I have a wordpress blog which is on the #1 spot in Google for the main keyword. I've been contacted by another webmaster who's interested in the #1 position as well. If I use a 301 redirect on my domain, will it keep the #1 spot? Would it be a better idea to keep the original website and redirect to this other website after a visitor is 10-20sec on my website? Will this kind of redirect harm the SERP?