Blackjack Basic Strategy: The Complete Guide to Perfect Play

Before you learn to count cards, you must master basic strategy. This mathematically optimal approach reduces the house edge to around 0.5%—the foundation of all advantage play.

What is Basic Strategy?

Basic strategy is the mathematically correct play for every possible hand combination in blackjack. It was developed using computer simulations of millions of hands to determine the statistically best decision.

Why Basic Strategy Matters

The difference between "gut" play and basic strategy is enormous over time.

Hard Hands (No Ace, or Ace counted as 1)

When to Hit

• Hard 8 or less: Always hit
• Hard 12: Hit against dealer 2-3 (stand against 4-6)
• Hard 13-16: Hit against dealer 7 or higher

When to Stand

• Hard 17+: Always stand
• Hard 12: Stand against dealer 4-6
• Hard 13-16: Stand against dealer 2-6

When to Double

• Hard 11: Double against everything except Ace
• Hard 10: Double against dealer 2-9
• Hard 9: Double against dealer 3-6

Soft Hands (Ace counted as 11)

Soft 17 (A-6)

• Double against dealer 3-6
• Otherwise hit

Soft 18 (A-7)

• Stand against dealer 2, 7, 8
• Double against dealer 3-6
• Hit against dealer 9, 10, Ace

Soft 19-21

• Always stand

Soft 13-16 (A-2 through A-5)

• Double against dealer 5-6
• Otherwise hit

Pair Splitting

Always Split

• Aces: Always split
• 8s: Always split (even against 10 or Ace)

Never Split

• 10s: Never split (you have 20!)
• 5s: Never split (double if possible, otherwise hit)

Conditional Splits

• 2s, 3s: Split against dealer 2-7
• 4s: Split only against dealer 5-6
• 6s: Split against dealer 2-6
• 7s: Split against dealer 2-7
• 9s: Split against 2-6 and 8-9 (stand against 7, 10, Ace)

Surrender Strategy

If surrender is available:

• Surrender hard 16 vs. dealer 9, 10, Ace
• Surrender hard 15 vs. dealer 10
• With card counting: Surrender 15 vs. Ace at high counts

Insurance

Never take insurance playing basic strategy. It's a side bet with negative expected value.

Exception: With card counting, take insurance when true count is +3 or higher.

Rule Variations

Basic strategy adjusts based on table rules:

Dealer Hits Soft 17 (H17)

• More aggressive with doubling
• Surrender more often

Double After Split Allowed (DAS)

• Split pairs more liberally

6 Deck vs. Single Deck

• Single deck: More doubling opportunities
• 6 deck: Slightly more conservative

Quick Reference Summary

The "Always" Rules

• Always split Aces and 8s
• Always stand on hard 17+
• Always hit hard 8 or less
• Never split 10s or 5s
• Never take insurance (without counting)

The Key Decision Points

• Hard 12 vs. 2-3: Hit (many players wrongly stand)
• Soft 18 vs. 9-A: Hit (standing loses more)
• 11 vs. Ace: Double (in most games)
• Pair of 9s vs. 7: Stand (you beat their likely 17)

Common Mistakes to Avoid

1. Standing on 12 vs. 2 or 3

You should hit. The dealer isn't that likely to bust.

2. Not Doubling Soft Hands

Soft 17 and 18 against dealer 5-6 are profitable doubles.

3. Splitting 10s

Never break up a 20, even against a 6.

4. Taking Insurance

It's a sucker bet at basic strategy level.

5. Playing Hunches

"I feel like a 10 is coming" isn't math. Stick to the chart.

Practice Makes Perfect

Learning basic strategy takes time. Here's how to master it:

• Start with hard hands - They're most common
• Memorize in groups - All 12s, all 13s, etc.
• Use flashcards - Test yourself regularly
• Practice with our tool - Get real-time feedback

From Basic Strategy to Card Counting

Once basic strategy is automatic, you're ready for:

• Learning to count cards
• Making index plays (strategy deviations)
• Bet spreading based on count

Our card counter tool shows optimal plays and tells you when to deviate based on the count.

The Bottom Line

Basic strategy is non-negotiable for serious blackjack players. It:

• Reduces house edge to ~0.5%
• Forms the foundation for card counting
• Is completely legal to use
• Works at every casino

Every dollar lost to bad decisions is a dollar you didn't have to lose.

Practice perfect strategy with our free tool →