.htaccess help

I need help with .htaccess in reference to redirecting files:

currently this is my .htaccess file


<IfModule mod_rewrite.c>
RewriteEngine On
RewriteBase /blog/
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule . /blog/index.php [L]

</IfModule>

I used to have

/blog/archives/yy/mm/dd/(article name)

and now I have

/blog/yy/mm/dd/(article name)

I found some links about permalinks and tried to insert their comments and my comments caused internal server errors. Therefore, I do not know what I did wrong. Can someone please help me write a redirect to where when links to the old structure are clicked, they are automatically restructured and forwarded.

Thanks in advance for your help and support.