I found this site where you get to play BlackJack against other players for points. It's a good game to practice.
VIEW: (Dead link: http://www.onlypoints.com/multiplayer_game.php?game_id=10) _Game LINK_
VIEW: (Dead link: http://www.onlypoints.com) _Site LINK_
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Game Addict
Boyaa
VIEW: (Dead link: http://www.onlypoints.com/multiplayer_game.php?game_id=10) _Game LINK_
VIEW: (Dead link: http://www.onlypoints.com) _Site LINK_
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Game Addict
Boyaa