GNU Backgammon

Welcome to the GNU Backgammon web site

Welcome to the GNU Backgammon web site. This site will help you download and install GNU Backgammon, and give you tips on how to use GNU Backgammon to improve your game. GNU Backgammon is a world class backgammon application, and it works on many operating systems. It can play, analyse and teach backgammon. Its evaluation engine is based on artificial neural networks. Read more in the about section.

GNU Backgammon is free software and released under the GNU General Public License (GPL).

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News

One-sided race database reaches the midpoint

A one-sided race database that extends to the 13-point is now available for download. The file is a large one 1.6 GB, and may take close to a day to download even on broadband.

Other bearoff and hypergammon databases can be downloaded from here.

General information about using bearoff databases can be found here, including instructions for rolling your own.

17:11:14 - 04/01/05 ianshaw -

An evaluation of the pruning nets

After Joseph's fix for the choice of nets, I reran my collection of matches through both the old (pre-pruning) and new versions of gnubg.

I have 297 matches consisting of 2509 games.

First - speed improvement. The pruning net analysis took just under 36 hours, during this period I was also using gnubg to analyse some other matches, so there were about three games whose analysis took longer than the old version, almost undoubtedly for this reason. The general speedup was 1.74 times with a standard error of 0.37. [Read more]

13:24:43 - 11/14/04 Jim -