Double Down

What's the book play?

Hard 16 vs Dealer 10

Your rating

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Peak —

Your record

Current streak—

Best streak—

Solved—

Accuracy—

Focus

Switching focus deals a fresh puzzle.

How it works

Each puzzle is one cell of the basic-strategy chart. Pick the book play — press H, S, D, or P. Right answers climb your rating; the trainer leans on the spots you miss.

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