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today's difficult Killer Sudoku has more than one solution https://www.calcudoku.org/forum/viewtopic.php?f=19&t=299 
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Author:  pnm [ Sat Aug 18, 2012 12:05 pm ] 
Post subject:  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 
Author:  fzpowerman47 [ Sat Aug 18, 2012 4:19 pm ] 
Post subject:  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 ?? 
Author:  pnm [ Sat Aug 18, 2012 4:48 pm ] 
Post subject:  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 sent you email about this as soon as your solution came in (about 1 hour and 40 minutes ago). I also put a message on the page itself: http://www.calcudoku.org/killersudoku/en/20120818/9/3 and posted about the problem earlier: viewtopic.php?f=19&t=299 Patrick 
Author:  pharosian [ Sat Aug 18, 2012 9:00 pm ] 
Post subject:  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 a5b5 and a9b9 appeared to be 6 and 8, signaling a nonunique 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 ab5 and ab9. Glad to know I wasn't delusional when I thought there was something wrong with this one! 
Author:  pnm [ Sat Aug 18, 2012 10:50 pm ] 
Post subject:  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 a5b5 and a9b9 appeared to be 6 and 8, signaling a nonunique 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 ab5 and ab9. 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 
Author:  pharosian [ Sat Aug 18, 2012 11:29 pm ] 
Post subject:  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. 
Author:  pnm [ Sun Aug 19, 2012 12:06 am ] 
Post subject:  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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