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an [[:Category:Open Source Engines|open source chess engine]] under the [[Free Software Foundation#GPL|GNU General Public License]] <ref>[http://web.archive.org/web/20070607151211/www.brucemo.com/compchess/gerbil/index.htm Gerbil] by [[Bruce Moreland]] archived by the [https://en.wikipedia.org/wiki/Wayback_Machine Wayback Machine]</ref>, written by [[Bruce Moreland]], written for educational purposes. It has a decent search ([[Null Move Pruning|null move pruning]], [[Transposition Table|hash tables]]) but a rudimentary [[Evaluation|evaluation]] <ref>[http://web.archive.org/web/20070602233810/http://www.seanet.com/~brucemo/gerbil/release.txt Release Notes 02] archived by the [https://en.wikipedia.org/wiki/Wayback_Machine Wayback Machine]</ref>.