Mating Position with King in Corner.
The stronger side forces the hostile King to the border and if need be into a corner by proceeding as the fisherman who drives fish into his net and then draws the net, narrowing down the space available to his prey until finally no room is left to the victim.
But there is a point that needs further elucidation. After all, the above picture does not come true to reality. Let us consider the following position: