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A parlay or accumulator is a single bet that links together two or more individual wagers and is dependent on all of those wagers winning together. The benefit of the parlay is that there are much higher payoffs than placing each individual bet separately since the difficulty of hitting it is much higher. If any of the bets in the parlay loses, the entire parlay loses. If any of the plays in the parlay pushes, the parlay reverts to a lower number of teams with the odds reducing accordingly. http://en.wikipedia.org/wiki/Parlay_(gambling)