Hi, I am using cvbj and the tables for Hi-Lo I18 F4 when using 6 decks, enhc, s17. These show surrender a pair of 7s against a dealer 10 on all counts, but to surrender 14 against a dealer 10 on a TC of 3. Could someone explain the reason why you would surrender 77 but not another 14 on a TC < 3? I cant find any reference to this decision in Professional Blackjack and am struggling to wrap my head around the play.