Blackjack Rules and Key Terms
Blackjack is one of the world's best-known casino card games. The player and the dealer compete to get a card total as close to 21 as possible.
If your total goes over 21, you bust and lose the hand. You win if you finish with 21 or less and a higher total than the dealer, or if the dealer busts.
Blackjack Card Values
• 2–10: Worth their face value
• J, Q, K: All worth 10
• A (Ace): Worth 1 or 11
• Natural Blackjack: When your first two cards are an Ace and a 10-value card, for a total of 21
Basic Blackjack Actions
Blackjack gives you a range of actions to choose from, starting with Hit and Stand.
| Hit | Take an additional card. |
| Stand | Take no more cards and play the hand you have. |
| Double Down | Usually, you add a bet equal to your original wager and receive exactly one more card. |
| Split | Divide your hand into two separate hands when certain conditions are met, such as your first two cards being the same rank. |
| Surrender | Give up the hand. You usually get half your bet back. |
| Insurance | A side bet that may be offered when the dealer's upcard is an Ace. |
| Even Money | Lets you lock in a 1:1 payout under certain conditions, such as when you have a natural blackjack. |
| Push | A tie. Your bet is normally returned. |
| Bust | Your card total goes over 21 and you lose the hand. |
How to Play Blackjack: How a Round Works
In a standard game of blackjack, each player is dealt two cards to start.
You check your hand against the dealer's upcard, then choose from the actions available to you.
Once all players have finished their turns, the dealer plays out their hand according to fixed rules, and the results are settled.
Dealer Rules
The dealer doesn't make their own decisions. Usually they hit on 16 or less and stand on 17 or more. However, how soft 17 is handled varies from game to game.
What Is Blackjack Basic Strategy?
Basic strategy is a theory that mathematically compares the expected value (EV) of every action available to you in blackjack.
In 1956, Roger Baldwin and his colleagues published research on the optimal strategy for blackjack.
The theory calculates expected value based mainly on your hand and the dealer's upcard, adjusted for the specific rules of the game.
The Three Hand Types in Basic Strategy
In blackjack, each type of hand has different mathematical properties.
Hard Hand
A hand with no Ace, or one where counting the Ace as 11 would take you over 21.
Soft Hand
A hand where the Ace can be counted as 11 without going over 21.
Pair
A hand where your first two cards are the same rank.
What Is a Blackjack Strategy Chart?
A blackjack strategy chart is a grid with your hand on one axis and the dealer's upcard on the other.
For each combination, it shows the result of comparing the expected value of each available action, such as Hit, Stand, Double Down, Split and Surrender.
That said, the calculations change depending on the number of decks and the dealer rules, so no single chart works for every blackjack game.
The math behind basic strategy applies to online blackjack too. Unlike card counting, it doesn't require you to keep track of cards that have already been dealt.
How to Read a Blackjack Strategy Chart
A basic strategy chart compares the player's hand with the dealer's visible card. Each intersection represents a decision calculated under a specific set of blackjack rules.
| Chart Element | What It Means |
| Player's Hand | The player's card total, classified as a Hard Hand, Soft Hand, or Pair. |
| Dealer's Upcard | The dealer's visible card, ranging from 2 to Ace. |
| Chart Intersection | The mathematical comparison of available actions for that combination. |
| Game Rules | Deck count, dealer rules, and available actions affect the calculations. |
Why Is Blackjack RTP Often Quoted at Around 99%?
Blackjack is often described as having an RTP (Return to Player) of around 99%.
RTP is the theoretical percentage of all money wagered on a game that gets paid back to players over the long run. So if the RTP is 99%, the theoretical house edge is 1%.
RTP 99% = 1% House Edge
However, this figure doesn't apply to every blackjack game.
The RTP you usually see quoted assumes standard game rules and decisions made according to basic strategy.
The available actions, including Hit, Stand, Double Down, Split and Surrender, also factor into the expected value calculation.
In other words, to understand an RTP figure, you can't just look at the name of the game. You need to check the rules and player decisions that the calculation is based on.
Key Rules That Affect Blackjack RTP
- Number of decks used
- Payout for a natural blackjack (3:2, 6:5, etc.)
- Dealer rules on soft 17
- Restrictions on doubling down
- Splitting rules
- Whether surrender is available
- Settlement rules when the dealer has blackjack
For example, if the blackjack payout drops from 3:2 to 6:5, the theoretical RTP goes down even if every other rule stays the same.
Blackjack Pros and Cons
Good
• A game you can analyze mathematically
• Blackjack stands out because you can mathematically analyze the expected value of each action by combining player decisions with the game rules.
• There's a well-established theory called basic strategy, and the game is a great way to understand how RTP and house edge work.
Bad
• Rule variations can get complicated
• Even within blackjack, conditions change depending on the number of decks, payout ratios, and restrictions on doubling down and splitting.
• Also, even a mathematically optimal decision can't predict the outcome of any individual hand.
Final Verdict
• Blackjack is a casino game where the mathematical expected value depends not just on your card total, but also on your decisions and the game rules.
• Basic strategy analyzes those decisions in terms of probability and expected value, and it's a key concept for understanding blackjack RTP and house edge.
Online Blackjack and Card Counting
• Card counting is a mathematical technique that uses information from cards already revealed to estimate what's left in the shoe.
• Some live blackjack games offered by Evolution Gaming use eight decks and place a cut card approximately halfway through the shoe. Once the cut card appears, the cards are reshuffled after the current round is completed.
• With this setup, the information resets while plenty of cards are still left, which seriously limits how useful card counting can be.
Bonus: American vs. European Blackjack
Feature | American Style | European Style |
| Player's starting cards | 2 face up | 2 face up |
| Dealer's starting cards | 1 face up + 1 face down | 1 face up |
| Dealer's second card | Dealt at the start | After players finish their turns |
| Hole card (face down) | Yes | No |
In the American style, the dealer holds two cards from the start. In the European style, the dealer only receives their second card after the players have finished acting.
Because of this difference, the point at which a dealer blackjack is revealed, and how additional bets are settled, may also differ.
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