Robert Shimmin wrote on Mon, Jul 7, 2003 09:16 PM EDT:
Two towers of the same height is probably easiest to code into the ZRF, and
is probably best for keeping the checker population from getting out of
hand.
One other possibility that ocurred to me was that any two towers could be
used for promotion, but the new tower would be the height of the smaller
of the two.
Other thougths?