When a dealer shows an ace or a ten-value card, many tables pause before anyone plays. The dealer looks at the hole card, face down on the felt, to see whether it makes a natural. This is the peek. If the dealer has blackjack, the hand ends on the spot. If not, play carries on as normal, and every player now knows the dealer does not have a natural.
When the dealer peeks, and when not
Only two up-cards can make a blackjack: an ace (with a ten underneath) or a ten-value card (with an ace underneath). Tens, jacks, queens and kings all count. With a 2 through 9 showing, the dealer cannot have a natural, so there is nothing to check.
In a six-deck shoe of 312 cards there are 24 aces and 96 ten-value cards. That makes 120 cards out of 312 that call for a peek, which is 5 in 13, or 38.46% of hands. The order of events at a table with a peek runs like this:
- Cards are dealt: two to you, one up and one down for the dealer.
- If the up-card is an ace, insurance is offered first.
- The dealer checks the hole card. With a ten-value up-card there is no insurance, and the check comes straight away.
- A natural is turned over and the hand is settled. Otherwise you play your hand.
Insurance comes before the check on purpose. It is a bet on what the hole card is, so it has to be placed while the card is still unknown. For the maths behind it, see why insurance loses unless you are counting.
How often the peek finds a natural
The odds follow directly from what is left in the shoe. Take a fresh six-deck shoe and a dealer's up-card that is an ace. The hole card comes from the other 311 cards, and 96 of them are tens:
96 / 311 = 30.87%
With a ten-value card up, the hole card has to be one of the 24 aces among the other 311:
24 / 311 = 7.72%
These count only the dealer's own card. Your two cards and any others on the table change the real figure a little. The ace figure is four times the ten figure, because there are four times as many tens as aces.
Combine the two and a dealer natural comes up on 2 × (24/312) × (96/311) = 4.75% of hands, about one in 21. Spread over the 38.46% of hands where the dealer peeks, that is 12.3%: the peek finds a natural roughly once in every eight looks. On the other seven, it removes the dealer's natural from the list of things that can happen to you.
What the peek saves you
The peek matters most for the moves that add chips to the table. Suppose you hold 11 and double down on a 10-chip bet, putting 20 chips in play.
- With a peek, a dealer natural is found before you double. You lose your original 10 chips and nothing more.
- Without a peek, some games let you double, split or raise first. If the hole card then turns out to give the dealer a natural, all 20 chips are lost.
Games with no hole card, common in parts of Europe, work this way, and some of them soften it with an “original bet only” rule, where a dealer natural takes just the first bet and returns the extra chips from a double or split. Where the rule is not in force, the cost of that extra exposure is one more bet on each hand where the dealer turns out to have a natural. Take the 10-chip double above:
- Dealer ace up: 30.87% × 10 = about 3.09 extra chips lost per double.
- Dealer ten-value up: 7.72% × 10 = about 0.77 extra chips lost per double.
Those are the figures for the doubles you make against those up-cards. With a peek, both are zero, which is why the rule is worth having and why basic-strategy charts differ between peek and no-peek games. Against an ace or a ten, the no-peek version asks you to double and split less.
What a peek tells you
A peek also gives information, even when it finds nothing. If the dealer shows an ace and the game goes on, the hole card is not a ten-value card. If the dealer shows a ten and the game goes on, it is not an ace. That is useful in two small ways:
- The dealer's total is now one that can still change: an ace up with a non-ten underneath is a soft hand, and a ten up with no ace underneath is a hard 12 to 20.
- Surrender comes after the check. In a late-surrender game, you decide knowing the dealer does not have a natural. The odds of a dealer bust from each up-card are listed in how often the dealer busts.
One thing the peek does not change is a natural of your own. If you hold blackjack and the dealer does too, the hand is a push, and you keep your bet. A natural against a dealer natural pays nothing and loses nothing. The value of an uncontested natural is covered in why 3:2 matters more than any other rule.
Checking the peek in practice
When you sit down at any blackjack table, find out whether the dealer takes a hole card and whether the game checks for a natural before you act. The rules printed on the felt or in the help screen will say. The answer changes how safely you can double against an ace or a ten. Blackjack 21 Big Cards Offline pays blackjack at 3:2, with a six-deck shoe and the dealer standing on 17, and it offers hit, stand, double down, split, surrender and insurance. The figures above are for a fresh six-deck shoe, so they describe the start of a shoe, not a particular hand.
Blackjack 21 Big Cards Offline seats you with four other players and the dealer at a five-seat table, and the best hand sweeps every chip the losers left behind. It plays offline, the chips are free every day, and they have no cash value.