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a series of chess programs published by [[ChessBase]], until Fritz '''13''' the engine developed by primary author [[Frans Morsch]] and [[Mathias Feist]], Deep Fritz '''14''' released in November 2013 by [[Gyula Horváth]] <ref>[http://www.talkchess.com/forum/viewtopic.php?t=50149 New Fritz author?] by John Hartmann, [[CCC]], November 19, 2013</ref>, and Fritz '''15''' in November 2015 by [[Vasik Rajlich]] <ref>[https://shop.chessbase.com/en/products/fritz_15_english Fritz 15 - English Version], [[ChessBase|ChessBase Shop]]</ref> <ref>[http://en.chessbase.com/post/fritz-15-engine-questions-and-answers Fritz 15 engine - questions and answers] by [[Albert Silver]], [[ChessBase|ChessBase News]], January 04, 2016</ref>. Fritz 1-13 were based on Frans Morsch's program [[Quest]], and was first marketed by ChessBase in 1991 as [[MS-DOS]] program with its own [[GUI|Graphical User Interface]] <ref>[https://en.chessbase.com/post/christmas-dinner-on-a-train-meet-the-chebase-team Christmas dinner on a train – meet the ChessBase team] from [[ChessBase|ChessBase News]], December 23, 2003</ref> . Since version 4, released in 1996, Fritz ran on [[Windows]], and is until today one the world’s most popular and successful chess programs. At the [[WCCC 1995]], Fritz became World Computer Chess Champion, winning a [[WCCC 1995#DBlueFritz|notable game]] versus [[Deep Blue]] [https://www.game-ai-forum.org/icga-tournaments/program.php?id=349 prototype] <ref>[[Fabian Mäser]] ('''1995'''). ''Fritz vs. [[Deep Blue]]: Opening Book vs, Opening Book''. [[Computer Chess Reports|Computer Chess Reports Vol. 5 No. 2]] pp. 22, [[WCCC 1995]]</ref> and the [[WCCC 1995#Playoff|playoff]] <ref>[https://www.game-ai-forum.org/icga-tournaments/round.php?tournament=29&round=6&id=1 Shatin 1995, Chess, Round 6, Game 1]</ref> against [[Star Socrates]].