Gambling terms, explained straight

Casino & Table Games

Blackjack das meaning

DAS stands for double after split, a blackjack rule that lets a player double their bet on a hand created by splitting a pair.

Full name
Double after split
How it works
After splitting a pair, you may add an equal extra bet and receive one more card to that hand.12
Applies to
Standard blackjack and variants that allow splitting and then doubling on split hands.

Key points

  • DAS is an optional table rule, not part of every blackjack game.1
  • When allowed, it gives the player an extra opportunity to increase a wager on a favourable split hand.2

Where this term is used

Casino games Blackjack The card game in which DAS may be offered as a rule. Casino games Insurance blackjack A side bet offered when the dealer shows an ace, unrelated to splitting or doubling. Casino games Basic strategy blackjack The mathematically optimal way to play, which changes when DAS is available. Casino games Blackjack strategy card A reference card that shows the correct play for each hand, including DAS decisions. Casino games Blackjack rules dealer The rules the dealer follows, which are independent of player options like DAS. Casino games Blackjack 21 Another name for the game of blackjack, where DAS may be a table rule.

Sources

  1. Aces and eights (blackjack) - Wikipedia en.wikipedia.org Defines DAS as double after split in blackjack.
  2. Blackjack wizardofodds.com States the DAS rule and its application.

Sources are drawn from regulators, universities and published research, and each one is labelled with what it actually is — a preprint is not called a paper. Bookmaker and affiliate pages are never cited here, because a page that sells betting is not a neutral authority on it.

Written and maintained by Ellis Warrender, writer and maintainer.

Last updated 28 July 2026. Spotted an error? Tell me and it gets fixed and logged on the corrections page.