Go81 is made obsolete by Go169

This page is still left here for the benefit of owners of old devices that are not supported by Go169.

Go81 (v1.6, 103kb) is a free game for PalmOS. See license.txt for more information.
Monochrome to 8-bit colours. No warranty. Play against your Palm!

Please remove the old version before updating.

What is Go81?

Go81 is a program which plays the game of Go (also known as Weichi or Baduk) on small boards (9x9 and 13x13). It uses Chinese scoring and a 6.5 point komi (or 0.5 when using a handicap).


Use the pointer to play. You can choose the players, the board size and the number of handicap stones by selecting the options from the menu. The program scores the game after it is finished. After the game has ended, you can return to the option menu by tapping the board anywhere. You can also undo the last move, estimate the score or resign during the game by using the menu.
The opponent level 1 is fast but does not pass until very late in the game. That is good if you are just learning the basics but can be annoying later on.
The opponent level 2 is fast in the beginning but plays better and slower later.

Version History


Release date



Jun 12, 2004

Source code included, more accurate scoring, simplified options, resignation.


Jan 12, 2004

Stronger AI


Dec 21, 2003

User interface enhanced, fewer auto-ataris, bugfix in scoring.


Dec 13, 2003

Scoring and komi options, small improvements.


Oct 25, 2003

Fixed a bug that caused a crash with PalmOS 4 when using level 2.


Aug 12, 2003

Improved AI, 13x13 board included.


Jul 3, 2003

First release.


Design and implementation

Tapani Raiko

Beta testing

Rodney Topor, Bruno Ruffo


The game crashes at exit.
You still have a tiny file called Go81DB.pdb created by an old version of Go81. Try to uninstall and reinstall the game or use some file manager tool to remove the file. (Go81DB.pdb contains the options and the current board state.)

Scoring is incorrect.
Try to rescore by selecting score from the menu. Unfortunately the scoring is not always correct. The problem should not appear when using level 1 since it does not pass until the scoring is more or less obvious.

How does it work?

T. Raiko.
The Go-Playing Program Called Go81.
In the proceedings of the Finnish Artificial Intelligence Conference, STeP 2004, Helsinki, Finland, September 1-3, 2004.
Download: .ps.gz, .pdf


Go169 has replaced Go81.
Send comments to: Tapani.Raiko(a)hut.fi
The homepage (in Finnish) and the workpage (in English) of the author
Interactive way to Go is a site that teaches the basics of Go
Go81 (this page)
AtariGo for Palm is the capture game variant of Go
Game of Lives for Palm
British Go Association Software Catalogue
Selected freeware for Palm
Moyo Go Studio for analysing games on PC.
Wasp Games Pocket PC games by Osmo Suvisaari