Setting up a skewer: threat (2)
Besides the forcing moves check and capture, a third iteration is threat. With a 'threat' you can think of attacking a piece, a mate threat or threatening to promote. The purpose of the threat is to change something in the position so that a skewer can be performed afterwards. In the examples below, we see an attack on a piece. In Example 2, the attack on a piece is accompanied by a sacrifice.
What do you have to do?
Provide a threat (attack a piece, mate threat or threaten to promote). Subsequently win material with a skewer.
There are three black pieces on one diagonal, the bishop, the king and the rook. White also has a piece that can land on this diagonal. First, let's get rid of the black bishop! 1.d4! attacks the bishop. If Black does not withdraw the bishop, White wins a bishop (2.dxc5). If black does move the bishop, white wins a rook: 1...Bb6 2.Ba3+ (a skewer) 2...Kd7 3.Bxf8.
