Most styles of blackjack will let you double down on split hands, and also re-split your hands further if the possibility arises. However, as explained, some casinos have rules which restrict additional options. Here are the two common rule variations. Blackjack players strongly believe that you have to double down a total of eleven. Splitting is allowed only once. After splitting, you cannot get a natural Blackjack even if you have 10-Ace; it is valued as an ordinary 21. Some pairs cannot be split (Ace, 10, etc.). No double down after splitting allowed. The casino gives back some of this advantage by paying 3-2 on blackjack, allowing players to see one of the dealer's cards, and by allowing the player to double down and split pairs. Blackjack Double Down And Split. Blackjack double down and split It is imperative as a blackjack player to learn this basic strategy. Basic blackjack strategy charts can help make it easy to learn the basics of when to hit, when to stand, when to double down and when to split pairs in any situation. Basic blackjack strategy charts are tables that list possible hand values on one axis and possible dealer upcard values on the other axis. The second lowest defender slides across to the high split-line around the free-throw line. Like the tactic above, both players are now responsible for the three offensive players on the weak side of the court and must scramble once the pass is made.