Basic strategy in multiple deck with a hole card: Always hit Soft 17, hit Soft 18 against 9, 10 and Ace. Always stand on hard 17. Double 9 against 3 through 6, double 10 and 11 if your total is higher than dealer's upcard. Stand on 12 vs 4, 5 or 6 Stand on 13, 14, 15 and 16 against 2 through 6. Double Soft 18 and Soft 17 vs 3 thruogh 6, Double Soft 16 and Soft 15 vs 4, 5 and 6 and Double Soft 14 and Soft 13 against 5 and 6. Always split Aces and 8's. Never split 5's and 10's. Split deuces and threes against 2 through 7. Split 4's only against 5 and 6. Split 6's against 2 through 6. Split 7's against 2 through 7. Do not split 9's against a 7, a 10 or an Ace otherwise split.