GNU Go
Free software program that plays Go with the user
title: "GNU Go" type: doc version: 1 created: 2026-02-28 author: "Wikipedia contributors" status: active scope: public tags: ["go-engines", "gnu-project-software", "open-source-video-games", "linux-games", "windows-games", "macos-games", "gp2x-games", "game-boy-advance-games"] description: "Free software program that plays Go with the user" topic_path: "technology/operating-systems" source: "https://en.wikipedia.org/wiki/GNU_Go" license: "CC BY-SA 4.0" wikipedia_page_id: 0 wikipedia_revision_id: 0
::summary Free software program that plays Go with the user ::
::data[format=table title="Infobox software"]
| Field | Value |
|---|---|
| name | GNU Go |
| screenshot | Gnugo screenshot.png |
| screenshot size | 250px |
| logo | [[Image:Gnugo-logo.png |
| developer | GNU Go Team |
| released | |
| latest release version | |
| latest release date | |
| latest preview version | |
| latest preview date | |
| operating system | Linux, Windows, macOS |
| genre | Computer Go |
| license | GNU GPLv3 |
| website | |
| :: |
::callout[type=note] a software re-creation of the Go board game ::
| name = GNU Go | screenshot = Gnugo screenshot.png | screenshot size = 250px | logo = [[Image:Gnugo-logo.png|Logo by Ebba Berggren]] | developer = GNU Go Team | released = | latest release version = | latest release date = | latest preview version = | latest preview date = | operating system = Linux, Windows, macOS | genre = Computer Go | license = GNU GPLv3 | website = GNU Go is a free software program by the Free Software Foundation that plays Go. Its source code is quite portable, and can be easily compiled for Linux, as well as other Unix-like systems, Microsoft Windows and macOS; ports exist for other platforms.
The program plays Go against the user, at about 5 to 7 kyu strength on the 9×9 board. Multiple board sizes are supported, from 5×5 to 19×19.
Strength
At this level of performance, GnuGo was between six and seven stones weaker than the top commercial programs on good hardware as of early 2009, but comparable in strength to the strongest programs not using Monte Carlo methods. It did well at many computer Go tournaments. For instance, it took the gold medal at the 2003 and 2006 Computer Olympiad and second place at the 2006 Gifu Challenge.
Protocols
Although ASCII-based, GNU Go supports two protocols—the Go Modem Protocol and the Go Text Protocol—by which GUIs can interface with it to give a graphical display. Several such GUIs exist. GTP also allows it to play online on Go servers (through the use of bridge programs), and copies can be found running on NNGS, KGS, and probably others.
Versions
The current (stable) version of GNU Go is 3.8. The latest experimental release was 3.9.1. There is also an experimental feature for using Monte Carlo methods for 9×9 board play.
A version called Pocket GNU Go, based on GNU Go 2.6, is available for the Windows CE operating system (Pocket PC). Versions based on the much weaker 1.2 engine also exist for the Game Boy Advance and Palm Pilot.
References
References
::callout[type=info title="Wikipedia Source"] This article was imported from Wikipedia and is available under the Creative Commons Attribution-ShareAlike 4.0 License. Content has been adapted to SurfDoc format. Original contributors can be found on the article history page. ::