hide forum node

Hello, I've created a page node on my forum that I only want to appear in the forum node list for certain groups, but I want the page itself to be accessible via direct linking for ALL groups, all the time. Thus far, it appears the only way I can "hide" the node from view on the forum list is...

Is there a way to do this? I assume I need to use conditional statements, but how? I have a forum with posts I want to remain available for search engine purposes but I want to hide the node on the forum list page, but not the node's content - but for guests. When I change the Unregistered...