By the way, I'm actually away for a couple of days, so if you break it, it won't get fixed for a while. (On the other hand, this gives you some opportunities to try breaking it!)
Cheers all. Glad the whole thing hasn't (yet) fallen on its arse. [Watty] Next on my list is some sort of admin tool for precisely this purpose. In the meantime, I suggest setting the winning move to something unguessable.