User-agent: Googlebot
Disallow: /assets/
Disallow: /cgi-bin/
Disallow: /images/
Disallow: /phpBB2/

User-agent: Googlebot-Image
Disallow: /assets/
Disallow: /images/

User-agent: *
Disallow: /assets/
Disallow: /cgi-bin/
Disallow: /images/
Disallow: /phpBB2/