User-agent: *
Disallow: /about/

User-agent: Yandex
Disallow: /about/
Host: www.sv-opt.ru

User-agent: Googlebot
Disallow: /about/

User-agent: StackRambler
Disallow: /about/

User-agent: Slurp
Crawl-delay: 3
Disallow: /about/