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In gambling in general and the game of craps in particular, snake eyes is the outcome of rolling the dice in a game and getting only one pip on each die. The pair of pips resembles a pair of eyes, which is appended to the word snake. The dictionary of etymology traces use of the term as far back as 1919. Ancient Roman dice games used the term dogs to describe a throw of double ones, referring to this as "the dog throw".
Because this is the lowest possible roll, and will often be a loser in many dice games, such as craps, the term has been employed in a more general usage as a reference to bad luck. In some board games, such as Monopoly, house rules may decide that this roll earns the player a bonus (for example, a free turn when rolling a "double") due to it being rare and otherwise disadvantageous.
The odds of rolling snake eyes on two six-sided dice are 1-in-36 (1/6 x 1/6).
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