The Situation Most Players Meet
You sit down, buy in, and the first hand deals you two 4s. The dealer shows a 5 or a 6. A player to your left says you should split, another says never split 4s, and the dealer waits. The decision is not a matter of feel or table mood. It follows from the rule set in front of you, and for most common rule sets the answer is consistent: split 4s only when the dealer's upcard is a 5 or a 6, and only when the table lets you double after splitting. Against every other upcard, you treat the hand as a total of 8 and hit.
That sentence is the practical rule. The rest of this article explains why it holds, where it breaks, and what to check on the table before you act.
What a Pair of 4s Is
Two 4s are not a strong hand. As a total of 8, the hand needs another card to become competitive, and the most common draw is a ten-value card, which would leave you on 18. That sounds fine until you remember the dealer's position: a dealer showing a 5 or a 6 is in the weakest visible position on the table, because the dealer must draw to at least 17 and will frequently bust from those upcards. Your 8 against a dealer 5 or 6 is a hand you want to put more money behind, but not by standing on 8. You want to split.
Splitting separates the 4s into two starting hands, each beginning with a 4. You pay an additional wager equal to your original bet, and you play each hand independently. A 4 is a decent starting point for a double down: if you draw a 5, 6 or 7, you have 9, 10 or 11 and can double against the dealer's weak upcard. That is the entire logic of the split. You are not splitting because two 4s are powerful. You are splitting because the dealer's 5 or 6 makes each new hand a candidate for a profitable double.
Against a dealer 2, 3, 4, 7, 8, 9, 10 or ace, the arithmetic changes. A dealer 2 or 3 is not as weak as it looks, because the dealer's hole card is often a ten, giving a total of 12 or 13 that can still improve. A dealer 7 or higher is a made or makeable hand. Splitting 4s against those upcards turns one mediocre hand into two mediocre hands, each requiring an extra bet, without the compensating chance to double into a dealer bust. So you hit the 8 and keep your exposure to a single wager.
The Decision Table
The table below summarises the standard decision for a pair of 4s under a common rule set: double after split allowed, dealer stands on soft 17, and any number of decks. If your table differs on any of those rules, the decision can change, and the table rules printed on the layout or the game information panel should be checked before you rely on it.
| Dealer upcard | Action on a pair of 4s | Reason |
|---|---|---|
| 5 or 6 | Split | Dealer is most likely to bust; each new 4 can double into a strong total |
| 2, 3, 4 | Hit | Dealer is not weak enough to justify two extra wagers |
| 7, 8, 9, 10, ace | Hit | Dealer has a made or makeable hand; splitting doubles your exposure without an edge |
One rule variant flips the decision. If the table does not allow doubling after a split, then the main reason to split 4s disappears. Without the double-down option, each new hand starting with a 4 is just a weak hand that must be hit, and the split becomes worse than hitting the original 8. On a no-double-after-split table, the correct play against a dealer 5 or 6 is to hit the 8, not split. This is why the exact rule set matters: the same pair of cards is played differently on two tables sitting side by side in the same room.
How the Round Plays Out
From buy-in to settlement, the sequence around a split decision follows the same structure as any blackjack hand, with one extra step. You place your initial wager in the betting circle. The dealer deals two cards to each player and two to the house, one up and one down. When your turn arrives and you hold two 4s, you announce the split and place a second wager equal to the first in the circle next to your original bet. The dealer separates the cards and deals a second card to the first 4. You play that hand to completion: hit, stand, or double if the rules allow and the situation calls for it. Then the dealer deals a second card to the other 4, and you play that hand to completion. Only after both hands are finished does the dealer reveal the hole card and play the dealer hand.
A common procedural mistake is to place the second wager and then touch the cards or move them yourself. In most shoe-dealt games, players do not touch the cards at all; in hand-held games, the dealer handles the split. Either way, the dealer controls the physical separation. Another mistake is to split and then play the first hand as if the second does not exist, forgetting that the second hand also needs a decision. A third is to split 4s against a dealer 7 or higher out of frustration with a run of bad hands. The decision table does not change because you are losing.
Where the Edge Comes From
Every blackjack decision changes the expected loss on a hand, not the certainty of the outcome. Splitting 4s against a dealer 5 or 6 is the lower-expected-loss play under the common rule set. It does not promise a win. The dealer will sometimes draw to 21 from a 6, and both split hands will sometimes lose. What the decision does is reduce the average amount the house keeps per unit wagered over many identical situations. Hitting the 8 against a dealer 5 is not a catastrophic error, but it gives away a small amount of expected value compared with splitting, and those small amounts accumulate over a session.
The same logic applies to every pair decision in blackjack. Pairs of aces and 8s are split almost universally because the alternatives are worse. Pairs of 10s are never split because 20 is already a strong made hand. Pairs of 5s are never split because 10 is a better starting point for a double than a single 5. Each rule exists because of the dealer's upcard and the specific rule set, not because of tradition or superstition.
What the Strategy Chart Is
A published basic-strategy chart is a grid of decisions derived from a specific rule set: the number of decks, whether the dealer stands or hits on soft 17, whether doubling after splitting is allowed, whether surrender is offered, and whether resplitting is permitted. Change one of those rules and some cells on the chart move. A chart that says to split 4s against a 5 or 6 is describing a game where double after split is allowed. The same chart would say to hit if that rule were absent.
This is why a chart from one source can contradict a chart from another source, and why neither is wrong. They are describing different games. Before you use a chart at a table, check the felt or the game information panel for the rule set, and make sure the chart you are using was built for that rule set. The pair of 4s is one of the clearest examples of a decision that flips entirely on a single rule.
FAQ
Should I split 4s against a dealer 6?
Yes, under the standard rule set where doubling after a split is allowed. The dealer's 6 is a weak upcard, and each new hand starting with a 4 has a realistic chance to become a double-down hand. If the table does not allow doubling after splitting, hit the 8 instead.
Why would anyone hit 8 instead of splitting 4s?
Because splitting doubles the amount of money at risk, and against most dealer upcards the two new hands are not strong enough to justify the extra wager. The only upcards that make the split worthwhile are 5 and 6, and only when the double-after-split rule is in force.
Does the number of decks change the 4s decision?
Not in the standard case. The split-4s-against-5-or-6 rule holds across the common deck counts when double after split is allowed. What changes the decision is the double-after-split rule itself, along with any unusual rule such as restrictions on resplitting or doubling. Always read the table's posted rules before applying a chart.
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