Here's the current concept seen from Black’s side, and this time against a castled king. One of the hazards of allowing a king to lose part of its pawn cover is that pieces can then be pinned to it. Here White’s knight and bishop are lined up with Black’s queen aimed through both of them like a kebab. If one of the White pieces could be removed, the one left behind would be pinned to the king. Again Black makes use of a pawn: h5-h4, and White’s knight has to vacate its square to survive. Now the bishop is paralyzed, and again the pawn simply marches forward to take it with h4-h3 and then h3xB a move later.