Patzer

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**Patzer**,
a [[Chess Engine Communication Protocol]] compatible chess engine by [[Roland Pfister]], later versions were [[UCI]] compliant, featuring a [[Parallel Search|parallel search]] and own [[Endgame Bitbases|endgame bitbases]], and were able to play [[Chess960]] <ref>[[http://web.archive.org/web/20090430124900/http://www.superchessengine.com/patzer.htm|Patzer 3.80]], [[https://en.wikipedia.org/wiki/Wayback_Machine|Wayback Machine]]</ref>. Patzer is famous for solving the [[Behting Study]] <ref>[[http://www.rebel.nl/authors.htm|Meet the Authors -  PATZER,  Roland Pfister]] hosted by [[Ed Schroder|Ed Schröder]]</ref> and a special [[Draw|draw heuristic]] for checking sequences. Patzer was available as [[ChessBase#YoungTalents|Young Talent]] by [[ChessBase]] running under the [[Fritz#FritzGUI|Fritz6 GUI]] <ref>[[http://www.chessbase.com/support/support.asp?pid=100|Support - ChessBase, May 28th, 2000]] (dead link)</ref>. 

=Tournament Play=
Patzer played the [[WMCCC 1996]] in [[https://en.wikipedia.org/wiki/Jakarta|Jakarta]], the [[WMCCC 1997]] in [[https://en.wikipedia.org/wiki/Paris|Paris]], the [[WCCC 1999]] in  [[https://en.wikipedia.org/wiki/Paderborn|Paderborn]], and the [[Chess960CWC 2005]] and [[Chess960CWC 2006]] in [[https://en.wikipedia.org/wiki/Mainz|Mainz]]. Further, Patzer was active over the board at [[IPCCC|IPCCCs]], the [[SCCC 1998|5th Spanish Open Computer Chess Championship]], [[Dutch Open Computer Chess Championship|Dutch Open Computer Chess Championships]], [[International CSVN Tournament|International CSVN Tournaments]], and the [[BELCT 2001]].

=Descriptions=
<ref>[[http://www.game-ai-forum.org/icga-tournaments/program.php?id=19|Patzer's ICGA Tournaments]]</ref> 
==1997==
|| {{Patzer uses state of the art methods as [[Null Window|minimal window]], [[Hash Table|hash tables]], [[History Heuristic|history table]], [[Static Exchange Evaluation|static exchange evaluation]] with [[Bitboards|bitboards]], various [[Extensions|extensions]], [[Null Move Pruning|recursive nullmove]] . It has small databases for [[KPK]] and [[KPKP]] with blocked pawns to decide if it is a win or not. Additionally it can use [[Ken Thompson|Thompson's]] Endgame CDs at [[Ply|ply]] 0.}}

{{At the moment I am working on including [[Endgame Tablebases|endgame table base]] support. Patzer has a text interface a well as [[GUI|GUIs]] for [[MS-DOS|DOS]], [[Windows]], OS/2 and [[X11]]. It can read/write [[Portable Game Notation|PGN]] and [[Extended Position Description|EPD]] files. It has an Interface for [[Auto232|Autoplayer232]] and for [[XBoard]]/[[WinBoard]]. It has knowledge of the [[Wrong color Bishop and Rook Pawn|"wrong" bishop]] in endgames. A [[https://en.wikipedia.org/wiki/Hypertext|Hypertext]] User Online Manual is available in German for [[MS-DOS|DOS]], [[Windows]], OS/2 and [[Unix]].}} ||

==1999==
|| {{Patzer uses the standard [[Alpha-Beta|alpha-beta]] [[Principal Variation Search|PVS]] search, enhanced by [[Hash Table|hashtables]] (4 retries replacement scheme), [[Null Move Pruning|recursive nullmove]] ([[Depth Reduction R|R]]=2) with verification if only one piece present, special [[Pruning|pruning]] heuristic for [[Node Types#ALL|ALL-nodes]], various [[Extensions|extensions]]. It also uses a special [[Material Hash Table|material hash table]] to adjust the [[Material|material]] balance values for certain [[Endgame|endgames]] where the "usual" values do not apply. It values [[King Safety|king safety]] and [[Passed Pawn|passed pawns]] rather high (too high?). It is a [[Incremental Updates|incremental]] [[Bitboards|bitboard]] program with [[Attack and Defend Maps|attack tables]] that are also used during [[Move generation|move generation]] and [[Move Ordering|sorting]].}} ||

