Double down twice

[Jollybob]

I found a casino where you can double down again after getting 3rd card. For example you bet $100 get 9 vs 6 , double down for $100 and get a 2. Now you have the option to double down for another $100.

Are anyone familiar with this rule? If so how much is it worth and how much do you deviate from basic strategy. For example 7 vs 6 gotta be a hand you double down with I assume.

So before I start crunch the numbers hopefully someone have the answer, saving me some time

[Ole]

There is a Double-Double-Down variation of the game Spanish 21/Australian Pontoon that I play. Very profitable. I know it's in Washington state and a few other places i've found.
Katarina Walker wrote great index deviations for it in her book. I used then to modify numbers for a game called Single 21 in Tunica.
You can start by seeing how Kat did it.

Sent from my SM-G900T using Tapatalk

[aceside]

Now you have the option to double down for another $100.

Are you sure this is correct? In Spanish 21 double-double-down rule, you are supposed to double down a second time for another $200, and the edge gain is about 0.4%.

[Norm]

Both versions exist; although the version where you just end up tripling is uncommon. Last I heard, the version in WA allows two redoubles; but with a cap.

[Jollybob]

Not sure, it may be for $200. This is regular Black Jack though.

[Gramazeka]

Its redouble or triple rules. 1+1+1. EV + 0.46

[Freightman]

Both versions exist; although the version where you just end up tripling is uncommon. Last I heard, the version in WA allows two redoubles; but with a cap.

That is correct. The Washington State version is H17. Assuming Gramazskas quoted edge is correct, that presumes that the second or 3rd double does not take you over table max.

example $200 max bet
$60 bet
x =$60
xx=$120
xxx=$240, capped by table max

[Gramazeka]

xxx=$240

=180

[Freightman]

=180

Double $60
Double Double $120
Double Double DOUBLE $240

Each step is doubled, not double the OBO for the final double

[Gramazeka]

For 1+1+2 EV = +0.63

[Freightman]

For 1+1+2 EV = +0.63

Actually thought it was a bit more. Regardless, very popular in Washington State. Quality of play is abysmal.

Used to quite like the game. No longer in my domicile. Pretty rusty.

[jjjggg]

There is a Double-Double-Down variation of the game Spanish 21/Australian Pontoon that I play. Very profitable. I know it's in Washington state and a few other places i've found.
Katarina Walker wrote great index deviations for it in her book. I used then to modify numbers for a game called Single 21 in Tunica.
You can start by seeing how Kat did it.

Sent from my SM-G900T using Tapatalk

Is anyone willing to share index deviations for Spanish 21 using the "Secret Monkey" count?

I'd be very grateful.

Sent from my SM-G986U1 using Tapatalk

[DSchles]

Quoting these edges doesn't provide much real info as to the increase in SCORE, unless you're simply a flat-betting BS player. Rules like this one can increase SCORE on a percentage basis much more than simply adding the increase in BS EV.

Also you don't mention if DAS is allowed. That raises the BS edge from 0.4% to 0.6%.

As for BS changes, see Wong's Basic Blackjack, pp. 58-59. And no, you don't double 7! In all, with DAS, there are 14 changes; 11 if NDAS.

Don