Stuck on Sudoku (Berliner Kurier 21/02/13)

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Stuck on Sudoku (Berliner Kurier 21/02/13)

Postby Gero » Mon Feb 15, 2021 3:55 pm

Hi everyone,

I'm new to the forum. Until now I was able to solve every hard Sudoku that I tried, but now I am stuck on this one. I never learned any solving technique by hard, for this one I looked into the advanced techniques, but they all seemed like kind of what I am already applying. Of course I could be bruteforcing it, but I hope to find a more elegant method.
It would be great if someone could tell me what a next step in this state is.
Image
Thanks in advance
Gero
Gero
 
Posts: 2
Joined: 15 February 2021

Re: Stuck on Sudoku (Berliner Kurier 21/02/13)

Postby jco » Mon Feb 15, 2021 9:00 pm

Hello Gero,
You have a strong link of 1s in row 2. If r3c2 is not 7, then it can only be 1, so r2c2 cannot be 1, so that r2c6 has to be 1. If r2c6 is 1, r1c5 has to be 7. So, r1c2 cannot be seven, if r3c2 is not 7. Of course, the same happens if r3c2 = 7, so 7 is false in r1c2. As a by-product r3c6 also cannot be 7.
This is the so-called W-wing. After this you need to find a skyscraper on 7.
Regards,
jco
Last edited by jco on Thu Feb 18, 2021 10:11 am, edited 1 time in total.
JCO
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Posts: 93
Joined: 09 June 2020

Re: Stuck on Sudoku (Berliner Kurier 21/02/13)

Postby Gero » Wed Feb 17, 2021 2:25 pm

Hi jco,
thanks a lot for the well explained answer. With this tip I was able to solve the puzzle.
Best regards,
Gero
Gero
 
Posts: 2
Joined: 15 February 2021

Re: Stuck on Sudoku (Berliner Kurier 21/02/13)

Postby jco » Thu Feb 18, 2021 11:31 am

Hello Gero,

Thanks for the feedback. That was a good puzzle. From your message and very accurate markings, I knew that you would finish it quickly.

Best regards,
jco.
JCO
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Posts: 93
Joined: 09 June 2020


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