XF 1.4 Specific Forum Guest views block

I think i made bad example: i need restrict Guests to VIEW ONLY SPECIFIC forums . I meant views not posts
forum 1 < guests can view
forum 2 < Guests cant view (thread) unless registered
forum 3 < guests can view
forum 4 < guests can view

So only specific forum or thread in forum cant be viewed

iam sorry i didnt explain clear