Every hand. Every dealer card. Every correct play — explained.
In casino culture, experienced players and dealers refer to basic strategy as "The Book." It is the mathematically optimal way to play every blackjack hand, calculated through millions of computer simulations. When you follow The Book perfectly, the house edge drops to roughly 0.5% — making blackjack the best odds in any casino.
Most strategy guides give you a chart and tell you to memorize it. We're going to do better than that. Below, every play is explained so you understand not just what to do, but why. Understanding the reasoning makes the plays stick — and helps you stay disciplined at the table when emotions run high.
This guide covers standard 6-deck blackjack where the dealer stands on soft 17 and double after split is allowed.
A hard hand is any hand without an ace counting as 11, or any hand where the ace must count as 1 to avoid busting. These are the most common hands you'll face, and they're where most players make the most mistakes.
The core principle is simple: the dealer's up card tells you how aggressive to be. When the dealer shows a weak card (2 through 6), they have a higher chance of busting, so you can afford to stand on lower totals. When the dealer shows a strong card (7 through Ace), they're likely to make a good hand, so you need to improve yours.
If your hard total is 8 or below, HIT regardless of what the dealer shows. You cannot bust by taking one card, and your hand is too weak to stand on. There's no scenario where staying on 8 or less makes mathematical sense — you need improvement and there's zero risk in asking for it.
With a hard 9, DOUBLE DOWN when the dealer shows 3 through 6. Against dealer 2 and 7 through Ace, HIT.
Why double against 3-6? Your 9 has a good chance of reaching 19 (by drawing a 10-value card, which makes up roughly 30% of the deck). When the dealer is showing a weak card, they're more likely to bust, so you're in a favorable position to put more money on the table. Against a dealer 2 or 7+, the advantage isn't quite strong enough to justify doubling your bet.
With a hard 10, DOUBLE DOWN against dealer 2 through 9. Against a dealer 10 or Ace, HIT.
Why? A hard 10 is one of the strongest doubling hands in blackjack. About 30% of the time you'll draw a 10-value card for a total of 20, and another 7-8% of the time you'll draw an Ace for 21. That's nearly a 40% chance of making 20 or 21 with one card. The only time you don't double is when the dealer also has a strong card (10 or Ace) — because then they're likely to match or beat your hand even if you hit 20.
Hard 11 is the best doubling hand in blackjack. DOUBLE DOWN against every dealer card, no exceptions.
Why always? With 11, you can't bust by taking one card, and you have the highest possible chance of landing on 21. Even against a dealer Ace, the expected value of doubling with 11 is higher than just hitting. This is the one hand where the math says "put your money in" regardless of what the dealer shows.
Hard 12 is where blackjack starts getting uncomfortable. STAND against dealer 4, 5, and 6. HIT against everything else (including dealer 2 and 3).
Why hit against a dealer 2 or 3? This surprises many beginners who've heard "never hit when the dealer might bust." The truth is, a dealer showing 2 or 3 busts less often than you'd think — about 35% for a 2 and 37% for a 3, compared to 42% for a 6. Meanwhile, your 12 only busts 31% of the time when you hit. The math favors taking the card. Against 4, 5, and 6, the dealer's bust probability is high enough (40-42%) that standing with 12 becomes the better play.
With a hard 13 or 14, STAND when the dealer shows 2 through 6. HIT against 7 through Ace.
The logic: Against dealer weak cards (2-6), you're hoping the dealer busts. Your 13 or 14 is a mediocre hand, but the dealer is in trouble — hitting with a weak card often leads to a bust. Against strong dealer cards (7+), the dealer is very likely to make 17 or better, which beats your 13 or 14. You have to take the risk of busting to try to improve.
STAND against dealer 2 through 6. HIT against dealer 7 and 8. SURRENDER against dealer 9, 10, and Ace (if surrender isn't available, hit).
Why surrender? Hard 15 against a dealer 9, 10, or Ace is one of the worst positions in blackjack. You'll lose more than 50% of the time whether you hit or stand. Surrender lets you forfeit half your bet instead of playing out a losing hand. It feels wrong to give up, but losing 50 cents on the dollar is better than losing 60+ cents on the dollar by playing it out. If the table doesn't offer surrender, hit — standing is even worse.
STAND against dealer 2 through 6. HIT against dealer 7. SURRENDER against dealer 8, 9, 10, and Ace (hit if surrender isn't available).
Why is 16 so hard? Hard 16 is statistically the worst hand in blackjack. If you hit, you bust 62% of the time. If you stand against a dealer 10, you lose about 77% of the time. There's no good option — only a less bad one. Against dealer 8 through Ace, surrendering loses you exactly 50% of your bet, which is mathematically better than either hitting or standing. Against a dealer 7, the surrender threshold isn't quite reached, so hit. Against 2-6, stand and hope the dealer busts.
