Basic strategy chart for S17 vs H17 and 6-deck DAS

Basic Strategy Chart: How to Pick the Right Blackjack Chart for S17 vs H17, Deck Count and Surrender

Estimated reading time: 6 minutes

How to pick the right basic strategy chart for your table

Don’t guess. Follow this checklist every time you sit down.

• Count the decks. Single-deck strategy charts differ from multi-deck charts. Make sure the chart you use matches the deck count printed on the table or listed in the game info online. Wizard of Odds publishes dedicated single-deck charts you can use as references.
• Check S17 vs H17. Does the dealer stand on soft 17 (S17) or hit it (H17)? That single rule changes a handful of plays and the house edge. Use the chart that explicitly matches S17 or H17 for your table.
• Look for doubling rules. Can you double after splitting (DAS)? Are doubles restricted to certain totals? Those permissions alter split and double decisions on the chart.
• Note surrender availability. If late surrender is offered, certain hard totals (most notably hard 16 vs dealer 10) should be surrendered rather than played. If surrender isn’t available, the chart will tell you different plays.
• Resplit and ace rules. Some tables let you resplit pairs multiple times and allow resplitting aces; others don’t. Those restrictions change the expected value of splitting certain pairs.
• European vs American rulesets. European-style blackjack and other variants remove the dealer peek or change how the dealer gets their cards; use a chart made for that variant if that’s the game in front of you.

The simplest habit that separates good players from pretenders: read the small print on the table and match it to the chart.

A generic “blackjack basic strategy” page is fine for studying, but it’s not enough at the table.

Common rule changes: basic strategy chart for S17 vs H17 and deck count

Two of the most common changes you’ll see — S17 vs H17 and the number of decks — deserve special attention because they're everywhere and they move both strategy and expected return.

First, S17 vs H17. A dealer who hits soft 17 (H17) is demonstrably worse for the player than one who stands (S17).

Wizard of Odds explicitly notes that games where the dealer hits soft 17 are less favorable to the player, so the chart you use must reflect whether the dealer hits or stands on soft 17.

Second, deck count. More decks generally tilt the math back towards the house.

A single-deck chart will not give the same plays as a six- or eight-deck chart. Wizard of Odds maintains separate strategy pages for single-deck and European-style games so you can align your decisions precisely.

Bottom line: find the table rules, then download or pull up the chart that lists those same rules.

If the game is labelled “S17, 6-deck, DAS, late surrender,” that full string is what your chart needs to assume.

Specific play switches and quick, memorable examples

Charts are full of edge cases. Here are the handful worth memorising because they come up constantly and they're easy to apply.

Surrender: the classic “save half” play

If the table allows late surrender, the canonical example is to usually surrender hard 16 against a dealer 10.

The logic: a hard 16 vs a dealer 10 is a disaster waiting to happen, and surrendering forfeits only half your bet instead of playing a marginal hand to near-certain loss.

Remember: surrender means you lose half the wager immediately. It’s not an excuse to be timid — it’s a mathematical escape hatch.

Split aces and eights — and why

Two pairs required to memorize: always split aces; split eights.

Splitting aces gives you two hands starting with the strongest single card in the deck (and usually only one additional card per ace in most casinos), dramatically increasing your chances of hitting 21 or 20 on at least one hand.

Splitting eights is counterintuitive until you realise a hard 16 is the worst total to stand with or hit from.

Two hands starting with an 8 each have more playability than one 16, which is why the math favors splitting.

William Hill’s guide explains this cleanly: splitting aces and eights improves your expected results compared to standing on or hitting a 16 as a single hand.

Doubling decisions you should know

Two rules of thumb from basic strategy lists:

• Double hard 10 or 11 against dealer upcards where your total is favorable. This is high-ev play because the chances of improving to a strong final total are high.
• Double a hard 9 in the specific dealer-upcard situations the chart designates. The exact dealer cards that make doubling 9 profitable vary with the rule set, which is why using the correct chart matters.

Those “double where favorable” plays are where basic strategy extracts positive expectation from large single-card draws.

How rule combos move the house edge

Basic strategy doesn’t create an edge for the player; it minimizes the house edge for a given ruleset.

The exact house edge depends on the full combination of rules.

For context, Wizard of Odds lists an example basic-strategy house edge around 0.62% for a commonly-cited standard rule set when a player uses correct basic strategy.

That’s not a promise — it’s a mathematical result under one set of rules and assumptions.

On the other hand, Wizard of Odds also notes an example where a Las Vegas-style single-deck game with the dealer hitting soft 17 and no doubling after split shows a different edge — about 0.18% in the cited example under those particular constraints.

The point is not the exact numbers so much as the message: changing one rule such as H17 vs S17 or altering doubling/splitting permissions can move the house edge by tenths of a percentage point — enough to matter over a long session.

Rule changes that generally hurt the player include: dealer hits soft 17, fewer doublings allowed, no DAS, fewer resplits, and more decks.

Rules that help the player include S17, DAS allowed, late surrender offered, and fewer decks.

Using charts at the table and online

Practical workflow:

• Read the table rules — they’re usually printed on the felt or in the game lobby. Match them exactly to a chart.
• Use a physical reference or a phone app while you’re learning. Once you’ve played the correct chart a few hundred hands you’ll internalise the handful of plays that matter most.
• For online games, the rules are almost always listed in the table-info panel. Pull that up and change your chart if the game is S17 vs H17 or single vs multi-deck.

Also remember: basic strategy charts are organised into three sections — hard totals, soft totals (an ace counted as 11), and pairs — and you read them by matching your hand to the dealer upcard to find the recommended action.

If you want a primer on how charts are structured, sites like Casino.com explain the three-section layout clearly.

One tiny etiquette note for live play: if you check a chart on your phone at a crowded table, do it discreetly.

Dealers and pit staff don’t love the spectacle, even though it’s perfectly legal.

Responsible gambling note: basic strategy reduces the house edge but doesn’t remove variance. Play within your means — the chart helps mathematically, it doesn’t guarantee any session will end in profit.

Common traps and misconceptions

Memorising one “universal” blackjack basic strategy and using it everywhere is lazy math. The correct strategy varies with rules.

A single-deck S17 game and an eight-deck H17 game will have overlapping plays, but they’re not the same; the optimal splits, doubles and surrenders diverge in specific spots.

Another trap: thinking basic strategy is a card-counting stand-in. It’s not.

Basic strategy assumes you make decisions only with the dealer upcard and your own hand. Card counting adjusts those same decisions with count information.

If you’re not counting, use the chart that fits the rules and stop trying to “beat” the math with hunches.

Quick reference: what to memorise first

• Split aces and eights — always.
• Surrender hard 16 vs dealer 10 when late surrender is available.
• Stand on hard 17 or higher; hit hard 8 or less.
• Double 10 or 11 when the dealer’s upcard makes it favorable; double certain 9s per the chart.
• Always check if the dealer hits or stands on soft 17 and note DAS/resplit rules before you play.

Those five items will remove the biggest leaks from most casual play.

Want the charts themselves? Use authoritative, rule-specific charts — for single-deck and European rules look at Wizard of Odds’ single-deck and European strategy pages.

For a clear, general walkthrough of how charts work, Casino.com has a concise layout that’s useful when you’re starting to piece rules to charts.

And finally: match the chart to the rules, not the table’s aesthetic. That’s how you stop giving the house fractionally more of your stake every hour.