Re: multiple solutions to 1-Oct-14, 4x4 Difficult?
Thanks for letting me know. I'm as far as having figured out that this is a bug
introduced in a more recent version of my solver
I ran an old version of the solver (from July 2010 (!)) on this puzzle, and it found
all five solutions.
Edit: found the bug, a fix for a problem which caused it to not be able to solve puzzles
larger than 15x15 (which I needed for the new book, which has one 17x17 puzzle) introduced
a new bug for puzzles with cages larger than 5 cells
Challenge to you all: how to modify the current puzzle so only this solution:
Code:
3 4 1 2
4 2 3 1
2 1 4 3
1 3 2 4
is valid??
Edit #2: I changed the puzzle a bit so the above is a single valid solution.
Patrick