Can someone please help me better understand the reason for hitting on a 15 vs a dealer ace rather than surrendering? I am refering to basic strategy for a 6 or 8 deck game with late surrender where dealer stands on soft 17. I understand surrendering vs the 10 but why not surrender against an ace? I think I've got a fairly good understanding of mathematics and I've been able to see the reason for most basic strategy rules but I have never liked that particular play. If anyone can point me in the right direction here I would appreciate it. Thanks