Twenty Fourteen Theme (using full width)

Hey Guys,

I have been working on the Twenty Fourteen Theme and so far it really looks good. I was wondering if there is a way to use full width for content on individual pages.
I downloaded the Fourteen Extend plugin but unfortunately it either set all pages to full width or nothing. I wish there was an option to set individual pages to full width and not all pages. I don’t know if by creating a child theme I could solve this issue.
My Site http://greensborochess.org/

Any help Or advice would be highly appreciated.

Many Thanks
Jacob