H17 vs S17: What Changes When the Dealer Hits Soft 17
S17 means the dealer stands on all 17s; H17 means the dealer hits soft 17 (Ace-6). The rule sounds cosmetic and costs you about 0.22% in house edge - more than most players lose to their worst strategy mistake. Below: why the rule favors the house, and every strategy cell it changes, computed directly from our strategy engine.
Why an Extra Dealer Draw Hurts You
Intuition says a dealer who must hit again busts more, and that should help you. The intuition misses what soft means: a dealer redrawing from soft 17 cannot bust on the first draw - the Ace simply drops to 1 and the hand becomes hard. The redraw turns a weak 17 (which pushes your 17 and loses to any 18) into 18, 19, 20, or 21 often enough to outweigh the extra busts it eventually causes. The casino isn't giving the dealer more chances to fail; it's giving a made-but-weak hand a free upgrade attempt.
Every Play That Changes
We ran every hand in the game against every upcard under both rules (6 decks, DAS, late surrender). These are all the cells where the correct play differs:
| Your Hand | Dealer Shows | S17 Play | H17 Play |
|---|---|---|---|
| Hard 17 | Ace | Stand | Surrender |
| Hard 15 | Ace | Hit | Surrender |
| Hard 11 | Ace | Hit | Double |
| A,8 (soft 19) | 6 | Stand | Double |
| A,7 (soft 18) | 2 | Stand | Double |
| 8,8 | Ace | Split | Surrender |
The pattern: H17 makes the dealer's Ace even scarier (more surrenders) and makes marginal doubles slightly better (the dealer's upgrade attempt busts just often enough to reward you having more money on the table against weak upcards). If the table offers no surrender, the surrender rows simply revert to their fallback plays - the interactive chart shows the full grid under any rule combination.
The closest call on the list is 11 vs Ace. Under H17, doubling is correct. In a 4-8 deck S17 game, hitting is slightly better at a neutral count, so the double only returns for card counters at a true count of +1 or higher. In single deck and double deck games, 11 doubles against an Ace under both rules.
How to Spot the Rule (and What It's Worth)
- Read the felt: "Dealer must stand on all 17s" = S17. "Dealer hits soft 17" = H17. It's printed in the arc in front of the dealer, no need to ask.
- Expect H17: it has become the default in most US casinos, including most Strip 6-deck games. S17 survives mainly at higher-minimum tables.
- Price it correctly: 0.22% means an extra $2.20 per $1,000 of action. Worth switching tables for, not worth driving across town for - unless the S17 table also pays 3:2 while yours pays 6:5, in which case the gap becomes enormous.
Frequently Asked Questions
They describe what the dealer does holding a soft 17 (Ace plus 6). S17: the dealer stands on all 17s. H17: the dealer hits soft 17 and keeps drawing until reaching hard 17 or better, soft 18 or better, or busting. The rule is printed on the table felt.
S17. The dealer hitting soft 17 adds about 0.22% to the house edge, because the extra draw improves the dealer's weak 17 more often than it busts them. All else equal, always choose the table where the dealer stands on all 17s.
A dealer 17 is a weak made hand - it only pushes your 17 and loses to 18+. Redrawing from soft 17 can't make the dealer's hand worse than 17 without busting, and an Ace-heavy redraw turns many of those weak 17s into 18-21. The occasional extra bust doesn't compensate.
Six cells in a 4-8 deck game: surrender 15, 17, and 8,8 vs Ace, and three extra doubles - hard 11 vs Ace, soft 18 vs 2, and soft 19 vs 6. Soft 17 itself plays the same under both rules (double against 3-6, otherwise hit). Everything else on the chart is identical, so learn one chart and memorize the short H17 patch list.
The Trainer Knows Both Rule Sets
Flip H17 on and off in settings and drill the differences.
Practice H17 Games