When the position is mutual zugzwang and you are to move, a three-step king route returns to the same square with the opponent on move.
White has pawns on c5 and b6 against Black's b7; the kings stand on d5 and d7. If it were Black to move he would be lost at once: ..Kc8 allows Kd6 and Ke7/Kc7 ideas, ..Ke7 allows Kc6 and the b7-pawn falls, ..Kd8 allows Kd6 with the same effect. But it is White to move, and the direct attempts fail: 1.Kd6 is impossible, and 1.c6+? bxc6+ 2.Kxc6 Kc8 is only a draw because the knight pawn against a king on c8/b8 cannot be forced through.