DAS (Double After Split)
DAS stands for "Double After Split"—the option to double down on hands created by splitting a pair. This player-friendly rule reduces the house edge by approximately 0.1%.
How DAS Works
- You split your 4-4 into two hands
- First hand receives a 7, giving you 11
- With DAS, you can now double down on that 11
- Without DAS, you can only hit or stand
Why DAS Matters
DAS makes certain splits profitable that wouldn't be otherwise:
| Pair | Without DAS | With DAS |
|---|---|---|
| 2-2 vs. 2 | Hit | Split |
| 3-3 vs. 2 | Hit | Split |
| 4-4 vs. 5-6 | Hit | Split |
| 6-6 vs. 2 | Hit | Split |
When you can double after splitting, low pairs become more valuable because you might catch a favorable doubling opportunity.
Strategy Adjustments
Basic strategy charts differ slightly based on DAS availability. More pairs are worth splitting when DAS is allowed.
Pair Splits
Dealer first card
Player hand
-
2
3
4
5
6
7
8
9
10
A
A,A
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
T,T
N
N
N
N
N
N
N
N
N
N
9,9
Y
Y
Y
Y
Y
N
Y
Y
N
N
8,8
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
7,7
Y
Y
Y
Y
Y
Y
N
N
N
N
6,6
DAS
Y
Y
Y
Y
N
N
N
N
N
5,5
N
N
N
N
N
N
N
N
N
N
4,4
N
N
N
DAS
DAS
N
N
N
N
N
3,3
DAS
DAS
Y
Y
Y
Y
N
N
N
N
2,2
DAS
DAS
Y
Y
Y
Y
N
N
N
N
Y = split
N = no split
DAS = split if double-after-split allowed
Finding DAS Tables
Most modern blackjack games allow DAS. Check table rules or ask the dealer. Games without DAS are uncommon but do exist.