Blocking Google Only

From certain sub domains

[Moncao]

Being a victim of Google's new algo, I need to stop them (Google) from crawling certain sub directories of my site. How do I do this?

[goodroi]

Add this to your robots.txt
User-agent: Googlebot
Disallow: /subdirectory1/
Disallow: /subdirectory2/
Disallow: /subdirectoryetc/

[google.com...]

To verify your robots.txt is correct you can use Google Webmaster Central.

[Moncao]

Hi Goodroi

Thanks, but Google's own pages say to leave sub-directories /open without the traling backslash, no /closed/ as with everyone else.

[goodroi]

to further complicate things you can look at their own robots.txt file (http://www.google.com/robots.txt) which uses both styles :)

[encyclo]

I believe there is a difference between the two styles (please correct me if I'm wrong!). As I understand it:

Disallow: /foo

Matches

/foo/

and

/foo.html

Whereas:

Disallow: /foo[b]/[/b]

Matches the directory only.