Single Deck Indices Question?

SammyBoy

Well-Known Member
I'm a little confused about the index number for 9 VS 2 (single deck). The index number is +1, does this mean that if the true count is +1 or less you don't double? Basic strategy for single deck 9 VS 2 is to double. Thanks in advance.
 

Abraham de Moivre

Well-Known Member
9 vs 2 If the count is +1 or more, you DO double. Less than +1, don't double.
Throw this extra one into your brain since you will never forget the above.
9 vs 3 If the count is -1 or more, you DO double. Less than -1, don't double.

This isn't only single deck. Play multiple decks the same way.
 

T-Hopper

Well-Known Member
Risk-aversoin

I don't know which count you are using, but you might want to add a point to one or both of these index numbers. Would you really want to double if the edge was only 0.2% or less?
 

The Mayor

Well-Known Member
Re: Risk-aversoin

With 9 vs. 2 and a TC of +1, you would be doubling a relatively small bet anyway, so yes, you would risk the extra small bet with a small advantage.

My understanding is that risk adverse usually applies to those situations with a max bet out, where the strategy deviation gives a minimum advantage, then there is something to be said.

For example, you have a 1.00% edge with a $100 bet out. Would you want to put out $200 to get a 1.02% edge? That is, would you risk that extra $100 on a .02% gamble?

Another way to look at this is that the SD greatly increases, but the EV only increases a little. We are hoping to maximize EV/SD with our RA indices.

--Mayor
 

wongway21

Member
Re: Risk-aversion

Are there any good resources that discuss risk-aversion strategies as they relate to each increment of a betting spread? I've wondered what the effects of changing a spread from say 1-8 where you step up in small increments (ie 1,2,4,6,8) vs stepping up more rapidly and to slightly higher increments (ie 1,4,8,12). This is because of the mayors point, that for smaller betting values the risk may be justified since it is a smaller fraction of your bankroll. A larger number of hands are also played at the smaller count values, so I'd also like to know how this affects the outcome.

Also, is there any increased risk of being suspected of counting by stepping up in larger increments? Or is the main thing to worry about the total spread?

WW21
 

T-Hopper

Well-Known Member
Re: Risk-aversoin

With 9 vs. 2 and a TC of +1, you would be doubling a relatively small bet anyway, so yes, you would risk the extra small bet with a small advantage.

I have three points to make here.
<OL>
<LI>Even a one unit bet is still money at risk. And doubling down quadruples the variance.
<LI>Your average bet will be greater than one unit when the TC is +1. Sometimes, you would have made a larger bet and then seen some big cards elsewhere on the table.
<LI>For a very small edge (say 0.2% or less) why would you even want to double down? What if your TC conversion is off by a few cards. You're essentially betting on a coin toss.

My understanding is that risk adverse usually applies to those situations with a max bet out, where the strategy deviation gives a minimum advantage, then there is something to be said.

This is when the risk-averse index could be 2,3 or more points higher than the risk-neutral number. It's worth being risk-averse on ALL marginal plays.
 

hammer

Well-Known Member
Re: Risk-aversoin

The advantage is greater if surrender is allowed. Iused to
hate the rule and now love it,if not allowed do not play and
play other games-dbl/6 deck.
 

Jim Masters

New Member
doubling 9 against a 3

With 9 against a 3 and a TC of -1 you so NOT double.
I hate this play on close dicisions anyway because
of the 2. IMHO
 

learning to count

Well-Known Member
Re: doubling 9 against a 3

"With 9 against a 3 and a TC of -1 you so NOT double.
I hate this play on close decisions anyway because
of the 2. IMHO"

The suggested deviation indicise's for nine against 2,3,and seven I believe are 9: 2/1,3/0,4-6,7/3. HI-Lo. So at dealer up card of 2 with a tc of +1 you would double, and yes dealer up card of 3 with a tc of 0 or more you would double, and at a dealer up cards 4 through 6 you would auto double. If the dealer has a up card of 7 and you have a +3 TC you would double.

So yes if you have a dealer up card of 3 and a TC of minus 1 or less you would hit yes! IMHO
 

zengrifter

Banned
Re: doubling 9 against a 3

Whether you double 9v3 @ +1,0,-1 makes NO difference to your Ev - this is where you have license to round the # to 0 AND excercize INTUITION. Rounding the 9v2 to +2 provides for an RA-improved base, as well. zg
 
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