#rate limit yandex  (high traffic)
User-agent: Yandex
Crawl-delay: 60
Disallow: /wp-admin/
Disallow: /?blackhole

#disallow ahrefsbot
#https://ahrefs.com/robot
User-agent: AhrefsBot
Disallow: /

#allow Google bot access to most things
User-agent: Googlebot
Disallow: /wp-admin/
Allow: /wp-admin/admin-ajax.php
Disallow: /?blackhole

#rate limit all other bots a bit
User-agent: *
Crawl-delay: 5
Disallow: /wp-admin/
Disallow: /?blackhole