To counter this, experienced players take full advantage of 'free odds' - bets on which there is zero house advantage. 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. 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. While experienced 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. Since there is no correlation between die rolls, there is no possible winning strategy over any given period of time.
All bets have a negative expectation, except the 'free odds' bet with an expectation of 0, that the player is allowed to make after a point is established on a flat (line) bet. 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%). Players wager money against the casino on the outcome of one roll, or of a series of rolls of two dice.
Craps (previously known as crabs) is a popular casino gambling game using dice.
