Checkmate (4)

Another lesson about checkmate. Things get a little bit harder, this time.

Now, besides a king, black also has one or more other pieces. 

You will also find out that the queen is not the only piece you can use for checkmate. Rooks, bishops, knights and pawns - they can all create a checkmate.

What do you have to do?

Checkmate the king. Make sure that Black cannot take your piece.