With a hard 17 or above, STAND against every dealer card. The one exception: hard 17 against a dealer Ace — SURRENDER if available (otherwise stand).
Why? Once you reach 17+, the risk of busting by hitting is too high. A hard 17 will bust 69% of the time if you take a card. Even though 17 is a weak standing hand (the dealer pushes you frequently), standing still loses less money than hitting. Against a dealer Ace specifically, surrendering 17 saves you a fraction more than standing, but this is a very marginal play — if your table doesn't offer surrender, stand without hesitation.
A soft hand contains an Ace that counts as 11 without busting. Soft hands are special because they give you a safety net: if you hit and the total goes over 21, the Ace automatically counts as 1 instead of 11, so you can never bust on one hit with a soft hand.
This safety net changes the strategy dramatically. Because you can't bust, you should play soft hands more aggressively than hard hands with the same total. A soft 17 (Ace-6) plays completely differently than a hard 17 (10-7).
DOUBLE DOWN against dealer 5 and 6. HIT against everything else.
Why only 5-6? Soft 13 and 14 are low totals that need improvement. Against the dealer's two weakest cards (5 and 6, which bust 42-43% of the time), there's enough advantage to justify doubling. Against other dealer cards, the advantage isn't sufficient — just hit and try to improve your hand without the extra bet at risk.
DOUBLE DOWN against dealer 4, 5, and 6. HIT against everything else.
Why expand to include 4? With slightly better starting totals (15-16 vs. 13-14), the doubling range widens to include a dealer 4, which busts about 40% of the time. The extra half-point of expected value from your higher total makes the double profitable against one additional dealer card.
DOUBLE DOWN against dealer 3 through 6. HIT against everything else. Never stand on soft 17.
This is the play most beginners get wrong. Soft 17 feels like a "good enough" hand to stand on — after all, the dealer must stand on 17, right? But you're not the dealer. Unlike hard 17, soft 17 cannot bust when you hit, and 17 is actually a losing hand against most dealer up cards. By hitting (or doubling against weak dealers), you have a real chance to improve to 18, 19, 20, or 21. Standing on soft 17 is one of the most costly mistakes in blackjack.
DOUBLE DOWN against dealer 2 through 6 (stand if doubling isn't allowed). STAND against dealer 7 and 8. HIT against dealer 9, 10, and Ace.
Why hit 18 against a 9, 10, or Ace? This is another play that shocks beginners. Soft 18 feels strong — most hands don't reach 18. But against a dealer 9, 10, or Ace, 18 is actually an underdog. The dealer will beat 18 more often than not with those up cards. Because your hand is soft, you can hit without risk of busting. You're not trying to "improve" 18 so much as giving yourself a chance at 19, 20, or 21 when 18 isn't good enough to win.
Soft 19: STAND against almost everything. The one exception: DOUBLE DOWN against a dealer 6 if allowed (otherwise stand).
Soft 20: STAND always. No exceptions.
Why? At 19+, your hand is strong enough to beat most dealer outcomes. Soft 20 is nearly unbeatable — only a dealer 21 beats you. Soft 19 doubles against a 6 because the dealer's bust probability is so high that getting extra money in is profitable, but against everything else, 19 is a winning hand as-is. Don't get greedy.
When you're dealt two cards of the same value, you have the option to split them into two separate hands, each receiving a new card. Splitting costs an additional bet equal to your original wager.
Splitting is not always the right play. Some pairs should always be split, some should never be split, and some depend on the dealer's up card. The question is always: does playing two hands from this starting point give better expected value than playing one hand?
SPLIT Aces against every dealer card, always.
Why? A pair of Aces is a soft 12 (or a hard 2) — a terrible hand either way. But each individual Ace is the best possible starting card for a new hand. Drawing a 10-value card (roughly 30% probability) gives you 21 on each split hand. You're turning one bad hand into two hands that each have an excellent chance of becoming 21. This is the most profitable split in blackjack.
SPLIT 8s against every dealer card, including 10 and Ace.
Even against a 10 or Ace? Yes. A hard 16 (8+8) is the worst hand in blackjack — you'll lose money no matter what you do. By splitting, you turn one terrible hand into two hands starting at 8, which is a much more workable number. You'll still lose more often than you win against strong dealer cards, but you'll lose less than you would playing 16. Splitting 8s against a dealer 10 or Ace is damage control, not a power play.
STAND on a pair of 10s. Never split them.
