What Is Blackjack Basic Strategy?
Basic strategy is a set of statistically optimal decisions for every possible hand combination in blackjack. Developed through mathematical analysis and computer simulations, it tells you whether to hit, stand, double down, or split — based on your hand total and the dealer's visible card. When followed consistently, basic strategy reduces the house edge to roughly 0.5% or less, depending on the specific table rules.
This doesn't mean you'll win every session — blackjack still involves variance. But it means you're always making the mathematically best decision available to you.
Why Basic Strategy Matters
Without a strategy, many players rely on gut feelings or common myths (like always assuming the dealer's hole card is a 10). These approaches typically push the house edge to 2–4% or higher. Basic strategy closes that gap dramatically, making blackjack one of the lowest house-edge games in any casino when played correctly.
Core Basic Strategy Rules
The full strategy chart has many combinations, but these core rules cover the most common situations:
Hard Hands (No Ace, or Ace Counted as 1)
- Hard 8 or less: Always hit.
- Hard 9: Double against dealer 3–6; otherwise hit.
- Hard 10: Double against dealer 2–9; hit against 10 or Ace.
- Hard 11: Double against dealer 2–10; hit against dealer Ace.
- Hard 12: Stand against dealer 4–6; hit otherwise.
- Hard 13–16: Stand against dealer 2–6; hit against 7 and above.
- Hard 17+: Always stand.
Soft Hands (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 dealer 2–6; stand against 7–8; hit against 9, 10, Ace.
- Soft 19–21: Always stand.
Pairs (Splitting)
- Always split: Aces and 8s.
- Never split: 5s and 10s.
- Split 9s against dealer 2–6, 8–9; stand against 7, 10, Ace.
- Split 7s against dealer 2–7; hit otherwise.
- Split 2s and 3s against dealer 2–7; hit otherwise.
How Table Rules Affect Strategy
Basic strategy isn't identical at every table — rule variations change the optimal play. Key rules to look for:
| Rule | Effect on House Edge |
|---|---|
| Dealer stands on soft 17 | Better for player (lower house edge) |
| Blackjack pays 3:2 | Standard — avoid 6:5 tables |
| Double after split allowed | Lowers house edge slightly |
| Late surrender available | Player-friendly rule |
| More decks in the shoe | Slightly increases house edge |
Practical Tips for Using Basic Strategy
- Use a strategy card. Most casinos allow you to reference one at the table. Online, you can keep it open in another window.
- Learn the patterns, not just the rules. Understanding why you double on 11 helps you remember and apply the strategy under pressure.
- Avoid insurance bets. Insurance has a house edge of around 7% and is not recommended under basic strategy.
- Choose the right table. Seek games with favorable rules — S17, 3:2 payouts, and liberal doubling and splitting options.
The Bottom Line
Basic strategy won't guarantee wins, but it ensures you're never making a mathematically poor decision. Master it, and you'll be playing one of the best-odds games in the casino at close to even money against the house.