Sudokus of Shame

Everything about Sudoku that doesn't fit in one of the other sections

Re: Sudokus of Shame

Postby Botchee » Fri Jun 22, 2012 10:03 pm

Oh yes ... the non-unique solution haunts me to this day as something discovered to late. Having hired someone to code a new shape of Sudoku, I was excited to pay the guy for what I thought was excellent work. Having paid and exchanged excellent ratings on rentacoder we each went our separate ways. Only later did I discover my lack of due diligence, and there was no recourse or help available, as the coder went unresponsive and I tired of daily checks and fixes of the generated puzzles.

Turns out the new (24 tiles or cells as you call them here) shape wasn't that challenging when solved like a standard Sudoku. Years later I have began to revive the idea as an interactive game, but that is a tale for another thread. You may experience the original flawed program at http://TopHatSudoku.com

The practice puzzles all have unique solutions and a printout is available at http://Botchee.com

This site looks great, and I will post more once I've had a chance to look around :)
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Re: Sudokus of Shame

Postby 999_Springs » Wed Sep 11, 2013 9:01 pm

i got bored and went to sudoku.com for the first time ever. the very first puzzle they gave me was this

multiple solution sudoku.png
multiple solution sudoku.png (241.95 KiB) Viewed 1051 times
Hidden Text: Show
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re: sudoku.com

Postby Pat » Tue Sep 24, 2013 8:46 am


    seems systematic,
    sudoku.com "Expert" level
    removes too many givens
    (always leaving 15, cute)

    EDIT: but, did they ever promise exactly-1-answer ?
    apparently not,
    so we have no right to complain---

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goplaysudoku.com

Postby Pat » Wed Sep 16, 2015 8:59 am

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Re: Sudokus of Shame

Postby ghfick » Mon May 09, 2016 2:17 am

The 'published' puzzle does indeed have multiple solutions. I suggest, in my response, that the trouble is a typographical one. I wonder how often this is the real issue in published puzzles.

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Re: Sudokus of Shame

Postby enxio27 » Mon May 09, 2016 2:16 pm

ghfick wrote:The 'published' puzzle does indeed have multiple solutions. I suggest, in my response, that the trouble is a typographical one. I wonder how often this is the real issue in published puzzles.

I doubt it. Far too many people who fancied themselves programmers jumped on the sudoku bandwagon when it got popular, even though they themselves had no clue about what a sudoku puzzle should look like or how they are constructed. As a result, there are/were many sites and apps out there that generate sudoku-like objects that don't qualify as real sudoku. Witness the number of pages in this thread, all containing invalid puzzles or sites that produce invalid puzzles.
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1465 77 multi-solutions

Postby doug9694 » Mon Jun 20, 2016 3:56 pm

I started working on solving the 1465 #77. Found on this site evidence of multiple solutions that should have put this puzzle In this thread back in 2006.
Instead, there was thread after thread of ways too solve this bogus puzzle. Did they not have a good way of determining un-uniqueness in 2006-8?
Then, as someone commented in 2009, that interest in this puzzle dropped. No reason given.

7.....4...2..7..8...3..8..9...5..3...6..2..9...1..7..6...3..9...3..4..6...9..1..5 SER 9.8
from the Top 1465 list
the-toughest-known-puzzle-t3827-15.html

+-------+-------+-------+
| 7 9 8 | 6 3 5 | 4 2 1 | Two solutotions??
| 1 2 6 | 9 7 4 | 5 8 3 | Postby keith » Tue May 30, 2006 9:14 pm
| 4 5 3 | 2 1 8 | 6 7 9 |
+-------+-------+-------+
| 9 7 2 | 5 8 6 | 3 1 4 |
| 5 6 4 | 1 2 3 | 8 9 7 |
| 3 8 1 | 4 9 7 | 2 5 6 |
+-------+-------+-------+
| 6 1 7 | 3 5 2 | 9 4 8 |
| 8 3 5 | 7 4 9 | 1 6 2 |
| 2 4 9 | 8 6 1 | 7 3 5 |
+-------+-------+-------+

786 912 453
925 473 681
143 658 729 Postby Alain David » Tue May 30, 2006 8:05 pm
284 596 317
367 124 598
951 837 246
612 385 974
538 749 162
479 261 835

Perhaps no one else saw this "other solution"??
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Re: Sudokus of Shame

Postby pjb » Tue Jun 21, 2016 6:40 am

The puzzle has only one solution - the first. The second above has 2 9s in column 1
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re: #77

Postby Pat » Wed Jun 22, 2016 12:40 pm

pjb wrote:The puzzle has only one solution - the first. The second above has 2 9s in column 1

you are amazingly patient

    keith (2006.May.30) already said it

      doug9694 managed to mis-read the very post from which he quoted
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Re: Sudokus of Shame

Postby Leren » Thu Jun 23, 2016 10:22 am

I can't resist this. The bogus solution has two 9's and no 8 in Column 1 and two 8's and no 9 in Column 2. Apart from that all rows, columns and boxes conform, unless I've missed something.

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