Splitting aces and eights is the one pair rule every blackjack chart agrees on for standard peek games: always split them, against any dealer card. Two aces make an awkward soft 12 and two 8s make 16, the weakest total you can hold, while each card on its own is a far better start.
In 4–8 deck peek games, split aces and 8s against every dealer card.
Split aces usually get one card each, and a ten-value card makes 21, not blackjack.
Each split ace reaches 17 to 21 on about 8 draws in 13 (61.5%).
Do not surrender 8,8 where surrender is offered; split it.
No-hole-card games change the risk of splitting against a ten or ace, so check their chart.
Basic strategy play
Split A,A and 8,8 v any dealer card
Cards to each split ace
Usually one
Chance of A,A or 8,8 (8 decks)
About 0.57% each
No splitting aces rule
Costs the player 0.18%
Re-splitting aces allowed
Worth +0.08% to the player
Splitting aces and eights: the rule in one line
The Wizard of Odds 4 to 8 deck basic strategy (opens in a new tab), for games where the dealer stands on soft 17, says to always split aces and 8s. There are no exceptions against any dealer card in that chart, and if surrender is offered the chart still splits 8,8 rather than surrendering it. Few blackjack decisions are this clear, which is why it is often the first strategy rule players learn after the basics in our blackjack guide.
The rule does not stand alone; it sits inside the pair section of the chart covered on when to split in blackjack. This page looks at only these two pairs: why each one is split, what happens next and which rule changes matter.
Aces and eights side by side
The two pairs are split for opposite reasons. Aces are split because each ace is a strong card wasted in a single hand. Eights are split because the combined total is weak and each 8 alone is a modest but workable start.
A,A and 8,8 compared
Pair of aces
Pair of eights
Total if not split
Soft 12
Hard 16
Why that total is poor
Only 12; any good draw still needs help
Busts on 8 ranks of 13 (61.5%) if hit; rarely wins if you stand
Start of each split hand
11 (ace counted high)
8
Cards after splitting
Usually one per ace
As many as you like
Double after split
Not possible with one card per ace
Often allowed on 8-2 or 8-3
Main gain from splitting
Two hands that make 21 with any ten-value card
Escaping the worst total for two average ones
The card values explain both rows: an ace is 1 or 11, and with 16 ten-value cards in each 52-card deck, a hand starting on 11 or 8 has a fair chance of drawing a high card.
Splitting aces: one card each
The Wizard of Odds basics (opens in a new tab) note that split aces receive only one card each at most tables. That limit is the price casinos charge for a very strong split. Here is what that one card does, treating each rank as 1 in 13.
One card drawn to a split ace
Card drawn
Hand total
Chance
10, J, Q or K
21
4/13 (30.8%)
9
20
1/13 (7.7%)
8
19
1/13 (7.7%)
7
18
1/13 (7.7%)
6
17
1/13 (7.7%)
2 to 5
Soft 13 to 16 (no more cards)
4/13 (30.8%)
Ace
Soft 12, or re-split where allowed
1/13 (7.7%)
Eight draws in 13, about 61.5%, give each ace a total of 17 to 21. The weak results, a soft 13 to 16, are stuck because no further card is allowed. A third ace can sometimes be split again; Wizard of Odds puts the value of a re-split-aces rule at +0.08% for the player.
Is a split ace and a ten a blackjack?
Usually not. In most games a two-card 21 made after splitting counts as an ordinary 21 and pays even money, not 3 to 2. Read the game's help screen for the exact wording, and see our answer on what happens if you split and get blackjack.
Splitting eights: escaping 16
Sixteen is the hand basic strategy most wants to get rid of. As the hard hands page shows, hitting it busts on 6 or higher, 8 ranks in 13, while standing wins only when the dealer busts. Splitting 8s replaces that with two hands that start on 8. Here is what the first card to each 8 can bring.
First card drawn to a split 8
Card drawn
New total
Usual next step
Chance
2 or 3
10 or 11
Double if allowed, per the chart
2/13 (15.4%)
4 to 7
12 to 15
Stand or hit by dealer card
4/13 (30.8%)
8
16 again
Re-split if allowed, else play as 16
1/13 (7.7%)
9
17
Stand
1/13 (7.7%)
10, J, Q or K
18
Stand (as hard 18)
4/13 (30.8%)
Ace
Soft 19
Stand
1/13 (7.7%)
Six draws in 13, about 46.2%, give an 8 an immediate 17 to 19. Two more set up a double where the rules allow it. Compare that with a single 16, which can never reach 17 or better without risking a bust.
Splitting 8s against a 10 or an ace
This is where players hesitate. Putting a second stake against a dealer 10 feels like adding to a losing position. The point is that 16 against a 10 already is a losing position. Splitting does not make the hand a winner; it makes the expected loss smaller than standing, hitting or surrendering a single 16. That is why the chart splits 8,8 even where surrender is available, and why the surrender rules on our blackjack surrender page exclude it.
In a standard peek game, the dealer has already checked for blackjack before you decide, so a dealer 10 or ace showing means the dealer does not have a natural. That makes the second stake safer than it looks.
No-hole-card games are different. In most European games the dealer takes a second card only after players finish, and under the European no-peek rule as analysed by Wizard of Odds you lose your whole stake, split bets included, if the dealer makes blackjack. Splitting against a ten or ace is rarely correct in those games, so use the Wizard of Odds European strategy (opens in a new tab) rather than this rule of thumb. Our European blackjack page explains the procedure.
Aces and eights in pounds
Aces against a 9. You bet £20 and receive A,A. You split, adding £20. The first ace draws a king for 21; the second draws a 4 for soft 15 and must stop. The dealer turns a 10 for 19. Hand one wins £20 (an ordinary 21 pays even money), hand two loses £20, and you finish level on the round.
