I'd like to know why this answer was deleted by a moderator. It doesn't answer the question completely, but it goes a long way towards answering it. Answers such as this that report on substantial progress without resolving the issue are standard on the site; I've never seen one deleted before. I'm wondering whether it has something to with the question being put on hold as “missing context or other details”, but I'm not aware of any rule that would allow (or even require) a moderator to delete an answer because the question has been put on hold. What was the basis of this deletion?