Can not find solving path

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Can not find solving path

Postby shamath » Sun Dec 23, 2018 10:58 am

Hi,

I am stuck with this and I know there are X-wing and other solutions but I cannot recognize them. Can you help me how to find which are pointing pairs and wings? Most of the sites I read about techniques use easy examples and do not really explain how to find them.

Thanks in advance.

http://forum.enjoysudoku.com/download/file.php?mode=view&id=1370
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shamath
 
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Joined: 31 July 2018

Re: Can not find solving path

Postby 999_Springs » Sun Dec 23, 2018 11:28 am

where can you put a 1 in block 3?

what does this tell you about the rest of the 1's in a particular column?

that should take you to the end
Once upon a time I was a teenager who was active on here 2007-2011
ocean and eleven should have paired up to make a sudoku-solving duo called Ocean's Eleven
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Location: In the toilet, flushing down springs, one by one.

Re: Can not find solving path

Postby eleven » Sun Dec 23, 2018 11:43 am

There is a hidden pair 13 in box 3.
You can see 13 in row 1 and column 9, leaving only the 2 cells r23c7 (marked x) in box 3 for them. So they must be there, and you can eliminate the other candidates from the2 cells, and all 13's in the rest of column 7.
Code: Select all
 +-------+-------+-------+
 | 3*7 1*| 2 . 6 | 5 - - |
 | 8 6 4 | . . 5 | x 2 - |
 | 9 2 5 | . . 4 | x 6 - |
 +-------+-------+-------+
 | 4 1 7 | 5 . . | 6 3 2 |
 | 6 9 8 | . 2 . | . 5 . |
 | 5 3 2 | 6 4 7 | 9 8 1*|
 +-------+-------+-------+
 | 2 5 . | 7 . . | . . 3*|
 | 7 4 . | . 5 2 | . . 6 |
 | 1 8 . | 4 . . | 2 7 5 |
 +-------+-------+-------+

Yes, in this case it would have been sufficient to see, that 1 is restricted to the 2 cells, and can't be in r8c7.
eleven
 
Posts: 1999
Joined: 10 February 2008

Re: Can not find solving path

Postby shamath » Sun Dec 23, 2018 12:40 pm

eleven wrote:There is a hidden pair 13 in box 3.
You can see 13 in row 1 and column 9, leaving only the 2 cells r23c7 (marked x) in box 3 for them. So they must be there, and you can eliminate the other candidates from the2 cells, and all 13's in the rest of column 7.
Code: Select all
 +-------+-------+-------+
 | 3*7 1*| 2 . 6 | 5 - - |
 | 8 6 4 | . . 5 | x 2 - |
 | 9 2 5 | . . 4 | x 6 - |
 +-------+-------+-------+
 | 4 1 7 | 5 . . | 6 3 2 |
 | 6 9 8 | . 2 . | . 5 . |
 | 5 3 2 | 6 4 7 | 9 8 1*|
 +-------+-------+-------+
 | 2 5 . | 7 . . | . . 3*|
 | 7 4 . | . 5 2 | . . 6 |
 | 1 8 . | 4 . . | 2 7 5 |
 +-------+-------+-------+

Yes, in this case it would have been sufficient to see, that 1 is restricted to the 2 cells, and can't be in r8c7.


Thanks, I can see now. Appreciate your help.
shamath
 
Posts: 5
Joined: 31 July 2018


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