This is a dream scenario for white. He is threatening three brutal combination attacks (shown below) and black is on his heels, using every single one of his pieces to tenuously defend against them.

But they’re all covered by black aren’t they? The key here (as you might expect based on the Topic’s topic) is to use a block!

This block blocks black’s rook from defending the d pawn. Now the first combination will be successful.

Game over!