Sorry, I realise it's not super clear.
I'm using a line of sight system to determine who can see what:

Basically, if a player piece or an enemy piece can draw a straight line to see any part of the other, then it's allowed.

UG wouldn't have been able to do the same:

In Warhammer 40K, the players literally crouch down and look from the piece's viewpoint to see if they can see the enemy, obviously we can't do that here, so I'm just drawing lines.