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an experimental [[:Category:Open Source Engines|open source chess engine]] by [[Matthew Lai]] under the [[Free Software Foundation#GPL|GNU General Public License]], compliant to the [[Chess Engine Communication Protocol]], written in [[Cpp|C++11]] and based on [[Deep Learning|deep learning]], which is topic of his Master's thesis in August 2015 <ref>[[Matthew Lai]] ('''2015'''). ''Giraffe: Using Deep Reinforcement Learning to Play Chess''. M.Sc. thesis, [https://en.wikipedia.org/wiki/Imperial_College_London Imperial College London], [http://arxiv.org/abs/1509.01549v1 arXiv:1509.01549v1]</ref> <ref>[http://talkchess.com/forum/viewtopic.php?t=56913 *First release* Giraffe, a new engine based on deep learning] by [[Matthew Lai]], [[CCC]], July 08, 2015</ref> . Giraffe uses the [https://en.wikipedia.org/wiki/Eigen_%28C%2B%2B_library%29 Eigen linear algebra library] <ref>[http://eigen.tuxfamily.org/index.php?title=Main_Page Eigen, a C++ template library for linear algebra: matrices, vectors, numerical solvers, and related algorithms]</ref> , and [[Pradu Kannan|Pradyumna Kannan's]] [[Magic Bitboards|magic move generator]] <ref>[http://www.open-aurec.com/wbforum/viewtopic.php?f=4&t=5452 Fastest Magic Move Bitboard Generator ready to use] by [[Pradu Kannan]], [[Computer Chess Forums|Winboard Forum]], August 25, 2006</ref> <ref>[[Pradu Kannan|Pradyumna Kannan]] ('''2007'''). ''Magic Move-Bitboard Generation in Computer Chess''. [http://www.pradu.us/old/Nov27_2008/Buzz/research/magic/Bitboards.pdf pdf]</ref>. As employee of [[Google]] [[DeepMind]], Matthew Lai announced the discontinuation of the Giraffe project in January 2016 <ref>[http://www.talkchess.com/forum/viewtopic.php?t=59003 Death of Giraffe, but hopefully not ML in chess!] by [[Matthew Lai]], [[CCC]], January 21, 2016</ref>.