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♠ Play the odds, not the hunch

Making the mathematically sound blackjack decision

Blackjack strategy is about choosing the play with the best long-run expectation for the exact hand in front of you. It will not win every round — nothing can — but it keeps the house edge as small as the table rules allow. Below are the core decisions, a full reference chart, and the mistakes worth avoiding.

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What strategy means — and what it does not

“Basic strategy” is a worked-out set of best decisions for every combination of your total and the dealer’s upcard. It comes from running the maths on how each choice performs over millions of hands, then picking the one that loses the least or wins the most on average.

What it is not is a guarantee. Strategy lowers the house edge; it does not erase it. You can play every hand perfectly and still lose a session, because each round is decided by cards you cannot control. Anyone promising a system that removes risk or promises profit is misleading you. Treat strategy as a way to give yourself the best available odds, not a way to beat the game outright.

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♣ The four choices

Hit, stand, double and split

♠

Hit

Take another card to improve a low total. You can keep hitting until you stand or bust past 21.

♥

Stand

Hold your current total and pass the action to the dealer. Best when drawing risks busting a strong hand.

♦

Double down

Double your stake for exactly one more card. Used when you hold a strong starting total against a weak dealer upcard.

♣

Split

Turn a matching pair into two separate hands, each with its own stake. Strongest with aces and eights.

Why the dealer’s upcard drives every decision

Your own total is only half the picture. The dealer’s single face-up card is the strongest clue to how their hand will finish, and it shapes what you should do.

Upcards of 2 through 6 are “weak” — the dealer is more likely to be forced into a draw that busts, so you can afford to stand on modest totals and let them take the risk. Upcards of 7 through ace are “strong,” because the dealer will often reach a solid total, so you usually need to keep improving your own hand. The same 16 in your hand is a stand against a 6 and a hit against a 10, purely because of what the dealer is showing.

Hard hands, soft hands and pairs

Strategy splits your possible hands into three groups because each behaves differently:

  • Hard hands have no ace, or an ace that must count as 1. They can bust on the next card, so the decision balances improving against the risk of going over.
  • Soft hands contain an ace counted as 11. They cannot bust on a single draw, which makes them ideal for aggressive hitting and doubling.
  • Pairs give you the extra option to split. Whether that is worthwhile depends on the pair and the dealer’s upcard.

♠ Reference

Basic strategy chart

Read your hand down the left, the dealer’s upcard across the top, and take the action in the cell. This chart assumes a common multi-deck game where the dealer stands on soft 17 and doubling after splitting is allowed.

Rules change the right answer. The correct decision can vary with the exact rules of the table — number of decks, whether the dealer hits soft 17, doubling and surrender rules, and the blackjack payout. Match the chart to the table you are actually playing.

H = Hit S = Stand D = Double (hit if not allowed) P = Split
Hard totals — your total vs dealer upcard
Your hand2345678910A
8HHHHHHHHHH
9HDDDDHHHHH
10DDDDDDDDHH
11DDDDDDDDDH
12HHSSSHHHHH
13SSSSSHHHHH
14SSSSSHHHHH
15SSSSSHHHHH
16SSSSSHHHHH
17+SSSSSSSSSS
Soft totals (hand with an ace as 11) vs dealer upcard
Your hand2345678910A
A,2HHHDDHHHHH
A,3HHHDDHHHHH
A,4HHDDDHHHHH
A,5HHDDDHHHHH
A,6HDDDDHHHHH
A,7SDDDDSSHHH
A,8+SSSSSSSSSS
Pairs — whether to split vs dealer upcard
Your pair2345678910A
A,APPPPPPPPPP
10,10SSSSSSSSSS
9,9PPPPPSPPSS
8,8PPPPPPPPPP
7,7PPPPPPHHHH
6,6PPPPPHHHHH
5,5DDDDDDDDHH
4,4HHHPPHHHHH
3,3PPPPPPHHHH
2,2PPPPPPHHHH

Note: 5,5 is never split — play it as a hard 10. A,8 and higher soft totals stand. These are general defaults for the rule set above.

