Second dealing (also known as dealing seconds) is a method of manipulating a deck of cards during a card game by way of dealing the second, rather than the top card of the deck, usually for the purpose of cheating. Second dealing and bottom dealing are also used in performance magic.
A card cheat who specializes in manipulating playing cards is called a card mechanic; a card mechanic who specializes in second dealing is called a "second dealer", a "deuce dealer", a "two dealer", or a "number two man."
Second dealing is only useful when the cheat knows the value of the top card of the deck. Once the value of the top card is known the cheat may resort to second dealing in order to avoid dealing a good card to an opponent, or to avoid dealing a bad card to himself (or to a secret accomplice).
In order to secretly gain knowledge of the value of the top card, second dealing is always used in conjunction with other cheating methods. One of the easiest, and most common methods of gaining knowledge of the top card is to employ the use of marked cards. When marked cards are not in use the cheat can still gain knowledge of the top card by means of peeking, flashing (to an accomplice; and receiving signals), or by employing the use of various mechanical devices that enable the cheat to see the value of the top card of the deck.
Second dealing is generally done by dealing the cards from the hand. While holding the deck in the hand, the dealer will either push the top card to the side - revealing a small portion of the back of the second card (called 'the brief'), and strike the second card instead (this method is known as the strike second deal), or by pushing two top cards as one, in almost perfect alignment, and peeling off the second card while pushing the top card back flush with the deck (this method is called the pushoff second deal). Both methods have some advantages and disadvantages, depending on the situation.
Second dealing can also be done when the cards are dealt from a dealing shoe, such as in many casino games. In this case the dealer will push the top card upwards and strike the partially exposed second card. Although this method is usually employed with the use of a gaffed dealing shoe, an expert card mechanic can do it with a regular dealing shoe as well.