Should you split aces against an ace?
Split. The book splits aces against every dealer card.
Why
Kept together, two aces are 2 or 12, a poor start. Split, and each ace starts its own hand: a 10, jack, queen or king on one makes 21.
Against an ace the dealer ends on 17 or better 79.9% of the time, after checking for blackjack. The book splits aces anyway, against every dealer card.
When the answer changes
This one doesn't change. Every rule set the chart covers splits aces 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 split aces against a 10?
Yes. Against a 10 the book splits aces. 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 splits. So does every rule set the chart covers.
More hands
- Should you split 8s against an ace?
- Should you split 9s against a 10?
- Should you split 8s against a 10?
- Should you split 10s against a 6?
- Should you split 9s against a 7?
- Blackjack hands, one at a time
Guides
Know the book before you sit down.