Why? A pair of 10s gives you 20 — the second-best hand in blackjack, beaten only by 21. Splitting 20 to create two hands starting from 10 gives you two decent hands, but neither is as strong as the 20 you already had. You're trading a near-certain win for two coin flips. The expected value of standing on 20 is significantly higher than splitting in every scenario.
Never split 5s. Treat the hand as a hard 10 and follow the hard hands strategy: DOUBLE DOWN against dealer 2 through 9, HIT against 10 and Ace.
Why? A pair of 5s gives you hard 10, which is one of the best doubling hands in blackjack. Splitting would give you two hands starting from 5 — terrible starting points. You'd be turning a strong hand into two weak ones. Always play 5-5 as a 10.
SPLIT 2s and 3s against dealer 2 through 7. HIT against 8 through Ace.
Why? Low pairs (4 or 6 total) are weak hands. Against dealer weak-to-moderate cards (2-7), splitting gives you two chances to build reasonable hands. Against dealer 8+, the dealer's position is too strong for the split to be profitable — just hit and try to improve your single hand.
SPLIT 4s against dealer 5 and 6 only. HIT against everything else.
Why so narrow? A pair of 4s gives you 8 — not a great hand, but not terrible. Splitting only makes sense against the dealer's two weakest cards, where the bust probability is high enough to justify creating two hands starting from 4. Against all other cards, your 8 is a better starting point than two separate 4s.
SPLIT 6s against dealer 2 through 6. HIT against 7 through Ace.
Why? A pair of 6s gives you hard 12. Against dealer weak cards (2-6), you'd normally stand on 12 (against 4-6) or hit (against 2-3). Splitting gives you two hands starting from 6, each with a chance to draw a 10-value card for 16, or a 5 for 11 (a strong position). Against dealer 7+, the dealer is too strong to justify the extra bet.
SPLIT 7s against dealer 2 through 7. HIT against 8 through Ace.
Why? A pair of 7s is hard 14 — a hand you'd stand with against weak dealers and hit against strong ones. Splitting gives you two hands starting from 7, each capable of reaching 17 with a 10-value card. The split is profitable against dealer 2-7 but not against 8+, where the dealer is likely to end with 18+ and beat both your split hands.
SPLIT 9s against dealer 2 through 6, 8, and 9. STAND against dealer 7, 10, and Ace.
Why stand against a 7? This is one of the more nuanced splits. A pair of 9s gives you 18, which beats a dealer 17. A dealer showing 7 is most likely to make 17 (by drawing a 10-value card). So your 18 is a winning hand as-is — don't mess with it. Against a dealer 10 or Ace, 18 will often lose, but splitting into two 9s still doesn't improve things enough to justify the extra bet. Against 2-6, 8, and 9, the split creates better expected value than standing on 18.
For quick reference, here are the complete strategy charts. Use the text explanations above to understand the reasoning, and these charts for fast lookup.
| 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | A | |
|---|---|---|---|---|---|---|---|---|---|---|
| 8 | H | H | H | H | H | H | H | H | H | H |
| 9 | H | D | D | D | D | H | H | H | H | H |
| 10 | D | D | D | D | D | D | D | D | H | H |
| 11 | D | D | D | D | D | D | D | D | D | D |
| 12 | H | H | S | S | S | H | H | H | H | H |
| 13 | S | S | S | S | S | H | H | H | H | H |
| 14 | S | S | S | S | S | H | H | H | H | H |
| 15 | S | S | S | S | S | H | H | H | Rh | Rh |
| 16 | S | S | S | S | S | H | H | Rh | Rh | Rh |
| 17 | S | S | S | S | S | S | S | S | S | Rs |
| 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | A | |
|---|---|---|---|---|---|---|---|---|---|---|
| A,2 | H | H | H | D | D | H | H | H | H | H |
| A,3 | H | H | H | D | D | H | H | H | H | H |
| A,4 | H | H | D | D | D | H | H | H | H | H |
| A,5 | H | H | D | D | D | H | H | H | H | H |
| A,6 | H | D | D | D | D | H | H | H | H | H |
| A,7 | Ds | Ds | Ds | Ds | Ds | S | S | H | H | H |
| A,8 | S | S | S | S | Ds | S | S | S | S | S |
| A,9 | S | S | S | S | S | S | S | S | S | S |
| 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | A | |
|---|---|---|---|---|---|---|---|---|---|---|
| 2,2 | P | P | P | P | P | P | H | H | H | H |
| 3,3 | P | P | P | P | P | P | H | H | H | H |
| 4,4 | H | H | H | P | P | H | H | H | H | H |
| 5,5 | D | D | D | D | D | D | D | D | H | H |
| 6,6 | P | P | P | P | P | H | H | H | H | H |
| 7,7 | P | P | P | P | P | P | H | H | H | H |
| 8,8 | P | P | P | P | P | P | P | P | P | P |
| 9,9 | P | P | P | P | P | S | P | P | S | S |
| 10,10 | S | S | S | S | S | S | S | S | S | S |
| A,A | P | P | P | P | P | P | P | P | P | P |
Legend: H = Hit, S = Stand, D = Double (hit if can't), Ds = Double (stand if can't), P = Split, Rh = Surrender (hit if can't), Rs = Surrender (stand if can't)
Years of dealing have shown that certain hands trip up even experienced players. Here are the most commonly misplayed hands and why The Book's answer is correct.
