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# H17 vs S17: why the dealer’s soft 17 changes your chart
- URL: https://learnblackjack.org/h17-vs-s17-blackjack/
- Published: 2026-08-30T03:53:51.000Z
- Updated: 2026-08-30T15:56:27.000Z
- Description: Whether the dealer hits or stands on soft 17 looks like a footnote. It moves several doubles and surrenders — and it is printed on the table for a reason.
- Author: TwentyOne
- Tags: Table rules, Basic strategy

Look at the felt. Somewhere near the dealer it will say **dealer hits soft 17** or **dealer stands on all 17s**. That is H17 versus S17\. It is one of the highest-leverage rule swaps a player can actually observe without asking a pit boss for the binder.

Soft 17 is Ace-6\. The Ace can still flex. If the dealer must hit that total, they will sometimes improve it — and sometimes bust. The extra hit is, on net, good for the house. H17 games carry a higher house edge than the same game with S17, usually a few tenths of a percent. That is not trivia. It is why downtown and Strip charts disagree in a handful of cells.

## What actually changes for you

Most of basic strategy is identical. The cells that move are concentrated in:

- Some **soft doubles** (especially Ace-7 and Ace-8 against dealer 2–6).
- A few **hard doubles**.
- **Surrender** spots, if the table offers it — 15 or 16 against a 9, 10, or Ace is sensitive to how strong the dealer’s 17-up is.

You do not need to memorize a delta list if you train the correct chart. You *do* need to stop using an S17 poster at an H17 table and calling it “close enough.” Close enough is how extra edge leaks.

## How to sit down correctly

1. Read the table before the first hand. H17 or S17 is not hidden.
2. Set that rule in your trainer. TwentyOne’s chart and drills both follow the toggle.
3. If you play both kinds of games, keep them in separate practice blocks until the differences stop surprising you.

Pair this with [reading the chart](https://learnblackjack.org/how-to-read-blackjack-strategy-chart/) and the [basic strategy overview](https://learnblackjack.org/blackjack-basic-strategy/). Rules are not flavor text. They are the assumptions underneath every letter on the grid.

TwentyOne is for practice, not for live wagering. Changing H17/S17 in the app will not change a casino’s edge. It will change whether the play you rehearse is the play that table actually wants from a basic-strategy player.