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Dec 22 VH

 
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hughwill



Joined: 05 Apr 2010
Posts: 422
Location: Birmingham UK

PostPosted: Tue Dec 22, 2015 11:45 am    Post subject: Dec 22 VH Reply with quote

Code:

+-----------+-------------+-----------+
| 4  9  7   | 356  8  35  | 2  356 1  |
| 2  5  6   | 139  4  139 | 39 8   7  |
| 1  8  3   | 569  2  7   | 59 56  4  |
+-----------+-------------+-----------+
| 69 7  12  | 59   13 4   | 8  35  26 |
| 3  4  5   | 28   6  28  | 1  7   9  |
| 69 12 8   | 7    13 59  | 35 4   26 |
+-----------+-------------+-----------+
| 5  12 124 | 1248 7  128 | 6  9   3  |
| 7  6  9   | 13   5  13  | 4  2   8  |
| 8  3  24  | 24   9  6   | 7  1   5  |
+-----------+-------------+-----------+

Play this puzzle online at the Daily Sudoku site

One step:
Quote:
35-9 XYwing pivot r6c7)
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the_lock_man



Joined: 18 Dec 2012
Posts: 40
Location: Portsmarfff, UK

PostPosted: Tue Dec 22, 2015 12:26 pm    Post subject: Reply with quote

I used what I think is a W-Wing.

The pincer cells are the "35" in R1C6 and R4C8, strong link on 5 in box 5, and it sets R1C8<>3. Everything is basics from thereon in.
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Marty R.



Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA

PostPosted: Tue Dec 22, 2015 1:36 pm    Post subject: Reply with quote

the_lock_man wrote:
I used what I think is a W-Wing.

The pincer cells are the "35" in R1C6 and R4C8, strong link on 5 in box 5, and it sets R1C8<>3. Everything is basics from thereon in.


Yes, it's a W-Wing. Good job spotting that strong link. Strong links are harder to spot in boxes than rows and columns, at least for me they are. When I looked at the two 35 cells I saw the strong link in column 4.
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dongrave



Joined: 06 Mar 2014
Posts: 563

PostPosted: Wed Dec 23, 2015 2:04 am    Post subject: Reply with quote

I had the same solution as Hugh again - but I wanted to mention that r7c46 in his diagram can't be 1 because of the naked 13 pair in box 8 (or the locked 1's in box 7) and that opens up the (useless) 28 UR type 1. At least the 13 UR type 2 looks like it solves it - but I doubt any serious person would use it.

Hey! By the way, the H streak lives on! And if we get an H tomorrow, that'll make 12 in a row from the beginning of the month! None of us will probably be around to ever see another 11 in a row from the beginning of a month - for any difficulty level - provided of course that Sam didn't cut corners on his 'random number' generator. If anyone out there wants me to bore them to death with the odds, let me know!
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