RewriteEngine On

RewriteCond %{THE_REQUEST} /([^.]+)\.php [NC]
RewriteRule ^ /%1 [NC,L]

RewriteCond %{REQUEST_FILENAME}.php -f
RewriteCond %{REQUEST_FILENAME} !-f
RewriteRule ^(.*)$ $1.php [NC,L]

ErrorDocument 404 /404.php

RewriteCond %{REQUEST_FILENAME} !-f
RewriteRule ^([0-9a-zA-Z-_]+)/([0-9]+)$  blog.php?sef=$1&id=$2 [L]

RewriteCond %{REQUEST_FILENAME} !-f
RewriteRule ^GeneralRanking/([0-9]+)$  GeneralRanking.php?nation=$1 [L]