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Unsolvable 5x5? http://www.calcudoku.org/forum/viewtopic.php?f=17&t=818 
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Author:  paulv66 [ Fri Aug 05, 2016 12:15 am ] 
Post subject:  Unsolvable 5x5? 
I got interrupted doing my first 5x5 yesterday and I got what seemed to me an unsolvable puzzle next time round. I've taken a screenshot of the puzzle. How do I go about posting it here? 
Author:  jaek [ Fri Aug 05, 2016 4:04 am ] 
Post subject:  Re: Unsolvable 5x5? 
paulv66 wrote: I got interrupted doing my first 5x5 yesterday and I got what seemed to me an unsolvable puzzle next time round. I've taken a screenshot of the puzzle. How do I go about posting it here? You can upload it to imgur.com without opening an account/setting up a profile, etc. I think there is an upload option in the nav options across the top of the page. Then you can post the link here. 
Author:  paulv66 [ Fri Aug 05, 2016 6:10 am ] 
Post subject:  Re: Unsolvable 5x5? 
jaek wrote: paulv66 wrote: I got interrupted doing my first 5x5 yesterday and I got what seemed to me an unsolvable puzzle next time round. I've taken a screenshot of the puzzle. How do I go about posting it here? You can upload it to imgur.com without opening an account/setting up a profile, etc. I think there is an upload option in the nav options across the top of the page. Then you can post the link here. Thanks. I don't seem to be able to locate the nav options. Where exactly are they? 
Author:  pnm [ Fri Aug 05, 2016 8:00 am ] 
Post subject:  Re: Unsolvable 5x5? 
paulv66 wrote: I got interrupted doing my first 5x5 yesterday and I got what seemed to me an unsolvable puzzle next time round. I've taken a screenshot of the puzzle. How do I go about posting it here? You could also send me the screenshot and I'll add it to the post. 
Author:  paulv66 [ Fri Aug 05, 2016 10:38 am ] 
Post subject:  Re: Unsolvable 5x5? 
pnm wrote: paulv66 wrote: I got interrupted doing my first 5x5 yesterday and I got what seemed to me an unsolvable puzzle next time round. I've taken a screenshot of the puzzle. How do I go about posting it here? You could also send me the screenshot and I'll add it to the post. Thanks Patrick Do you have an email address I can send it to? I can't figure out how to send it as an attachment to a PM. 
Author:  pnm [ Fri Aug 05, 2016 11:27 am ] 
Post subject:  Re: Unsolvable 5x5? 
paulv66 wrote: Do you have an email address I can send it to? I can't figure out how to send it as an attachment to a PM. I'm guessing there's an email address somewhere on the main puzzle page 
Author:  paulv66 [ Fri Aug 05, 2016 3:27 pm ] 
Post subject:  Re: Unsolvable 5x5? 
pnm wrote: paulv66 wrote: Do you have an email address I can send it to? I can't figure out how to send it as an attachment to a PM. I'm guessing there's an email address somewhere on the main puzzle page Sorry, not very alert today. I've send an email. Thanks Paul 
Author:  pnm [ Fri Aug 05, 2016 3:43 pm ] 
Post subject:  Re: Unsolvable 5x5? 
paulv66 wrote: Sorry, not very alert today. I've send an email. Thanks. Here's the puzzle: and the reasoning: paulv66 wrote: My reasoning is as follows. The 3: cell must be 1,3. It follows from this that the 3 cell must be 2,5 and e5 must be 4. The\ 40x cell must be 2,4,5. Therefore a4 and b4 must be 1,3. A4 is in a 12+ cell and therefore must be 3. But a5 and b5 must t\ hen be 4,5 which is impossible because e5 is 4. Where am I going wrong? 5 points for the first one to spot the flaw 
Author:  wjm [ Fri Aug 05, 2016 4:19 pm ] 
Post subject:  Re: Unsolvable 5x5? 
Hello Patrick and paulv66! The error in the enclosed analysis is that the 40x cage consists of 4 cells, not 3! Since there is already a 4 ar e4, one of the remaining 3 cells must have a 1 in it. This will allow a 4 to be placed at a4 with a 3 and a 5 at positions a5 and b5. (It was always a given that it would be solvable!) wjm 
Author:  paulv66 [ Fri Aug 05, 2016 5:20 pm ] 
Post subject:  Re: Unsolvable 5x5? 
wjm wrote: Hello Patrick and paulv66! The error in the enclosed analysis is that the 40x cage consists of 4 cells, not 3! Since there is already a 4 ar e4, one of the remaining 3 cells must have a 1 in it. This will allow a 4 to be placed at a4 with a 3 and a 5 at positions a5 and b5. (It was always a given that it would be solvable!) wjm Thanks! I'm such an idiot. I somehow or other got it into into my head that e5 was a single cell and the 40x was the other 3 cells. I also need to stop saying cell when I mean cage! 
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