CGOS (Computer Go Server)
Connect your Go-playing program and get a rating against other engines
CGOS is a Go server where only computer programs play. You connect your Go engine with a small client program, and the server pairs it with other engines around the clock on 9x9, 13x13 or 19x19 boards. Results feed a live ratings table with game archives you can download.
Free · No login · Server · Advanced
About CGOS (Computer Go Server)
It is a test bed for Go AI: tree search, neural network evaluation and time management. It suits advanced programmers who already have an engine that speaks the standard Go Text Protocol.
It runs as a public server with web standings pages. There is no fee. Each bot needs a name and password that it registers on first connection. Strong open-source engines such as KataGo also play there, so it is a hard field.
On Breakpoint since 25 Oct 2026.
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