Looks like I answered it myself
1 variable in the layout and 1 or 2 variables in 1 of 2 partials.
"capture_haml" to the rescue!
- @page_title = "About us"
- @wide_content = capture_haml do
some wide content
- @content = capture_haml do #used by layout
= partial('_no-sidebar') #uses @wide_content