I recently stumbled upon the Asian game Mahjong and came to like it. I already play Go and Chess online, but had difficulties finding a good, English-language Mahjong server.
Are there any English servers, and if so what are they?
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You could also try MahjongExpress. I've never played on there, but it looks like it requires you to install software, kind of like the online poker games.
A friend notified me of a site he occasionally plays on: http://tenhou.net/
According to him, it's a nice site. Problem is that it's entirely in Japanese. He's lucky enough to understand Japanese but most people don't so I added this answer just for reference.
Update: I found a nice site where you can play (only) against the computer. English language, no setup, completely free and easy to use - a great introduction into Mahjong.
Update 2: This page lists several clients. I did not try them yet.
I've also fell in love with this game recently. To play against players I am trying out MahjongTime, they give you a certain number of chips to play a day and you can play off of that. (four times a day if you don't win any games) and play for 0 mp
They have different styles of play, Hong kong, Taiwanese, American... etc.
And different rules. Not sure I would trust them for cash games but it is a good relief for quick games.
I don't find it very social though.
The National Mah Jongg League has an "official" version of American Mah Jong online with a PC based client. It cost an additional $40/year to your membership/card for the league. I have never tried it but it does allow for live online play with the current year's card.