I have invented the category "incomprehensible"
It contains problems with moves that I will not find in an OTB game since they don't make sense to me. Take for instance this problem:
White to move.
You can find the solution here.
The first move is Rcd7+
I am not able to formulate a narrative that describes in a positive way why this move is so good. What does it accomplish?
I can only formulate it in a negative way: every other move is bad. Such moves simply blur my mind. There is no way I can find such moves myself as long as I don't see what it does.