How it works? Well, as you can see, black is threatening to checkmate me by moving his queen to a1. I decided to move my queen to d8. His only move is to capture my queen. Then, I doublechecked him by moving my bishop to a6. He couldn't capture my bishop because his king would still be in check, so he could only move left or right. No matter he moved left or right, I checkmated him by moving my rook to d8. Brilliant moves can UNO reverse everything!
Note: The doublechecking move is a great move.
