the fab4 are late surrender indices. published in Blackjack Attack by Don Shlesinger.
14v10 at 3
15v10 at 0
15v9 at 2
15vA at 1
with regards to surrender you also have a specific basic strategy for games that allow late surrender. involves 16v9,10 & A . for 6d s17dasls games (that i know of)