Blackjack is the casino game with the lowest house edge — and the edge only gets that low when you play correctly. Most players make instinctive decisions and give away 2–4% extra advantage to the house. Basic strategy eliminates most of those mistakes. It is not about counting cards; it is about knowing the mathematically correct play for every combination of your hand and the dealer's upcard.
This guide covers the core decisions: when to hit or stand on hard and soft hands, when doubling down is correct, and the key pairs to always split.
In Blackjack you see one of the dealer's two cards. That upcard drives every decision you make. The dealer's hidden card is statistically most likely to be a 10-value card (10, J, Q, K) — so always assume their hole card is a 10 when estimating their likely total.
The dealer must hit until they reach 17 or higher (in most rules). This creates two clear zones:
If the dealer shows a 6, assume their total is 16 — a stiff hand they must hit and will often bust. If they show a 9, assume their total is 19. This mental model is not always correct, but it is the most statistically sound assumption and forms the basis of all basic strategy decisions.
You cannot bust no matter what card you draw next (since 8 + any card ≤ 18 if the card is 10). Always draw.
Against a weak dealer, doubling gives you more money in with the advantage on your side. Against a strong dealer upcard, just hit.
Hard 10 and 11 are your strongest doubling hands — a 10-value draw makes 20 or 21. Double against most dealer upcards. Against 10 or Ace, hit instead of doubling.
This is the most important rule in the game. Against a weak dealer (2–6), do not hit your stiff hand — let the dealer bust. Against a strong dealer (7–A), you must hit despite the bust risk, because standing is worse.
No exceptions. Standing on 17+ is always correct — the risk of busting outweighs any possible gain from drawing.
Standing on a hard 16 feels wrong — you have a terrible hand and it is tempting to hit. But when the dealer shows a 6, they will bust over 40% of the time. Standing gives you a winning chance without risking your own bust. This single decision is where most players leak the most value by hitting when they should stand.
A soft hand contains an Ace counted as 11. The key advantage: you can always hit without busting immediately (the Ace becomes 1 if needed). This makes soft hands more aggressive doubling opportunities.
These are weak soft hands. Only double when the dealer is at maximum bust risk (5 or 6). Otherwise hit to improve.
Slightly stronger — widen the double range to include dealer 4.
Soft 17 is a common mistake hand. You should never stand on soft 17 — it can only improve. Double against the dealer's weakest upcards; hit otherwise.
Soft 18 is a nuanced hand. Stand against dealers who are likely to land on 17 or 18. Double against weak dealers. Hit against strong dealers (9, 10, A) since 18 will often lose.
These are strong hands. Stand regardless of the dealer's upcard.
Aces split into two strong starting hands of 11. 8s split to escape the worst hand in Blackjack (hard 16). Split these unconditionally, against every dealer upcard.
A pair of 10s is 20 — one of the best hands you can have. Never break it. A pair of 5s is 10 — treat it as a hard 10 and double or hit, not split.
Against a weak dealer, two 9s outperform one 18. Against a dealer 7, your 18 is likely winning — don't split. Against 10 or Ace, stand.
Players sometimes avoid splitting Aces because they only receive one additional card per Ace in most Blackjack rules. Split them anyway. Two starting hands of 11 — each drawing one card — give you a far higher expected value than a soft 12. This is the most impactful split in the game.
Mistake 1: Standing on soft 17 because "17 is okay." Soft 17 is not a good hand and cannot bust on a draw. Always hit or double soft 17 — never stand.
Mistake 2: Splitting 10s because "two hands are better than one." 20 beats almost every dealer outcome. Breaking it into two hands starting at 10 each is a significant mistake.
Mistake 3: Taking Insurance. Insurance is a side bet that the dealer has Blackjack. The house edge on insurance is over 7% — far higher than the main game. Never take it.
Mistake 4: Playing by "feel" rather than the upcard. Hitting a hard 15 against a dealer 4 because you feel unlucky is giving away real advantage. Basic strategy is designed to maximise your expected outcome — not guarantee wins, but make the most of every hand mathematically.
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