Blackjack basic strategy

Basic strategy is the mathematically optimal way to play every blackjack hand — the single best decision for your cards against the dealer's upcard. Play it perfectly and you cut the house edge to roughly half a percent. It's also the foundation everything else, including card counting, is built on.

What basic strategy is

For every combination of your hand and the dealer's upcard there is one play with the highest expected value, computed from the probabilities of every possible outcome. Following that play every time — no hunches, no “feel” — is basic strategy. It won't win every hand (nothing can), but over time it loses the least.

The three charts

Every cell below is generated by the same engine that grades you in the trainer, for our default table rules (dealer stands on soft 17, double after split, late surrender). Read them as: your hand down the left, the dealer's upcard across the top. H = hit, S = stand, D = double down, SP = split, SUR = surrender.

Some cells assume an option you might not have. On these charts, every SUR cell becomes a hit if your table doesn't offer surrender, and every D becomes a hit once you're past two cards and can no longer double — with one exception: soft 18 (A,7) against 3 through 6, where you stand rather than hit when you can't double.

Hard totals

Hands without an ace, or where the ace must count as 1. The key idea: stand on stiff totals (12–16) when the dealer shows a weak card (2–6) and let them risk busting; hit when they show 7 through Ace. Double 11 against almost anything, and double 10 and 9 in the right spots.

Soft totals

Hands with an ace counted as 11 (A,6 = “soft 17”). Because you can't bust with one hit, soft hands are aggressive: you double against the dealer's weak cards and hit to improve otherwise. Soft 18 is the classic trap — it's not always a stand.

Pairs

Whether to split. Always split aces and eights; never split tens or fives. The rest depends on the dealer's upcard and whether doubling after a split is allowed.

These are the default-rules charts — for one that follows your own table rules, open the strategy chart, and to actually commit them to memory drill them in the decision trainer.

Your table rules change a few cells

Basic strategy isn't one fixed chart — a handful of plays flip with the rules:

• H17 vs S17 — whether the dealer hits soft 17 shifts several doubling and surrender decisions.
• DAS — when you can double after splitting, you split a few more pairs.
• Late surrender — adds spots like 16 vs 10 and 15 vs 10.
• Deck count — single-deck and double-deck games flip a few more cells. The charts here are for the usual 4–8 deck shoe.

That's why our strategy chart follows your table rules — change the soft-17, double-after-split or surrender rule and the affected cells update.

The most common mistakes

• Taking insurance — it's a side bet that loses money unless you're counting.
• Standing on soft 17 instead of hitting or doubling.
• Not splitting 8s against a strong dealer card (you should — almost always).
• Failing to double 11 (and often 10) when the dealer is weak.
• Playing by “table feel” instead of the chart.

Memorize it the fast way

Staring at a chart doesn't build recall — reps do. The decision trainer deals real hands, grades every hit, stand, double, split and surrender instantly, and explains the why until the right play is automatic.