What Is Basic Blackjack Strategy?
Basic strategy is a mathematically derived set of decisions that tells you the optimal action for every possible blackjack hand against every possible dealer upcard. It was developed through computer simulations running millions of hands to determine which choice — hit, stand, double, split, or surrender — produces the best statistical outcome over time.
Following basic strategy does not guarantee you'll win every hand, but it minimises the house edge to its lowest possible level, typically under 1% in standard blackjack variants.
The Core Decisions in Blackjack
- Hit: Take another card from the dealer.
- Stand: Keep your current hand and end your turn.
- Double Down: Double your bet in exchange for exactly one more card.
- Split: If you have two cards of the same value, split them into two separate hands.
- Surrender: Forfeit half your bet and end the hand (available in some variants).
Key Basic Strategy Rules to Know
Hard Hands (No Ace, or Ace Counting as 1)
- Hard 8 or less: Always hit.
- Hard 9: Double if dealer shows 3–6, otherwise hit.
- Hard 10–11: Double in most situations unless dealer has a strong upcard (10 or Ace).
- Hard 12–16: Stand when dealer shows 2–6; hit when dealer shows 7 or higher.
- Hard 17+: Always stand.
Soft Hands (Ace Counting as 11)
- Soft 13–15: Hit (or double if rules allow and dealer shows 4–6).
- Soft 16–18: Double against dealer's weak upcards; otherwise hit or stand.
- Soft 19+: Always stand.
Pairs
- Always split: Aces and 8s.
- Never split: 10s and 5s.
- Context-dependent: 2s, 3s, 6s, 7s, and 9s depend on the dealer's upcard.
Why Does the Dealer's Upcard Matter?
The dealer's visible card is your most important piece of information. When the dealer shows a low card (2–6), they have a higher chance of busting because the rules require them to hit until they reach 17. This is why basic strategy often tells you to stand on weaker hands when the dealer is showing a "bust card."
When the dealer shows a strong card (7–Ace), you need to act more aggressively because they are less likely to bust.
House Edge: Basic Strategy vs. Guesswork
| Playing Style | Approximate House Edge |
|---|---|
| Basic Strategy | 0.5% – 1% |
| Intuitive Play | 2% – 4% |
| Poor Play | 4%+ |
How to Use a Strategy Chart
A basic strategy chart lays out every possible player hand against every dealer upcard in a grid format. Many online casinos allow you to reference a chart while playing. Practising with a chart during free-play mode is an excellent way to internalise the decisions before playing for real.
Important Reminders
- Basic strategy is calculated for specific rule sets — always check if the game uses S17 (stand on soft 17) or H17 (hit on soft 17) as this affects some decisions.
- Basic strategy does not count cards — it is entirely based on your hand and the dealer's upcard.
- No strategy eliminates the house edge completely. Set a budget and play within your means.