So my friends and I were playing the side mission "Generous Donations" and I know you can move Diagonal, and you can't if there is a red line on both sides but what is one is red side but the other isn't can you move diagonal by it? So if one corner has a red edge can you diagonal on it as lone as two squares aren't red and touching? like on the grass area below.

It's very difficult to understand what you are asking exactly but looking at the map below there are two situations I can think of. If you are positioned in the blank regular space between the rocks surrounded by red lines you cannot move diagonally downward through a corner where two red lines meet. You can move diagonally from the space directly in front of the AT-ST's right foot to the space down one and left one from that space.

The top left example on Page 27 of the Rules Reference Guide may help you. In Movement 1 in the diagram a figure moves diagonally past impassible terrain.

red square 1 / blank square 2

blank square 3 / blank square 4

Moving from square 2 to square 3 is allowed.

Yeah, that grass tile with the "sniper perch" of rocks is exactly what the rules mean when they say "the diagonal intersection of <wall/blocking/impassable>". The phrasing is useless, but that's the situation it describes: technically there are two passable spaces which are diagonal to eachother, so they are adjacent (edit: no they are not adjacent, per RRG pages 4 and 26) and you can shoot outward while standing in the middle (edit: no you cannot) but you cannot move through that diagonal because it is the "diagonal intersection of blocking terrain"

Thanks guys

In the above picture if you were standing in the "sniper perch" or the gap between the red blocks would you have line of site on Diana and Mak? Meaning can you trace your line of sight from your figures bottom left corner even though it has two red blocking terrains butting into each other? I note in the rules it states "Line of sight cannot be traced through a corner where any combination of walls and blocking terrain intersect." So i've assumed that you cannot see the other figures, is this not the case?

So if one part of the terrain has a solid red mark corner but the rest is normal terrain no walls or anything and your trying to shoot diagonal though the line of sight goes through one side of the red it can't be a true line of sight? Tromsicle

If you're standing in the middle of the blocking terrain on that tile, I think you can still trace LOS out (for example to Diala and Mak in that picture) because those LOS lines don't really pass "through" the corner gap, rather they originate directly on that intersection, so they're as much "after" the corner as "before" it.

No, sorry, scratch all that, I'm wrong. I always thought of that as a "sniper perch" that was clearly designed to be used in that way (especially for Mak to use Ambush, by having LOS out but not back in to him). But the rules do indeed say otherwise:

RRG page 26, Appendix I - Line Of Sight Examples, #16 in the bottom center: "Line of sight cannot be traced through the diagonal intersection of any walls or blocking terrain."

It's only when standing next to figures that you can do this to achieve one-way LOS (as in example #17 on the same page).

That rule does make that terrain tile kind of strange though. What's the point of having that single extra bit of passable terrain back there, if you can't shoot out from it anyway? May as well just have a solid line of blocking terrain all the way across the back of the rocks.

red square 1 / blank square 2

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blank square 3 / blank square 4

There is line of sight from square 2 to square 3.

red square 1 / blank square 2

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blank square 3 / red square 4

There is no line of sight from square 2 to square 3.

red square 1 / blank square 2

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blank square 3 / blank square 4

There is line of sight from square 2 to square 3.

red square 1 / blank square 2

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blank square 3 / red square 4

There is no line of sight from square 2 to square 3.

Right, perfect, that is the way I understood it.

Thanks Guys so much for all the feed back !!!!!!!! love the community on this forum! Any suggestions on some decent tactics how to play as MAK?