Optimal strategy for the player is to stand on 18 or higher when the dealer shows a 9, stand on 16 or higher when the dealer shows a 5 or 6, and stand on 17 or higher against all other dealer upcards. | Optimal strategy for the player is to stand on 18 or higher when the dealer shows a 9, stand on 16 or higher when the dealer shows a 5 or 6, and stand on 17 or higher against all other dealer upcards. |