Finally, let's look at a couple of other types of forcing sequences that can lead to pins. In this first example White has no checks to give, but there is a natural capture to consider in NxB—particularly since the bishop is guarded just by the king, which will move to d6 on the recapture. Now assess the board as it would then look, asking the standard questions about the king and pieces on its lines. You see that the king’s move will cause the knight on d5 to become pinned by the rook on d1, and thus paralyzed; and you can take advantage of this by throwing a pawn at the pinned piece with e2-e4, winning the knight a move later.
The point: examining forcing moves means studying any checks you can give. But it means looking at any captures you can make, too, since replies to them usually are simple enough to predict. This is especially important when you can take a piece guarded only by the enemy king. Any recapture will then require the king to move, and its movement may create the usual nice opportunities for pins and other tactics.