Black to Move
Awesome position to get our brain going. Black to move and do a deadly fork. Basically blacks moves and gets a good exchange, no matter what black gets a solid exchange for the move.
And now no matter what White does, black gets the good exchange, so if axb3?, then Qxa1+, if any other stupid move Knight takes the Rook, so in this position the Rook is a gone no matter what White plays. Forks are always good to practice.