http://gobase.org/
I think it's kind of a neat study tool. I've been working through some of the problems and I find it "cathartic".
Uberdude wrote:Gobase does have some nice articles (though Charles Matthews' Shape Up! is now available at http://cdn.online-go.com/shape_up.pdf, not sure about the On Your Side series or Peter Mioch's articles) [...]
Uberdude wrote:I would also warn that at some point the owner (Jan van der Steen?) seemed to be uncommunicative so some people made the 'donation' but then didn't get the account for ages so I would ensure you can contact him first that he is active before sending money, though I do see updates about AlphaGo so that is promising.