Blackjack Strategy FAQ
Short, direct answers to the questions players ask most about basic strategy, house edge, and how Blackjack Decision Lab calculates its recommendations. For the full reasoning behind any answer, use the trainer.
What is blackjack basic strategy?
Blackjack basic strategy is the mathematically preferred action — Hit, Stand, Double, Split, or Surrender — for every combination of player hand and dealer upcard, derived by comparing the long-run expected value of each legal action under a given set of table rules.
Does basic strategy guarantee a win?
No. Basic strategy minimizes the casino's long-run mathematical edge, but it does not eliminate it and does not guarantee that any individual hand or session will win. A correct decision can still lose, and an incorrect decision can still win — see Basic Strategy for the full explanation of decision quality vs. outcome.
When should I hit or stand in blackjack?
The correct choice depends on your total and the dealer's upcard. As a general pattern, stand on hard 17 or higher, and on hard 13-16 against a dealer 2-6; hit hard totals against a dealer 7 or higher. Soft hands and pairs follow different rules. See the full basic strategy chart for every situation.
When should I double down in blackjack?
Doubling is generally correct when your two-card total gives you a strong chance of a high final total against a weak dealer upcard — most commonly hard 9-11 against a dealer 2-9, and several soft totals against a dealer 4-6.
Why should you split Aces and 8s?
A pair of Aces is split because keeping them together caps the hand at a hard or soft 12, while splitting gives two chances at a strong total built around an Ace. A pair of 8s is split because playing them as a hard 16 — the worst total in blackjack — is worse than playing two separate hands starting from 8.
Why shouldn't you split 10s?
A pair of 10-value cards is already a hard 20, one of the strongest totals in the game. Splitting trades a near-guaranteed strong hand for two new hands starting at 10, which lowers expected value even though it feels tempting.
What is a soft 17?
A soft 17 is a hand containing an Ace counted as 11, such as Ace-6, giving a total of 17 that cannot bust on the next card. Whether the dealer hits or stands on soft 17 changes the house edge and several basic strategy decisions — see S17 vs. H17.
What does house edge mean?
House edge is the casino's long-run mathematical advantage, expressed as a percentage of each bet the player is expected to lose over many hands. Basic strategy reduces this edge to its lowest possible level under the given rules, but it does not remove it.
Why does the casino have an advantage in blackjack?
The dealer's core structural advantage is that the player acts first: if the player busts, the player loses immediately even if the dealer would have busted too. Rule details like blackjack payout, number of decks, and dealer soft-17 behavior adjust the size of that edge.
Does the number of decks matter in blackjack?
Yes. More decks slightly increase the house edge and can shift a small number of basic strategy decisions, mainly around doubling and surrendering, because they change the composition of remaining cards.
Is a 3:2 blackjack payout better than 6:5?
Yes, significantly. A 3:2 payout pays $3 for every $2 wagered on a natural blackjack; a 6:5 payout pays less for the same hand. Switching from 3:2 to 6:5 substantially increases the house edge and is one of the most impactful single rule changes at a table.
What does H17 mean in blackjack?
H17 means the dealer must hit on a soft 17 rather than stand. This gives the dealer an additional opportunity to improve certain hands, which slightly increases the house edge compared to a table where the dealer stands on soft 17.
What does S17 mean in blackjack?
S17 means the dealer stands on all 17s, including a soft 17 such as Ace-6. This is generally more favorable to the player than a table where the dealer hits soft 17.
Does card counting change basic strategy?
Basic strategy itself assumes no knowledge of remaining cards and stays fixed for a given rule set. Card counting is a separate technique that tracks the ratio of high to low cards remaining and adjusts bet sizing and some playing decisions accordingly. Blackjack Decision Lab teaches basic strategy, not card counting.
Can blackjack strategy eliminate the house edge?
No. Even played perfectly, basic strategy leaves the casino with a small mathematical edge under standard rules — typically well under 1% with favorable rules, higher with unfavorable ones. It minimizes unnecessary losses; it does not turn the game in the player's favor.
What is the difference between Decision Quality and Actual Outcome?
Decision Quality measures whether the action taken matched basic strategy at the moment it was made, before the next card was known. Actual Outcome is simply whether that hand was won, lost, or pushed. Blackjack Decision Lab tracks these separately because a correct decision can still lose, and an incorrect decision can still win — see How It Works.
Want to see these answers applied to a live hand instead of a static chart? Start Training.