What are the rules of the game GO?

Try the British Go site. It compares different rule sets, and has links to each set so you know what the full rules are when you choose one to "go" with. :) The rules are very simple. The differences come into being as to how to count score and handicaps. Black goes first. Players alternate. Play until someone resigns or both players pass twice. Pieces must always be able to 'breathe.' The only other challenge is understanding ko and what to do with it. See the Related Links for "Britsh Go Association" to the bottom for the answer.