Reading Basic Strategy Charts

Basic strategy is a single chart that gives the mathematically best move for every hand against every dealer upcard. Play it perfectly and you cut the house edge to roughly 0.5%. It isn't a hunch or a guess — it's the solved answer to a game whose rules never change.

The chart works because the dealer follows a fixed script. They must draw to 16 and stand on 17 or higher, with no choices allowed. Because their behavior is entirely predictable, every one of your decisions has one correct answer that wins the most, or loses the least, over the long run. Mathematicians solved it by hand decades ago, and computers have since checked every cell across billions of hands. The chart below is that consensus answer, built for the most common rule set: 4-8 decks, dealer hits soft 17, double after split allowed, 3:2 payouts.

How to read it. Find your hand down the left column and the dealer's upcard across the top. The cell where they meet is your move.

Hard totals — hands with no flexible ace — are where most of your decisions live. Notice the clean block of standing against a dealer 2 through 6, and the wall of hitting against 7 through ace.

One quirk stands out: you double an 11 even against a dealer ace under this rule set, which differs slightly from stand-on-soft-17 games.

Soft totals can't bust on one card, so the chart gets aggressive with doubling — squeeze extra bets in while the dealer looks weak, fall back to hitting when they don't. Watch soft 18 (ace-7): it looks strong but still loses often, so you double against weak dealer cards and stand only against 7 or better.

Pairs. Splitting turns one hand into two, with a second bet. Two rules never bend: always split aces and 8s, never split 5s or 10s. A pair of 5s is a hard 10 you'd ruin by splitting; a pair of 10s is already a 20, so leave it alone. This chart assumes doubling after split is allowed.

Late surrender adds a few more moves: surrender hard 16 (excluding 8,8) vs. 9, 10, or ace, and hard 15 vs. 10.

Two facts drive every cell: the dealer's fixed script and finite-deck math. Because the dealer must hit until reaching hard 17, a low upcard like 5 or 6 is genuinely weak, so you stand on stiff 12-16 totals and let them break. Against 7 or higher they'll likely make a strong hand, so you must improve or lose by default. Roughly a third of the shoe is worth ten, which is why an 11 doubles so freely. Deck count nudges a handful of cells slightly — see how deck count affects play.

What changes if the dealer stands on soft 17 instead? Not much — learn the hit-soft-17 chart above and you're covered almost everywhere. A few hands flip: hit 11 vs. ace instead of double, and stand on soft 18 vs. 2 or soft 19 vs. 6 instead of doubling. Check the felt; the H17 chart costs you almost nothing at an S17 table.

How much does perfect play save you? A lot. Casual players guessing by feel face a house edge around 2% to 3%; perfect basic strategy drags that to roughly 0.5% — though rules still move that number, as covered in house edge by rule variant. The single biggest trap remains a 6:5 payout, which quietly triples your cost even with flawless play.

Basic strategy shrinks the house edge, but it never flips it. Over enough hands the casino still expects to win, so treat blackjack as entertainment with a known cost, not a way to make money. Set a budget you're comfortable losing, and stop when you hit it. If gambling stops feeling fun, use the deposit limits, timeouts, and self-exclusion options in Wild.io's responsible gambling tools.

Sources

• Wizard of Odds — Blackjack Basics (retrieved July 2026)
• Blackjack Apprenticeship — Strategy Charts (retrieved July 2026)
• Vegas Aces — History of the Blackjack Strategy Guide (retrieved July 2026)