Why You Always Split Aces and Eights

You always split aces and eights because both moves take a weak or wasteful starting position and turn it into two hands with genuine upside. Splitting aces gives you two fresh chances to reach 21 or a strong total instead of one clumsy soft hand. Splitting eights breaks apart a stiff 16, the worst hand in the game, into two hands that each begin with a solid eight. Basic strategy says split both every time, no matter what the dealer shows.

Why is a pair of aces so valuable when split?

A pair of aces counted together equals either 2 or 12, and neither total is any good. Left alone you would almost certainly hit, and one large card leaves you stuck with a mediocre stiff. When you split, each ace becomes the foundation of its own hand, and any ten-value card gives you 21. Since ten-value cards make up nearly a third of the deck, your odds of landing at or near 21 on each hand are strong. Two shots at a premium total beat one shot at a bad one, which is exactly why splitting aces gains you money over the long run.

Why split eights instead of playing 16?

Sixteen is the hand every player dreads. It is too high to hit safely without busting often, yet too low to win by standing when the dealer holds a strong upcard. You are stuck defending a total that loses more than it wins. Splitting the eights lets you abandon that trap entirely. Each new hand starts at eight, a flexible number that welcomes almost any follow-up card. A ten gives you 18, a two or three keeps you live, and you can double or split again if the rules allow. You are trading one guaranteed underdog for two hands with real fighting chances.

Do I split them against a strong dealer card too?

Yes, and this is where many players hesitate. When the dealer shows a nine, ten or ace, splitting eights can feel reckless because you are risking a second bet against a scary card. But the math still favors splitting. Playing a single 16 against a ten is one of the biggest money-losing positions in blackjack, and two eights lose less on average than that one 16 does. You are not splitting because you expect to win big. You are splitting because it cuts your expected loss. Reducing damage is just as valuable as chasing profit when the long-run edge is what matters.

Which pairs should I never split?

The always-split rule for aces and eights has a matching pair of pairs you should never split. Understanding both keeps your decisions clean at the table. The general logic: never break a hand that is already strong, and never split a pair that only creates two weak hands.

• Never split tens. A pair of tens is 20, a near-certain winner. Splitting it gambles a great hand for two uncertain ones, which is a clear mistake.
• Never split fives. A pair of fives is 10, a perfect total to double down on. Splitting turns one promising hand into two hands starting with a lonely five.
• Never split fours as a rule of thumb unless very specific rules apply, since two fours starting hands are weaker than the 8 you already hold.

How does splitting actually work at the table?

When you split, you place a second bet equal to your first, and the dealer separates the two cards into two hands. Each card receives a new card on top, and you then play each hand in turn. With most pairs you can keep hitting normally. Aces are the common exception: nearly all casinos give each split ace only one additional card and no more. That single-card rule is why a split ace that catches a ten counts as 21 rather than a natural blackjack, and it usually pays even money rather than the premium blackjack rate.

Does the number of decks change this advice?

The core instruction to always split aces and eights holds across single-deck and multi-deck games alike. Deck count and house rules shift the value of many borderline decisions, but these two splits are so strongly favored that no common rule set overturns them. What can change around the edges is whether you are allowed to resplit aces, whether you can double after splitting, and how many total splits a hand permits. Those rules affect how much you gain, not whether you should split. When in doubt, split the aces and eights and let the long-run numbers work in your favor.

What is the simple way to remember this?

Memorize the short phrase that every experienced player knows: always split aces and eights. It is the one splitting rule with no exceptions tied to the dealer upcard, which makes it the easiest to lock into memory. Aces give you two runs at 21, and eights rescue you from the miserable 16. Pair that phrase with its opposite, never split tens or fives, and you have covered the most important splitting decisions in the game. Everything else on the pair chart depends on the dealer card, but these anchors never move.

Does splitting these pairs guarantee a winning hand?

No, and it helps to be clear about this. Splitting aces and eights improves your expected value over the long run, but it does not promise that either new hand will win on any given deal. You will still lose plenty of split eights against a dealer ten, and split aces sometimes catch small cards and disappoint. The value comes from the average across thousands of hands, not from a single round. Think of every correct split as buying a better long-term outcome, even when this particular hand stings. Judging the decision by whether you won or lost one time is the wrong lens. The math rewards the pattern, so keep splitting the aces and eights and let the results even out over many sessions.

Frequently asked questions

Should I still split eights against a dealer ten?

Yes. A single 16 against a ten is one of the worst hands in blackjack, and splitting into two eights reduces your average loss even against that strong upcard. You are not expecting to win the hand outright, you are choosing the option that costs you the least money over many repetitions.

Why does a split ace with a ten not count as blackjack?

A natural blackjack requires your original two dealt cards to be an ace and a ten-value card. Once you split, each ace becomes a new hand, so a ten landing on it makes 21 but not a natural. Most casinos pay this the standard even money rather than the higher blackjack rate.

Can I split eights more than once?

It depends on house rules. Many casinos let you resplit up to a total of three or four hands if you draw another eight, and some allow doubling after the split. These options increase your expected value, but even where they are not offered, the basic instruction to split the first pair of eights still stands.

Is splitting aces and eights ever wrong?

Under standard casino rules, no. These two splits are favored strongly enough that no common variation reverses them. Only in unusual house rules or exotic variants with heavily altered payouts could the math shift, and those games use their own strategy charts, so the everyday answer remains to always split both.