A pair of 8s looks like a gift until you do the math. You’re staring at 16 — statistically the worst hand in blackjack. Hit it and you bust 62% of the time. Stand and the dealer beats you roughly 77% of the time against a 10 up card.
But split those 8s? Now you’ve got two hands starting at 8. Two fresh chances to draw a 10 and land on 18. Two shots instead of one, and both starting from a dramatically better position than the 16 you had seconds ago.
That’s the magic of splitting: turning one losing hand into two viable ones. But like every powerful move in blackjack, it only works when you use it correctly. Split the wrong pair at the wrong time and you’ve just doubled your bet on two garbage hands.
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This guide breaks down every pair — which to split, which to keep, which to never touch — with the reasoning behind each decision.
What does splitting mean in blackjack?
When your first two cards have the same value, you can split them into two separate hands. Here’s how it works:
- Place a second bet equal to your original wager next to your first bet
- Signal the dealer by placing two fingers on the felt in a V-shape
- The dealer separates your cards and deals one new card to each hand
- You play each hand independently — hit, stand, double down, or even split again
Each hand wins or loses on its own merits. You can win both, lose both, or win one and lose the other.
Important restrictions:
- Most casinos allow splitting any pair of equal-value cards (including mixed 10-value cards like Jack-Queen)
- When you split Aces, most casinos only deal you one card per Ace — no hitting allowed
- A 10-value card on a split Ace counts as 21, not a natural blackjack — it pays 1:1, not 3:2
- Re-splitting (splitting again after receiving a matching card) is allowed at most tables, up to 3 or 4 total hands
The complete splitting chart
This chart follows basic strategy for a standard multi-deck game (4-8 decks), dealer stands on S17, with DAS (Double After Split) allowed.
| Your pair | Dealer 2 | Dealer 3 | Dealer 4 | Dealer 5 | Dealer 6 | Dealer 7 | Dealer 8 | Dealer 9 | Dealer 10 | Dealer A |
|---|---|---|---|---|---|---|---|---|---|---|
| A-A | Split | Split | Split | Split | Split | Split | Split | Split | Split | Split |
| 10-10 | Stand | Stand | Stand | Stand | Stand | Stand | Stand | Stand | Stand | Stand |
| 9-9 | Split | Split | Split | Split | Split | Stand | Split | Split | Stand | Stand |
| 8-8 | Split | Split | Split | Split | Split | Split | Split | Split | Split | Split |
| 7-7 | Split | Split | Split | Split | Split | Split | Hit | Hit | Hit | Hit |
| 6-6 | Split | Split | Split | Split | Split | Hit | Hit | Hit | Hit | Hit |
| 5-5 | D | D | D | D | D | D | D | D | Hit | Hit |
| 4-4 | Hit | Hit | Hit | Split | Split | Hit | Hit | Hit | Hit | Hit |
| 3-3 | Split | Split | Split | Split | Split | Split | Hit | Hit | Hit | Hit |
| 2-2 | Split | Split | Split | Split | Split | Split | Hit | Hit | Hit | Hit |
D = Double down (treat as hard 10). Split = always split. Stand/Hit = play as a regular hand.
If your table does not allow DAS, some decisions change: 4-4 becomes always hit, 6-6 doesn’t split against 2, and 2-2/3-3 don’t split against 2 or 3. See our full strategy chart for the no-DAS version.
Green = split. Red = never split. Yellow = conditional (depends on DAS rules).
The two non-negotiable rules
Before we get into the nuances, these two rules are absolute. They apply against every dealer up card, in every variant, at every table. No exceptions.
Always split Aces
A pair of Aces gives you either 2 or 12 — both terrible totals. But split them and each hand starts with 11, which is the strongest starting position in blackjack. With roughly 31% of remaining cards worth 10, you’ve got a solid shot at 21 on each hand.
Even with the restriction that most casinos only deal one card per split Ace, the expected value is overwhelmingly positive. Computer simulations dating back to Ed Thorp’s work in the 1960s consistently show that splitting Aces is correct against every dealer card. It’s not even close.
Always split 8s
A pair of 8s gives you hard 16 — the worst hand in blackjack. You’re stuck between busting (if you hit) and watching the dealer beat you (if you stand). Splitting gives you two hands starting at 8, which is a perfectly playable total with plenty of room to improve.
