Double attack (2))
A double attack is a great trick to attack two pieces at the same time. But you can also use it to attack a piece and a mating square. Your opponent has to protect the mating square (or he loses the game) and cannot save the piece as well.
What do you have to do?
Win material by attacking two things at the same tiem: two pieces, a piece and the king or a piece and a mating square.