As I am sure you are aware of, the indice will change depending on the dealers up card. This play is usually reserved for the desparate tourney player's last hand or two. I once DD with 9,A vs can't remember with no indice for same and got my A (yes, I too give "special consideration" to the Ace). It was simply wonderful until I felt the heat from the pit and the table. It was rather uncomfortable! ;> I think this play really goes beyond counting and Ace richness. Keep your eyes peeled for the new book
"Blackjack Ace Prediction:
The Art of Advanced Location Strategies for the Casino Game of Twenty-One" It is rather evident why Thorp didn't want to publish on it and why my chapter Card Sequencing: Smart-Bomb Accuracy" is so short! ;> Some things should be reserved for your memoirs....