Here is the answer to your questions.
See the attached PDF.
For standing A7 v A
CC = Correlation Coefficient, AACpTCp = Average Advantage Change per True count point, Idx = infinite deck Index
Count.................. CC........AACpTCp......Idx
HL.......................50%.........0.5%........1 .4
3m6c...................70%.........1.7%........0.5
HL + 3*(3m6c)......85%.........0.5%.......1.3
So HL + 3*(3m6c) is a very powerful count for standing on A7 v A.
Note AACpTCp of HL + 3*(3m6c) is the same as the AACpTCp of HL at 0.5% But that ignores the fact that HL + 3*(3m6c) has a much higher SD than HL and so HL + 3*(3m6c) hits an index of 1.3 much more often than that HL hits an index of 1.4.
The logic behind standing on psrc = HL + 3*(3m6c) >= 1.3*dr where dr = decks remaining and psrc = playing strategy running count is that as 3m6c increased there is a deficiency of 3's and an excess of 6's left in the shoe. That means a large 3m6c means is is less likely that if player hit his A7 he would pick up a 3 for a perfect 21 and more likely that he would pick up a 6 for a stiff. Also with excess 6's it is more likely that the dealer has a six in the hole giving dealer an A6 which dealer must stand on in the S17 game and you automatically win by standing on your A7 v A.
With EoR and LSL technique, answers to all blackjack strategy variations can be answered correctly and quickly.
So here is the attached PDF with the LSL calculations and index, CC and AACpTCp calculations.
A7 v 7 stand.pdf
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