double again blackjack

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bernmasd

Member
#1
#1
a few casinos i go have the option of doubling again.
for example you have 6-3
dealer shows 6
you bet 100 $
you double put 100 more.
there comes 2 (or any card) if you want, you may put 100 more and double again but this one is final no more double anymore. your total bet becomes 300 if you win get 600 if you stand you get 300 if you lose you have fun. so it is a big advantage.
Can anybody calculate how much this doubling again offers the player.
also when should we double again and should we change basic strategy to double 8 against 6-4 for example.
thanks.
 
moo321

moo321

Well-Known Member
#2
#2
I'm guessing around .3-.4%. Quite good for a counter. Also, it should change your basic strategy, especially vs. bust cards.
 
P

pit15

Well-Known Member
#3
#3
You sure this isn't redoubling for SPANISH 21?

Because this would be a pretty big edge.

You would be doubling hard 6/7/8 versus 5/6 (maybe even more), and be doubling more hands versus 2/3/4 upcards
 
B

bernmasd

Member
#5
#5
double againno

this is not spanish or some other games
this is 6 deck blackjack 3.5 deck pen approximately
double after split permitted
dealer stays at s17
no hole card you lose all doubles and splits against dealer blackjack
no resplitting of aces
early surrender vs 10 only
split up to 4 times
the only difference between normal blackjack and this one is that you may double again after doubling,
so for exampole, if you have 9 and doubled, you get 2, you add 1 unit more, you have 3 units bet and you draw again.
i want to find best strategy.
i normally play as if normal basic strategy and double 9-2 more and
double ace -2 against 3-4
but there should be a better one involving doubling 8 against 4-6 or something like that, i can calculate it but it takes too much time.
also one last question should i play at this kind of place
or at a casino who does not permit doubling again but permits splitting aces again (only one card) and permits early surrender against ace
 
Last edited:
P

pit15

Well-Known Member
#7
#7
At the minimum you need to double down on 6,7,8 vs 3 - 6 up

Here's the reasoning behind that:

Soft 17/18 and 9, 10, 11 are DD hands versus 3 - 6, a double down on 6 - 8 will either result in one of these hands, or a hand you normally do not take an additional hit on (the exceptions being getting a hard 12 versus 3 up, and getting a hard 8 when DDing on 6, which you would redouble on). I would say it's +EV to make the initial double down on even more then that, look at the redouble startegy charts on spanish 21.. it'll give you a good idea on how to play.

Can you redouble for less? Because that would increase what you can double down on versus stronger dealer upcards if you can buy another card for a dollar after doubling.

It's possible this game has a player edge off the top with optimal strategy.
 
Southpaw

Southpaw

Well-Known Member
#10
#10
bernmasd,

I did some preliminary simulations on this game. For now, I only used basic strategy. I performed a simulation against the rules that you specified minus the redoubling rule and then I added the redoubling rule. As you'll see this is a pretty nice game, for the house edge when using a standardized basic strategy is practically zero. Unfortunately, however, the poor penetration limits the advantage that one could possibly have in this game. The parameters, just as you specified, are as follows:

6D, 2.5 decks cut off, 3:2 BJ, ENHC Dealer BJ wins all, DOA2, DAS, ES v. 10, SP to 4, No RSPA, Head-On (and then I added redouble for the second simulation).

Here are the results:

No Redoubling: -.327% (SCORE = -10.58)
Redoubling: -.084% (SCORE = -.69)

A few notes about the BS I was using. I am not quite sure what the correct BS is for ES v. 10. For now, I had the simulation surrendering 15 and 16 (not 8,8) v. 10. Perhaps, however, it would be appropriate to surrender 7,7, 8,8 and maybe even hard 14 against the 10 as well when ES v. 10 is allowed.

I do have an index generator, but unfortunately redoubling is not a parameter that I can specify. However, should you wish to recommend a strategy (with indices or not) to try against the redoubling game, I'd be happy to run it for you to see how the recommended strategy would perform. Clearly, the optimal strategy for this game will double and split more often than the typical basic strategy tables indicate.

Best,

SP
 
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