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an [[UCI]] compliant [[:Category:Open Source Engines|open source chess engine]] by [[Jonathan Rosenthal]], written in [[Cpp|C++]], released on January 08, 2018 under the terms of [[Free Software Foundation#GPL|GPL Version 3]]. Winter is inspired by [[Learning|machine learning]] techniques, as applied in [[Move Ordering|move ordering]] and in particular in [[Evaluation|evaluation]], and heavily relies on [https://en.wikipedia.org/wiki/Template_(C%2B%2B) C++ templates] but not on any library aside from [https://en.wikipedia.org/wiki/Standard_Template_Library STL] as it comes with its own implementations for [https://en.wikipedia.org/wiki/Statistics statistics] <ref>[https://github.com/rosenthj/Winter/blob/master/src/learning/statistics.h Winter/statistics.h at master · rosenthj/Winter · GitHub]</ref> and [https://en.wikipedia.org/wiki/Linear_algebra linear algebra] <ref>[https://github.com/rosenthj/Winter/blob/master/src/learning/linear_algebra.h Winter/linear_algebra.h at master · rosenthj/Winter · GitHub]</ref>. Winter started its life in 2016 as a group project at [[ETH Zurich]] in a course on parallel computing along with Jonas Kuratli and Jonathan Maurer - the current release with Jonathan Rosenthal as sole author has removed the parallel portion of the code <ref>[http://www.talkchess.com/forum/viewtopic.php?t=66266 Winter Released] by [[Jonathan Rosenthal]], [[CCC]], January 08, 2018</ref>. It started to play on-line at [[Harm Geert Muller|HGM's]] [[Online Engine Blitz Tourneys]] in April 2017 <ref>[http://www.talkchess.com/forum/viewtopic.php?t=63777&start=9 Re: On-line engine blitz tourney April] by [[Harm Geert Muller]], [[CCC]], April 22, 2017</ref>.