Blackjack Basic Strategy: The Complete Chart Explained
Blackjack isn’t just a game of luck – every hand presents a decision, and there’s a mathematically correct answer for each one. Basic strategy is that set of answers: a chart telling you the statistically best move (hit, stand, split, or double) for every combination of your hand and the dealer’s upcard. It won’t turn the game in your favor, but under good rules it can bring the house edge down to around 0.5% – among the lowest of any casino game.
Where Basic Strategy Actually Came From
The math behind basic strategy was first worked out by four U.S. Army mathematicians – Roger Baldwin, Wilbert Cantey, Herbert Maisel, and James McDermott, known as the “Four Horsemen of Aberdeen” – who published their findings in 1956 using hand calculations. Edward Thorp refined and popularized the approach with computer analysis in his 1962 book Beat the Dealer, which also introduced card counting to the public. Later analysts, including Julian Braun and Peter Griffin, used more powerful computing to refine the charts further for different rule variations. Basic strategy still forms the foundation that card-counting systems are built on top of.
Hard Hands vs. Soft Hands
A hand with no ace, or one where the ace can only count as 1 without busting.
A hand containing an ace counted as 11, giving you extra flexibility since it can’t bust on the next card.
Basic Strategy Chart
These charts assume a common multi-deck ruleset (dealer stands on soft 17). Exact optimal play shifts slightly with different table rules, but this covers the vast majority of situations you’ll face.
Hard Hands (No Ace, or Ace Counted as 1)
| Your Hand | Dealer’s Upcard | Action |
|---|---|---|
| 5-8 | Any | Hit |
| 9 | 3-6 | Double (otherwise Hit) |
| 10 | 2-9 | Double (otherwise Hit) |
| 11 | 2-10 | Double (otherwise Hit vs. Ace) |
| 12 | 4-6 | Stand (otherwise Hit) |
| 13-16 | 2-6 | Stand (otherwise Hit) |
| 17-21 | Any | Stand |
Soft Hands (With an Ace Counted as 11)
| Your Hand | Dealer’s Upcard | Action |
|---|---|---|
| A-2 / A-3 | 5-6 | Double (otherwise Hit) |
| A-4 / A-5 | 4-6 | Double (otherwise Hit) |
| A-6 | 3-6 | Double (otherwise Hit) |
| A-7 | 3-6 | Double; Stand vs. 2, 7, 8; Hit vs. 9-A |
| A-8 / A-9 | Any | Stand |
Pairs
| Your Pair | Dealer’s Upcard | Action |
|---|---|---|
| A-A / 8-8 | Any | Split |
| 2-2 / 3-3 | 2-7 | Split (otherwise Hit) |
| 4-4 | 5-6 | Split (otherwise Hit) |
| 5-5 | 2-9 | Double as a hard 10 (otherwise Hit) |
| 6-6 | 2-6 | Split (otherwise Hit) |
| 7-7 | 2-7 | Split (otherwise Hit) |
| 9-9 | 2-6, 8-9 | Split; Stand vs. 7, 10-A |
| 10-10 | Any | Stand |
Applying the Chart Well
- Double on 11 against most dealer upcards – it’s one of the strongest, most reliable edges the chart gives you.
- Skip insurance – it’s a side bet with a high house edge on its own, regardless of your hand.
- Practice in free/demo mode first – get the chart into muscle memory before wagering real money.
- Avoid 6:5 blackjack tables – a natural blackjack paying 6:5 instead of the standard 3:2 meaningfully raises the house edge; it’s one of the most player-unfriendly rule changes to watch for.
- At a full table, you’ll see fewer hands per hour – it doesn’t change the house edge on any individual hand, but it does mean your bankroll moves through variance more slowly per hour of play.
What Basic Strategy Can and Can’t Do
Basic strategy minimizes the house edge – it does not eliminate it or guarantee profit. Even played perfectly, you’re still at a small statistical disadvantage on every hand; the chart just makes sure you’re not giving away more of an edge than necessary through bad decisions. Card counting is a separate skill built on top of basic strategy that tracks the deck’s remaining composition, and it carries its own legal and practical complications at real tables that are outside the scope of this guide.
Master the chart, play at tables with player-friendly rules (3:2 blackjack, dealer stands on soft 17, generous doubling/splitting rules), and treat basic strategy as a way to play more skillfully – not as a way to beat the game outright.
