What Is Basic Strategy?

Blackjack basic strategy is a set of mathematically proven decisions that tell you the best action — hit, stand, double down, split, or surrender — for every possible combination of your hand and the dealer's upcard. It was developed through computer simulations of millions of hands and removes guesswork entirely.

Playing perfect basic strategy can reduce the house edge to as low as 0.5%, making blackjack one of the best-value games in any casino.

The Core Principles

Before memorizing specific plays, understand the two fundamental rules that drive most basic strategy decisions:

  • The dealer must hit until reaching 17 or higher. This means the dealer busts more often when showing a low card (2–6).
  • You see one dealer card. Your decisions are based on probability given what that exposed card reveals about the dealer's likely total.

Hard Hands: Key Rules

A hard hand is any hand without an ace, or with an ace counted as 1.

  • Hard 8 or less: Always hit.
  • Hard 9: Double down if dealer shows 3–6; otherwise hit.
  • Hard 10–11: Double down when your total exceeds the dealer's upcard; otherwise hit.
  • Hard 12–16: Stand if dealer shows 2–6 (dealer is likely to bust); hit if dealer shows 7 or higher.
  • Hard 17+: Always stand.

Soft Hands: Key Rules

A soft hand contains an ace counted as 11. These hands are more flexible because you cannot bust on the next card.

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

Splitting Pairs

When dealt two cards of equal value, you may split them into two hands. Key splitting rules:

  • Always split: Aces and 8s.
  • Never split: 10s (you already have 20) or 5s (treat as hard 10 and double down instead).
  • Split 2s and 3s vs. dealer 2–7.
  • Split 6s vs. dealer 2–6.
  • Split 7s vs. dealer 2–7.
  • Split 9s vs. dealer 2–6 and 8–9; stand vs. 7, 10, ace.

Common Mistakes to Avoid

  1. Never take insurance — it's a side bet with a high house edge regardless of your hand.
  2. Don't stand on soft 18 vs. a dealer 9 or 10 — hitting gives you better expected value.
  3. Don't split 10s — a 20 is one of the strongest hands you can have.
  4. Don't mimic the dealer — always hitting to 17 ignores your ability to double and split.

Practice Makes Perfect

Basic strategy charts are freely available and legal to use in most casinos. Many players keep a printed strategy card at the table while they learn. You can also drill the decisions using free blackjack trainers online until the responses become automatic.

No strategy eliminates the house edge entirely, but basic strategy is the foundation of every advanced blackjack approach — and for most players, it's all they'll ever need.