As we know that when we search wordpress based site it shows this type URL on browser
__http://www.wordpressdemo.com/?s=wordpress
now at this moment our query is wordpress
for demo please view below link
http://www.opensourcecms.com/scripts/search.php
its first result is
http://www.opensourcecms.com/scripts/details.php?scriptid=88&name=WordPress
my requirement is when user search a query wordpress automatic show 1st result post Instead of result page.