It depends, are we talking early (aside from early surrender against ace you also might run into the more common ES10 rule) or late? Also note that the H17 rule impacts whether you will surrender 17 v A and 15 v A for basic strategy. In addition to john's index plays, which are for a S17 game, you might also want to learn 16 v 8 (surrender at +4) and 16 v 9 (which I believe, correct me if I'm wrong here, is hit at -1 or lower but a basic strategy surrender).