Suppose you are playing blackjack at Blackjack Ballroom Casino and the dealer gives you a 8-9 cards. His face up card is a 10. Your hit move gives you another card, a 10, giving you a total of 27 (a busted hand). Eventually the dealer ends up with a 23. Because you busted before the dealer busted, you lose your wager. This situation is called a double-bust. This rule is the casino’s single advantage in blackjack. Check out the best online casino free signup bonus no deposit required list.