When the dealer is dealt an ace or 10 upcard and manually checks the hole card to determine if the hand is a natural. Note: Today many casinos use special “auto peek” devices built into the table, which automatically read 10s or aces, as appropriate, from those cards that are specially coded. With such devices, dealers no longer manually peek at the hole card.
this is when the dealer is dealt an ace or 10 upcard and usually checks the hole card to determine whether the hand is a natural.
The dealer checks to see if he has Blackjack before the player's start taking hits. This is good for the player because it prevents you from splitting and doubling down, increasing your bet only to find the dealer has Blackjack. Variations to the Peek rule are whether the dealer checks for Blackjack with an Ace showing, or sometimes an Ace or Ten.