Should you double 10 against an ace?
Hit. The book hits 10 against a 10 or ace and doubles against the rest.
Why
Against an ace the dealer ends on 17 or better 79.9% of the time, after checking for blackjack, and on 19 or better 50.9%.
Doubling locks you into one card for twice the bet, and from 10 only 6 of the 13 ranks reach 19 or better. Take a card and keep your choices open. The book doubles 10 against every dealer card but a 10 or ace.
When the answer changes
This one doesn't change. Every rule set the chart covers hits 10 against an ace: one, two, six or eight decks, the dealer hitting or standing on soft 17, with or without double after split and surrender.
The full basic strategy chart for six decks, dealer hits soft 17, with every other rule set a tap away.
Questions
Should you double 10 against a 10?
No. Against a 10 the book hits 10. A dealer showing a 10 goes over 21 23.0% of the time, after checking for blackjack.
Is it different at a single-deck table?
No. At the app's table with a single deck, the book still hits. So does every rule set the chart covers.
More hands
- Should you double 10 against a 10?
- Should you double 11 against an ace?
- Should you double 11 against a 10?
- Should you hit 15 against an ace?
- Should you hit 16 against an ace?
- Blackjack hands, one at a time
Guides
Know the book before you sit down.
