RGG FAQ Part 6 Section 4
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As already explained, computers make weak opponents. Since they cannot learn, they also make boring opponents, as they make the same mistakes over and over again. Of course it can be fun to beat a computer which takes a 9stone handicap, but the methods used to beat it are unlikely to work against human players, and may even give you bad habits.
However, computer programs play each other in various tournaments and can be ranked by their relative strengths.
Here is an excerpt from the Smart-Games site, edited by David FOTLAND.
It gives an indication of the 'average placement in an international competition', based on recent results in international computer Go tournaments:
Top ten Go playing computer programs (Last updated August 2002):
Author Program Score ZhiXing? Chen Handtalk/Goemate 1.9 Michael Reiss Go4++ 2.1 Ryuichi Kawa Haruka 3.2 Lei Xiuyu Wulu 3.8 David Fotland The Many Faces of Go 4.0 Ken Chen Go Intellect 5.9 Yong-Goo Park Fun Go 6.6 Tristan Cazenave Gogol/Golois 9.5 Oishi Yasuo Goro 9.7 Hiroshi Yamashita Aya 10.0
However, playing strength might not be the main advantage of a computer program. Other aspects might be more important, such as aesthetics, games database, teaching possibilities etc.
The ideal program for you will therefore depend on what you want to do with it.