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What Is Pair Splitting in Blackjack?
When your first two cards are identical in value, you can split them into two separate hands. Each hand receives an additional card, and you must place a second bet equal to your original wager. You then play each hand independently.
Splitting transforms one potentially weak hand into two hands with better winning chances. The strategy doubles your risk but creates opportunities to win twice—or at minimum, reduce losses on bad starting totals.
The Two Golden Rules
Before memorizing complex charts, know these two rules that never change regardless of dealer upcard or table conditions:
Always Split Aces
Two Aces equal soft 12—a mediocre starting hand. Split them and each Ace becomes the foundation for a potential 21. Drawing a 10-value card (30.7% probability) to either hand creates blackjack-strength totals. Most casinos restrict split Aces to one card each, but the expected value still massively favors splitting.
Always Split 8s
Two 8s equal 16—the worst possible hand in blackjack. You lose against any dealer total of 17+, and hitting risks busting. Splitting converts this disaster into two hands starting at 8, each with reasonable improvement potential. Even against dealer 10 or Ace, splitting 8s loses less money than playing 16.
Complete Pair Splitting Chart
| Your Pair | Dealer 2-6 | Dealer 7 | Dealer 8-9 | Dealer 10-A |
|---|---|---|---|---|
| A-A | Split | Split | Split | Split |
| 10-10 | Stand | Stand | Stand | Stand |
| 9-9 | Split | Stand | Split | Stand |
| 8-8 | Split | Split | Split | Split |
| 7-7 | Split | Split | Hit | Hit |
| 6-6 | Split | Hit | Hit | Hit |
| 5-5 | Double | Double | Double | Hit |
| 4-4 | Split (5-6) | Hit | Hit | Hit |
| 3-3 | Split | Split | Hit | Hit |
| 2-2 | Split | Split | Hit | Hit |
Never Split These Pairs
Never Split 10s
Two 10s equal 20—the second strongest hand possible. Splitting destroys a near-certain winner hoping to create two winners. The math never supports this. Even against dealer 6 (highest bust probability), standing on 20 produces better expected value than splitting.
Never Split 5s
Two 5s equal 10—a strong doubling hand. Treat this as hard 10, not as a pair. Double against dealer 2-9, hit against 10-A. Splitting 5s creates two hands starting at 5, both terrible foundations requiring perfect draws to compete.
Conditional Splits: 4s, 6s, 7s, 9s
These pairs require reading the dealer's upcard. Split when dealer shows weakness (2-6), stand or hit when dealer shows strength (7-A). The 9-9 exception: stand against dealer 7 because your 18 beats dealer's likely 17.
DAS Rule Impact
DAS (Double After Split) changes several decisions. When allowed to double after splitting, split 4s against dealer 5-6 becomes profitable. Without DAS, hitting 4-4 produces better results. Always verify table rules before applying strategy.
Mastering pair splits works alongside other strategic decisions like knowing when to surrender. For the exact situations where folding beats playing, see our guide on blackjack surrender strategy.