Number of legal 18x18 Go positions computed. One more to go

They have a variety of board sizes, game types, and recently added tournaments. The average game will play 2-4 moves per day. I typically have 15-18 games going simultaneously, which overall gives me just enough to do while waiting for dependencies to download or the CI server to run.

One note of caution if you've played on other servers: DGS's rankings are shifted considerably higher than many other online servers (much closer in parity with the professional organizations). More info here: http://senseis.xmp.net/?RankWorldwideComparison

Komi(compensation given to the second player) is a recent invention(1900s) and has only gone up from 4.5 to the recent 6.5 or 7.5 in some tournaments, and yet black still wins over 50% of professional games. Knowing how much komi should be is equivalent to knowing how to play the best game.

As the board fills up tactics or 'tesuji' becomes increasingly important and many times there is only one correct move, computers have become better at this but they still can struggle over common life and death problems. End game is where computers really shine and can now play better than even the best players. Overall computers have taken a recent dramatic upturn in strength thanks to Monte Carlo probabilistic reasoning and are now within a few stones of professionals.

Seemingly, Go will become as chess is within our life times probably even within the next ten years, it will be another interesting moment in the advance of 'AI', but whether it will reveal anything deeper is an open question to me.

I find Go more interesting than chess because often, especially in the beginning, the analysis is less 'hard' or involves less reading of game tree possibilities but involves more 'soft' concepts like spacing, relative territory, trading territory for influence (whether to play on the third line or the fourth line), and is something more akin to art than science if I were to grasp for a metaphor.

Computers will likely enlarge the 'end game' that is be able to play better and better than humans the last part of the game and eventually play better middle game, and eventually only the opening will be where humans have an advantage until that too is taken by computation.

(I'm about an AGA 6 dan)

Regarding clients, there are a few options. CGoban2 is the only client you can use to access KGS, which is currently the biggest English-speaking server. You can also try online-go.com which is entirely browser-based so you don't need a client, and there's also IGS, a Japanese server which can be accessed through their own client called GoPanda2 or other clients like qGo2. There are also two servers called Tygem and WBaduk which are mostly Korean. They have proprietary clients you can run through Wine. I think they're supposed to be accessible through qGo2 as well, but I haven't been able to play through it, only observe others' games.

Also, if you're just learning, http://senseis.xmp.net/ is a great resource.