Blackjack Basic Strategy Chart & Guide

The Five Rules People Get Wrong Most Often

1. Always split aces and eights. Two eights against a dealer 10 feels hopeless, but hard 16 is the worst hand in blackjack. Splitting turns one terrible hand into two playable ones.
2. Never split tens. A made 20 loses only to a dealer 21. Breaking it up trades one of the strongest hands in the game for two merely good starts.
3. Hit hard 12 against a dealer 2 or 3. Most players stand on any 12 against a "bust card," but a dealer 2 or 3 makes a hand more often than it busts. Stand only when the upcard is 4, 5, or 6.
4. Double soft 18 (A-7) against 3 through 6. Eighteen feels like a hand to protect, but against a weak dealer upcard the double is worth more than the stand.
5. Surrender hard 16 against 9, 10, or ace (unless it's a pair of 8s, which you split). When every way of playing a hand loses more than half your bet on average, giving up half is the profitable choice.

How Casino Rules Change the House Edge

The rule placard changes the house edge far more than most players realize. A 6:5 payout alone costs more than every other bad rule below combined. Approximate effects, relative to a standard multi-deck 3:2 game:

Stack enough of the good rules together and the math says the edge can, in principle, cross zero. A generous enough combination hands the player a positive expected value off the top. In practice, casinos rarely (if ever) offer that combination: expect even the best real-world games to keep a small edge of a few tenths of a percent. The realistic route to positive expectation is deck composition, covered in the next section.

You can reproduce these numbers yourself: set any rule combination on the settings page and watch the calculator's expected values shift.

Beyond Basic Strategy: Deck Composition

As cards leave the shoe, the optimal play drifts away from the chart. The classic example is 16 vs 10: the chart says hit (or surrender), yet when the remaining shoe is rich in tens, standing becomes correct. Card counters memorize these "index plays"; the calculator computes them exactly from the remaining deck composition.

The best way to learn is to practice: play the free blackjack simulator with real-time optimal-move feedback, or test yourself with today's daily challenge.