Do you know the right play?

Basic strategy is completely solved — there’s exactly one correct answer for every hand. Most people get the tricky ones wrong: splitting 8s against a dealer 10, hitting a stiff 16, doubling a soft 18. This quiz is weighted toward exactly those hands.

What a score here actually means

The questions are drawn from 26 hand classes against all 10 dealer up-cards — 260 spots, filtered to the totals where basic strategy is least obvious. That pool has a shape, and knowing it is the difference between a score and a number. The correct answer is Hit 40% of the time, Stand 23% of the time, Split 20% of the time, Double 17% of the time.

So there is a floor worth knowing before you start: a player who never reads the question and always taps Hit scores 40.0%. Guessing uniformly at random scores about 30%. Anything at or below 40% means the quiz has told you nothing you did not get for free — which is a more useful thing for a quiz to admit than a congratulatory message.

Most of it is recall, and the rest is the argument

Of those 260 spots, only 22 — 8.5% — are genuinely close, meaning the best play beats the runner-up by less than 0.02 of a unit. The other 238 have a clear answer, so getting them wrong is a memory failure rather than a judgement call. The tight ones are where every argument you have ever heard at a table lives, and this site gives each of them its own page.

The tightest in the whole pool is Hard 16 against a 10, where hit wins by 0.0006 of a unit. That is the most argued-about hand in blackjack, and playing it the wrong way every single time you held it would cost you 0.0129 house-edge points — see what that is in money. The decisions people argue about are the cheap ones, which is not a coincidence: a call only becomes contentious when the two options are worth almost the same.