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Jan 21 VH

 
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ZeroAssoluto



Joined: 05 Feb 2017
Posts: 868
Location: Rimini, Italy

PostPosted: Thu Jan 21, 2021 9:20 am    Post subject: Jan 21 VH Reply with quote

Hi everyone,

Code:

+---------+-------------+----------+
| 1 3  6  | 8  4    57  | 57 9  2  |
| 8 4  29 | 27 2579 1   | 6  3  57 |
| 5 7  29 | 6  29   3   | 1  4  8  |
+---------+-------------+----------+
| 6 9  5  | 1  3    8   | 27 27 4  |
| 7 2  1  | 9  6    4   | 8  5  3  |
| 3 8  4  | 5  27   27  | 9  6  1  |
+---------+-------------+----------+
| 2 5  8  | 4  17   6   | 3  17 9  |
| 4 16 7  | 3  8    9   | 25 12 56 |
| 9 16 3  | 27 1257 257 | 4  8  67 |
+---------+-------------+----------+

Play this puzzle online at the Daily Sudoku site

UR 2,9 in r23c35 and -2 -9 in r2c5

Ciao Gianni


Last edited by ZeroAssoluto on Thu Jan 21, 2021 2:43 pm; edited 1 time in total
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dongrave



Joined: 06 Mar 2014
Posts: 563

PostPosted: Thu Jan 21, 2021 2:40 pm    Post subject: Reply with quote

Gianni! You have the wrong date in the title! Today's the 21st! Smile

To solve it using just standard VH moves I think you need to use the 7 X-Wing in columns 4 and 9 (-7r29c5 and -7r9c6) followed by the 57-2 XY-Wing in r19c6 and r2c4 (-2r9c4).
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ZeroAssoluto



Joined: 05 Feb 2017
Posts: 868
Location: Rimini, Italy

PostPosted: Thu Jan 21, 2021 2:46 pm    Post subject: Reply with quote

Fix

Gianni
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immpy



Joined: 06 May 2017
Posts: 570

PostPosted: Thu Jan 21, 2021 6:56 pm    Post subject: Reply with quote

And yet the UR (type 1) is simple enough to identify and implement.

cheers...immp
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immpy



Joined: 06 May 2017
Posts: 570

PostPosted: Thu Jan 21, 2021 6:57 pm    Post subject: Reply with quote

Saves a step as well.
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TomC



Joined: 30 Oct 2020
Posts: 349
Location: Wales

PostPosted: Thu Jan 21, 2021 7:01 pm    Post subject: Reply with quote

You don't need to use the X wing of 7 to solve

r2c4 <> 7 as this makes r1c6 = 5 and forces the UR of 29
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dongrave



Joined: 06 Mar 2014
Posts: 563

PostPosted: Fri Jan 22, 2021 12:03 pm    Post subject: Reply with quote

Yes, I saw the UR too. Years ago I asked Marty if the VH puzzles could be solved using just the standard 3 wings (i.e. X, XY, and XYZ) and UR's and he told me that they could all be solved with just the 3 wings so even though I think UR's are easier to find than most wings, I try to solve them using just the standard wings.

When I suggested to Marty that the solution using just the 3 wings be called the 'official' solution, he instead suggested we call it the 'standard' solution!
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