Look up blackjack advice and you will meet big promises: systems that "beat the dealer", charts sold as secrets, videos claiming a sure profit. Basic strategy is none of those things. It is a set of decisions, worked out by computer, that names the least costly play for every hand you can hold against every card the dealer can show. Used consistently, it makes blackjack cheaper to play. It does not make it profitable. This explainer is for readers aged 18 and over.
Where basic strategy comes from
Every blackjack decision has a long-run average result. Holding hard 16 against a dealer 10, you can compare the outcomes of hitting, standing and, where allowed, surrendering across millions of simulated hands. One option loses the least on average. Repeat that exercise for every combination and you get a grid of answers. That grid is basic strategy. It is not an opinion or a feeling about "hot" shoes; it is arithmetic applied to the rules of the game.
Because the grid rests on the rules, the exact answers shift slightly with the number of decks, whether the dealer hits soft 17 and whether doubling after a split is allowed. A chart printed for the specific rule set you face is the safest reference.
The logic behind the chart
Most of the chart follows from one idea: the dealer's face-up card says a great deal about how likely the dealer is to bust. With a 4, 5 or 6 showing, the dealer often ends up drawing to a weak total and going over 21. With a 7 or higher showing, the dealer is more likely to finish on a solid total. So:
- Against a weak dealer card (2 to 6), the chart often lets the dealer carry the risk and tells you to stand on totals you might otherwise hit.
- Against a strong dealer card (7 to ace), the chart asks you to keep improving a stiff hand, even though that means busting some of the time.
A simplified view of the main decisions
| Your hand | Dealer shows 2–6 | Dealer shows 7–ace |
|---|---|---|
| Hard 8 or less | Hit | Hit |
| Hard 11 | Double | Double against 7 to 10; against an ace it depends on the rules |
| Hard 13–16 | Stand | Hit (surrender 16 against a 10 where allowed) |
| Hard 17 or more | Stand | Stand |
| Soft 20 or more | Stand | Stand |
This is a summary, not a full chart. Hard 12, hard 9 and 10, soft totals from 13 to 19 and most pairs each have their own row with small exceptions, and those exceptions are part of what keeps the cost down.
Pairs: four rules that rarely change
- Always split aces. Two aces together make an awkward 2 or 12; apart, each one starts a fresh hand with real promise.
- Always split eights. A pair of eights is 16, the weakest total in the game. Two hands that each start on 8 are a better position.
- Never split tens. Twenty is already a strong total. Breaking it up trades a likely win for two uncertain hands.
- Never split fives. Two fives make 10, a good total for doubling. Play them as one hand.
What basic strategy can and cannot do
Played faithfully at a table with good rules and a 3 to 2 blackjack payout, basic strategy brings the house edge down to roughly half a percent, a figure found in most standard references. That is low for a casino game, but it is still an edge in the casino's favour. Over a long run the expected result is a small, steady loss per hand, with plenty of short-term swings in both directions along the way.
Nothing on the chart changes the odds of the next card. It does not tell you when to raise your bets, and no betting progression stacked on top of it alters the long-run cost; doubling stakes after losses only makes the swings larger and the bad nights worse. Anything sold as a way around this deserves suspicion.
Myths the chart quietly corrects
- "Never bust." Standing on every stiff hand feels safe, but against strong dealer cards it costs more than hitting.
- "Assume the hole card is a ten." A handy shortcut, but the chart already weighs every possible hole card at its true frequency.
- "Take even money on a blackjack." Accepting even money when the dealer shows an ace works out the same as buying insurance, which the chart declines.
- "Bad players ruin the table." Another player's choices can change which cards you see in a single round, but not your expected result over time.
How to use it sensibly
- Find a chart that matches the rules of the game you plan to play.
- Practise with free-play versions or a deck of cards at home before any money is involved.
- Check the blackjack payout and the soft-17 rule before sitting down.
- Set a budget and a time limit, and stop at whichever comes first.
Many land-based casinos tolerate a small printed card at the table, but house policies vary, so ask first. If the game itself is new to you, start with our guide on how to play blackjack. And before playing for real money anywhere, check the rules where you live: age limits and the legality of online play are set locally and differ widely.