“But what about 8-8 against a dealer 10?” I hear this question constantly. Yes, it feels awful. You’re splitting into two hands against the dealer’s strongest non-Ace card. But the math is unambiguous: splitting 8s against a 10 loses less per dollar wagered than either hitting or standing on 16. You’re not trying to win — you’re trying to lose less. And splitting achieves that.
The only edge case: in some European blackjack games with no hole card, surrendering 8-8 vs Ace can be marginally better than splitting, because you risk losing both bets to a dealer blackjack. But in standard American games with a hole card peek, split without hesitation.
The two non-negotiable “never splits”
Never split 10s
A pair of 10s gives you 20. That hand wins against everything except dealer 21 and a natural blackjack. Breaking up 20 to chase two less-certain hands is pure greed — and the math backs that up.
Yes, you’ll see YouTube videos of card counters splitting 10s at high true counts. That’s an advanced deviation for advantage players with a specific mathematical edge. For everyone else — and that includes 99% of blackjack players — keep your 20 and collect your winnings.
Never split 5s
A pair of 5s gives you 10, which is one of the best doubling down hands in blackjack. You should double against dealer 2-9 and hit against 10 and Ace.
Splitting 5s turns a strong hand (10) into two weak hands (each starting at 5). You’d need a face card on each just to get back to where you started. This is one of the clearest mistakes in the game.
Every other pair: the full breakdown
9-9: Split against everything except 7, 10, and Ace
This is one of the trickier splits because 18 is a decent hand. The reasoning:
- Against dealer 2-6 and 8-9: split. The dealer is vulnerable (bust cards) or can be beaten by two 19s more profitably than by one 18.
- Against dealer 7: stand. Your 18 beats the dealer’s likely 17 about 63% of the time. Splitting gives up a winning position.
- Against dealer 10 and Ace: stand. The dealer is too strong — two 9s can’t overcome a probable 20.
7-7: Split against dealer 2-7, otherwise hit
Fourteen is a stiff hand that loses against most dealer totals. Splitting against weak dealers (2-6) exploits their bust probability. Against dealer 7, you split because two 7s each have a chance of reaching 17 — matching or pushing the dealer’s likely total.
Against 8 through Ace, the dealer is too strong for splitting to be profitable. Just hit your 14 and hope.
6-6: Split against dealer 2-6, otherwise hit
Twelve is another stiff hand, but it’s low enough that hitting carries only a 31% bust risk. Against dealer bust cards (2-6), splitting is better because each 6 has a reasonable chance of becoming 16+ while the dealer self-destructs.
Against 7+, the dealer is too strong — hit your 12 and play by the hit/stand chart.
4-4: Split only against dealer 5-6 (with DAS)
This is one of the most conditional pairs. Without DAS, never split 4s — just hit your 8. With DAS, splitting against 5 and 6 makes sense because each 4 has a chance of drawing a 7 (making 11 to double) or other favorable totals, while the dealer’s bust probability is at its peak.
Against everything else, treat 4-4 as hard 8 and hit.
3-3: Split against dealer 2-7, otherwise hit
Similar logic to 2-2. A total of 6 is too low to do anything interesting with, but splitting against weak and medium dealers gives you two chances to build playable hands — especially with DAS, where drawing a 7 or 8 creates a strong doubling opportunity.
2-2: Split against dealer 2-7, otherwise hit
A total of 4 is always going to need help. Splitting against 2-7 gives each hand a chance to grow while the dealer faces bust potential. Against 8+, the dealer is too strong for this play to be worthwhile.
How DAS changes your splitting strategy
DAS (Double After Split) is a rule that allows you to double down on hands created by splitting. It’s a significant player advantage, and it changes several splitting decisions.
| Pair | Without DAS | With DAS | Why it changes |
|---|---|---|---|
| 2-2 | Split vs 4-7 | Split vs 2-7 | DAS creates doubling chances on 11, 10 after split |
| 3-3 | Split vs 4-7 | Split vs 2-7 | Same — wider split range when doubles are available |
| 4-4 | Never split (hit) | Split vs 5-6 | DAS makes the secondary double opportunities worthwhile |
| 6-6 | Split vs 3-6 | Split vs 2-6 | Extra double chance against dealer 2 |
DAS reduces the house edge by approximately 0.13%. It’s a small number, but over a year of regular play, it translates to meaningful savings. Always check the table rules before sitting down — DAS availability is usually printed on the felt or the placard.
