This is something I've been turning over in my head for a few months now, and I thought I would throw the question open for discussion on here.
The board is often flush with discussion of how the Germans could achieve fast victory on the Western Front in the First World War, but I don't remember seeing the reverse done. Is there any possibility of the Allies achieving a quick victory (i.e. before the end of 1915 at the latest) over the Germans? I've tried to come up with scenarios were it might have happened, but I've struggled, barring a combination of unlikely outcomes, so I'd be interested in seeing if anyone else has something to suggest.