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a family of chess engines by [[Matthias Lüscher]], written in [[Cpp|C++]], first released in April 1998. The free native Chessterfield comes with an own [[GUI]], the experimental [[WinBoard]] compliant ChessterfieldCL along with its [[Learning|learning utility]] ChessterfieldEN is [[:Category:Open Source Engines|open source]] published under the [[Free Software Foundation#GPL|GNU General Public Licence V2]] <ref>[http://home.datacomm.ch/m.luescher/download_cl.html ChessterfieldCL Download]</ref>. Chessterfield applies [[Alpha-Beta|alpha-beta]] with [[Transposition Table|transposition table]], [[Null Move Pruning|null move pruning]], [[Razoring|razoring]] and various [[Extensions|extensions]] inside an [[Aspiration Windows|aspirated]] [[Iterative Deepening|iterative deepening]] loop.