So far I have been using the index numbers in Stanford Wongs Blackjack Secrets pg 56. I just recently read Don Schlesingers BJA3 and was surprised to see the same variations on strategy but at different counts. For example Wong says 12 v 3 stand with a count of 1 while Don says to wait for a count of 2 to stand. Wong also says to stand on 13 v 3 with a count of -1 but Don says -2. There are a few more differences that I will not list just to save space but I was wondering which ones were more accurate and why are they different? I have already commited all of Wongs index numbers to my head and want to know if I should relearn Dons instead?