Do the Basis Strategy grids take into account that the dealer is checking to see if he has blackjack with an Ace or 10 up? Given that Basic Strategy grids reflect the better of 2 (or 3) expected outcomes, doesn't the expected outcome (and thus your play) change with the knowledge that the dealer does not have blackjack? For example, should I not double down on 10 versus a dealer Ace given that he has only a 1 in 9 chance (we know he doesn't have a 10) of making 20 on his next card where I have a 5 in 13 chance of making 20 or better on my next card? I have an 8 in 13 chance of making a pat hand where the dealer has only a 4 in 13 chance of making a pat hand on his next card. If I am right about this, is there a Basic Strategy grid out there that reflects the fact that the dealer is checking for blackjack?