What Is Basic Strategy?
Blackjack is one of the few casino games where player decisions directly affect the house edge. Basic strategy is a mathematically derived set of decisions — hit, stand, double down, or split — that tells you the statistically optimal move for every possible hand combination against every possible dealer upcard.
Playing perfect basic strategy can reduce the house edge in standard blackjack to approximately 0.5% or lower, depending on the specific rules of the table.
Why Basic Strategy Works
Unlike pure luck-based games, blackjack involves incomplete information — you can see one of the dealer's cards. Basic strategy was developed through mathematical analysis and computer simulations of millions of hands. Each recommendation is based on which action produces the highest expected value over time.
Core Basic Strategy Principles
Hard Hands (No Ace, or 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 unless dealer shows a 10 or Ace.
- Hard 12–16: Stand if dealer shows 2–6 (bust range); hit against 7 or higher.
- Hard 17 or more: Always stand.
Soft Hands (Ace Counted as 11)
- Soft 13–15: Hit in most cases; double against dealer 4–6 if the table allows.
- Soft 16–18: Double against dealer 2–6 where possible; otherwise hit.
- Soft 19–21: Always stand.
Pairs (Splitting Decisions)
- Always split: Aces and 8s.
- Never split: 10s and 5s.
- Split 2s and 3s: Against dealer 2–7.
- Split 6s: Against dealer 2–6.
- Split 7s: Against dealer 2–7.
- Split 9s: Against dealer 2–6 and 8–9; stand against 7, 10, or Ace.
Table Rules That Affect Strategy
Basic strategy is not universal — it shifts slightly based on game-specific rules. Key variables include:
| Rule Variation | Effect on House Edge |
|---|---|
| Dealer stands on soft 17 | Reduces house edge (player-favorable) |
| Blackjack pays 3:2 | Standard; favorable |
| Blackjack pays 6:5 | Increases house edge significantly |
| Late surrender allowed | Reduces house edge |
| Double after split (DAS) | Slightly reduces house edge |
| Number of decks (fewer = better) | Fewer decks favor the player |
Common Mistakes to Avoid
- Always taking insurance — statistically a losing side bet for the player.
- Standing on 16 against a dealer 7+ — hitting gives you a better expected outcome.
- Splitting 10s — you already have a strong hand; splitting weakens it.
- Mimicking the dealer — always hitting until 17 ignores the strategic advantage you have over the dealer.
Using a Strategy Card
Most casinos — both online and land-based — permit players to reference a basic strategy card at the table. Using one is not cheating; it's simply informed play. Many online casinos even provide them in their help sections. Memorizing the key decisions takes time, but using a card in the meantime is always better than guessing.
Final Thought
Basic strategy doesn't guarantee wins — blackjack still involves variance. What it does is ensure you're making the mathematically sound decision every time, which gives you the best possible chance of a positive session over the long run.