TablesRules

Double after split: a player-friendly blackjack rule

Double after split, or DAS, lets you double down on a hand you made by splitting a pair. It lowers the house edge by about 0.14% and makes some extra splits worth playing.

Reviewed Oct 15, 2026

Answer first

90s

01Double on hands made by splitting.
02Lowers the house edge by about 0.14%.
03Changes some split decisions.

Key numbers

DAS at a glance

0.14%Edge cutRough value

2Hands after splitEach can double

2xBet on doubled handPer hand

6Extra splitsStrategy changes

In short

Key takeaways

DAS is good for the player.
Check the table placard.
Strategy splits more pairs with DAS.
Split aces usually cannot double.

Progress

How DAS works

1
Pair dealt
e.g. 8-8
2
Split
Two hands, two bets
3
Draw
Each hand gets a card
4
Double
If 10 or 11, double
5
Settle
Each hand vs dealer

Each split hand is played and paid on its own.

Splits that change with DAS

Pair	Dealer up card	No DAS	With DAS
2-2	2 or 3	Hit	Split
3-3	2 or 3	Hit	Split
4-4	5 or 6	Hit	Split
6-6	2	Hit	Split

Multi-deck, dealer stands on soft 17; check a chart for your rules.

Why DAS helps the player

Splitting low pairs against a weak dealer card often leaves you with a 10 or 11 on one hand. With DAS you can double that hand for more money at a good moment.

Without DAS you must just hit the 10 or 11, which wastes the best doubling chances. That is why the same split can be right with DAS and wrong without it.

The total value is about 0.14% of the house edge. On a six-deck game that is a meaningful share of the edge, which often sits near 0.5% with good rules.

Example house edge with and without DAS

Game	No DAS	With DAS
6 decks, S17, 3:2	0.56%	0.42%
6 decks, H17, 3:2	0.78%	0.64%
8 decks, S17, 3:2	0.58%	0.44%

Rough figures with perfect basic strategy; small rule changes move them.

What DAS does not allow

Split aces usually get one card each and cannot be doubled or split again, even at DAS tables. Some rare games allow it, but few US casinos do.

DAS also does not change the doubling rules elsewhere. If the table only allows doubling on 10 or 11, that limit also applies after a split.

Look for “DAS” or “double after split allowed” on the table placard. If it is not listed, ask the dealer before you sit down.

Sequence

Using DAS well

Step 01
Read the placard
Is DAS allowed?
Step 02
Use the right chart
DAS version.
Step 03
Split low pairs
Against 2 to 7.
Step 04
Double 10 or 11
After the split.
Step 05
Keep chips ready
Doubles add bets.

A worked example

You bet $25 and get 4-4 against a dealer 6. With DAS, you split into two $25 hands. The first hand draws a 7 for 11.

You double that hand for another $25. It draws a 10 for 21. The second hand draws a 10 for 14, and you stand against the 6.

The dealer busts. You win $50 on the doubled hand and $25 on the other, $75 in total. Without DAS, you would have hit 8 instead, and won $25.

Floor rules

DAS terms

Know before you sit

DAS: Double after split allowed.
Resplit: Splitting a split hand again.
S17 / H17: Dealer stands or hits soft 17.
Placard: Table sign with rules.

A quick strategy check

You hold 2-2 and the dealer shows a 3. With DAS, basic strategy splits, because a 2 plus a 9 or 8 gives a strong doubling hand.

Without DAS, you hit the 4 instead. The split is worth less when you cannot double the 10 or 11 hands it often creates.

You hold 6-6 and the dealer shows a 2. With DAS you split; without it you hit. Against a 3 through 6, you split 6-6 under both rule sets.

Common mistakes

Using a no-DAS chart: Miss good splits.
Doubling split aces: Usually not allowed.
Not checking the placard: Rules vary.
Short on chips: Doubles need cash.

Keep reading

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After the 90 seconds

Questions before and after you play

A 90-second guide cannot cover every table moment. Tap a group, then a question — answers are short paragraphs, not one-liners.

01Basics

What does DAS mean in blackjack?

Double after split. It means you may double down on a hand that you made by splitting a pair.

Is DAS good for players?

Yes. It lowers the house edge by about 0.14%, so look for tables that allow it. House rules can vary, so check the table placard or ask the dealer.

Can I double split aces?

Usually not. Split aces normally get one card each and cannot be doubled, even at DAS tables.

02Rules

How do I know if a table allows DAS?

Check the table placard or ask the dealer. Many shoe games in the US allow it. House rules can vary, so check the table placard or ask the dealer.

Does DAS change soft 17 rules?

No. DAS is separate from whether the dealer hits or stands on soft 17. House rules can vary, so check the table placard or ask the dealer.

Do I need extra chips?

Yes. A split adds a bet and each double adds another, so keep enough chips in front of you.

03Strategy

Which splits change with DAS?

Mainly 2-2, 3-3, 4-4 and 6-6 against certain weak dealer cards, which become splits when DAS is allowed.

Should I split 4-4 without DAS?

No. Without DAS, basic strategy hits 4-4 against every dealer up card. House rules can vary, so check the table placard or ask the dealer.

Where can I get help?

If gambling stops being fun, call or text 1-800-GAMBLER for free, private help any time of day.

Sources

Wizard of Odds — Blackjack Not from a registry (Reference source, not an official registry) · accessed Oct 15, 2026Rules, house edge and strategy
Nevada Gaming Control Board · accessed Oct 15, 2026Approved games and gaming revenue reports
UNLV Center for Gaming Research Not from a registry (Reference source, not an official registry) · accessed Oct 15, 2026Research library on casino games and gambling
National Council on Problem Gambling — Help and resources Not from a registry (Reference source, not an official registry) · accessed Oct 15, 2026Free, confidential help: call or text 1-800-GAMBLER