At my local casino, they have a rule called Double Down Rescue (surrender after doubling). Unfortunately (for the casino!), at least some of the dealers apparently don't understand this rule and allowed me to hit after doubling down! I have never seen any numbers for this but I suspect it would give me an edge off the top of the shoe. Could anyone provide some analysis along with strategy deviations? The game is 6dk, H17, DAS. Thanks in advance.