Double-chance function

A double-chance function is a way of playing a game twice so that you have a better chance of winning. It's like getting two tries at something, instead of just one. For example, if you're playing a game of guessing a number, you usually only get one guess. But if you use a double-chance function, you get two guesses, so if you guessed wrong the first time, you still have a chance to get it right the second time.