Blackjack Strategy Trainer 21
What soft 17 means
A soft hand contains an Ace counted as 11 without busting. A soft 17 is a total of 17 where one Ace is still flexible. The common example is A,6, but A,A,5 and A,2,4 are also soft 17 because the Ace can drop from 11 to 1 if needed.
The opposite is hard 17. A hard 17 has no flexible Ace. If the dealer hit hard 17, many cards would bust the hand. That is why hard 17 is always a stand for the dealer.
S17 vs H17
| Rule | Meaning | Player impact |
|---|---|---|
| S17 | Dealer stands on all 17s, including soft 17 | Better for the player |
| H17 | Dealer hits soft 17 and keeps drawing until hard 17+ | Adds about 0.22% to the house edge |
H17 is worse for the player because the dealer gets a free chance to improve a weak 17. Since the Ace can convert to 1, the dealer cannot bust on the first hit from soft 17.
How soft 17 changes strategy
The soft 17 rule changes only a small number of basic strategy cells, but the changes are easy to miss. Under H17, hard 11 vs Ace becomes a double, A,7 vs 2 becomes double-if-allowed, A,8 vs 6 becomes double-if-allowed, and several surrender decisions against Ace change when late surrender exists.
That is why a trainer or chart should ask which rule set you play. If you use an S17 chart at an H17 table, you will still be close, but you will leak value in the exact hands where the rule matters.
How to spot the rule
Look for text on the felt or table placard. "Dealer stands on all 17s" means S17. "Dealer hits soft 17" means H17. If the felt is unclear, ask the dealer before betting. Also check blackjack payout in the same moment; 6:5 blackjack is far more damaging than H17.