Most players: Stand ("the dealer might bust")
The Book says: HIT
A dealer 2 only busts 35% of the time. Your 12 only busts 31% of the time when you hit. Standing on 12 against a 2 loses about 29 cents per dollar bet; hitting loses about 25 cents. That 4-cent difference adds up over thousands of hands.
Most players: Stand ("18 is a good hand")
The Book says: HIT
Against a dealer 9, your soft 18 wins only about 40% of the time and loses about 54%. Hitting gives you a chance to improve to 19-21 without any risk of busting (because it's soft). Standing on 18 against strong dealer cards is one of the most expensive common mistakes.
Most players: Hit ("I'm not putting more money against a 10")
The Book says: SPLIT
Nobody loves splitting 8s against a 10. But hard 16 is a disaster — you lose about 54 cents per dollar bet whether you hit or stand. Splitting loses about 48 cents per dollar bet (across both hands combined). You're still losing, but you're losing less. That's what basic strategy is really about: not winning every hand, but losing less over time.
Most players: Stand ("I don't want to bust")
The Book says: SURRENDER (or hit if surrender isn't available)
Standing on 16 against a 10 loses about 54% of the time. Hitting busts 62% of the time but wins more of the remaining hands. Surrendering costs exactly 50 cents per dollar. It's the mathematically cheapest option. If surrender isn't offered, hit — standing is the worst choice of the three.
Most players: Stand ("17 is fine")
The Book says: HIT (or DOUBLE vs. 3-6)
Soft 17 is not "fine." It's a losing hand against every dealer up card. But unlike hard 17, you can improve it without risk. Drawing a card gives you a shot at 18, 19, 20, or 21 — and if you draw a high card, the Ace just becomes a 1. Never stand on soft 17.
Basic strategy is a mathematically proven set of rules that tells you the optimal play for every possible blackjack hand. It was developed through computer simulations of millions of hands and reduces the house edge to approximately 0.5%. Players and dealers call it "The Book."
Yes. Basic strategy is mathematically proven to minimize the house edge. It won't guarantee you win every session — variance is real and the house still has a small edge — but it gives you the best possible odds on every single hand. Over thousands of hands, the difference between a basic strategy player and a gut-instinct player is enormous.
With perfect basic strategy on a standard 6-deck game where the dealer stands on soft 17, the house edge is approximately 0.5%. Without basic strategy, the average player faces a house edge of 2-5% depending on their mistakes. That means a basic strategy player loses roughly $5 per $1,000 wagered, while an average player loses $20-50.
Most players can learn the key plays in a few hours and master the complete strategy within a few weeks of practice. The fastest way to learn is through active practice — playing hands with immediate feedback on your decisions. That's exactly what our free trainer is built for.
No. Basic strategy is the optimal play assuming you don't know which cards remain in the shoe. It's completely legal and simply represents good math. Card counting is an additional technique that adjusts strategy based on tracking which cards have been dealt. Basic strategy is the foundation — card counting is the advanced layer built on top of it.
Slightly. The strategy on this page is optimized for the most common rules: 6-deck shoe, dealer stands on soft 17, double after split allowed. If the dealer hits soft 17, or if the game uses fewer decks, a handful of plays change. The core principles stay the same — the changes affect edge cases like doubling on soft 18 or splitting 3s.
Human intuition is bad at probability. Hitting 12 against a 3 feels risky because you might bust — but standing is actually worse. Splitting 8s against a 10 feels like throwing money away — but playing 16 as one hand is even more expensive. The Book often contradicts gut feelings, which is exactly why it works: the math doesn't care how a play "feels."
Reading about strategy is step one. The real learning happens when you practice hands with immediate feedback. StrikeBack BlackJack is a free trainer that deals you real blackjack hands and tells you instantly whether your play matches The Book.
Already know the basics? Learn more about StrikeBack BlackJack or dive into the Galaxy of Fortune lore.