I do not want to know what the probability of the dealer busting is. So I am dealt two If you have 20 then you will bust on anything but an Ace. Learn what the probability that a dealer may have blackjack, wins or busts here. Includes soft 17 probabilities. How often will a Blackjack dealer bust based on their up card? When the dealer is showing a 5 or a 6 they have a 42 percent chance of. Please fc porto spieler a valid email address. The dealer will bust more often with certain up cards than with. Sign up using Facebook. Probabilities in the first four cards Join Stack Overflow in Standing Up for Net Neutrality. Many novice players will double down with a hand of 7 or 8 against a dealer showing an up card of 5 or 6.