We have seen how to round up a king using a king and a queen. We also need to be able to do this using a king and a rook. This diagram shows the squares that the White pieces control. We need to use the power of these pieces to:-
1. Push Black's king to the edge of the board
2. Ensure that he does not escape.
3. Bring our king to face Black's king
4. Check the king so that he has no flight squares - Checkmate!

Firstly, we need to decide which edge we will drive Black towards. Since he is already in the top half of the board and our king is also there, we shall make him move upwards. Click on the h4 square to move the Rook there.