Redirect URL with fancy URL turned on

[Carlos]

I did. But private pages are not visible when admin is logged out.

:-? If your "block pages" are set as private, they won't be included in the sitemap, and they won't be visible by visitors. The plugin that displays their contents on non-private pages would have no problem to read those pages...

Anyway it is better if you also do the redirection you want, I think it's a good idea.

I'd like to redirect that first page to the second one, but

Yes, that doesn't work. I don't know much about .htaccess and that... Take a look at this thread, there several redirection examples for GS, some might suit you.
http://get-simple.info/forum/topic/1552/...direction/