What a soft hand is
A soft hand contains an ace that is currently counted as 11. An ace and a 6 is a soft 17, because the ace can be 11 without busting. Draw a ten and the hand becomes a hard 17, as the ace must now count as 1.
The main feature is that a soft hand cannot bust on the next card. Whatever you draw, you either improve or keep a hand with a different total. This changes the calculation on two fronts: you can afford to hit totals you would normally stand on, and you can double with more confidence, because the downside of a single card is limited.
The three questions
For every soft total, basic strategy is answering three questions in order.
- Is the hand already good enough to stand on? (Soft 19 and 20 are, almost always.)
- If not, is the dealer weak enough to justify a double? (The extra bet works best when the dealer is likely to bust.)
- If not, hit. The ace means that hitting is never as risky as it would be with a hard hand.
Most of the rows come from applying those questions.
Soft 13 to 16 (ace-two to ace-five)
These are weak totals, but the ace offers a safe drawing opportunity. The chart usually hits them, and doubles in a narrow band when the dealer shows a 4, 5 or 6 (and 5 or 6 only for the lowest ones).
The logic is that the total is low, so even a good draw leaves a modest hand, and the extra bet only pays when the dealer is likely to bust. Against a 6, the dealer is at their weakest, so doubling a hand that can’t be hurt on the draw is attractive. Against a 7 or higher, the dealer is expected to finish with a made hand, and a double would put more money out on a weak total.
A card-by-card check helps. Take a soft 15 (ace and 4): a 6 makes 21, a 5 makes 20, and a ten makes a hard 15, which is worse than the starting position. A hit is a single step to a better position about as often as not, which is why the double is only worth it where the dealer is already vulnerable.
Soft 17 (ace-six)
Soft 17 is one of the clearest examples of why you never stand on it. Standing on a total of 17 wins only when the dealer busts or finishes lower, and a soft 17 has the benefit of a free draw. The standard play is to double against 3 through 6 and hit everywhere else. (Some charts also double against the 2 when the dealer hits soft seventeen, or in single-deck games.)
Soft 18 (ace-seven): the borderline hand
Soft 18 is the most mixed row, which makes it a good test of the reasoning. It is neither strong nor weak.
- Double against a weak card (3 to 6). An 18 is a decent hand, but a free draw can improve it to 19, 20 or 21, and the dealer is vulnerable.
- Stand against 2, 7 and 8. An 18 beats or ties the dealer’s likely outcomes of 17 or so, and drawing risks making things worse.
- Hit against 9, 10 and ace. The dealer is likely to reach 19 or 20. An 18 will usually lose, and as it cannot bust, drawing is the sensible response.
The fact that one hand has three different instructions is the essence of the topic. The hand does not change, but the dealer’s card changes what the hand needs to do.
Soft 19 and 20 (ace-eight, ace-nine)
These are strong hands, and the usual play is to stand. Since a made 19 or 20 already wins against most dealer outcomes, hitting would turn a good hand into a poorer one. Some charts double soft 19 against a 6 in games where the dealer hits soft 17, but the margin is small and the rule is table-dependent. This is one of the cells covered in the discussion of strategy adjustments.
Why the dealer rule on soft 17 touches these rows
When the dealer must hit a soft 17 instead of standing, the dealer’s hand improves slightly and the player’s edge shrinks. A few soft-hand doubles are added to compensate. Details of the dealer’s rule are given in the soft seventeen article, and the broader effects are discussed in the piece on rule variations.
A common mistake
Players often treat soft hands as safe and therefore double too often, or treat soft 18 as a made hand and always stand. Both ignore the dealer’s upcard, which is the whole point of the table. Simple errors like these are listed in the article on strategy errors.
Keeping expectations realistic
Playing soft totals correctly reduces the average cost of each hand, but it does not guarantee a profit. Doubling also raises the amount at risk, and variance is large. Past hands do not change the odds of the next one.
Treat blackjack as entertainment, set limits you can afford, and contact a local support service if you feel your play is becoming a problem.