Ben Reiniger wrote on Sat, Oct 23, 2010 02:42 PM UTC:
Oops, that triangular-edge comment was mistaken. An edge has 10 adjacent
edges! There are the four 'closest' ones and the two weird ones I
mentioned, but there are also four more, between the first four and the
weird two. So I guess playing on edges purely by adjacency can create
weird games...