# The Numbers of 21

THE ENCYCLOPEDIA OF CASINO TWENTY-ONE

1. One of two values for the ace as declared by the player. If an ace is removed from a single-deck Las Vegas Strip (LVS) rule game it puts the player at a -.61% disadvantage.  See 11.

1:x. Abbreviation for a bet spread of 1 to x, where x can be any number. (e.g., 1:10, 1:8, 1:4, 1:2)

1 deck. See single-deck.

2. A low card which, if removed from a single-deck LVS rule game gives the player a +.38% advantage.

2.7. The average number of cards that are used in a blackjack hand.

2-6. A stiff card. When the dealer has one of these up-cards the dealer has what is referred to as a potentially stiff hand.

2:1. Abbreviation for a blackjack game in which naturals pay 2 to 1 instead of the normal 3 to 2.

2 deck. (2D) See two deck.

21e. Acronym for naturals pay even money instead of 3 to 2.

21l. Acronym for dealer blackjack beats player blackjack.

21p. Acronym for dealer’s blackjack with 10 up pushes player’s 21.

21w. Acronym for blackjack wins regardless of dealer’s hand.

3. A low card which, if removed from a single-deck LVS rule game, gives the player a +.45% advantage.

3:2. Abbreviation for a blackjack game in which naturals pay off the normal 3 to 2.  In other words, a \$10 wager will win \$15 if the player receives a natural and the dealer does not also have a natural 21.  See 6:5.

3 deck. (3D) See three deck.

3up. Acronym for play one hand against 3 dealer upcards.

4. A low card which, if removed from a single-deck LVS rule game gives the player a +.55% advantage.

4 deck. (4D) See four deck.

5. 1) A low card unique in the sense that it can convert all stiff hands into pat hands. It is the most valuable card for the dealer. If removed from a single-deck LVS rule game it gives the player a +.69% advantage. 2) Acronym for Five Card 21 pays 2 to 1.
[2) Wong Current Blackjack News]

5 deck. (5D) See five deck.

6. 1) A low card which, if removed from a single-deck LVS rule game gives the player a +.46% advantage. 2) Acronym for six card unbusted hand wins automatically.
[2) Wong Current Blackjack News]

 WARNING: DANGER AHEAD Don’t play casino twenty-one when the dealer only pays 6 to 5 on a blackjack!   Unless, of course, you can see the dealer’s hole-card.

6:5.   Abbreviation for a blackjack game in which naturals pay off at 6 to 5. In other words, a \$10 wager will win only \$12 if the player receives a natural and the dealer does not also have a natural 21.  House edge for a typical single deck game with the 6:5 rule is about 1.45%*, compared with 0.18% for a typical single deck game with the normal 3:2 rule.   This is a definitely a rule all players should avoid and protest.  See 3:2. * Note: In some 6:5 single deck games, a player’s natural wins regardless of what the dealer has — which reduces the house edge in the game slightly to 1.24%.

6 deck. (6D) See six deck.

7. A card that can be considered a low card or a neutral card. If removed from a single-deck LVS rule game it gives the player a +.28% advantage.

8. The most neutral of all cards which, if removed from a deck has little or no effect on advantage.

8 deck. (8D) See eight deck.

9. A card which, if removed from a single-deck LVS rule game puts the player at a 0.18% disadvantage.

10. A ten valued card which can be a ten, jack, queen, or king. There are 16 ten valued cards in a deck of cards. A card which, if removed from a single-deck LVS rule game puts the player at a 0.51% disadvantage. See ten.

11. One of two values for the ace as declared by the player. See 1.

12-16. A stiff or potentially breaking hand.

14 Count. See Revere 1973 APC.

17-21. A pat or potentially winning hand.

21. The best sum of card values a player can obtain. This value is called a blackjack if it is from the player’s original two cards (ten valued card plus an ace).

21. Surprisingly, we should also be receiving a blackjack every 21 hands (or so).

21e. Acronym for naturals pay even money instead of 3 to 2.
[Wong Current Blackjack News]

21l. Acronym for dealer blackjack beats player blackjack.
[Wong Current Blackjack News]

21p. Acronym for dealer blackjack with 10 up pushes player’s 21.
[Wong Current Blackjack News]

21w. Acronym for blackjack wins regardless of dealer’s hand.
[Wong Current Blackjack News]

21+3. Reference to a blackjack sidebet.  Several variations exist.  Based on the player’s first two cards “and” the dealer’s up card.  You win this bet if the 3 cards equal a flush, straight, straight flush, or three of a kind.

22-31. A busted hand.

52. The number of cards in a standard deck of playing cards, excluding jokers.

86’d. Abbreviation for being kicked out of a casino and usually with a threat of being arrested if you return.

6-7-8. A popular bonus hand in social blackjack games and in some casinos. Some casinos have experimented with paying players a bonus if they receive this hand suited but only if they win the hand. In other words, the player does not receive the bonus if he ties the dealer or the dealer turns up a natural. Typically, any 6-7-8 pays double or there is a bonus for this hand.  See Royal 21. See 7-7-7. See A-J bonus.
[9/92 Schlesinger Lost in the Maze..BJF] [92 Wong Basic Blackjack]

7-7-7. A Royal 21. A popular bonus hand in social blackjack games and in some casinos. Typically, any 7-7-7 pays double or there is a bonus for this hand.  See 6-7-8. See A-J bonus.
[9/92 Schlesinger Lost in the Maze.. BJF] [92 Wong Basic Blackjack]

5-5-5-5. A bonus hand offered in some casinos. Typical payoff was 2 to 1.
[92 Wong Basic Blackjack]

 The two exotic rule options above have appeared in the casinos in the following formats: Winning 6-7-8 suited pays 2 to 1 Winning 7-7-7 suited pays 3 to 2 In each case above the advantage to the player is small (PA = +0.01%). According to Stanford Wong’s Blackjack Analyzer software the only basic strategy change is for the 6-7-8 case where it is correct to hit 6-7 suited versus a dealer 2. [9/92 Schlesinger Lost in the Maze.. BJF]

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