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'''XBoard''' is a graphical user interface for the [[Chess Engine Communication Protocol]] running under the [[Unix]] (Posix) operating system based on the [https://en.wikipedia.org/wiki/X_Window_System X Window System], originally developed by [[Dan Sears]] and [[Chris Sears]] as a chess [[GUI]] for [[GNU Chess]] only <ref>[http://groups.google.com/group/gnu.chess/browse_frm/thread/28d5826a078d091d xboard v1.2] by [[Dan Sears]], [[GNU Chess#NewsGroup|gnu.chess]], June 14, 1991</ref>. In 1991 [[Tim Mann]] took over, became the main developer and he continued developing it parallelly with [[WinBoard]] <ref>[http://home.hccnet.nl/h.g.muller/engine-intf.html#4 Chess Engine Communication Protocol - 4. How it got this way]</ref> <ref>[http://tim-mann.org/history.html XBoard Project History]</ref>. In Fall 2013, [[Joshua Pettus]] managed to port XBoard to [[Mac OS|MAC OS X]] using the native [https://en.wikipedia.org/wiki/Quartz_%28graphics_layer%29 Quarz Graphics layer] <ref>[http://www.talkchess.com/forum/viewtopic.php?t=49729 OSX Xboard 4.7.2 .app] by [[Joshua Pettus]], [[CCC]], October 16, 2013</ref> <ref>[http://hiarcs.net/forums/viewtopic.php?t=6492 XBoard native Mac App] by [[Harm Geert Muller]], [[Computer Chess Forums|Hiarcs Forum]], December 18, 2013</ref>. When [[Harm Geert Muller]] took over the project, he focused on [[WinBoard]] only and XBoard code was abandoned since . Users on Unix and Unix-like systems should use the X Window System to run the program<ref>That statement seems wrong to me, see [httphttps://hgmwww.nubatignu.netorg/cgi-binsoftware/gitweb.cgi?p=xboard.git;a=summary hgm.nubati.net Git - xboard.git/summary]</ref>.