Obstacles

 The following position is the same as in the previous post, but now with the black king on a different position.

The problem is that the black king has no waiting room. The two squares that he needs to wait on contain an obstacle. He cannot use b5.

White can use that to get the opposition by force. By entering the attacking square f5, he can attack two squares in the opposition zone. Black cannot put his king on the defensive square b5 because it is forbidden. Black has no choice other than to enter the patrol zone. White can immediately take the distant opposition by force.

• 1.Kf5 Kb6 2. Kf6 or
• 1.Kf5 Ka6 2.Ke6

f5 = attacking square with double attack

b5 = defensive square with double defense. But b5 is taboo.

It is essentially a triangulation. But with an explanation why you can expect it to work (the obstacle b5).