In poker, four out of five cards needed to make a straight if the middle number is the one missing.
Opposite of [open-ended] (four cards in a row that will make a straight with either low or high card).
A gut-shot straight draw is less likely to suceed because there are only four cards that can help you. [Open-ended] straight draws have better odds because there are eight cards that can make your straight.
> Gut-shot = 2,3,_,5,6 or 9,10,_,Q,K
> Open-ended = _,3,4,5,6,_ or _,10,J,Q,K,_