My memory may be extremely faulty of course, but was there not more than
one single solution for the 5x5? (Not unprecedented, I have one puzzle
that promises a single solution but there are hundreds.) And, is there
a solution for the 10x10? I seem to remember that there was (or I had)
a convincing argument that such a thing did not exist. I should go through
the lesser used parts of my memory one of these days.
dik t. winter, cwi, kruislaan 413, 1098 sj amsterdam, nederland
home: bovenover 215, 1025 jn amsterdam, nederland; e-mail: firstname.lastname@example.org