Chess Hounds Features:

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Feature Free Premium
Play chess online without installing extra software
Challenge specific players, or make open challenges
Limit the skill levels of players who can challenge you to games
Email notification when your opponent makes a move
Display your photo in your games
Chat with your opponent during games, either privately or publicly (visible to others who are watching)
Watch live games  
Chat with others who are watching the game / post your comments and game analysis  
Replay finished games, including player and watcher comments
Export finished games as PGN files  
Turn off ads in game window  
Chat rooms  
Message board
Send email to other members without revealing your email address

Chess Hounds premium membership