What Is Blackjack Basic Strategy?
Basic strategy is a set of mathematically proven decisions that tell you the optimal play for every possible hand combination in blackjack — based on your cards and the dealer's visible upcard. It was developed through computer simulations running millions of hands to determine which action (hit, stand, double down, split, or surrender) minimises the house edge in any given situation.
Following basic strategy consistently can reduce the house edge to as low as 0.5% in favourable rule sets — making blackjack one of the best-value games in any casino.
Core Actions Explained
- Hit: Request another card from the dealer.
- Stand: Keep your current hand and end your turn.
- Double Down: Double your initial bet and receive exactly one more card.
- Split: When dealt a pair, divide them into two separate hands, each with a new bet equal to the original.
- Surrender: Forfeit half your bet to avoid playing out a hand with poor odds (not available in all versions).
Key Basic Strategy Rules
Hard Hands (No Ace, or Ace Counted as 1)
- Always stand on hard 17 or higher.
- Always hit on hard 8 or lower.
- Double down on hard 11 in most situations.
- Double down on hard 10 unless the dealer shows a 10 or Ace.
- Double down on hard 9 when the dealer shows 3–6.
- Stand on hard 12–16 when the dealer shows 4–6 (bust cards); hit otherwise.
Soft Hands (Ace Counted as 11)
- Always stand on soft 19 (A-8) or higher.
- Double on soft 18 (A-7) when dealer shows 2–6.
- Always hit soft 13–17 when the dealer shows 7 or higher.
Pairs
- Always split Aces and 8s.
- Never split 10s or 5s.
- Always split 9s unless the dealer shows 7, 10, or Ace.
- Split 7s against dealer 2–7.
- Split 6s against dealer 2–6.
Why Does Basic Strategy Work?
Blackjack is unique among casino games because your decisions genuinely affect the outcome. Unlike roulette or slots, where each spin is independent and no strategy changes the odds, blackjack involves choosing from a finite deck, and optimal decisions can be calculated statistically.
Basic strategy doesn't guarantee wins — the house still retains a small edge — but it ensures you're never making a decision that costs you more than necessary over the long run.
Rule Variations That Affect Strategy
| Rule | Effect on House Edge |
|---|---|
| Dealer stands on soft 17 | Reduces house edge |
| Blackjack pays 6:5 (instead of 3:2) | Significantly increases house edge |
| Double after split allowed | Reduces house edge |
| Late surrender available | Reduces house edge |
| More decks in play | Slightly increases house edge |
Using a Strategy Card
Most casinos allow players to use printed basic strategy cards at the table — it's not cheating. You can also memorise the strategy over time. Many free online tools let you practice making basic strategy decisions until they become second nature.
The Bottom Line
Basic strategy is the essential starting point for any serious blackjack player. It takes time to learn, but the effort pays off by giving you the best mathematical chance at the table. Before exploring advanced techniques like card counting, make sure basic strategy is second nature.