In American Blackjack you go head-to-head against the dealer in pursuit of the highest value hand. Both the dealer and the player are dealt 2 cards each, with the target being 21.
Dealer stands on soft 17. Players may double down on any two cards. Players may double down after splitting. Players may split 3 times, making up to 4 hands. Aces can be split only once. Players can only hit once to split Aces. 21 on a split Ace does not count as Blackjack.