DA or DA2. Abbreviations for double down on any first two cards.
D'Alembert. A betting progression. It is a system where the bettor raises the bet one unit after each loss and lowers the bet one unit after each win. A series of numbers equidistant from one another is established, such as 1, 2, 3, 4. The player starts out by betting 1 unit. If he wins, he continues to bet one unit. If he loses, he cancels out the 1 and moves to the 2 and adds one unit to the last number, now having a series of 2, 3, 4, 5. At any point in the series where the player wins his bet, he reduces his bet by one unit. If he wins enough bets to return to a one unit bet, he starts over. If he loses during the series, he cancels out the last number he played and adds another number to the series. This system has many variations. It has never been proven to win, and in fact, cannot win in any game with a negative expectation.
DAS. An abbreviation for a rule that allows the player to double after splits. See double after split.
Day shift. Casino workers on day shift generally start at 10 AM, but may start a couple of hours earlier or later than that.
DD. 1. An abbreviation commonly used by posters to describe a double-deck game. 2. The acronym for double down.
DE. The acronym for double exposure, a variety of blackjack in which both dealer cards are dealt face up and ties lose.
Deal. The distribution of the cards to the players during the play of the game.
Dealer. The casino employee who distributes the cards to the players. A dealer can also include the stickman at the craps table, the croupier at a roulette table and anyone who deals cards in any card game offered in the casino.
Deck. 52 playing cards, the same as is used in poker. Commonly, blackjack players refer to a deck when discussing a single deck game. If a game uses more than one deck, but is still handheld by the dealer, such as a two deck game, the cards are often referred to as a pack.
Depth-charging. A method of play described by Arnold Snyder in his book Blackbelt in Blackjack, in which a player would either make flat bets or bet the table minimum on the first round of play after a shuffle and then raise his bets regardless of the count as play continues until the next shuffle. It is dependent upon the player seeing as many cards as possible, counting them using a counting system and making strategy variations based upon the count. In order to be successful, this method of play requires a count with a high playing efficiency and a deeply dealt single deck game.
Desirability Index. A term coined by Don Schlesinger in his book Blackjack Attack. It is a number derived by dividing the win rate by the standard deviation for the particular game being examined and multiplying the result by 100. The lowest desirability index number given in Schlesinger's book is -0.52 and the highest is 16.04. The higher the number, the better the game. In general terms, a player would look for a desirability index of 6.6 or higher to find game which would be considered to be playable to most counters.
Device. What you cannot use to play Blackjack in Nevada by law. Also in most other places, in the US and abroad. The definition of "device" has not been determined exactly through legal precedent but it has come to mean "computers" or any other calculating or note taking instrument that can be used by players. Casinos are using "devices" (ie computers) freely so far, in Nevada and elsewhere, to identify counting play, track customers, recognize faces etc.
DI. 1. The acronym for "desirability index".
Discards. The cards which have already been played since the last shuffle. They are placed by the dealer in a discard tray on the left side of the table from the player's perspective.
Discard tray. A plastic device used to hold the cards after they have been played. Discard trays may only be large enough to hold a single deck of cards or they may be large enough to hold as many as eight decks.
DOA. An abbreviation for double down on any first two cards.
Dollar. A colloquial term sometimes used in casinos to mean $100.
Doubling after splits. A rule which allows the player to double down after splitting a pair.
Double down. To double the size of one's initial bet before taking one more card. Usually, but not always, a player may only double down after receiving the first two cards. Occasionally, a casino may allow players to double down after receiving three or more cards. Once a player doubles down, the player may receive only one more card. Normally, the player places a bet equal to the size of the original bet next to the original bet in the betting square to let the dealer know he wishes to double down. If the player is playing in a game where the cards are held by the players, he places his cards face up in front of the betting square and the dealer places a third card either face-down under the player's bet or face up on the player's existing cards, usually at an angle opposite to the cards already in play. Most casinos allow players to double down for less money than the original wager, but never for more money than the original wager.
Double exposure. A game of blackjack in which the dealer is required to expose both of the cards originally dealt to him.
Downtown. The area of Las Vegas which begins north of Charleston Blvd. and continues to Stewart Avenue on the north. It is bounded by Main Street to the west and Maryland Parkway to the east. Some of the casinos considered to be downtown would include the Golden Nugget, Main Street Station, Fremont, and the El Cortez, to name a few.
Drop. The total amount of chips purchased at a table game by the players during a specific period of time, stated in dollar terms. A player may buy in $1000 but only wager $100 in total before cashing out. His buy-in was for $1000 which represents the Drop for the casino - while his Action was only $100, which represents the Handle for the casino. When cash is played at a table, the cash becomes part of the Handle, but is not included in the Drop unless it loses. Many casinos insist that cash is dropped before play so that these numbers aren't skewed. [See Action. See Drop. See Handle. See Win.]
Drop box. A box affixed to a playing table to store the money and markers exchanged at the table for chips.
DS. 1. See DAS. 2. The acronym for Don Schlesinger, author.
Dual-rate. A casino employee who is a dealer on some days and a floorperson on other days. The phrase comes from the fact that such an employee is paid at different rates depending on which job function is being performed.
Dumping table. A table where the dealer is losing frequently and the chip tray is constantly being refilled.
D10. An abbreviation for double down allowed only on ten or eleven. Variations: D8, D9, D11.