yo lo tengo de esta manera, por si le sirve a alguien:
Insertar CODE, HTML o PHP:
User-agent: *
Disallow: /wp-
Disallow: /feed
Disallow: /comments/feed
Allow: /flag/$
Allow: /ico/$
Allow:/browser/$
Disallow: /*/feed/$
Disallow: /*/feed/rss/$
Disallow: /*/trackback/$
Disallow: /feed/$
Disallow: /feed/rss/$
Disallow: /trackback/$
Disallow: /*/*/feed/$
Disallow: /*/*/feed/rss/$
Disallow: /*/*/trackback/$
Disallow: /cgi-bin
Disallow: /wp-admin
Disallow: /wp-includes
Disallow: /wp-content/plugins
Disallow: /wp-content/cache
Disallow: /wp-content/themes
Allow: /wp-content/uploads
# Google Image
User-agent: Googlebot-Image
Disallow:
Allow: /*
# Google AdSense
User-agent: Mediapartners-Google*
Disallow:
Allow: /*
# Internet Archiver Wayback Machine
User-agent: ia_archiver
Disallow: /
# digg mirror
User-agent: duggmirror
Disallow: /
# BEGIN XML-SITEMAP-PLUGIN
Sitemap: [url]http://tudominio.com/sitemap.xml.gz[/url]
# END XML-SITEMAP-PLUGIN