Hanging Pawns in the Queen Openings
Hanging pawns are an open, half-isolated duo. It means that they are standing next to each other on the adjacent half-open files, usually on the fourth rank, mutually protecting their stop squares. They share a number of characteristics of weak pawns - they are not directly protected by other pawns and may become targets of attack - but unlike them they have dynamic potential of executing a pawn breakthrough and thus creating a passed pawn. In this video IM John Watson puts in practice all the theory he's explained in his series on the Pawn structures, by using the Queen Openings.