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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 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 generationGeneration|move generation]] and [[Move Ordering|sorting]].
=Photos=
* [https://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]]
* [https://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 SimonrSimon]], [[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
