Blackjack Strategy Trainer 21
What H17 means
H17 means the dealer must hit soft 17. A soft 17 contains an Ace counted as 11, so the dealer can take one more card without busting immediately. This extra draw makes the rule worse for the player and adds about 0.22% to the house edge.
The H17 changes worth memorizing
| Hand | Dealer upcard | H17 play | S17 comparison |
|---|---|---|---|
| Hard 11 | Ace | Double | S17 hits |
| A,7 soft 18 | 2 | Double if allowed, else stand | S17 stands |
| A,8 soft 19 | 6 | Double if allowed, else stand | S17 stands |
| 15 | Ace | Surrender if offered, else hit | S17 usually hits |
| 17 | Ace | Surrender if offered, else stand | S17 stands |
| 8,8 | Ace | Surrender if offered, else split | S17 splits |
Why the dealer Ace gets stronger
The dealer Ace is already strong because many hole-card combinations produce 17 or better. H17 adds another path: soft 17 no longer stops. The dealer can convert A,6 into 18, 19, 20, or 21 often enough that the player's borderline decisions shift toward doubling 11 and surrendering certain stiff hands.
How to train H17 without relearning everything
Do not try to memorize two charts from scratch. Learn S17 first, then add the H17 delta above. In practice, most hands are identical. The cost comes from forgetting the few cells that are not identical.
Should you avoid H17 games?
Prefer S17 when all other rules and minimums are equal. But H17 is not the worst rule at the table. A 6:5 blackjack payout is much more expensive. Bad surrender, no DAS, high minimums, and bankroll pressure can matter more than the soft-17 rule alone.