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.
I note also this site is unusable under Netscape 4.76. It makes a really crap job of the CSS rendering this box I'm typing into completely unusable. I'll think of a fix before unleashing this on a more general public,
For some reason, the option for Crescent a l'orange on the "new game" page wasn't being honoured. I think it is now. In any case, move headings have been added to this banter page. In principle, this (and the long game) should also be unwinnable.