I have tried to show the most important rules in one picture. It is certainly not complete but it gives the most important information. Have fun with it.

hmm that's great

How would people feel if your unit could fire in the bottom two scenarios but would receive a hefty damage penalty and friendly fire damage would be applied to the friendly unit in the line of fire in the bottom left scenario? 

MadDutchman wrote:

How would people feel if your unit could fire in the bottom two scenarios but would receive a hefty damage penalty and friendly fire damage would be applied to the friendly unit in the line of fire in the bottom left scenario? 

It is interesting idea but I don't know if Amplitude will change something to the base. Maybe a mod?

Hmmm I did not know you could not shoot up a cliff if the target is one or more square back. I just don't like, and find it confusing, how you can't attain LOS if a unit abstains 50% of your sight as in your final frame. I'd think you could at least squeeze it in there but... no.

There's two ticks of height difference between unit and target so you can't fire at it, it's pretty consistent within its own rules.

What I'd love to see, is taking away indirect fire from archers and change it so that they can fire at enemy in bottom two scenarios, i.e. they could fire over one tick of elevation, to make archers work more along the lines of, well, actual archers instead of having them fire over mountains (and give them generic classical variant, so they can keep up CS-wise after nerf). Only issue I see with that is I have no idea how to word the tooltip, if they decided to not provide 'two ticks of elevation' info in the general tooltip.