In a match yesterday I had the idea of abusing the Tainted Land PowerPoint to find out whether my opponent has built a mill on a certain spot that you can't see. You just click the TL/EW icon on the left of the screen and move the cursor on the mill/farm spot that you want to check. If the big circle is white (which means that it would be possible to cast land around the spot) there is NO mill/farm, if it's red (which means that it would be impossible to cast land around the spot) there is a mill/farm. You needn't cast the land there, only check whether the circle is red or white. That way you can prevent e.g. that you send let's say 3 orcs to a mill spot to destroy the mill there but when you arrive you see that there isn't even a mill built
In this screenshot I saw that my opponent didn't built the top right farm on Westfold so I knew that I can send an orc there to built the mill myself.
This same technique can be applied with all settlements, castles and outposts and can be a quick and easy way of discovering the availability of certain points.
