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the reason for this seems to be that they are not linked from the home page (third level pages). do spiders stop at the second level during large updates and then spider deeper when they have some spare time, so to speak?
I was under the impression a site would always get spidered to the third level, which explains the need for a sitemap to ensure all pages are searched.
There are many other variables that you should check to make sure your website is completely accessible by the search engine spiders and bots.
- query strings and special characters in URLs
- image maps
- JS navigation
- passwords
- messy code or site structure
- broken links
- frames
- Flash (certain search engines will follow Flash links)
Search Engine World has a good tool to see what the search engine spiders see: Search Engine Spider Simulator [searchengineworld.com]