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Jan 08 VH

 
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ZeroAssoluto



Joined: 05 Feb 2017
Posts: 685
Location: Rimini, Italy

PostPosted: Sat Jan 08, 2022 10:55 am    Post subject: Jan 08 VH Reply with quote

Hi everyone,

Code:

+--------+-------------+--------+
| 2 5 7  | 13  14  34  | 9  6 8 |
| 1 3 6  | 8   9   7   | 5  4 2 |
| 9 8 4  | 25  25  6   | 1  7 3 |
+--------+-------------+--------+
| 6 4 9  | 7   3   2   | 8  1 5 |
| 5 1 2  | 4   8   9   | 7  3 6 |
| 3 7 8  | 56  56  1   | 2  9 4 |
+--------+-------------+--------+
| 4 2 15 | 9   16  35  | 36 8 7 |
| 8 6 15 | 135 7   345 | 34 2 9 |
| 7 9 3  | 26  246 8   | 46 5 1 |
+--------+-------------+--------+

Play this puzzle online at the Daily Sudoku site

Quote:
XY-Wing
1,3,5 in r7c36,r8c4 and -1 in r7c5,r8c3
1,3,5 in r7c6,r8c34 and -5 in r7c3,r8c6
1,3,6 in r7c57,r8c4 and -3 in r7c6,r8c7
or
XYZ-Wing 3,4,5 in r7c6,r8c67 and -3 in r8c4
or
W-Wing 3,4 in r1c6,r8c7 SL with number 3 in r7c67 and -4 in r8c6


Ciao Gianni
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TomC



Joined: 30 Oct 2020
Posts: 227
Location: Wales

PostPosted: Sat Jan 08, 2022 1:44 pm    Post subject: Reply with quote

Gianni, is there not another basic move needed before the XY wings will work?
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dongrave



Joined: 06 Mar 2014
Posts: 476

PostPosted: Sat Jan 08, 2022 1:55 pm    Post subject: Reply with quote

I think so Tom. There are 5's locked candidates in column 6 removing the 5 from r8c4. (Or you could use the hidden pair 1-3 in column 4 or the 256 naked triple in the same column.)
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ZeroAssoluto



Joined: 05 Feb 2017
Posts: 685
Location: Rimini, Italy

PostPosted: Sat Jan 08, 2022 3:41 pm    Post subject: Reply with quote

Yes,
the 5 in r8c4 had to be eliminated.
My usual issues with "auto sweep" when using the smartphone.

Ciao Gianni
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TomC



Joined: 30 Oct 2020
Posts: 227
Location: Wales

PostPosted: Sat Jan 08, 2022 3:51 pm    Post subject: Reply with quote

Another way to solve is by the nearly <26> pair in r9

If r9c7=4, <26> pair gives r7c5=1, r8c4=3, r8c7= also 4!

r9c7 must be <6>
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TomC



Joined: 30 Oct 2020
Posts: 227
Location: Wales

PostPosted: Sat Jan 08, 2022 4:54 pm    Post subject: Reply with quote

or pincers on <6> in r7c5 and r9c7 gives -6 in r9c45 and r7c7
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Mogulmeister



Joined: 03 May 2007
Posts: 1136

PostPosted: Mon Jan 10, 2022 11:16 am    Post subject: Reply with quote

There's a rare (in my experience anyway) extended Unique Rectangle (2 x 3) at
r369c45 [25-56-26]. Essentially, to break the deadly pattern r9c5 has to be 4 so eliminating <26>.
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