On Thu, 16 Dec 1993 Dik.Winter@cwi.nl wrote:

> 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.
For each Tangle, there are 2 solutions and no more. I have searched the
tree thoroughly and verified this. Counting 4 rotations and that 2 pieces
are identical, the total search gives 16 'solutions'.
The colourful little pamphlet that comes with the puzzle says that there
IS a solution to the 10*10 puzzle.