exchange Evaluation]]
==[[Evaluation]]==
* [[Material]]
* [[Trapped Pieces]]
* [[Outposts]]
* [[Mobility]]
* [[Piece-Square Tables]]
* [[Pawn Structure]]
** [[Passed Pawn|Passed Pawns]]
** [[Weak Pawns]]
* [[King Safety]]
** [[King Safety#PawnShield|Pawn Shield]]
** [[King Safety#PawnStorm|Pawn Storm]]
** [[King Safety#KingTropism|Tropism]]
** [[King Safety#SquareControl|Square Control]]
** [[Rook]] or [[Queen]] on [[Open file|open files]] near the [[King]]
** [[King Safety#Scaling|Scaling by Material]]
* [[King Centralization]] in the [[Endgame]]

=See also=
* [[GES]]

=Forum Posts=
==2005 ...==
* [[http://www.open-aurec.com/wbforum/viewtopic.php?f=4&t=3370&p=16850|NPS]] by [[David B. Weller]], [[Computer Chess Forums|Winboard Forum]], August 27, 2005
* [[http://www.open-aurec.com/wbforum/viewtopic.php?f=4&t=4664&p=24174|Beta Testers needed]] by [[David B. Weller]], [[Computer Chess Forums|Winboard Forum]], April 16, 2006
* [[http://www.open-aurec.com/wbforum/viewtopic.php?f=2&t=4927&p=25313|New version of Xpdnt]] by [[David B. Weller]], [[Computer Chess Forums|Winboard Forum]], June 02, 2006
* [[http://www.open-aurec.com/wbforum/viewtopic.php?f=2&t=5899&p=28499|XPDNT 061120 released]] by [[David B. Weller]], [[Computer Chess Forums|Winboard Forum]], November 20, 2006
* [[http://www.talkchess.com/forum/viewtopic.php?t=17186|xpdnt_071017 released]] by [[David B. Weller]], [[CCC]], October 17, 2007
* [[http://www.talkchess.com/forum/viewtopic.php?t=17880|Xpdnt 071115 win32 Intel compiler 10 p.g.o available]] by [[Jim Ablett]], [[CCC]], November 15, 2007
==2008 ...==
* [[http://www.talkchess.com/forum/viewtopic.php?t=19517|Xpdnt 080209]] by [[David B. Weller]], [[CCC]], February 10, 2008
* [[http://www.open-aurec.com/wbforum/viewtopic.php?f=2&t=7128&p=32732|Xpdnt 080209 by David B. Weller - Win32 JA build]] by [[Jim Ablett]], [[Computer Chess Forums|Winboard Forum]], February 10, 2008
* [[http://www.talkchess.com/forum/viewtopic.php?t=22395|Xpdnt_080716]] by [[David B. Weller]], [[CCC]], July 16, 2008
* [[http://www.talkchess.com/forum/viewtopic.php?t=23617|Xpdnt 080904]] by [[David B. Weller]], [[CCC]], September 10, 2008
* [[http://www.talkchess.com/forum/viewtopic.php?t=24275|Xpdnt 080927]] by [[David B. Weller]], [[CCC]], October 09, 2008
* [[http://www.talkchess.com/forum/viewtopic.php?t=28889|xpdnt 090704 released]] by [[David B. Weller]], [[CCC]], July 10, 2009
* [[http://www.open-aurec.com/wbforum/viewtopic.php?f=2&t=50482&p=191657|Xpdnt_091007 Released]] by [[David B. Weller]], [[Computer Chess Forums|Winboard Forum]], October 14, 2009
==2010 ...==
* [[http://www.talkchess.com/forum/viewtopic.php?t=35857|Xpdnt 091007 - CCRL 40/4 Result]] by [[Adam Hair]], [[CCC]], August 22, 2010

=External Links=
* [[http://www.opraus.com/ai/|Xpdnt: Free chess engine]]
* [[http://www.computerchess.org.uk/ccrl/404/cgi/engine_details.cgi?print=Details&each_game=1&eng=Xpdnt%20091007#Xpdnt_091007|Xpdnt 091007]] in [[CCRL|CCRL 40/4]]
* [[http://kirr.homeunix.org/chess/engines/Jim%20Ablett/XPDNT/|Index of /chess/engines/Jim Ablett/XPDNT]] compiled by [[Jim Ablett]], hosted by [[Kirill Kryukov]]
* [[http://www.lenardspencer.com/chess/JA-Bundle-Final/XPDNT/|Index of /chess/JA-Bundle-Final/XPDNT]]

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