Another Redirect issue... Please gimme a clue!

I'm trying to redirect this URL:

w_ww.whatever.com/tag/?keyword=shenron

to

w_ww.google.com

(the names and domains are not important)

I've tried with: (htaccess)

redirect 301 /tag/?keyword=shenron http://w_ww.google.com

and with

redirect 301 /tag/\?keyword=shenron http://w_ww.google.com

and with

redirect 301 /tag\?keyword=shenron http://w_ww.google.com

none seems to work

Can you give me a hand?

I can give full real details by PM if you need to test something or see my current htaccess.

 

RewriteRule ^/tag/?keyword=shenron$ http://www.google.com [R=301]

 

whatever.com/.htaccess

Options +FollowSymLinks
RewriteEngine On
RewriteBase /
RewriteCond %{QUERY_STRING} keyword=shenron
RewriteRule ^tag/ http://www.google.com/ [R,L]

Code (markup):