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♥ Quick reference

The short version for your phone

If in doubt

  • Always split aces and eights.
  • Never split tens or fives.
  • Stand on hard 17 or more.
  • Hit hard 8 or less every time.

Against the dealer

  • Dealer 2–6: lean toward standing and doubling.
  • Dealer 7–ace: keep improving your hand.
  • Double a hard 11 versus almost anything.
  • Decline insurance as a routine play.

Planning a bankroll in CA$

Strategy only helps if your money lasts long enough to play sensibly. Decide on a session bankroll you are comfortable losing entirely, then size your bets so a normal run of bad hands does not end things in a few minutes.

A common guideline is a base bet of roughly 1–2% of your session bankroll. On a CA$100 bankroll that is about a CA$1–CA$2 base bet, which leaves room for the ups and downs of the game and the occasional double or split. On CA$250, a base bet near CA$2.50–CA$5 follows the same logic. These are illustrations, not targets — the right number is whatever keeps you within a budget you have set in advance.

Set the limit before you play, not during. Chasing losses by raising stakes is the fastest way to turn entertainment into a problem, and no betting pattern changes the underlying odds of the next hand.

♣ Avoid these

Common strategy mistakes

Taking insurance

Insurance is a side bet that loses money over time for a basic-strategy player. Skipping it is the standard play.

Standing on soft 17

A soft 17 cannot bust on one card, so hitting or doubling usually beats holding. Many players stand out of habit.

Splitting tens

Two tens is already a 20 — one of the strongest hands. Breaking it up trades a near-certain strong total for two weaker ones.

Mimicking the dealer

Always drawing to 17 ignores the dealer’s upcard and gives up the flexibility that makes your position better than theirs.

Chasing losses

Raising stakes to recover a loss does not change the odds and can drain a bankroll quickly.

Ignoring the table rules

Using a chart that does not match the table — wrong deck count or soft-17 rule — leads to small but steady errors.

Why the table rules change the correct play

A basic-strategy chart is built for a specific rule set. Change the rules and a few cells shift. If the dealer hits soft 17 instead of standing, the house edge rises and a handful of doubling and standing decisions change. Fewer decks, restrictions on doubling after a split, and whether surrender is offered all nudge the maths as well.

The blackjack payout matters most of all for your bottom line: a table paying 3:2 on a natural is meaningfully better than one paying 6:5, even with identical strategy. Before you sit down, read the table’s rules — the blackjack rules guide explains each of these so you can spot the differences.

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Strategy is not a safety net

Even flawless basic strategy leaves the house with an edge, and every hand can still go against you. Strategy is a way to play smarter, not a way to make blackjack risk-free or profitable. Set a budget, keep sessions short, and stop when you reach your limit.

Gambling is for adults of legal age in your province or territory (18 or 19+) and carries real financial risk. If it stops being fun, free and confidential help is available through provincial services such as ConnexOntario. This page is educational and is not financial advice.

♠ Questions

Blackjack strategy FAQ

It is the set of mathematically best decisions for every combination of your hand and the dealer’s upcard. Following it consistently keeps the house edge as low as the table rules allow.

No. Basic strategy reduces the long-run house edge but never removes it, and it cannot guarantee any single hand or session. Blackjack always involves real financial risk.

Because the best play depends on details like whether the dealer hits or stands on soft 17, the number of decks, doubling and surrender rules, and the blackjack payout. A chart made for one rule set can be slightly wrong for another, so always match it to the table.

For a basic-strategy player, insurance loses money over time and is not recommended as a routine play. The standard advice is to decline it.

Learn the rules that shape every decision

Strategy and rules go hand in hand. See exactly how dealer draw rules, soft 17 and payouts work on the blackjack rules page, then apply the BOOST20 code when you are ready to play.

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