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Bayesian Blackjack

The dealer's shoe is secretly short of tens, standard, or rich in tens. Work out which from the cards, and bet accordingly.
How to play
  1. Pick a bet and press Deal. Get closer to 21 than the dealer without going over. Number cards count their value, J, Q and K count 10, and an ace counts 1 or 11.
  2. Hit takes another card, Stand stops, and Double doubles your bet for exactly one more card (only on your first two cards).
  3. The dealer then draws until reaching 17 or more. Beat the dealer's total, or win when the dealer goes over 21. A two-card 21, a blackjack, pays 3 to 2.
  4. With Odds on, each button shows its expected value and the best play has a gold outline. Use the shoe panel to judge whether the shoe is short of tens or rich in them, and bet more when your edge is positive.
  5. A game is 20 hands, starting with 1,000 chips.

Playing with a class? Tap Join a class room and enter the code you were given, and your games go on the class leaderboard.

Place a bet
The table
Dealer
You
The dealer's face-down card
rank of the hidden card
Best play for every hand, with this shoe
Worked out from the cards you've seen. A dot marks a play this shoe changes from standard basic strategy; your hand is outlined.
HitStandDouble