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 (admittedly being an isolated pawn at the same time). The side with hanging pawns also tends to enjoy a space advantage.
The Hanging Pawns formation
8/pp3ppp/4p3/8/2PP4/8/P4PPP/8 w - -
Most of the programs do not have a special evaluation of hanging pawns, relying on search to decide if they are an asset or a liability in a given position.
- The Queen's Gambit - Hanging Pawns from Pawn structure at Wikipedia
- Hanging Pawns, Ten Cents a Pair review by Larry Tapper from ChessCafe.com
- Hanging Pawns from chessgames.com
- The Lounge Lizards - Snakes Can´t Sleep (the hanging), Jazz Gipfel 89, Liederhalle, Stuttgart, July 22, 1989, YouTube Video