According to http://wizardofodds.com/blackjack/appendix16.html, it looks like you should double if you have 8, 9, 10, 11, and A2 through A8. If the dealer has a 10 and some other card besides a 10, there are 8 possibilities, all with equal probabilities; 2, 3, 4, 5, 6, 7, 8, 9. So you will...