User-agent: *
Disallow: /Chat/
Disallow: /images/
Disallow: /aspnet_client/
Disallow: /log_data/

User-agent:
Disallow: /

User-agent: Java (Often spam bot)
Disallow: /

User-agent: crawl
Disallow: /

User-agent: *bot
Disallow: /

User-agent: bot*
Disallow: /

User-agent: spider
Disallow: /

User-agent: robot
Disallow: /

User-agent: Yandex bot
Disallow: /

User-agent: Yandex
Disallow: /