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1)
RewriteCond %{REQUEST_URI} !^/wp-admin [NC]
RewriteCond %{QUERY_STRING} author=\d
RewriteRule ^ /? [L,R=301]


2)
# Stop wordpress username enumeration vulnerability
RewriteCond %{REQUEST_URI}  ^/$
RewriteCond %{QUERY_STRING} ^/?author=([0-9]*)
RewriteRule ^(.*)$ http://yoursite.com/somepage/? [L,R=301]