5Kbk/6pp/6P1/8/8/8/8/7R w - - 0 1

k@h8 path g8 g7 h7
g8 g7 is covered by K@f8
h7 is blocked by p@h7
h8 can be attacked by Pg7
Pg7 is blocked by p@g7
p@g7 can't move (Rh6 is possible)
h8 can be attacked by Rxh7
Rxh7 is covered by b@h8
b@h8 can't move
k@h8 can't move
p@h7 must move
p@h7 has ph6 and ph5
Rh6 blocks ph6 and ph5
black is in zugzwang.

Restrict k@h8
 Restrict kg8
  ok K@f8
 Restrict kg7 
  ok K@f8
 Restrict kh7
  ok p@h7
Attack k@h8
 Pg7
  cond move blocked by p@g7
 Rh_ and _-8 is empty
  cond Rxh7 covered by b@g8
Put in zugzwang
 Restrict k@h8
 Restrict b@g8
   b@g8 covers Rxh7
   b@g8 can't move
 Restrict p@g7
   p@g7 blocks Pg7
   p@g7 can't move
 Restrict p@h7
   Restrict ph5
     ok Rxh5
   ph6