Eights against a 7. You bet £10 on 8,8. Split to two £10 hands. The first draws a 3 for 11 and, with doubling after splitting allowed, you double to £20 and draw a 9 for 20. The second draws a jack for 18. The dealer shows 7 and turns over a 10 for 17. Both hands win: £30 profit from a pair that would have been a hard 16.
Eights against a 10, losing both. You bet £10 on 8,8 and split. You end on 18 and 17; the dealer makes 20. You lose £20 instead of £10. Losing rounds like this are part of the reason the split is right: over many hands, the total lost is still smaller than with a single 16.
How to split aces and eights: step by step
Check the help screen for the split rules: one card per ace, re-splitting limits and whether doubling after a split is allowed.
Confirm the game uses a hole card (peek); if it is a no-hole-card game, check its own chart for 8,8 and A,A against a 10 or ace.
When dealt A,A or 8,8, press Split; a second stake equal to the first is placed.
For aces, accept the single card dealt to each; you cannot hit them further.
For eights, play each hand with the hard-total chart, doubling 10 or 11 where allowed.
If you draw another ace or 8, re-split only where the rules allow it.
Split and doubled stakes can be lost to a dealer blackjack
These figures are additive approximations against one baseline, so treat combined totals as a rough guide. Our blackjack house edge page gives full rule sets, and the re-split glossary entry covers the terminology.
Where the rule came from, and the myths around it
The first mathematically sound optimal blackjack strategy, 'The Optimum Strategy in Blackjack', was published by Baldwin, Cantey, Maisel and McDermott in September 1956, as recorded in the Wikipedia history of blackjack (opens in a new tab). Splitting aces and 8s has been a fixture of basic strategy charts ever since. Our history of blackjack page covers the story.
"Splitting 8s against a 10 is reckless." It loses less on average than any alternative in peek games.
"After two losing splits, skip the next one." Past hands have no effect on the next deal; see the gambler's fallacy.
"Split aces pay 3 to 2 when you hit a ten." In most games they pay even money as an ordinary 21.
"Always splitting aces and 8s means the house loses." The rule cuts the house edge; it does not remove it.
Aces and eights at UK live and online tables
A split instantly doubles the money you have in play, and blackjack is not covered by the online slot stake caps, so make sure your stake leaves room for it. At live blackjack tables you will usually have a short timer for the split decision. Under Gambling Commission rules in force since 17 January 2025, each round of a non-slot online casino game must last at least 5 seconds, autoplay is banned and your net spend and time played must be visible. If you want help keeping play in check, the National Gambling Helpline (0808 8020 133) is free and open around the clock; our support services page lists more.
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Frequently asked questions
Should you always split aces and eights?
Yes, in standard 4 to 8 deck games where the dealer peeks for blackjack and stands on soft 17, basic strategy splits aces and 8s against every dealer card. The one caution is no-hole-card games, where a dealer blackjack can take your split stakes too, which makes splitting against a ten or ace riskier; use a chart for those rules. Our answer to should you always split aces and the basic strategy guide cover the details.
Why do you split 8s against a dealer 10?
You split 8s against a 10 because a hard 16 against a 10 is already a losing position, and splitting loses less on average than standing, hitting or surrendering. Each 8 can become 18 with a ten-value card, while a single 16 cannot improve without a big bust risk. Many split hands still lose, but fewer pounds are lost over many hands. See hard hands in blackjack for the bust odds on 16.
Can you hit after splitting aces?
At most tables you cannot: each split ace receives one card only, and the hand is then complete. That is the casino's trade-off for allowing such a strong split. If the one card is another ace, some games let you re-split, which Wizard of Odds values at +0.08% for the player. Others treat it as soft 12 and stop. The game's help screen says which. Our split glossary entry explains the general rules.
Does a split ace and a ten count as blackjack?
In most games, no: an ace and a ten-value card made after splitting count as an ordinary 21 and pay even money rather than 3 to 2. The hand still beats any dealer total below 21. A few games may word their rules differently, so check the help screen. Our answer on what happens if you split and get blackjack goes through it, and blackjack payouts lists the standard returns.
Should you surrender 8,8 instead of splitting?
No, the Wizard of Odds 4 to 8 deck chart specifically excludes a pair of 8s from the surrender rule for 16. Where surrender is available, you surrender other hard 16s against a 9, 10 or ace, but you split 8,8. Splitting gives two hands that start on 8, which loses less on average than giving up half the stake. Our page on the blackjack surrender rule sets out exactly which hands to surrender.
How often are you dealt aces or eights?
In an eight-deck shoe, each specific pair comes up about 0.57% of the time, roughly once in 174 hands. The working is 32/416 for the first card times 31/415 for the second. So A,A or 8,8 together turn up about once in 87 hands. That makes these rare decisions, but the stake usually doubles when they arise. Our blackjack odds page and the probability guide show more calculations like this.
Do you split aces and eights in European blackjack?
You split them against weak dealer cards, but against a ten or an ace the answer can change. In no-hole-card games the dealer's second card comes after you act, and under the European no-peek rule a dealer blackjack takes split stakes as well, so doubling or splitting against a ten or ace is rarely correct. Use a chart built for European rules. Our European blackjack page explains the procedure and its 0.62% edge under Wizard of Odds' rules.
Is splitting aces always profitable?
No single split is ever certain to win, and splitting aces does not make blackjack profitable overall. It is one of the best plays in the game because each ace has a strong chance of reaching 17 to 21, about 61.5% per hand, but you can still lose one or both hands. The casino keeps an edge across the whole game. See can you win at blackjack in the long run for the long-term view.
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