Blackjack Rules — Splits, Doubles, Surrender & Dealer Variants

This is the complete rules reference for blackjack — every option, every dealer obligation, every variant that changes the odds. The goal of blackjack is straightforward: finish the hand with a higher total than the dealer without exceeding 21. If your total goes above 21, you bust and lose your stake immediately, regardless of what the dealer subsequently holds. If you beat the dealer’s total without busting, you win even money on your stake. Simple in concept, layered in execution — and that layering is what this guide covers in full.

Card values

Blackjack uses one or more standard 52-card decks. Each card carries a fixed point value:

• Number cards (2–10): worth their face value. A 7 is worth 7, a 4 is worth 4, and so on.
• Face cards (Jack, Queen, King): each worth 10 points.
• Ace: worth either 1 or 11, whichever is more favourable to the holder at the time.

Because the ace is flexible, blackjack hands fall into two categories:

• Hard hand: a hand that contains no ace, or one where the ace must be counted as 1 to avoid busting. Example: 9 + 7 = 16 (hard 16). Or: ace + 9 + 8 = 18, where the ace must count as 1 (hard 18).
• Soft hand: a hand that contains an ace currently counted as 11, meaning you cannot bust on the next card. Example: ace + 6 = soft 17. Drawing a 10 gives you ace + 6 + 10 = 17, with the ace dropping to 1 — still a valid hand.

This distinction matters because the dealer’s rules treat soft and hard totals differently, and basic strategy recommends different plays for soft versus hard totals of the same number.

How a hand is played

A standard blackjack hand follows this sequence:

1. All players place their bets before any cards are dealt.
2. The dealer deals two cards to each player, face up, and two cards to themselves — one face up (the upcard) and one face down (the hole card).
3. If the dealer’s upcard is an ace, players are offered insurance before play continues (covered below).
4. If the dealer’s upcard is a 10-value card or an ace, the dealer checks the hole card for blackjack. If the dealer has blackjack, the round ends immediately.
5. Each player acts on their hand in turn, choosing from the options described in the next section.
6. Once all players have completed their hands, the dealer reveals the hole card and plays out their hand according to fixed rules.
7. Hands are settled: wins pay even money (1:1), a player blackjack pays 3:2, busted hands lose, and ties (pushes) return the original stake.

Blackjack (natural): a two-card hand totalling 21 — an ace plus any 10-value card. This is the best possible hand and typically pays 3:2 on the original stake. If both the player and the dealer hold blackjack, the hand is a push.

Push: a tie between player and dealer. Neither wins; the stake is returned.

Bust: any hand exceeding 21. A player who busts loses their stake immediately, before the dealer reveals the hole card.

Player options explained

After receiving their initial two cards, each player has up to five options. Not all options are available on every hand or at every table.

Hit

Take one additional card from the dealer. You may hit as many times as you choose, as long as your total remains below 21. Hitting is automatic if you reach exactly 21 — the hand is complete. If you exceed 21, you bust.

Signal at a physical table: tap the felt with a finger, or wave toward yourself.

Stand

Take no more cards. Your total is final. The dealer will then proceed to the next player or reveal the hole card.

Signal at a physical table: wave your hand horizontally, palm down, over the cards.

Double down

Double your original bet and receive exactly one more card — no more, no less. This is the most powerful offensive option in blackjack, and it is most advantageous when your initial two cards total 10 or 11, because a 10-value card (the most common in the deck) will give you a strong total of 20 or 21.

Some casinos restrict doubling to totals of 9, 10, and 11 only. Others allow doubling on any two-card total. Doubling after a split (DAS) is a separate rule, covered under variants below.

Signal at a physical table: place an additional chip stack beside (not on top of) the original bet.

Split

If your first two cards are of the same value — two 8s, two 7s, two aces, a Jack and a King (both worth 10), and so on — you may split them into two separate hands. You place an additional stake equal to your original bet, and each card becomes the first card of an independent hand. The dealer then deals a second card to each hand, and you play them out individually.

Key points about splitting:

• Aces: most casinos allow only one additional card on each split ace, with no option to hit again. This limits the hand but the potential for two strong totals makes splitting aces correct in virtually every situation.
• 10-value pairs: splitting a pair of 10s is almost always mathematically incorrect, because a total of 20 is already very strong.
• Resplitting: if you split and one of the new hands immediately forms another pair, some tables allow you to split again (resplit). The number of permitted resplits varies by table rules.

