The person that has a post in this thread that occurred the greatest amount of time after the post immediately preceding it is the current winner.
DISCLAIMER: This game doesn't actually encourage necro. In fact, it discourages necro, as it encourages the current winner to post consistently and frequently so that others cannot post with a larger gap. Of course the winner who post after the thread's been dead for 13 days wins by default, because that's the max gap before rules are broken, but hell it won't get that close.
Good luck!