Any well written book on chess tactics will point out that most tactical moves are based on one or more hanging pieces. What do I mean by a hanging piece? No, I am not referring to a painting on a museum wall. A hanging chess piece is merely an unprotected piece.
In the diagram of a chess position that was reached at ICC, both the Black Rook and Black Queen are unprotected or hanging. With White to move, can you see a forcing chess move that ends the game? Look under the diagram to see the winning move!
The winning move is Bishop captures pawn at f5 or Bxf5. Do you see why?