p4wn

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**p4wn** is a quite small public domain engine written by [[Douglas Bagnall]] in [[JavaScript]]. It runs in [[https://en.wikipedia.org/wiki/Web_browser|web browsers]] and standalone JavaScript engines (though less usefully there, without any [[User Interface|UI]]). The first version was released in 2002 as an entry in a 5k web page competition, and its source code was incomprehensibly succinct. It used a sort of [[Principal Variation Search|principal variation search]] and a [[Piece-Square Tables|piece-square table]] [[Oracle|oracle]]. In 2012 it was rewritten for clarity and for performance in modern JavaScript engines. It now uses a plain [[Alpha-Beta|alpha-beta]] search and more sophisticated piece-square tables. p4wn plays by all the rules, though it never claims a draw, just makes the offer and tries to avoid draws if it thinks it is winning. It likes to make rash sacrifices when ahead.

=Forum Posts=
* [[http://www.talkchess.com/forum/viewtopic.php?t=64969|ChessGUI (current version) and JavaScript engines part I]] by [[Norbert Raimund Leisner]], [[CCC]], August 23, 2017 » [[ChessGUI]]

=External Links=
* [[http://p4wn.sf.net|p4wn]]
* [[https://github.com/douglasbagnall/p4wn|GitHub - douglasbagnall/p4wn: a smallish turn-of-the-century javascript chess engine]]

=What links here?= 
[[include page="p4wn" component="backlinks" limit="20" ]]
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