Square battle grid logic on UE

Hello peoples!
Need a little help about logical elements using in blueprints.
I create simple square battlegrond where grid plates generate with a varibales X and Y from 0.
Now I wanna to make a function that can check which plates stand at N moves from selected, like in usual games where character can move in four direction.
There is a quick move where I show which function I create but it’s not work right, some things I changed but anyway didn’t solve it.
Link

Can you give me examples of how I need to create logic function which check plates near someone at any distance?

Thanks in advance.