I know that 2 terrain pieces touching corner to corner block LOS, cannot be shot through and cannot be moved through by infantry, but what if you replaced one of these terrain pieces with a Mech, do the same rules apply?

this is a grey area for me .

i my self would say no , that it does not .

i would also say that tank traps in this situation would also not block LOS , despite what some other would say .

my reasoning is that because other figures can share the space with walkers/tanktraps , or be moved through by friendly squads , niether takes up the entire square despite their blocking LOS through their square . additionaly , since both infantry and tank traps in a similar situation can be fired over , i would denote special "cover elements" and units would not follow the standard "terrain" rules

the tank trap is a "cover element" , not "terrain" , and can be placed in such a way thet it does not cover the center dot in the square , which is part of the definition for the fully blocking terrain tiles . and the walker is not "terrain" , its a "unit" .

i could bve totaly wrong in this , and would not be upset if over ruled by an official ruling from either FFG , or DG , or ZAM. from a BGG posting , but as we know , none of them will post anything HERE , so this is just my 2 cents based on my reading of the rules .

Major Mishap said:

Yes and no.

Pg 11 says that vehicles are just like a square without a dot (column one, paragraph one) and they block LOS for friendly and enemy squads and vehicles. Pretty clear there.

Pg 11 column two paragraph one says regarding the opposite corner rule "This rule works with anything that blocks line of sight: a wall, a square without a dot, a vehicle , and so on." So for LOS we have the vehicle acting as a square without a dot pretty consistently. I think for LOS purposes it's clear. You couldn't shoot through the diagonal formed by a wall and a bot.

Movement is another thing altogether since a squad CAN move through a friendly bot. Assuming it's a friendly bot and not an enemy, the only question is can you move diagonally through that space?

Since you are allowed to move diagonally across one corner of terrain, and you can move through your own bots I'd say yes you can. Admittedly that's a drawn conclusion and not a direct ruling, but it meets all the rules requirements and doesn't violate any.

Yup, I agree with that conclusion Major, but when we played last night we also had a falme thrower attempting shooting between them (friendly bot) and that didn't feel right. but you can't make exceptions to rules, so my bot got fried

Major Mishap said:

Ignore the above, got myself confused - I just agree with you

Yeah, I agree it is blocked. The diagram on page 11 shows the mech unit blocks the infantry from firing. Why would adding a wall to the other side of the LOS unblock the mech side?

If you feel you can fire through a hex with a mech unit or tank trap when a wall is present for the other half of the LOS, why not just say they can fire through all the time and tank traps and Mechs dont block LOS "neither takes up the entire square".