Signal at a physical table: place the additional chip beside the original bet and hold up two fingers to indicate a split, not a double.

Surrender

Forfeit your hand and recover half your original stake. This option is not available at all tables, and where it is offered it comes in two forms:

• Late surrender: available after the dealer has checked for blackjack. If the dealer has blackjack, surrender is not available — you simply lose. This is by far the more common form.
• Early surrender: available before the dealer checks for blackjack. Because you can surrender even when the dealer ultimately holds blackjack, early surrender is significantly more valuable to the player. It is rare in modern casinos.

Basic strategy indicates surrender (late) on a hard 16 against a dealer 9, 10, or ace, and on a hard 15 against a dealer 10, in most common rule configurations.

Signal at a physical table: draw a line behind your bet with your index finger while saying “surrender.”

The dealer’s rules

The dealer operates under strictly fixed rules and makes no independent decisions. There is no bluffing, no tactical adjustment — only mandatory actions:

• If the dealer’s total is 16 or lower, the dealer must take another card.
• If the dealer’s total is hard 18 or higher, the dealer must stand.
• The treatment of soft 17 depends on the table rules in force:

S17 — stand on soft 17: the dealer stands on all totals of 17, including soft 17 (for example, ace + 6). This rule is more favourable for the player, as it limits the dealer’s opportunity to improve a weak holding.

H17 — hit soft 17: the dealer must take an additional card on soft 17. This rule increases the house edge by approximately 0.2 percentage points compared to S17. When choosing a table, S17 is preferable.

The dealer never doubles down, never splits, and never surrenders. The hole card is revealed only after all players have completed their hands. If the dealer busts, all players who have not already busted win automatically at even money.

Insurance

When the dealer’s upcard is an ace, the casino offers insurance before play continues. Insurance is a separate side wager of up to half your original stake. If the dealer’s hole card is a 10-value card — completing a blackjack — insurance pays 2:1, effectively cancelling the loss on the main hand. If the dealer does not have blackjack, the insurance bet is lost and play continues normally.

The mathematics are straightforward. In a standard six-deck game, roughly 30.7% of remaining cards are 10-value cards. The insurance bet pays 2:1, meaning the break-even probability would be 33.3%. Because the actual probability of the dealer holding a 10 is lower than that, the house edge on insurance runs to approximately 7.5% — making it one of the worst bets at the blackjack table.

Basic strategy recommendation: decline insurance in virtually all circumstances. The only exception is if you are counting cards and the running count indicates an unusually high proportion of 10-value cards remaining in the shoe.

“Even money” — the offer to take 1:1 immediately when you hold a blackjack and the dealer shows an ace — is mathematically identical to taking insurance on that hand. The same recommendation applies: decline.

Common rule variants

The rules above describe the standard game, but specific rule configurations vary considerably between casinos and tables. These are the variants that most affect the player’s expected return:

Number of decks: blackjack can be played with 1, 2, 4, 6, or 8 decks shuffled together in a shoe. Fewer decks reduce the house edge, all other rules being equal. A single-deck game with otherwise identical rules has a house edge roughly 0.5–0.6 percentage points lower than an eight-deck game.

Blackjack payout — 3:2 versus 6:5: the standard payout for a natural blackjack is 3:2 (a $10 bet wins $15). Some tables — particularly at lower-denomination games in tourist-facing casinos — pay only 6:5 (a $10 bet wins $12). This single rule change adds approximately 1.4 percentage points to the house edge. Always choose a 3:2 table. If only 6:5 tables are available, consider a different game.

Double after split (DAS): whether the casino permits you to double down on a hand formed after splitting a pair. DAS reduces the house edge by roughly 0.14 percentage points and is worth seeking out.

Resplitting aces: if splitting aces is allowed and one of the resulting hands forms another pair of aces, some tables allow you to split again. The option to resplit aces (RSA) lowers the house edge slightly.

Early versus late surrender: as described above, early surrender is significantly more valuable to the player and is rarely offered. Late surrender, which is more common, still has value when used according to basic strategy.

European no-hole-card rule: in many European casinos, the dealer does not take a hole card until after all players have acted. This means that if the dealer ultimately reveals blackjack, the player loses not only their original bet but also any additional stakes placed through doubling or splitting. This rule increases the house edge by approximately 0.11 percentage points and changes certain basic strategy decisions.

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Now that you have the rules down, the logical next step is to learn how to play every hand optimally. Read Blackjack Basic Strategy for the complete strategy charts, or head straight to play blackjack for free and put the rules into practice.