Blackjack Wikipedia
The rules of blackjack are fairly simple, which is a significant reason for the sport's enduring recognition. The object is to get a hand with a price as near 21 as possible without going over. The players at a blackjack table don't play towards one another; they play in opposition to the supplier. Under the "Reno rule", doubling down is only permitted on onerous totals of 9, 10, or 11 (under an identical European rule, solely 10 or 11).