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Craps (previously known as crabs) is a popular casino gambling game using dice. Players wager money against the casino on the outcome of one roll, or of a series of rolls of the dice. The rules vary slightly from one casino to another, but the expected value of most bets is only slightly negative (the most favorable bets with the most favorable rules offer a house advantage of as little as 0.18%). All bets have negative expectations, and there is no correlation between die rolls, so there is no possible winning strategy over any given period of time. While experienced poker players, and blackjack players who learn to count cards can gain a small mathematical advantage over extended playing sessions by diligent study, there is no comparable strategy for craps.

Occasionally, players win several bets in a row, and such players are said to be "on a roll." Those who increase their bets during a winning series can rapidly win substantial sums. On the other hand, money can be lost back just as quickly, as there is no statistical likelihood of a "hot streak" continuing for any given duration. To counter this, experienced players take full advantage of "free odds" -- bets on which there is zero house advantage.

Craps can also be played in less formal settings and is said to be popular among soldiers. In such situations side bets are less frequent, and one or several participants make "covering" bets against the dice.

1 The basic game

The basic game of craps is very simple. On the first roll of the two dice (the come-out roll), the shooter wins by rolling either a 7 or 11 (a natural). Rolling craps (2, 3, or 12) loses. Any other number (4, 5, 6, 8, 9, or 10) is called the point. To win, the point number must be rolled before a 7. Winning is also known as passing. If a 7 is rolled before the point number, the shooter has sevened-out and loses. The shooter relinquishes the right to shoot when he or she sevens out, and the player to the left shoots next. For clarity, the number 11 is refered to as "yo" so as not to be confused with the number 7.

A casino craps table is run by four casino employees, a boxman who guards the chips; two dealers who stand to either side of the boxman and collect and pay bets; and a stickman who stands directly across the table from the boxman and announces the results of each roll and then collects the dice with an elongated wooden stick.

A new shooter, who must bet the table minimum on either the pass line or the don't pass line to play, is given five dice by the stickman and picks two.

When the shooter rolls the dice, the dealers will usually insist that the dice be rolled with one hand and that they bounce off the wall surrounding the table. If a die leaves the table, the shooter will usually be asked to select another die from the remaining three but can request using the same die if it passes the boxman's inspection. These requirements are used in an effort to reduce cheating the game by substituting loaded dice for the regulation dice.

2 Types of craps bets

The fundamental bet in craps is the pass line bet, in which one bets that the shooter will pass. There is also a don't pass line on which one can place a bet that the shooter will miss out, indeed the shooter may bet that he or she will miss out. The following discussion assumes that the shooter, as is usually the case, is betting on the pass line.

If a point is made, most casinos allow pass line bettors to take odds by placing from one to five times (and at some casinos, up to 100 times) the pass line bet behind the line. This additional bet pays at the true odds, 2-to-1 if 4 or 10 is the point, 3-to-2 if 5 or 9 is the point, and 6-to-5 if 6 or 8 is the point. While the house has a small (1.4%) advantage on pass line bets, the house has no advantage at all on odds bets. Therefore, taking the maximum odds (which vary by casino) can lower the house percentage for any given bet down to as low as 0.5%.

Odds bets in craps may be the only bets offered at a casino that are completely free of house advantage probability-wise. Let's see why that is: There are 36 possible permutations (ways to roll a pair of 6-sided dice):

1-1 = 1 way to make a 2 1-2 2-1 = 2 ways to make a 3 1-3 2-2 3-1 = 3 ways to make a 4, true odds pays 2-1 1-4 2-3 3-2 4-1 = 4 ways to make a 5, true odds pays 3-2 1-5 2-4 3-3 4-2 5-1 = 5 ways to make a 6, true odds pays 6-5 1-6 2-5 3-4 4-3 5-2 6-1 = 6 ways to make a 7 2-6 3-5 4-4 5-3 6-2 = 5 ways to make an 8, true odds pays 6-5 3-6 4-5 5-4 6-3 = 4 ways to make a 9, true odds pays 3-2 4-6 5-5 6-4 = 3 ways to make a 10, true odds pays 2-1 5-6 6-5 = 2 ways to make an 11 6-6 = 1 way to make a 12

There are a total of 36 possible combinations. So on the come out roll there are 8 ways to win, 4 ways to lose and (36-12=) 24 ways to start a point.

The odds on making the point are the ratio of number of ways to make a 7 divided by the number of ways to make the point. For example, there are five ways to make a 6 or 8, so the odds on making a point of 6 or 8 is 6:5.

Most experienced Craps players only make Point Line and "Odds" bets since the odds are much more favourable to the player than any other bets in Craps, and in fact most casino games.

The rules for the come and don't come wagers are the same as for Pass and Don't Pass except that they can only be made after the come out roll. Effectively, they represent starting a new game using the same stream of numbers being generated by the existing (pass line) game.

Because of the come bet, if the shooter makes their point, a player can find themselves in the situation where they have a come bet with odds on it, and yet be rooting for the shooter to roll a 7 on their next come out roll. Because of this, it is usual that odds bets on come wagers are presumed to be not working. That means that if the shooter rolls a 7 on the come out roll, any players with active come bets loose their initial wager but will have their odds money returned to them, unless they tell the dealer that they want their odds working. Conversely, if the shooter rolls a number that matches an active come bet, the original bet is paid off at even money and the odds money is returned to the player (unless they told the dealer that they wanted their odds working, in which case they are paid at the true odds).

Casino craps layouts bar either 2 or 12 on the don't pass and don't come bets. This means that if 2 is barred and the shooter rolls a 2 on the come out roll, the wager is a stand off and the players money is returned.

When betting against the shooter, the bettor must put up the long side of the bet. Thus a don't pass better who bets $10 when the point is a 4 could put $20 behind the line. If the shooter rolls a 7 before achieving their point, the better would receive $10 for the don't pass line bet plus $5 for their odds bet. Even though the house advantage on the don't pass and don't come bets is almost identical to the pass line and come bets, for most players the disadvantage of putting up the long side of the bet makes the pass line bet more desirable. Additionally, many craps players consider don't pass and don't come bets to be in poor taste, or even "taboo".






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