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p4wn is a quite small public domain engine written by Douglas Bagnall in Javascript. It runs in web browsers and standalone javascript engines (though less usefully there, without any 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 and a piece-square table oracle. In 2012 it was rewritten for clarity and for performance in modern javascript engines. It now uses a plain 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.

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