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A commercial quality interface for playing chess on the internet. Apart from the normal playing mode, there are rooms for tournaments (which are particularly good fun!), teams and correspondence chess, an online database of your played games, and funky features such as autocommenting. This is my no.1 choice for playing on the internet!
http://chessok.com/playing_zone.html
There are some extra boards and piece sets from Chessassistance.com.
Options/Autocomment will give you an instant analysis of your game when you've finished playing.
You can use the program to query online 6-man tablebases. In the Playing Room, press the Examine button, then use the Position button to set up the position, and the arrow to the right of the Engine button to get an evaluation or, uniquely, a best line.
You can also play using a simplified flash interface in your web browser here.
None! It doesn't have smartmove or premove, but I think this makes games more enjoyable and less like an arcade game.