Most Atlantic City blackjack tables allow DAS, which is one reason that ruleset has among the lowest house edges in the game.
Special rules for splitting Aces
Aces get special treatment at most casinos:
- One card only per split Ace. You can’t hit, double, or take additional cards.
- 21 on split Aces is not a natural blackjack. It pays 1:1 (even money), not 3:2.
- Re-splitting Aces is often prohibited. If you split Aces and receive another Ace, many tables won’t let you split again.
Even with all these restrictions, splitting Aces remains overwhelmingly profitable. The chance of drawing a 10-value card (31% of the deck) gives each Ace a strong shot at 21, and even non-10 draws produce decent hands (Ace + 8 = 19, Ace + 9 = 20).
Common splitting mistakes
Splitting 10s “because the dealer is weak.” A dealer showing 6 doesn’t make splitting 10s correct. Your 20 already beats a dealer bust. Don’t break a winning hand.
Never splitting 8s against high cards. This is the hardest pill to swallow, but the simulations are clear: hard 16 is worse than two hands starting at 8, even against a dealer 10. You’re choosing the least bad option.
Splitting 5s instead of doubling. Every time you split 5s, you’re turning one of the best doubling hands (10) into two of the weakest split hands (5). Always double.
Ignoring DAS availability. Playing a no-DAS strategy at a DAS table means missing profitable splits. Playing a DAS strategy at a no-DAS table means making unprofitable splits. Check the rules.
Treating splits as “two chances to win.” Splitting isn’t about excitement or getting two shots. It’s about expected value. Some splits (like 2-2 vs dealer 8) are incorrect even though “two chances sounds nice.” Trust the chart, not the feeling.
For the full list of costly errors, see our 12 biggest blackjack mistakes article.
Practice your splitting decisions
Pair splitting is the trickiest part of basic strategy to master because it has the most conditional logic — your decision depends on the pair, the dealer’s card, AND the table rules (DAS or no DAS).
The best way to learn: play hundreds of hands. Our free blackjack game deals you real pairs in real situations. Turn on strategy coach mode and every incorrect split (or missed split) gets flagged with a clear explanation.
Start by memorizing the absolutes: always split Aces and 8s, never split 10s and 5s. Then layer in the conditional pairs one by one. Within a week of regular practice, the chart becomes automatic.
Frequently asked questions
Can I split any two cards that match? You can split any pair with the same value. Most casinos also let you split mixed 10-value cards (like Jack-King or 10-Queen), though a few restrict splits to identical ranks only.
How many times can I re-split? Most tables allow up to 3 or 4 total hands. Re-splitting Aces is often restricted to one split only. Always check the house rules.
Can I double down after splitting? Only at tables that allow DAS (Double After Split). This rule is player-favorable and you should seek it out. It’s commonly allowed at Atlantic City and most online casinos.
Is splitting 8s against a dealer Ace really correct? In standard American games with a hole card peek, yes — split. The expected loss from playing 16 is worse. In no-hole-card European games, surrendering (if available) may be slightly better.
Why do card counters sometimes split 10s? At very high true counts (+5 or higher), the deck is so rich in 10s and Aces that splitting 10s against weak dealer cards becomes marginally profitable. This is an advanced deviation, not a basic strategy play. For 99% of players, the answer remains: never split 10s.
What to learn next
Splitting is the most complex basic strategy decision. Here’s where to continue:
- The other power move → When to double down
- The foundational decision → When to hit or stand
- All decisions in one chart → Basic strategy chart
- The math behind it all → Blackjack odds
- Know every term → Blackjack glossary
- Practice risk-free → Free blackjack game
And always: play responsibly.
Sources: Casino.org — How to Split in Blackjack (casino.org), Dyutam — When to Split Pairs Strategy (dyutam.com), PlayOJO — How to Split (playojo.com), Outplayed — When Can You Split (outplayed.com), Wikipedia — Aces and Eights in Blackjack (en.wikipedia.org), Blackjack Apprenticeship — Strategy Charts (blackjackapprenticeship.com), Casino Player Magazine — When to Split (casinocenter.com), GamesHub — When to Split (gameshub.com), Blackjack3000 — Basic Strategy Chart (blackjack3000.com)
