anti-virus is alive and well; and in my view the best sliding piece puzzle ever!

Try to count the number of legal positions in the game of Go, as described on http://www.cwi.nl/~tromp/go/le... How much memory is available per machine?

When reading the description of a bundle of laser beams guiding a central one, I can't help but think of a ladder evolving in the game of Go... http://en.wikipedia.org/wiki/L...