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today's difficult Killer Sudoku has more than one solution
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Posted on: Sat Aug 18, 2012 12:05 pm

Posts: 2246
Joined: Thu May 12, 2011 11:58 pm
today's difficult Killer Sudoku has more than one solution
Unfortunately it appears that today's 9x9 difficult has more
than one solution

Just so people don't get stuck on the "wrong" solution:
the one that's stored in the database has an 8 on c1,
a 6 on f1, and a 2 on i8.

I'll try to fix this ASAP..

Patrick

Posted on: Sat Aug 18, 2012 4:19 pm

Posts: 5
Joined: Fri May 13, 2011 1:16 am
Re: Extra puzzles
why this solution is not correct for extra difficult puzzle of 18 august 2012?
518796423
936482157
742153986
259674318
681935274
374821695
123568749
495317862
867249531
there is more one solution ??

Posted on: Sat Aug 18, 2012 4:48 pm

Posts: 2246
Joined: Thu May 12, 2011 11:58 pm
Re: Extra puzzles
fzpowerman47 wrote:
why this solution is not correct for extra difficult puzzle of 18 august 2012?
518796423
936482157
742153986
259674318
681935274
374821695
123568749
495317862
867249531
there is more one solution ??

You mean the killer sudoku (not today's extra puzzle)?

I also put a message on the page itself: http://www.calcudoku.org/killersudoku/en/2012-08-18/9/3

and posted about the problem earlier: viewtopic.php?f=19&t=299

Patrick

Posted on: Sat Aug 18, 2012 9:00 pm

Posts: 116
Joined: Sat May 14, 2011 3:18 am
Re: today's difficult Killer Sudoku has more than one soluti
pnm wrote:
Unfortunately it appears that today's 9x9 difficult has more
than one solution

Just so people don't get stuck on the "wrong" solution:
the one that's stored in the database has an 8 on c1,
a 6 on f1, and a 2 on i8.

I'll try to fix this ASAP..

Patrick

I struggled with this one earlier today before giving up for a while to do something else. On reading this thread, I put the values stated above into my grid (I already had the 2 and knew f1 was either 6 or 8) and quickly finished it... but I got the ERROR message, saying my solution was incorrect. Comparing my solution to fzpowerman47's, I see we got the same solution.

Part of the reason I struggled earlier is that I saw that the pairs at a5-b5 and a9-b9 appeared to be 6 and 8, signaling a non-unique solution. So I tried to find a different way around it without success. The values at c1, f1, and i8 don't help to resolve the deadlock at a-b5 and ab-9.

Glad to know I wasn't delusional when I thought there was something wrong with this one!

Posted on: Sat Aug 18, 2012 10:50 pm

Posts: 2246
Joined: Thu May 12, 2011 11:58 pm
Re: today's difficult Killer Sudoku has more than one soluti
pharosian wrote:
Part of the reason I struggled earlier is that I saw that the pairs at a5-b5 and a9-b9 appeared to be 6 and 8, signaling a non-unique solution. So I tried to find a different way around it without success. The values at c1, f1, and i8 don't help to resolve the deadlock at a-b5 and ab-9.

I just gave a few values in the "cycles" that I saw.

The last two rows:
495317862
867249531

In any case, I sent the database solution to anyone who submitted a solution
(I get a warning message here when a supposedly incorrect solution is
submitted for a puzzle).

Now I've got about an hour to fix the problem, or I'll probably have to
remove tomorrow's Killer Sudokus just in case.. :(

Patrick

Posted on: Sat Aug 18, 2012 11:29 pm

Posts: 116
Joined: Sat May 14, 2011 3:18 am
Re: today's difficult Killer Sudoku has more than one soluti
Thanks for sending the solution, Patrick!

It turns out the correct solution actually has a 6 at c1 and an 8 at f1, not the other way around.

Posted on: Sun Aug 19, 2012 12:06 am

Posts: 2246
Joined: Thu May 12, 2011 11:58 pm
Re: today's difficult Killer Sudoku has more than one soluti
pharosian wrote:
It turns out the correct solution actually has a 6 at c1 and an 8 at f1, not the other way around.

Ah...

Today's (19th) also had more than one solution
(three in fact), so I removed it to avoid the same issue.

Patrick

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