Basic Strategy Explained
The mathematically optimal play for every hand — memorize it once, play forever.
Blackjack is the only casino game where the correct play has already been solved. Computers ran billions of simulations and found the mathematically best decision for every possible hand. That solution is called basic strategy, and learning it cuts the house edge from around 2% down to about 0.5% — better than almost anything else on the floor.
Why Basic Strategy Works
Every blackjack decision is a math problem with a knowable answer. Given your total and the dealer's visible card, one play is statistically better than all others. Basic strategy is the complete list of those right answers.
Playing basic strategy turns blackjack into the best game in the casino. A house edge of ~0.5% means for every $100 wagered, the house mathematically keeps only 50 cents on average. Compare that to American roulette (5.26%) or slots (4–12%).
The strategy breaks into three types of hands: hard totals (hands without a flexible Ace), soft totals (hands where an Ace counts as 11), and pairs (matched cards where splitting is an option).
Hard Totals
A hard total is any hand where an Ace either isn't present, or counts as 1 because counting it as 11 would bust. These are the most common decisions at the table.
Soft Totals
A soft total has an Ace counting as 11 — which means you can't bust with one more card. That changes the math completely. Soft hands are aggressive opportunities, not defensive ones.
Pairs (Splitting)
When you're dealt two of the same card, you can split them into two separate hands — but only if the math supports it. Split incorrectly and you're turning one loss into two.
The Rules You Should Never Forget
If you remember nothing else, remember these. They come up constantly and most losing players get at least one wrong.
Split Aces and 8s
Every time. No exceptions. Two Aces are a terrible 12 together but two powerful starting hands split. Two 8s are a brutal 16 but become two workable 8s.
Split 10s or 5s
10s already give you 20 — a near-certain winner. 5s give you 10, a strong doubling hand. Splitting either ruins a good thing.
Double Hard 11
Against any dealer card 2 through 10. You have a 4-in-13 chance of hitting 21 on the next card. Capitalize on it.
Take Insurance
The side bet is a sucker bet with ~7.4% house edge — worse than the main game. Just decline it, always.
Stand on Hard 17+
Hitting a 17 almost always busts. The only exception some players argue is soft 17 vs. Ace — the chart handles that.
Hit Hard 12 vs. Dealer 2 or 3
Counterintuitive but correct. With a 2 or 3 showing, the dealer is slightly less likely to bust, so you're better off risking a card.
Common Mistakes That Bleed Money
Standing on 16 vs. Dealer 7–A
It feels wrong to hit 16, but dealer 17+ beats you anyway. Hitting is the least bad option.
Not Doubling Soft Hands
Soft 13–18 against dealer 5 or 6 should almost always be doubled. Most beginners hit instead.
Hitting Soft 18 vs. Dealer 9 or 10
This feels dangerous but is correct. An 18 loses too often to dealer 19+ to just stand.
Splitting Face Cards
Classic greed move. Two 10s = 20, one of the best hands possible. Don't give that up chasing two separate 20s.
Playing by "Gut Feeling"
Gut is the house's best friend. The chart is right. You are wrong. Trust the chart until it becomes gut.
How to Actually Memorize It
1. Start with the 6 rules above. Get those automatic first.
2. Print a pocket chart. Most casinos allow you to reference one at the table. If not, use a free blackjack trainer app (there are dozens).
3. Play low-stakes tables while practicing. $5 tables are for learning, not winning big. Treat every hand as a quiz.
4. Expect it to take 2–3 sessions. After a few thousand hands, the chart becomes instinct.
Basic strategy assumes standard rules (dealer stands on soft 17, double after split allowed, blackjack pays 3:2). If the table pays 6:5 on blackjack, walk away — that single rule triples the house edge. No strategy fixes a bad table.
The One Thing to Remember
Basic strategy is not a system — it's the answer key. The house already published the test. You just have to copy.
Pull up a chair for these next.
Frequently asked questions
The questions visitors ask most often.
Is this chart the same at every casino?
The fundamentals are the same anywhere — but two rule variations shift several plays: whether the dealer hits or stands on soft 17, and whether doubling after splitting is allowed. The chart on this page is the canonical multi-deck S17 (dealer stands on soft 17), DAS allowed. If your casino runs H17, the basic strategy shifts on a handful of soft hands and a couple of doubles. Worth checking before sitting down.
Do I have to memorize the whole thing?
Eventually yes, if you want the full edge. But most hands are obvious or come up rarely. Start with hard totals (most frequent), then soft totals, then pairs. Surrender is a small section worth its own pass. Free trainer apps drill the rare spots until they're automatic.
Can I bring this chart to a casino?
At most US casinos, yes — pulling out a phone or printed chart at a blackjack table is allowed. Some operators frown on it, a few will ask you to put it away. It's almost never thrown out as a security issue (it's not card counting — it's just the math). Best practice: glance at it on bathroom breaks. Don't make the rest of the table wait.
Why does basic strategy say to hit 12 vs. dealer 2 or 3?
This trips up almost every beginner — it feels wrong to hit a 12 against a small dealer up card. The math: dealer is least likely to bust on a 2 or 3 (because they have to keep drawing until 17+, and with a low up card they often make a good hand). Standing on 12 wins less often than hitting and risking the bust. The chart's right. Trust it.
What's the difference between S17 and H17?
S17 = dealer Stands on soft 17 (an ace counted as 11 plus a 6). H17 = dealer Hits soft 17. H17 gives the casino an extra ~0.2% edge because the dealer can keep improving from 17. Basic strategy compensates with a few aggressive double-downs against H17 dealers — the changes hit A-2 through A-7 vs 2 and a couple other spots. Most Strip casinos run H17 now; many off-Strip and most online tables run S17.
How long does it take to learn?
You can be 95% accurate in a weekend with focused practice — running through free online trainers for an hour or two until the obvious plays are automatic. Getting to 99%+ on the rare deviations takes a few weeks of regular practice. After that, basic strategy is muscle memory and you can think about the more interesting parts of the game.