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What is Open-ended straight draw in poker?

A straight draw where the player already has four consecutive cards, using the board and their hand, and will make a straight if a card at either end of their four completes; an 8-out straight draw. For example, a player with 56 on a board of 78K2 has an open-ended straight draw as they have 5678, and will make a straight on either a 4 or 9 river. Also frequently described as simply being "open-ended".
Other terms
Omaha On the button One chip rule One-gapper Open limp Opener Option Orbit Out Of Position (OOP)