Blackjack Strategy Trainer 21
The basic split rule
You can split when your first two cards form a pair. You place a second bet equal to your original wager, the dealer separates the cards, and each card becomes the first card of a new hand. You then play the hands one at a time against the dealer's single hand.
Most casinos treat any two ten-value cards as a pair, so 10-J, J-Q, Q-K, and 10-K can usually be split. Some casinos require the exact same rank, but that rule mostly affects mechanics, not correct play, because basic strategy says never to split ten-value pairs anyway.
Common casino split limits
| Rule | Typical version | Strategy impact |
|---|---|---|
| Maximum splits | Up to 3 splits, 4 hands total | Usually no chart change; stop when the casino stops you |
| Split aces | One card per split ace, no further hits | Still split A,A every time |
| Resplit aces | Often not allowed | Allowed RSA is better for the player |
| DAS | Double after split allowed in many US games | Makes 2,2, 3,3, 4,4, and 6,6 more aggressive |
| Split tens | Usually allowed mechanically | Do not split under basic strategy |
What happens after you split
After the dealer separates the pair, each hand is played independently. If you split 8,8 and draw a 3 on the first 8, that hand is now hard 11 and may be doubled if the table offers DAS. Then the dealer moves to the second 8 and repeats the process. Your final result can be one win and one loss, two wins, two losses, or pushes.
If another matching card appears after a split, many casinos let you split again until the table maximum is reached. Aces are the exception: split aces are often restricted to one card each and cannot be resplit unless the table specifically allows RSA.
Rules are not strategy
The rules tell you when a split is legal. Strategy tells you when a split is profitable or least-bad. A pair of 10s is usually legal to split, but it is a bad basic-strategy play. A pair of 8s against a dealer 10 is a losing situation either way, but splitting loses less than hitting or standing on 16.
The clean rule of thumb: always split aces and 8s, never split 5s or 10s, and use the chart for everything in the middle.
Split rules to ask before sitting down
- Can I double after split?
- How many times can I split?
- Can I resplit aces?
- Do split aces receive one card only?
- Are ten-value cards splittable by value or only exact rank?
Bottom line
If you remember one procedural rule, remember DAS. Double After Split changes several borderline pair decisions and is worth about 0.14% to the player across a full game.