I support Dave's idea about the problems posted here. This page is reserved for the question. In this case, somebody in two months time won't have immediate spoilers. If you want to post a solution, create a separate page for the purpose. Just put a link between these lines.
/Attempts?
If your solution is wrong a refutation can be discussed on that separate page too.
I'm creating a page
/Solution?
which will be left empty for a week (it can be extended if the solution is not found during this time and there is some interest still). Then the final solution will be posted there.
There could be some interest in discussion of issues connected to the problem. What stones are important for the solution, what are not. Is this problem generic or not? All these discussions should be on separate pages.
I think that this kind of warning (edit it please) could be placed on every page with a problem.