User-agent: *
Disallow: /bitrix/
Disallow: /ajax/
Disallow: *print=
Disallow: *register=
Disallow: *_password=
Disallow: *login=
Disallow: *logout=
Disallow: *auth=
Disallow: *backurl=
Disallow: *BACKURL=
Disallow: *back_url
Disallow: *BACK_URL=
Disallow: *index.php$

User-agent: Yandex
Disallow: /bitrix/
Disallow: /ajax/
Disallow: *print=
Disallow: *register=
Disallow: *_password=
Disallow: *login=
Disallow: *logout=
Disallow: *auth=
Disallow: *backurl=
Disallow: *BACKURL=
Disallow: *back_url
Disallow: *BACK_URL=
Disallow: *index.php$