Disabling sidebar for specific post-page

Thanks so much for your time, Flynn!

Quick question: Can I disable my sidebar for a specific post-page? Or even all the post-pages of a specific category?

In the "sidebar" section of your interface you can disable sidebars for the "category page", but:

"This will turn on/off sidebars on category pages (pages that list the posts in the given category), but not on "all single post pages of posts in category XX". "

I DO need to turn off sidebars on "all single pages of posts in category XX."

Any ideas? Thanks again!