=Photos=
|| [[image:FrankRoland.jpg width="570" link="http://www.quarkchess.de/csvn2001/body_index.html"]] ||
|| Patzer team [[Frank Quisinsky]] and [[Roland Pfister]] at [[ICT 2001]] <ref>[[http://www.quarkchess.de/csvn2001/body_index.html|1st International CSVN-Tournament 2001]] by [[Thomas Mayer]], [[ICT 2001]]</ref> ||

=Namesake=
* [[Patzer (K)|Patzer]] by [[Werner Koch]] and [[Thomas Schäfer]]

=Forum Posts=
==1998 ...==
* [[http://www.stmintz.com/ccc/index.php?id=20150|Yes, Patzer really seem to be quite something...]] by [[Fernando Villegas]], [[CCC]], June 07, 1998
* [[http://www.open-aurec.com/wbforum/viewtopic.php?f=18&t=30531&p=115980|Diepeveen Attack !]] by [[Frank Quisinsky]], [[Computer Chess Forums|Winboard Forum]], November 11, 1999
==2000 ...==
* [[http://www.stmintz.com/ccc/index.php?id=165577|Patzer]] by [[Ingo Bauer]], [[CCC]], April 23, 2001
* [[http://www.stmintz.com/ccc/index.php?id=169171|Re: 1 Hour CCR Test by IM Larry Kaufmann / Patzer 3.51]] by [[Roland Pfister]], [[CCC]], May 11, 2001 » [[CCR One Hour Test]]
* [[http://www.stmintz.com/ccc/index.php?id=186009|Goliath Light, Gromit, Patzer, SOS, etc. commercially sold]] by [[Theo van der Storm]], [[CCC]], August 28, 2001
* [[http://www.open-aurec.com/wbforum/viewtopic.php?f=18&t=35220&p=133316|Is there a Tournament book for Patzer?]] by [[Günther Simonr]], [[Computer Chess Forums|Winboard Forum]], December 05, 2001
* [[http://www.open-aurec.com/wbforum/viewtopic.php?f=18&t=42137&p=160957|Patzer 3.61 UCI vs 3.11 CB = 23 - 15]] by Brice Boissel, [[Computer Chess Forums|Winboard Forum]], April 08, 2003
* [[http://www.open-aurec.com/wbforum/viewtopic.php?f=18&t=44653&p=170186|Patzer_299zt]] by Telmo Escobar, [[Computer Chess Forums|Winboard Forum]], October 18, 2003
* [[http://www.stmintz.com/ccc/index.php?id=370997|Any programs besides Yace and Patzer that can use bitbase files]] by [[Dann Corbit]], [[CCC]], June 17, 2004 » [[Endgame Bitbases]], [[Yace]]
==2010 ...==
* [[http://www.talkchess.com/forum/viewtopic.php?t=35320|STS [1-10] Patzer 3.80]] by [[Swaminathan Natarajan|Swaminathan]], [[CCC]], July 06, 2010 » [[Strategic Test Suite]]

=External Links=
==Chess Engine==
* [[http://www.game-ai-forum.org/icga-tournaments/program.php?id=19|Patzer's ICGA Tournaments]]
* [[http://web.archive.org/web/20090430124900/http://www.superchessengine.com/patzer.htm|Patzer 3.80]], [[https://en.wikipedia.org/wiki/Wayback_Machine|Wayback Machine]]
* [[http://www.rebel.nl/authors.htm|Meet the Authors -  PATZER,  Roland Pfister]] hosted by [[Ed Schroder|Ed Schröder]]
* [[http://www.computerchess.org.uk/ccrl/4040/cgi/engine_details.cgi?print=Details&eng=Patzer%203.80|Patzer 3.80]] in [[CCRL|CCRL 40/40]]
==Misc==
* [[https://en.wiktionary.org/wiki/Patzer|Patzer - Wiktionary]]
> [[https://en.wiktionary.org/wiki/patzer|patzer - Wiktionary]]
* [[https://www.chess.com/blog/Osokor/patzer-chess-slang|Patzer - derogatory description]] from [[https://en.wikipedia.org/wiki/Chess.com|Chess.com]]
* [[http://www.chessvideos.tv/chess-opening-database/search/Patzer-Opening|Patzer Opening - Chess Opening Database]]

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