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an [[UCI]] compliant [[:Category:Open Source|open source chess engine]] written by [[Raimund Heid]] in [[C]], distributed under the [[Free Software Foundation#GPL|GNU General Public License GPL]]. Protector already started its life in early 2000 <ref>[http://www.schach-welt.de/schach/computerschach/interviews/raimund-heid Interview] with [[Raimund Heid]], by [[Frank Quisinsky]], [http://www.schach-welt.de/ Schachwelt.de], February 20, 2010 (German)</ref> , and over the time incorporated many public ideas and techniques known from other open source programs, notably [[Crafty]], [[Fruit]], [[Toga]], [[Glaurung]]/[[Stockfish]] and [[RobboLito]]. It can be compiled to run under [[Windows]], [[Linux]] and [[Mac OS]]. Protector is incorporated in the cluster chess project [[GridProtector]] by [[Kai Himstedt]] which had its debut at [[PT 49]].