Let's just say a "friend" wants to do a guest blog on your site with a link to their site, but you aren't very happy about it. You can't say no, but you don't want to be playing the "link juice" game.
Is there a way that I can instruct Google to completely ignore this URL and any links on it, without leaving any markers on the page itself?
As far as the person in question knows, the page is live with a dofollow backlink, but secretly Google has been instructed to ignore this page completely?
One idea I had was to add some code to detect search engines and return a 404 when they visit. I was worried Google might spot the difference and punish me for trying to give the spider a different page.