A knight always moves from a light square to a dark one and vice versa and if in the end game you are fed up of his repeated checks then if you place your king on the same diagonal on which the knight stands but with one intervening square between them the king cannot be checked under three moves.
http://www.chess.com/blog/softpetals/some-observations-about-knight
A knight always moves from a light square to a dark one and vice versa and if in the end game you are fed up of his repeated checks then if you place your king on the same diagonal on which the knight stands but with one intervening square between them the king cannot be checked under three moves.