Unfortunately it's in Thai language, which I not understand.
Looking the video, it looks like trial and error.
Is there someone capable to solve this with logic?
8x8 jigsaw from youtube
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8x8 jigsaw from youtube
by urhegyi » Sun Dec 18, 2022 7:56 pm
I found this link on Youtube.https://www.youtube.com/watch?v=Id_a3X1SeY8
Unfortunately it's in Thai language, which I not understand.
Looking the video, it looks like trial and error.
Is there someone capable to solve this with logic?
Unfortunately it's in Thai language, which I not understand.
Looking the video, it looks like trial and error.
Is there someone capable to solve this with logic?
- urhegyi
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Re:
by urhegyi » Mon Dec 19, 2022 9:11 am
1to9only wrote:SE rates this as ED=7.9/1.5/1.5.
Meanwhile I solved it, but it's rather extremely hard. I looked for bivalue cells with only 2 possible candidates. Sometimes one of them wasn't possible because it emptied a region, so no placement was possible for this candidate or in another case it led to a contradiction with an already known given. So this bifurcation technique is actually a way of trial and error. I wondered if anyone could solve this with logic, probably with neater nichio chains.
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Re: Re:
by Hajime » Mon Dec 19, 2022 12:12 pm
urhegyi wrote:1to9only wrote:SE rates this as ED=7.9/1.5/1.5.
Meanwhile I solved it, but it's rather extremely hard. I looked for bivalue cells with only 2 possible candidates. Sometimes one of them wasn't possible because it emptied a region, so no placement was possible for this candidate or in another case it led to a contradiction with an already known given. So this bifurcation technique is actually a way of trial and error. I wondered if anyone could solve this with logic, probably with neater nichio chains.
urhegyi, your description how you solved the puzzle is the same as explained at
https://www.sudokuwiki.org/Nishio_Forcing_Chains Type 2 and type 4.
And ED=7.9 is the rating of a Nichio Forcing chain in Sudoku Explainer. So easier/neater methods may not be expected.
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Hajime - Posts: 1375
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Re: 8x8 jigsaw from youtube
by urhegyi » Mon Dec 19, 2022 2:32 pm
Actually with pencilmarks I needed 3 steps, 2 of them relatively easy to find. The third one which breaks the puzzle was a bit of luck, but after reviewing the logic it was clear an example of nishio where one of the values of a bivalue cell forces three digits in 3 cells and where another cell which sees those three cels is empty. Knowing the correct value, the rest of the puzzle solved with basics.
Now I'm curious to see if the solvepath of sudokuexplainer did it the same (or analog)way, or was completely different. All the ways led to Rome, but perheps the one a bit quicker then the other...
Now I'm curious to see if the solvepath of sudokuexplainer did it the same (or analog)way, or was completely different. All the ways led to Rome, but perheps the one a bit quicker then the other...
- urhegyi
- Posts: 748
- Joined: 13 April 2020
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