Blackjack 10 vs Dealer 9
Basic strategy: Double down — or hit if you have already taken a card and can no longer double.
For 6-deck blackjack where the dealer stands on soft 17 (S17), with double-after-split and late surrender — the Vegas Strip S17 rules.
10 versus a vulnerable dealer 9 is a premium doubling spot: you are a favorite to draw into a strong total while the dealer is at real risk of busting. Double down to get more money in while the odds favor you — you take exactly one more card.
Exact EV for this hand
The board below is loaded with 10 against a dealer 9. Fullcount computes the precise expected value of every action from the live shoe — change the rules or add cards to see how the best play shifts.
More on this decision: read When to double down, browse the full basic-strategy matrix, or start from the basic strategy overview. Playing a different game? Compare rule variants.
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