Blackjack Basic Strategy

Complete Blackjack Basic Strategy Guide

What is Basic Strategy?

Basic strategy is the mathematically optimal way to play every possible hand in blackjack. Developed through computer simulations of millions of hands, it represents the statistically best decision for every combination of player hand and dealer upcard. When followed correctly, basic strategy reduces the house edge to its minimum possible level.

One caveat worth knowing before you memorise anything: a basic strategy chart is computed for a specific rule set. Change the number of decks, whether the dealer hits soft 17, or whether they take a hole card, and a handful of decisions change with it. See how the main blackjack variants differ — including European no-hole-card rules, which alter several familiar plays.

The strategy is based on probability theory and expected value calculations. Each decision (hit, stand, double, split) is determined by comparing the mathematical expectation of all possible actions and choosing the one with the highest expected return.

The Mathematics Behind Basic Strategy

Expected Value Calculations

Every basic strategy decision is based on expected value (EV) - the average amount you can expect to win or lose on a particular play over the long run. The computer calculates the EV for each possible action and recommends the one with the highest value.

Probability Distributions

Basic strategy considers the probability of each possible outcome. For instance, when the dealer shows a 6, they have approximately a 42% chance of busting, making it advantageous for players to stand on lower totals and let the dealer bust.

Action Abbreviations & Meanings

H Hit

Take another card from the dealer. Use when your hand total is low and the risk of busting is minimal.

S Stand

Keep your current hand total. Use when your hand is strong enough or when the dealer is likely to bust.

D Double Down

Double your original bet and receive exactly one more card. Use when you have a strong advantage. If the casino rules don't allow doubling on that hand, hit.

P Split

Separate a pair into two hands, each with its own bet. Use when splitting gives better EV than playing as one hand.

Rh Surrender

Forfeit half your bet and end the hand immediately. Use in very unfavorable situations where continuing has worse EV. If surrender isn't offered, hit (Rh) or split (Rp).

Ds Double or Stand

Double down if the casino rules allow it, otherwise stand. Common when doubling is optimal but not permitted.

Benefits of Using Basic Strategy

Rule Variations & Adjustments

Basic strategy can vary slightly depending on specific casino rules. Here are the most important rule variations that affect optimal play:

Learning & Memorization Tips

Put it into practice with the basic strategy trainer, look up a single hand in the basic strategy calculator, or keep the printable strategy chart next to you.

Hard Hands Strategy

Hard hands are hands without an Ace, or hands where the Ace counts as 1. Click on any cell to see the reasoning behind the decision.

• H Take another card
• S Keep your current hand
• D Double if allowed, otherwise Hit
• Ds Double if allowed, otherwise Stand
• P Separate pairs into two hands
• Rh Surrender if allowed, otherwise Hit
• Rp Surrender if allowed, otherwise Split

Charts for 6 decks, dealer hits soft 17, double on any two cards, double after split allowed, late surrender — the American blackjack rules used at the 21Count table.

Soft Hands Strategy

Soft hands contain an Ace that can be counted as 11 without busting. These hands offer more flexibility in your playing decisions.

Pairs Strategy

When you're dealt a pair, you have the option to split them into two separate hands. Use this chart to determine when splitting is the optimal play.