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 Author: Rob  [ Wed Oct 01, 2014 2:31 am ] Post subject: multiple solutions to 1-Oct-14, 4x4 Difficult? It appears to me that there are multiple solutions to the 4x4 difficult puzzle today.Here is what I have so far:It appears to me that the first row can be either 3412 or 4312 equally correctly.

 Author: apolaris  [ Wed Oct 01, 2014 2:56 am ] Post subject: Re: multiple solutions to 1-Oct-14, 4x4 Difficult? I found a similar problem:4 3 1 23 4 2 12 1 4 31 2 3 4and4 3 1 23 4 2 11 2 4 32 1 3 4are both equally valid solutions, yet both are being rejected as "incorrect" when submitted.3 4 1 24 2 3 12 1 4 31 3 2 4is being accepted as the solution, but it's nowhere near being the only one.

 Author: bram  [ Wed Oct 01, 2014 4:12 am ] Post subject: Re: multiple solutions to 1-Oct-14, 4x4 Difficult? Apart from four correct solutions with this arrangement of numbers in the right half of the puzzle:x x 1 2x x 2 1x x 4 3x x 3 4there is also this (fifth) correct solution:3 4 1 24 2 3 12 1 4 31 3 2 4On my system (latest Firefox version on Windows Vista SP2) all five solutions are accepted as correct when submitted.

 Author: calcpnm  [ Wed Oct 01, 2014 9:16 am ] Post subject: 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 bugintroduced in a more recent version of my solver I ran an old version of the solver (from July 2010 (!)) on this puzzle, and it foundall five solutions.Edit: found the bug, a fix for a problem which caused it to not be able to solve puzzleslarger than 15x15 (which I needed for the new book, which has one 17x17 puzzle) introduceda 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

 Author: clm  [ Wed Oct 01, 2014 10:30 am ] Post subject: Re: multiple solutions to 1-Oct-14, 4x4 Difficult? calcpnm wrote: ... I'm as far as having figured out that this is a bugintroduced in a more recent version of my solver I ran an old version of the solver (from July 2010 (!)) on this puzzle, and it foundall five solutions....PatrickIt was one possibility among 5, but I was so unlucky that only when I entered the fifth I got the 2 points .I was really surprised since it was the first time (IIRC) that I was seeing a violation of the "dogma" of the unicity, and thinking what would have happened in case of a 9x9, ... . I supposed most players were going to feel the same and find the solution given as correct by the program in a couple of minutes (the other four times the full grid was green but the program insisted in an "incorrect solution") and I was waiting until 24.00 CET today to talk about this bug (this time only 2 points, anyway ).

 Author: pnm  [ Wed Oct 01, 2014 10:44 am ] Post subject: Re: multiple solutions to 1-Oct-14, 4x4 Difficult? clm wrote:I supposed most players were going to feel the same and find the solution given as correct by the program in a couple of minutesYes, and every time this happens (a validated solution is submitted but rejected by the server) I geta warning message, to alert me of a potential bug.So this morning I had 400+ emails in my inbox Edit: and after exhaustively testing all October puzzles, I found that I have to replace five more 4x4 difficult puzzles(which had 3 or 5 solutions)

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