Ok I'm a little confused. 16 against a 10 you hit on a zero running count. 12 against a 4 you would stand on a zero running count. So for A7 against a 2 and an 11 against an ace would I double at zero or above for both of them or double just at anything above a 0 running count. I guess this is a question of how to read the index numbers. I know basic strategy says to always double, so I'm guessing that I would double at a running 0 as well? These numbers are for H17 multi deck game. And I got these indices from Professional Blackjack the 1994 edition so I hope they are correct, there seem to be different indices in different books and websites. For example some say to split 10,10 against a 6 at a true 4 and some say to split at a 5. I guess it depends on whether you are truncating or rounding and the rules of the game? I'm sorry I know some of these questions probably have been answered before. I have tried to find some clarification, but I am still confused about those specific deviations as stated above. Thanks to anyone reading and answering this post. I forgot to mention A8 against a 6. Also double a a running 0?