User-agent: googlebot
Disallow: /grube
Disallow: /?sort=date_desc
Disallow: /?sort=title_asc
Disallow: /?sort=url_asc

User-agent: msnbot
Crawl-Delay: 20
Disallow: /grube
Disallow: /?sort=date_desc
Disallow: /?sort=title_asc
Disallow: /?sort=url_asc

User-agent: Slurp
Crawl-Delay: 20
Disallow: /grube
Disallow: /?sort=date_desc
Disallow: /?sort=title_asc
Disallow: /?sort=url_asc

User-agent: *
Disallow: /grube
Disallow: /?sort=date_desc
Disallow: /?sort=title_asc
Disallow: /?sort=url_asc