Blackjack rules and table types

Start with the physical game, because the rules are the container everything else lives in.

Walk into almost any UK licensed casino in 2026 and you'll find blackjack dealt from a six-deck shoe. The cards come face-up in front of you; the dealer takes one face-up and one face-down. You don't touch your cards. This is not the American single-deck hand-held game you might have encountered in a Las Vegas biography or a 1970s paperback about card counting. The UK shoe game is a different proposition, and the rules that govern it are worth reading in full before you place your first chip.

The objective is the same everywhere: get closer to 21 than the dealer without going over, or let the dealer bust. Aces count as 1 or 11. Tens, jacks, queens, and kings all count as 10. Every other card counts at face value. A two-card total of 21 (an ace plus any ten-value card) is a natural blackjack and pays 3:2 at a properly structured table. If the dealer also holds a natural, the hand is a push and your stake is returned. These are the constants. Everything else varies by venue and by game variant, and the variations matter more than most players realise.

Dealer Rules: S17, H17, and Why the Difference Is Not Trivial

The single most important rule you'll find printed on the felt, or posted on the table placard, is the dealer's standing rule on soft 17.

A soft 17 is any hand containing an ace counted as 11 that totals 17: ace-6, ace-3-3, ace-2-4, and so on. Under S17 rules, the dealer stands on all 17s, hard or soft. Under H17 rules, the dealer must hit soft 17. That distinction produces a measurable difference in house edge. the H17 effect calculates at approximately 0.20% added to the house edge on a six-deck game, all else being equal. Over a typical session of 50 hands per hour, that's a real cost.

Most UK casinos run S17 as the default, which is the more favourable dealer rule for the player. The Hippodrome on Leicester Square, for instance, runs standard six-deck S17 blackjack on its main floor. When you encounter an H17 game, you're sitting at a materially more expensive table, and your basic strategy chart changes for a handful of hands (double-down and surrender decisions on certain totals shift when the dealer is more likely to improve from soft 17).

The practical check: look at the table placard before you sit. It should say "Dealer must stand on all 17s" or "Dealer hits soft 17." If there's no placard and the floor manager can't tell you, ask the pit boss. The answer matters.

Bet Behind, BB1A, and the BB+1 Variant

UK casinos, particularly those with busy floors and limited seating, often allow non-seated players to wager on a seated player's hand. This is called Bet Behind, and it comes in two principal forms.

Bet Behind All (BB1A) is the standard version: you place a chip in the Bet Behind circle behind any occupied seat, and your outcome mirrors that player's hand exactly. You win when they win, lose when they lose, push when they push. You have no input on the playing decision; the seated player controls the hand. This is an entirely passive position, which means you're entirely dependent on whether the seated player is following basic strategy or doing something idiosyncratic with the cards.

BB+1 is an extension of the same concept that allows a supplementary wager: you place a standard Bet Behind stake and an additional Bet+1 chip in a designated circle. The BB+1 element pays at a higher rate if the seated player's hand achieves a specific outcome, most commonly an unbeaten 21 or a double-down win, giving it something of a side-bet character. The precise structure varies by venue and table software, so read the table rules before treating BB+1 as anything other than a conventional Bet Behind with a bonus element.

From a strategic standpoint, Bet Behind on a player you know to be following basic strategy is broadly equivalent to playing the hand yourself, edge-adjusted for the shoe penetration. Bet Behind on a player who hits hard 15 against a dealer 6 is not. Choose your box accordingly.

Splitting, Doubling, and Surrender: The UK Standard

The UK six-deck shoe game typically offers the following playing options, though specific venues vary:

You can split any pair, including aces. Most UK games allow re-splitting pairs (RSP), meaning if you split a pair and receive a matching card, you can split again up to a maximum of three or four hands. Split aces, however, almost always receive only one card each and cannot be re-split; this is a standard restriction and reduces the value of splitting aces slightly compared to the theoretical maximum. A blackjack after splitting aces usually pays even money rather than 3:2, again a modest reduction to your return.

Double down is usually available on any two-card total, which is the player-favourable rule (some games restrict doubling to hard 9-11 only). Double after split (DAS) is available at most UK venues; it allows you to double down on the hand you receive after splitting a pair, which is a useful option in specific situations the basic strategy chart maps precisely.

Late surrender is available at some UK venues and is worth looking for. Under late surrender, you can forfeit your hand and recover half your stake after the dealer has checked for blackjack. the late-surrender value is at approximately 0.07-0.08% off the house edge in a six-deck S17 game, which is meaningful at the margins. The Hippodrome's table games section lists its current game variants; check before visiting.

Insurance is offered when the dealer shows an ace. It pays 2:1 if the dealer has a blackjack, and costs half your original bet. In a six-deck game, the probability of the dealer holding a ten-value card under that ace is roughly 30.8% (96 ten-value cards in 312, minus any you can see). At 2:1, the break-even probability is 33.3%. Insurance is a losing bet at nearly all times. The one exception is when you're counting cards and know the remaining deck is ten-rich: see the card counting lesson for that conversation.

The Rule Set That Defines UK Play

Putting it together: the standard UK casino blackjack game you'll encounter at Aspers Westfield Stratford, the Hippodrome, or any major London floor is roughly this configuration: six decks, S17, double on any two cards, DAS, no late surrender by default, 3:2 blackjack, dealer checks for blackjack under ace or ten. That rule set, played with correct basic strategy, produces a house edge in the range of 0.40-0.60%.

Deviations from that baseline always make the game more expensive for the player, not less. A 6:5 blackjack payout (increasingly common on lower-minimum tables at busy tourist venues) adds approximately 1.39% to the house edge. our analysis breaks down every rule variation and its effect, and the lesson on table selection applies those numbers to specific London venues. The blackjack trainer at tools/blackjack-trainer/ lets you practise under the exact rule set you'll face, which is how you make the chart automatic before you sit down in a real room.

Key numbers

Sources: our in-house edge analysis, UK Gambling Commission general betting rules, Hippodrome Casino table games.