I am about to move my Thailand-focused travel website into a new, broader Asia-focused travel website. The Thailand site has had a sad history with Google (algorithmic, not penalties) so I don't want that history to carry over into the new site. At the same time though, I want to capture the traffic that Google is sending me right now and I would like my search positions on Bing and Yahoo to carry through if possible.
Is there a way to make all that happen?
At the moment I have migrated all the posts over to the new domain but I have it blocked to search engines. I am about to start redirecting post for post using meta-refresh redirects with a no-follow for safety. But at the point where I open the new site up to indexing, should I at the same time block the old site from being indexed to prevent duplicate content penalties?
Also, is there a method I can use to selectively 301 redirect posts only if the referrer is Bing or Yahoo, but not Google, before the meta-refresh fires? Or alternatively, a way to meta-refresh redirect if the referrer is Google but 301 redirect otherwise? Or is there a way to "noindex, nofollow" the redirect only if the referrer is Google? Is there a danger of being penalised for doing any of these things?
Late Edit: It occurs to me that if my penalties are algorithmic (e.g. due to bad backlinks), does 301 redirection even carry that issue through to the new website? Or is it left behind on the old site?