- Home page, listing everything
- Red Headings, e.g. Bridge-Related Discussion, BBO Discussion, International Forum, etc
- Subheadings, e.g. Natural Bidding Discussion, Non-Natural, etc.
- Threads within each subheading
It appears to me that searches can be done for Tiers 1, 3 and 4 above, but not for Tier 2. Am I missing something? Would it be easy to include a Tier 2 restriction?