 One goal is getting in the square of the black pawn, so it can be intercepted, and the other is getting to the d6-square to support the promotion of his pawn.The black king will have to spend two tempi to stop the white pawn from promoting, and this is the number of tempi the white king needs to gain in order to get into the square of the black pawn.The second diagram shows the number of ways that the white king can get to various squares in the minimum number of moves.