I thought about what Meistro123 said. The double for A9 would act the exact same even with your rules, so the index should be the same as normal.
the indices may be high enough with too much heat your author didn't consider them. I use HiOpt2 and the index I use to double A9 v 6 is +9 and v 5 is +10. The correct pivot point is slightly sooner in some games though. In hi-lo the same indices would be closer to +5.
I would approach this double the same as I would 8v6. Even though not risk averse for me, I would treat it as such, and double only on higher counts. Like 8v6 where index fir double us +1, it's to easy a move for the eye or pit to pick off. Further, long term gain at +1 is minimal. At higher counts, if you're so inclined, the percentage of total expected value is lucrative enough to make the double worthwhile. FWIW.
It's higher than that. I'm not sure if I should post the listed index number here for the game's security, but it's higher than +1 for SP21/Pontoon when using a level 2 count (modified SMC in this case).
Like Zen said, it makes sense that the index should be a little lower when doubling A9, and the split 10,10 index is about right, if not a blip higher than the standard split 10s index (which requires a MONUMENTAL count in SP21/Pontoon btw).
Nope. A8 v 5/6 double is the best double, of all non-BS double. You only need TC +1 to do that. 8 v 6, you need TC +2. 8 v 5, you need TC +3. (Assuming TC is calculated by the number of half-decks. So for 6D, initially you divide RC by 12. I do so to make level 1 and level 2 counting systems to have similar and comparable indexes.)
Not correct, as you go by the composition of the hand rather than the actual value. In Pontoon, 9 v 5 double, as in a 9 total NOT consisting of an ace, is +1. That is for a level 2 balanced count such as SMC. 8 v 6 I'm not sure about, but the 9 v 4 double is +4 which would probably make a 8 v 5/6 index very high I'd assume. And besides, you can't double on 8 with the rules I listed anyway and there's no indices listed for it either.
Edit: actually, I played it tonight and you can double on any hand. Hmm..
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