What Is Basic Strategy?

Basic strategy is the mathematically optimal way to play every possible hand in blackjack. It tells you exactly when to hit, stand, double down, split, or surrender — based solely on your hand total and the dealer's upcard. Playing perfect basic strategy reduces the house edge to as low as 0.5% in favorable rule conditions, making blackjack one of the best bets in the casino.

Basic strategy was developed through rigorous statistical analysis and computer simulations. It doesn't guarantee you'll win every hand — no system can — but over thousands of hands, it ensures you're making the decision that loses the least (or wins the most) in every situation.

The Core Decision Hierarchy

When it's your turn to act, always check in this order:

  1. Can I surrender? — If surrender is available and correct, take it first.
  2. Should I split? — Only applies to pairs.
  3. Should I double down? — Check before deciding to hit or stand.
  4. Should I hit or stand? — The default decision.

Hard Hands: The Foundation

A "hard" hand contains no ace, or an ace counted as 1. Here are the key rules:

  • Hard 8 or less: Always hit — you cannot bust.
  • Hard 9: Double down if dealer shows 3–6; otherwise hit.
  • Hard 10 or 11: Double down unless the dealer's upcard matches or exceeds your total.
  • Hard 12: Stand against dealer 4–6; hit otherwise.
  • Hard 13–16: Stand against dealer 2–6; hit against 7 or higher.
  • Hard 17+: Always stand.

Soft Hands: Using the Ace

A "soft" hand contains an ace counted as 11. These hands give you extra flexibility because you can't bust on one more card.

  • Soft 13–14 (A-2, A-3): Double if dealer shows 5–6; otherwise hit.
  • Soft 15–16 (A-4, A-5): Double if dealer shows 4–6; otherwise hit.
  • Soft 17 (A-6): Double if dealer shows 3–6; otherwise hit.
  • Soft 18 (A-7): Double against 3–6; stand against 2, 7, 8; hit against 9, 10, Ace.
  • Soft 19–20: Always stand.

Splitting Pairs

Splitting pairs correctly is one of the biggest opportunities to gain an edge. The golden rules:

  • Always split Aces and 8s — no exceptions.
  • Never split 5s or 10s — a pair of 5s is better played as a 10; 10s make a strong 20.
  • Split 9s against dealer 2–6, 8–9; stand against 7, 10, Ace.
  • Split 7s against dealer 2–7; hit otherwise.
  • Split 6s against dealer 2–6; hit otherwise.
  • Split 2s and 3s against dealer 2–7; hit otherwise.

Doubling Down for Maximum Value

Doubling down is how you press your advantage when the situation is favorable. The key principle: double when you have a strong total and the dealer is likely to bust (showing a "bust card" of 4, 5, or 6).

Beyond hard 9, 10, and 11, soft doubling (doubling on soft hands) is a subtler but equally important skill outlined in the soft hands section above.

Surrender: The Overlooked Option

If your casino offers late surrender, use it on these hands against the correct dealer upcards:

  • Hard 16 (not a pair of 8s) vs. dealer 9, 10, or Ace
  • Hard 15 vs. dealer 10

Surrendering gives back half your bet — a better outcome than losing the full amount in a high-disadvantage situation.

How to Learn Basic Strategy

The best approach is to use a printed strategy card (legal at most casinos) while you play, then gradually memorize it through repetition. Free online trainers let you practice at home. Focus on learning the most common situations first — hard totals of 12–16 against dealer upcards of 2–9 account for the majority of difficult decisions you'll face at the table.

Consistent application of basic strategy is the single most impactful thing any blackjack player can do to improve their game.