What Is Basic Strategy?

Basic strategy in blackjack is a set of mathematically optimal decisions for every possible combination of your hand and the dealer's visible card. Developed through probability analysis, it doesn't guarantee wins — but it minimises the house edge to as low as 0.5% when applied consistently. It's the single most effective tool available to any blackjack player.

The Core Decisions in Blackjack

Every hand comes down to one of these choices:

  • Hit — Take another card.
  • Stand — Keep your current hand.
  • Double Down — Double your bet and receive exactly one more card.
  • Split — Divide a pair into two separate hands, each with its own bet.
  • Surrender — Forfeit half your bet to avoid playing a losing hand (available in some variants).

Key Basic Strategy Rules

Hard Hands (No Ace, or Ace Counted as 1)

  • Hard 8 or less: Always hit.
  • Hard 9: Double if dealer shows 3–6; otherwise hit.
  • Hard 10–11: Double if your total beats the dealer's upcard; otherwise hit.
  • Hard 12–16: Stand if dealer shows 2–6; hit if dealer shows 7 or higher.
  • Hard 17+: Always stand.

Soft Hands (Ace Counted as 11)

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

Pairs

  • Always split: Aces and 8s.
  • Never split: 10s and 5s.
  • Split 2s and 3s vs. dealer 2–7; otherwise hit.
  • Split 6s vs. dealer 2–6; otherwise hit.
  • Split 7s vs. dealer 2–7; otherwise hit.
  • Split 9s vs. dealer 2–6 and 8–9; stand vs. 7, 10, Ace.

Why You Should Never Take Insurance

When the dealer shows an Ace, you may be offered an insurance bet. Basic strategy clearly recommends declining insurance in almost all cases. The insurance side bet carries a house edge of around 7%, making it one of the worst bets at the table for the average player.

Common Mistakes to Avoid

  1. Standing on 16 vs. dealer 10 — hitting is statistically better.
  2. Not doubling on 11 — this is one of the most valuable opportunities in the game.
  3. Splitting 10s — a 20 is a strong hand; don't break it up.
  4. Playing by "feel" — emotional decisions consistently cost money over time.

Using a Strategy Card

Most online blackjack games allow you to consult a strategy card while playing. There's no rule against it, and doing so while you're learning is entirely reasonable. Over time, the decisions become second nature. Print one out or use a digital reference until you've memorised the key moves.

The Bottom Line

Basic strategy won't make every hand a winner, but it ensures you're always making the correct mathematical decision. Over hundreds of hands, the difference between playing by instinct and playing by strategy is measurable. Start here before exploring any advanced techniques.