What Is Basic Strategy?
Blackjack is one of the few casino games where your decisions directly impact the house edge. Basic strategy is a mathematically derived set of rules that tells you the optimal action — hit, stand, double, split, or surrender — for every possible hand combination against every possible dealer upcard. Played correctly, basic strategy can reduce the house edge to under 0.5%.
The Core Principles
Before diving into specific plays, understand the foundation:
- The dealer must hit until reaching 17 or higher
- You win if your total beats the dealer without exceeding 21
- Busting (going over 21) means an automatic loss, regardless of the dealer's hand
Hard Hands: When You Have No Ace (or Ace Counting as 1)
| Your Hand | Dealer Shows 2–6 | Dealer Shows 7–Ace |
|---|---|---|
| 8 or less | Hit | Hit |
| 9 | Double | Hit |
| 10–11 | Double | Double (hit if dealer has Ace) |
| 12–16 | Stand | Hit |
| 17–21 | Stand | Stand |
Soft Hands: When You Have an Ace Counting as 11
Soft hands give you flexibility because you can't bust on one more card.
- Soft 13–15 (A-2 to A-4): Double vs. dealer 4–6; otherwise hit
- Soft 16–17 (A-5, A-6): Double vs. dealer 3–6; otherwise hit
- Soft 18 (A-7): Double vs. dealer 3–6; stand vs. 7–8; hit vs. 9–Ace
- Soft 19–21: Always stand
Pairs: When to Split
Splitting pairs can turn a weak hand into two strong hands — or cost you double if done wrong.
- Always split: Aces and 8s
- Never split: 10s and 5s
- Split 2s, 3s, 7s: Against dealer 2–7
- Split 4s: Only against dealer 5–6
- Split 6s: Against dealer 2–6
- Split 9s: Against 2–9, except 7; stand against 7, 10, Ace
When to Surrender
Not all games offer surrender, but when they do, it allows you to forfeit half your bet rather than play a losing hand. Surrender is recommended with:
- Hard 16 vs. dealer 9, 10, or Ace
- Hard 15 vs. dealer 10
Common Mistakes to Avoid
- Always taking insurance — The insurance bet carries a high house edge and is not recommended in basic strategy.
- Standing on 12 vs. dealer 2 or 3 — Basic strategy says hit here; the dealer is more likely to beat a low stand.
- Not doubling on 11 vs. dealer 10 — Doubling is still mathematically correct in most standard games.
Practice Makes Perfect
Basic strategy is most effective when memorized, not just referenced. Many online casinos offer free-play modes — use them to drill these decisions until they become second nature. A printed strategy card is allowed in most brick-and-mortar casinos, too.