When to Double Down or Split in Blackjack? The double-down option can be pretty lucrative in the long run. When choosing this option, pg slot the player doubles his bet and gets only one more card. In reno rule the double-down is allowed only with 9, 10, or 11. According to the european standard - the double-down is allowed only with 10 or 11. If the cards of the same value are found in the starting hand, e.g., 6/6 or 9/9 or J/K, the player can split. In this way, the player creates two separate hands that play independently of each other.