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Double Down

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In blackjack, doubling your initial bet in exchange for receiving exactly one more card.

Key Takeaways

  • 1Double down means doubling your bet for one more card
  • 2Most valuable on 11 against dealer 2-10
  • 3It's how you maximize profit in favorable spots
  • 4Follow basic strategy charts for optimal doubling decisions

What is Doubling Down?

Doubling down in blackjack means doubling your original bet after seeing your first two cards, in exchange for receiving exactly one additional card. It's one of the most powerful moves in the game when used correctly.

When to Double Down (Basic Strategy)

Your HandDealer ShowsAction
112-10Always double
102-9Double
93-6Double
Soft 16-184-6Double

Why It Matters

Doubling down is how you maximize profit in favorable situations. When you have 11 and the dealer shows a 6, you're in a strong position — doubling lets you get more money on the table when the math is in your favor.

Common Mistakes

  • Not doubling when you should — costs you money long-term
  • Doubling on 12+ — too risky, likely to bust
  • Ignoring the dealer's upcard — the dealer's card matters as much as yours

Powered by the MIT Triple Stack

Expected Value + Kelly Criterion + Monte Carlo — the same math from MIT and Bell Labs.