What Is Blackjack Basic Strategy?
Basic strategy is a set of mathematically derived rules that tells you the statistically optimal decision for every possible hand combination in blackjack, given your cards and the dealer's visible card. It was developed through computer simulations running millions of hands and is widely published and legal to use.
Following basic strategy doesn't guarantee wins — blackjack still has a house edge — but it reduces that edge to its mathematical minimum, typically between 0.5% and 1% depending on the specific rules of the game being played.
The Core Decisions in Blackjack
Every hand requires one (or more) of these decisions:
- Hit: Take another card.
- Stand: Keep your current hand.
- Double Down: Double your bet and receive exactly one more card.
- Split: If you have two of the same card, split them into two separate hands (each with its own bet).
- Surrender: Forfeit half your bet rather than play the hand (not available at all tables).
Key Basic Strategy Rules to Memorise
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: Stand if dealer shows 4–6; otherwise hit.
- Hard 13–16: Stand if dealer shows 2–6; hit against 7 or higher.
- Hard 17+: Always stand.
Soft Hands (Hand Contains an Ace Counted as 11)
- Soft 13–14 (A-2, A-3): Double against dealer 5–6; otherwise hit.
- Soft 15–16 (A-4, A-5): Double against dealer 4–6; otherwise hit.
- Soft 17 (A-6): Double against dealer 3–6; otherwise hit.
- Soft 18 (A-7): Double against 2–6; stand against 7–8; hit against 9, 10, Ace.
- Soft 19–20: Always stand.
Pairs (Splitting Rules)
- Always split: Aces and 8s.
- Never split: 10s and 5s.
- Split 9s: Against dealer 2–6 and 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 4–7; hit otherwise.
- Split 4s: Only against dealer 5–6 (if doubling after split is allowed).
Rules That Affect the House Edge
Not all blackjack games are equal. These rule variations change the math significantly:
| Rule | Effect on House Edge |
|---|---|
| Blackjack pays 3:2 (standard) | Player-favourable |
| Blackjack pays 6:5 | Adds ~1.4% to house edge — avoid |
| Dealer stands on soft 17 | Player-favourable |
| Dealer hits on soft 17 | Adds ~0.2% to house edge |
| Double after split allowed | Player-favourable |
| Fewer decks in shoe | Player-favourable |
Common Beginner Mistakes
- Never splitting Aces or 8s: These are always splits, regardless of the dealer's upcard.
- Standing on 16 against a dealer's 7+: Your hand is weak anyway — hitting gives you a better statistical outcome.
- Taking insurance: Insurance is generally a poor side bet with a significant house edge. Basic strategy says to decline it.
- Playing hunches: Blackjack decisions should be mechanical, not emotional. The maths is already worked out — follow it.
Practice Makes Perfect
Many online casinos offer free-play blackjack in demo mode. Use this to drill basic strategy until decisions become automatic. You can also find printable basic strategy cards — these are legal to reference at most casinos and are an excellent learning tool.