stuck

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stuck

Postby Drjay » Thu Jul 30, 2015 11:31 pm

Hello friends!

I started solving Sudokus some days ago, after solving some harder ones I finally found one that I cant easily finish :

http://i.imgur.com/1AvyHno.png

Don't get confused by my exclamation marks, it's just my habit to signalize 2-candidate-only fields like that.

Are the 3 fields I marked with the circle a xyz-wing? If no, how can I solve the Sudoku?

Thanks in advance!
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Re: stuck

Postby JasonLion » Fri Jul 31, 2015 4:22 pm

Code: Select all
51476398298.5.4........8....2..51...6....7.131..38624....17532....6.9.577..8.269.


That puzzle can be solved with singles from that point. Starting with a naked single in column 7.

The marked cells could be considered an XYZ-Wing in some sense. However, they could never have any eliminations since they all share a block. Because of that they would not normally ever be called an XYZ-Wing.
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Re: stuck

Postby Drjay » Fri Jul 31, 2015 6:03 pm

Thanks for the reply but I don't understand why r4c7 is a naked single since r4c8 has 7 as a candidate as well, could you explain it please?
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Re: stuck

Postby JasonLion » Fri Jul 31, 2015 7:58 pm

I didn't say that R4C7 is a naked single, and it is not.

There is only a single cell in column 7 that can contain a 4. Since no other cell in column 7 can contain a 4, R3C7 must be 4.
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Re: stuck

Postby Drjay » Fri Jul 31, 2015 10:36 pm

Yeah my bad, I was focused on the 7. You helped me a lot, thanks!
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