Soft 17: Why H17 and S17 Tables Are Not the Same Game
Whether the dealer hits or stands on soft 17 changes the house edge by 0.22% and alters four basic strategy plays. How to spot it and what to do differently.
A soft 17 is any 17 containing an ace counted as 11: A,6 or A,2,4 or A,3,3. The rule governing what the dealer does with it is printed on the felt and is worth about 0.22% of your total action — roughly half the entire house edge at a good table.
- S17 — dealer stands on all 17s. Better for you.
- H17 — dealer hits soft 17. Costs you 0.22%.
To put 0.22% in perspective: it is more than the value of the surrender option, more than the difference between six decks and two, and about half of what you gain by playing perfect basic strategy instead of merely competent blackjack.
Why hitting soft 17 helps the dealer
The intuition that trips people is that hitting a made 17 should be risky. It would be, on a hard 17. On a soft 17 it is free: the ace reverts to 1, so the draw cannot bust the hand.
Meanwhile, 17 is a poor total. Against a player who has stood, 17 loses to 18, 19, 20 and 21, and ties only 17. The dealer holding soft 17 is holding a hand that mostly loses. A costless attempt to improve it is clearly worth taking.
What the dealer risks is ending on a hard 12 through 16 — a genuinely bad total — and then having to draw again with real bust risk. That downside is real, and it is why the rule is worth only 0.22% rather than more. But it is smaller than the upside.
Strategy changes under H17
Four plays change. All of them are cases where the dealer’s improved hand makes your marginal option more attractive, not less.
| Hand | S17 play | H17 play |
|---|---|---|
| Hard 11 vs A | Hit | Double |
| A,7 (soft 18) vs 2 | Stand | Double |
| A,8 (soft 19) vs 6 | Stand | Double |
| 15 vs A (if surrender offered) | Hit | Surrender |
| 17 vs A (if surrender offered) | Stand | Surrender |
The soft 19 double against a 6 is the one that looks wrong. Standing on 19 feels unimpeachable. Under H17 the dealer showing a 6 will now draw to soft 17s and reach 18, 19, 20 or 21 more often, which erodes the value of a static 19 enough to make the extra bet worthwhile. It is a thin edge — but it is the correct play, and it appears on every H17 strategy chart.
Everything else on the main chart is unchanged.
How to read the felt
The layout text is standardised enough to be reliable:
- “Dealer must draw to 16 and stand on all 17s” → S17
- “Dealer must hit soft 17” → H17
- Some tables mark H17 with a small stripe or icon near the dealer’s chip tray
If you cannot tell, ask. The dealer will answer, and it takes five seconds.
In practice
The rule has drifted toward H17 over the past two decades, particularly on lower-minimum tables, and it is frequently paired with 6:5 blackjack payouts on the same felt. If a table is H17 and pays 6:5, the house edge is around 2.0% rather than 0.43% — a game roughly five times as expensive as the one down the aisle.
Priority when choosing a table:
- 3:2 blackjack — non-negotiable, worth 1.39%
- S17 — worth 0.22%
- Double after split allowed — worth 0.14%
- Fewer decks — worth up to 0.19%
- Surrender offered — worth 0.08%
The first item outweighs all the others combined.
Full breakdown: blackjack house edge by rule.