Blackjack is unique among casino table games because it is not purely a game of chance. While the deal of the cards remains completely random, every decision you make after receiving your initial hand alters the mathematical probability of winning. Professional gamblers and mathematicians spent decades running millions of computer simulations to determine the exact, mathematically optimal move for every possible hand combination. This science is known as basic strategy.
Learning basic strategy does not eliminate the house edge entirely, but it compresses that edge down to its absolute minimum, often below one percent. Understanding when to hit, stand, double down, or split transforms blackjack from an expensive guessing game into a game of calculated skill. This cheat sheet breaks down the core principles of basic strategy to help you make the right mathematical move on every single hand.
The Core Decisions Explained
Before diving into specific scenarios, it helps to understand the four primary actions available to a player after receiving their first two cards. Each action serves a distinct mathematical purpose depending on the dealer face-up card.
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Hit: Request another card from the dealer. You choose this option when your hand total is too low to compete and you need to improve your score without risking a bust.
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Stand: Keep your current hand and end your turn. You choose this option when your total is strong enough or when taking another card carries an unacceptably high risk of busting.
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Double Down: Double your original wager in exchange for receiving exactly one final card. This is an aggressive maneuver executed when the mathematical odds heavily favor your hand improving against a weak dealer card.
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Split: If your first two cards share the exact same numerical value, you can split them into two separate hands by placing a second bet equal to your original wager.
Hard Totals Strategy
A hard total is any two-card hand that does not contain an Ace, or a hand where an Ace is valued strictly at one point because counting it as eleven would cause the hand to bust. Hard totals require the most caution because a single high card can easily push your hand past twenty-one.
High Hard Totals
When your hard total reaches seventeen or higher, the mathematical rule is simple and absolute.
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Always Stand on 17 through 21: No matter what card the dealer is showing, hitting a hard seventeen or higher will result in an immediate bust far too often. Even if the dealer shows an Ace or a ten, standing gives you the best statistical chance of a push or a win if the dealer busts.
Medium Hard Totals
Hands totaling between thirteen and sixteen are often called stiff hands because you are likely to bust if you hit, yet standing leaves you vulnerable if the dealer has a strong upcard.
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Stand Against Dealer 2 through 6: If your total is thirteen, fourteen, fifteen, or sixteen, and the dealer shows a weak upcard between two and six, you should stand. The dealer is statistically favored to bust from these starting cards.
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Hit Against Dealer 7 through Ace: If you hold a hard twelve through sixteen and the dealer shows a seven or higher, basic strategy dictates that you must hit. The dealer is likely to make a hand, forcing you to take a risk to catch up.
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Always Hit 12 Against Dealer 2 or 3: A starting hard twelve is an awkward hand. While you stand against a four, five, or six, basic strategy requires you to hit against a dealer two or three.
Low Hard Totals
Low hard totals offer zero risk of busting on the next hit, making them prime opportunities for aggressive play or guaranteed hits.
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Always Hit 11 or Less: If your hard total is eight or lower, you must always hit.
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Double Down on 10 and 11: If you hold a hard ten, double down against any dealer card lower than a ten or an Ace. If you hold a hard eleven, double down against any dealer card except an Ace.
Soft Totals Strategy
A soft total is any hand containing an Ace that is currently counted as eleven points without causing the hand to bust. Soft hands are powerful because the Ace acts as a flexible cushion, allowing you to take a hit without any fear of busting on that turn.
Soft 19 and 20
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Always Stand on Soft 19 and 20: These hands are exceptionally strong. Hitting would ruin a winning position, and doubling down is rarely permitted or mathematically necessary here.
Soft 17 and 18
Soft seventeen and eighteen are versatile hands where your strategy shifts based entirely on the vulnerability of the dealer.
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Double Down on Soft 18 Against Dealer 2 through 6: If you hold an Ace and a seven, your total is eighteen. Against a weak dealer card like a five or six, you should double down to maximize your payout. Hit against a nine, ten, or Ace, and stand against a seven or eight.
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Double Down on Soft 17 Against Dealer 3 through 6: An Ace-six combination should be doubled against dealer cards three through six. Otherwise, always hit a soft seventeen.
Low Soft Totals
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Double Down on Soft 13 through 16 Against Dealer 5 or 6: These lower soft hands benefit greatly from doubling down when the dealer is showing a weak five or six. In all other scenarios, treat these hands as simple hits.
The Rules of Splitting Pairs
Splitting pairs can turn a mediocre starting hand into two profitable opportunities, but splitting incorrectly can quickly drain your bankroll.
Aces and Eights
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Always Split Aces: Splitting a pair of Aces gives you two starting hands with an automatic value of eleven, setting you up for potential blackjacks or strong soft totals. Most casinos only allow you to receive one additional card per Ace when split.
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Always Split Eights: A pair of eights equals sixteen, which is statistically one of the worst hands in blackjack. Splitting them gets you away from a bad total and gives you two separate chances to start fresh with an eight.
Fives and Tens
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Never Split Tens: A pair of tens gives you a hard twenty. Splitting a twenty destroys one of the best hands in the game.
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Never Split Fives: A pair of fives equals a hard ten, which is a prime candidate for doubling down. Splitting fives turns two strong ten-value cards into weak starting hands.
Intermediate Pairs
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Split Twos, Threes, and Sevens: Split these pairs when the dealer shows a card from two through seven.
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Split Sixes: Split sixes against a dealer two through six.
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Split Nines: Split nines against a dealer two through six, eight, or nine. Stand against a seven, ten, or Ace.
Frequently Asked Questions
What is the house edge in blackjack if I use basic strategy?
When a player strictly follows basic strategy on a standard table with player-favorable rules, the house edge can drop as low as zero point five percent. This makes blackjack one of the most mathematically favorable games in the casino for the player.
Does basic strategy change depending on how many decks are in the shoe?
Minor adjustments exist between single-deck, double-deck, and six-to-eight-deck games, but core basic strategy remains remarkably consistent. The deviations for multi-deck games primarily affect a few specific double-down and surrender choices rather than standard hits and stands.
Why should I never take insurance in blackjack?
Insurance is a side bet offered when the dealer shows an Ace, allowing you to wager that the hidden hole card is a ten-value card. Mathematically, the true odds of the dealer having a blackjack do not pay out at the two-to-one ratio offered by the house, making insurance a losing proposition over the long run.
What does surrender mean and when should I use it?
Surrender is a rule offered at some tables allowing you to forfeit half your bet and immediately fold your hand before taking further action. You should surrender worst-case totals like a hard sixteen against a dealer ten or Ace, as your mathematical chance of winning from that position is extremely low.
Are table rules regarding the dealer soft seventeen important?
Yes, whether a dealer must hit or stand on a soft seventeen significantly impacts the house edge. A game where the dealer stands on all soft sevenths is more favorable to the player than a game where the dealer hits on a soft seventeen.
How does card counting fit into basic strategy?
Card counting does not replace basic strategy; it builds upon it. Counters memorize basic strategy and make minor mathematical deviations based on the remaining ratio of high cards to low cards left in the shoe, allowing them to raise their bets when the deck favors the player.
Is it better to sit at a specific seat at the blackjack table?
Seat position does not mathematically affect your odds of winning. The cards dealt are entirely random, and the actions of players seated before or after you do not statistically alter the cards you will receive over the course of a gaming session.