I wrote:
> "sitting in the shade of the s'chach" ... means "sitting
> in a place which WOULD be in the shade of the s'chach 
> IF the sun were directly overhead."

Micha Berger responded
> If the sun were perfectly overhead, walls wouldn't block
> it at all. And thus there would be no shiur.

Yes, and R' Chaim Manaster (and others?) wrote similarly. I think I'm 
missing something. Is there a posek somewhere who says that even if 
you are directly under kosher sechach, you're not yotzay if you're 
too close to the wall and in the shade of the wall? That sounds quite 
bizarre, for the reasons that I've written, yet some posts seem to 
say that such a shita exists. Is it possible that such writings are 
actually about sitting under a slanted wall, so that he is actually 
not under the sechach at all? Makoros greatly appreciated. Thanks, 
everyone.

Akiva Miller