When the dealer hits soft 17, the optimal basic strategy for blackjack is slightly different than when the dealer stands on all 17s. In this case, the player should stand on hard totals of 12 through 16 when the dealer's upcard is a 2 through 6. The player should also hit on hard totals of 12 through 16 when the dealer's upcard is a 7 or higher. When it comes to doubling down, the player should double down on hard totals of 9, 10, and 11 when the dealer's upcard is a 2 through 6.