Should you double soft 17 against a 2?

Why

Stand on soft 17 and the best you can do against a dealer who makes a hand is tie a 17. With a 2 showing, the dealer ends on exactly 17 13.0% of the time and on 18 or better 51.3%.

A 2 is weak, but not weak enough to double soft 17 into. The book doubles it against a 3 through 6, where the dealer goes over 21 more often. Here, take a card: it can't break a soft hand.

When the answer changes

At the app's table (six decks, the dealer hitting soft 17, double after split and late surrender) the book hits soft 17 against a 2. With a single deck, the book doubles instead. Every other rule set plays it the way the app's table does.

The full basic strategy chart for six decks, dealer hits soft 17, with every other rule set a tap away.

The same chart with a single deck.

Questions