Split in Blackjack
A split is the blackjack move in which a player whose first two cards share the same value separates them into two hands, placing a second stake equal to the first. Each card then gets a new second card and is played on its own, winning or losing independently. The move only exists in blackjack and its close variants, and the rules around it differ from table to table: how many times you may split again, whether you may double afterwards, and what happens to aces.
How a Split Works at the Table
The trigger is a pair of equal value, so two eights qualify, and on most tables a king with a queen does too, since both count as ten. Some games only allow ten-value cards to be split when they share the same rank, which is one of several details worth reading in the game rules before the first hand.
Once the player calls a split, the dealer separates the cards, the extra stake goes beside the second card, and the first hand is dealt its new card. That hand is played out fully, by hitting, standing or doubling where allowed, before the dealer moves to the second.
Each hand is settled on its own merits.
Here is where aces get special treatment, and it is the rule most often misunderstood. On the standard table each split ace receives exactly one card and then stands automatically, with no hitting or doubling. If that card is a ten, the hand counts as 21 rather than blackjack, so it pays even money instead of 3 to 2. Taking a €10 pair of aces as an example: splitting puts €20 on the table, and an ace with a king that follows returns €10 profit on that hand, not the €15 a natural would have paid.
Resplitting and DAS
If a new card forms another pair, many games allow a resplit, commonly up to four hands in total, though the limit is set by each game rather than by any universal standard. Double after split, shortened to DAS, lets the player double down on a hand created by splitting. Resplitting aces is less common, and hitting split aces is rarer still.
Split Compared With Double Down
Both moves ask for a second stake equal to the first, which is why newer players tend to mix them up. The rows below set out where they actually differ.
Split | Double down |
|---|---|
| Needs a pair of equal value | Usually any first two cards, sometimes only 9-11 or 10-11 |
| Extra stake equals the original bet | Extra stake equals the original bet |
| Creates two hands, each playable further | One hand, exactly one more card |
| Can be repeated where resplits are allowed | Allowed once per hand |
What Split Rules Do to the House Edge
Split rules change the long-run mathematics of the game, and the effects can be put in figures. Using the Wizard of Odds house edge calculator for a six-deck game where the dealer stands on soft 17, a starting game with DAS, splits to four hands and no resplit aces comes out at about 0.43%.
Removing double after split pushes that to around 0.57%, a rise of roughly 0.14 points. Allowing aces to be resplit cuts it by about 0.07 points, and allowing hits on split aces cuts it by about 0.19 points. Other published tables give slightly different values, such as 0.12 for DAS or 0.13 for hitting split aces, because they start from different reference rules.
The figures are averages over millions of hands, never a forecast for one evening.
A house edge of 0.43% on €500 of total stakes means an expected loss of a little over €2 across a very long run of play. A single session can sit far from that, in either direction, and a run of good splits proves nothing about the game. What a rule card does tell you is which of two otherwise identical tables gives back more in the long term, so reading the DAS and resplit terms in the game information panel is a sensible habit on any live or RNG blackjack table.
When Basic Strategy Says to Split
Basic strategy has two fixed rules that hold almost everywhere: always split aces and eights, and never split fives or tens. A pair of fives is a strong total of ten for doubling, while two tens already make twenty, which is too good to break up.
The other pairs depend on the dealer’s upcard and on the table rules. Strategy charts for shoe games typically split nines against 2-6 and 8-9, sevens against 2-7, and twos or threes against 2-7 where DAS is allowed, narrowing to 4-7 without it.
Fours are split only against a dealer 5 or 6, and only with DAS.
Games without a dealer hole card, which includes many European-style and live casino tables, add a further adjustment, and strategy charts there advise against splitting eights against a ten or ace. Since practice varies between studios and operators, the chart worth using is the one built for the exact rules shown in that game’s help screen, not a generic one copied from elsewhere.
