Editing GNU Chess (section)

{{Short description|Free software chess engine}}
{{Use dmy dates|date=March 2023}}
{{Infobox software
 | name = GNU Chess
 | logo = Heckert GNU white.svg
 | screenshot = [[Image:XBoard GNUChess.png|250px|GNU Chess 6.0.0 on XBoard 4.5.1]]
 | caption = GNU Chess 6.0.0 running with the [[XBoard]] front end, v. 4.1.5.
 | developer = [[GNU Project]]
 | released = {{Start date and age|1984}}
 | latest release version = {{wikidata|property|preferred|references|edit|Q494713|P348|P548=Q2804309}}
 | latest release date = {{wikidata|qualifier|preferred|single|Q494713|P348|P548=Q2804309|P577}}
 | latest preview version = {{wikidata|property|preferred|references|edit|Q494713|P348|P548=Q51930650}}
 | latest preview date = {{wikidata|qualifier|preferred|single|Q494713|P348|P548=Q51930650|P577}}
 | operating system = [[Linux]], [[Unix]], [[macOS]], [[Microsoft Windows|Windows]]
 | genre = [[Computer chess]]
 | license = 2010{{efn|GPL-3.0-or-later since 2010-01-03, version 5.08.}}: [[GNU General Public License|GPL-3.0-or-later]]<br />1992{{efn|GPL-2.0-or-later since 1992-05-30, version 4.0.43.}}: [[GNU General Public License|GPL-2.0-or-later]]<br />1986: Chess-GPL{{efn|GNU Chess General Public License}}<ref>{{cite web|url=https://opensource.apple.com/source/Chess/Chess-49/gnuchess.subproj/COPYING|title=GNU Chess General Public License|date=1986}}</ref><ref>{{cite newsgroup|url=https://groups.google.com/g/ont.general/c/DA4P3edfSAI|title=yetti's Christmas/New Year goodies (gnu chess)|last=Yigit|first=Ozan|date=1986-12-17|newsgroup=ont.general}}</ref>
 | website = {{URL|www.gnu.org/software/chess/}}
}}
{{Chess programming series}}
'''GNU Chess''' is a [[free software]] [[chess engine]] and [[command-line interface]] [[chessboard]]. The goal of [[GNU]] Chess is to serve as a basis for research, and as such it has been used in numerous contexts.

GNU Chess is free software, licensed under the terms of the [[GNU General Public License#Version 3|GNU General Public License version 3]] or any later version, and is maintained by collaborating developers. As one of the earliest [[computer chess]] programs with full [[source code]] available, it is one of the oldest for [[Unix]]-based systems and has since been [[Porting|ported]] to many other [[Computing platform|platforms]].