Doubling on a blackjack and getting a guaranteed ten value

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Quote: Ibeatyouraces

Suppose you are at a casino playing blackjack wherein they don't pay you on a bj until its your turn. This place also allows doubling on a blackjack. In another thread, BedWetterBetter brought up a situation where he doubled A,8 vs 4 when a 2 was exposed to give him a for certain 21. Not only did he have 21, he gets more chips on the felt with absolutely no risk. The question at hand here is would it be advisable to do this on a blackjack knowing you are getting a ten value for sure? The only difference here is there is slight risk of not taking a sure 150% and now possibly getting a push but you can't lose.

If you want to make more money, sure.

Like we always say, you don't know the dealer has a 10 in the hole every time.

He could easily be drawing on a 10 or 11 himself, which would hurt any other players who have less than 21. So you may prevent a table loss, while at the same time getting more money for yourself.

At worst, you make nothing, but lose nothing and every one else loses the hand.

But it's no different than you doubling a 10 or 11, getting the picture and then the dealer turns up 12-16 and also catches a lucky 21! Sheeit just happens!!

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Basically you are betting your guaranteed $150 payout for a possible $200 (win) or possible $0 (push). That means you must win your hand with p>75% to be valuable. Looking at the Blackjack Appendix 2a, the probability of a dealers 21 is below 12% for any upcard.

So yes, if you (somehow) know there is a ten coming for sure, you should always double your blackjack hand.

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Quote: Ibeatyouraces

Thats what I thought but always like confirmation.

Now that is settled, will you please explain to me and the rest of the group how to be 100% sure the next card is a 10? Please and thank you! ;)

Quote: Ibeatyouraces

Suppose you are at a casino playing blackjack wherein they don't pay you on a bj until its your turn. This place also allows doubling on a blackjack. In another thread, BedWetterBetter brought up a situation where he doubled A,8 vs 4 when a 2 was exposed to give him a for certain 21. Not only did he have 21, he gets more chips on the felt with absolutely no risk. The question at hand here is would it be advisable to do this on a blackjack knowing you are getting a ten value for sure? The only difference here is there is slight risk of not taking a sure 150% and now possibly getting a push but you can't lose.

Sure. If you KNOW that a ten is coming up and you have a BJ why not DD?

Note: There is a TC (I believe is +9 or something similar) in which you would DD on a BJ vs a dealer's 6.

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Quote: Ibeatyouraces

Accidentily exposed and a supervisor calls it as next card instead of burning it. Very rare buy does happen.

I thought you were going to sell me magic beans or x-ray glasses. Damn.

Quote: BigJer

Note: There is a TC (I believe is +9 or something similar) in which you would DD on a BJ vs a dealer's 6.

I think that's for a "Soft 21" (if you split tens and get an ace with DAS, or if you're playing at one of those rare casinos that let you double after splitting aces and you get a ten) and not a natural blackjack.