Phalanx

**[[Home]] * [[Engines]] * Phalanx**
|| [[image:Greek_Phalanx.jpg link="https://en.wikipedia.org/wiki/File:Greek_Phalanx.jpg"]] ||~   || **Phalanx**,
an [[Open Source Engines|open source chess engine]], originally released by a Czech student [[Dušan Dobeš]] under [[Free Software Foundation#GPL|GPL]], also available as [[ChessBase#YoungTalents|Young Talent]] by [[ChessBase]] running under the [[Fritz#FritzGUI|Fritz6 GUI]]. In about 2000 the project has been abandoned <ref>[[http://groups.google.com/group/rec.games.chess.computer/browse_frm/thread/a56fb4fa7b0d427b|Phalanx is dead?]] by [[Tord Romstad]], [[Computer Chess Forums|rgcc]], March 27, 2002</ref> , but it was resurrected in 2006 by [[José de Paula Rodrigues]] <ref>[[http://groups.google.com/group/rec.games.chess.computer/browse_frm/thread/3819371b750533f1#|Phalanx XXII - Reborn]] by [[José de Paula Rodrigues]], [[Computer Chess Forums|rgcc]], January 19, 2006</ref> <ref>[[http://sourceforge.net/users/espinafre/|José de Paula]] from [[http://sourceforge.net/|SourceForge.net]]</ref>. In October 2014, after fourteen years and nine months, Phalanx XXIII was released by [[Dušan Dobeš]] <ref>[[http://www.talkchess.com/forum/viewtopic.php?t=54098|Phalanx XXIII]] by [[Dušan Dobeš]], [[CCC]], October 20, 2014</ref>. ||
|| Phalanx formation <ref>An [[http://edsitement.neh.gov/edsitements-persian-wars-resource-pages#node-20463|EDSITEment-reconstructed]] Greek phalanx based on sources from [[https://en.wikipedia.org/wiki/Perseus_Project|The Perseus Project]], [[https://en.wikipedia.org/wiki/Phalanx_formation|Phalanx formation from Wikipedia]]</ref> ||~   ||^   ||
[[toc]]
=Description=
Phalanx's board is [[Board Representation|represented]] by a [[10x12 Board|10x12 mailbox]] with [[Piece-Lists|piece-lists]]. The [[Search|search]] uses [[Principal Variation Search|PVS]] with [[Transposition Table|transposition table]] inside an [[Iterative Deepening|iterative deepening]] centiply framework for [[Extensions#FractionalExtensions|fractional extensions]] and [[Reductions|reductions]] without [[Aspiration Windows|aspiration windows]], performing state of the art [[Null Move Pruning|null move pruning]], [[Late Move Reductions|late move reductions]] and [[Futility Pruning|futility pruning]] near the tips. Phalanx pioneered in [[Tapered Eval|tapered eval]] and speculatively computes both [[Endgame|endgame]] and [[Middlegame|middlegame]] [[Score|scores]] to balance them by total [[Material|material]]. This prevents [[Evaluation Discontinuity|evaluation discontinuity]] when searching a position on the edge of middlegame and endgame. The [[Evaluation|static evaluation]] first extracts knowledge and prepares a [[Color Flipping|color flipped]] board, and applies that knowledge in a second pass using the flipped board to do stuff for both sides with the same color independent code.

=Quotes= 
by [[Dušan Dobeš]] from [[Computer Chess Forums|rgcc]], July 16, 1998 <ref>[[http://groups.google.com/group/rec.games.chess.computer/browse_frm/thread/7ab1751bddacb97a#|Phalanx ?]] by [[Dušan Dobeš]], [[Computer Chess Forums|rgcc]], July 16, 1998</ref> :
|| {{Phalanx is my hobby project. It started in March 1997. It's developed under [[Linux]] and [[Free Software Foundation#GCC|GCC]], I also prepared binary distribution for [[Windows|Win32]] with latter versions. Licensing policy is GPL (free and in sources). Interface is xboard/winboard/RoboFICS compatible. It plays on FICS as 'pikozrout', it's current blitz rating is 2380, standard 2210.}} ||

=See also=
* [[Various Classifications#Military|Military]]

=Forum Posts= 
==1997 ...==
* [[http://groups.google.com/group/rec.games.chess.computer/browse_frm/thread/dba5dc4e35dae67|Phalanx III - chess playing program for Linux]] by [[Dušan Dobeš]], [[Computer Chess Forums|rgcc]], July 08, 1997
* [[http://groups.google.com/group/rec.games.chess.computer/browse_frm/thread/7ab1751bddacb97a#|Phalanx ?]] by [[Dušan Dobeš]], [[Computer Chess Forums|rgcc]], July 16, 1998
==2000 ...==
* [[http://groups.google.com/group/rec.games.chess.computer/browse_frm/thread/a56fb4fa7b0d427b|Phalanx is dead?]] by [[Tord Romstad]], [[Computer Chess Forums|rgcc]], March 27, 2002
* [[http://groups.google.com/group/rec.games.chess.computer/browse_frm/thread/3819371b750533f1#|Phalanx XXII - Reborn]] by [[José de Paula Rodrigues]], [[Computer Chess Forums|rgcc]], January 19, 2006
==2010 ...==
* [[http://www.talkchess.com/forum/viewtopic.php?t=42398|Phalanx source code]] by [[Carlos Pesce]], [[CCC]], February 09, 2012
* [[http://www.talkchess.com/forum/viewtopic.php?t=52127|New Phalanx code]] by [[Steven Atkinson]], [[CCC]], April 26, 2014
* [[http://www.talkchess.com/forum/viewtopic.php?t=54098|Phalanx XXIII]] by [[Dušan Dobeš]], [[CCC]], October 20, 2014
* [[http://www.talkchess.com/forum/viewtopic.php?t=54744|Phalanx XXIV]] by [[Dušan Dobeš]], [[CCC]], December 24, 2014
* [[http://www.talkchess.com/forum/viewtopic.php?t=60019|Phalanx XXV]] by [[Dušan Dobeš]], [[CCC]], May 01, 2016

=External Links= 
==Chess Engine==
* [[http://sourceforge.net/projects/phalanx/files/|Phalanx Chess at SourceForge.net]]
* [[http://sourceforge.net/projects/phalanx/|Phalanx Chess | Free software downloads at SourceForge.net]]
* [[http://phalanx.sourceforge.net/|Phalanx homepage | SourceForge.net]]
* [[http://www.computerchess.org.uk/ccrl/404/cgi/compare_engines.cgi?family=Phalanx&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|Phalanx]] in [[CCRL|CCRL 40/4]]
==Misc==
* [[https://en.wiktionary.org/wiki/phalanx|phalanx - Wiktionary]]
* [[https://en.wikipedia.org/wiki/Phalanx|Phalanx disambiguation page from Wikipedia]]
* [[https://en.wikipedia.org/wiki/Phalanx_formation|Phalanx formation from Wikipedia]]
* [[https://soundcloud.com/new-phalanx|New Phalanx]] Formation Live feat. [[http://www.newphalanx.de/band/epaminondas-ladas-git/|Epaminondas Ladas]], [[https://en.wikipedia.org/wiki/YouTube|YouTube]] Video
> [[media type="youtube" key="We68a54qqvo"]]

=References= 
<references />
=What links here?= 
[[include page="Phalanx" component="backlinks" limit="60"]]
**[[Engines|Up one Level]]**