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ZeroAssoluto
Joined: 05 Feb 2017
Posts: 943
Location: Rimini, Italy
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 Posted: Thu Jan 21, 2021 9:20 am Post subject: Jan 21 VH |
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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 |
+---------+-------------+----------+
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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: 568
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| Posted: Thu Jan 21, 2021 2:40 pm Post subject: |
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Gianni! You have the wrong date in the title! Today's the 21st! 
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: 943
Location: Rimini, Italy
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| Posted: Thu Jan 21, 2021 2:46 pm Post subject: |
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Fix
Gianni |
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immpy
Joined: 06 May 2017
Posts: 571
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| Posted: Thu Jan 21, 2021 6:56 pm Post subject: |
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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: 571
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| Posted: Thu Jan 21, 2021 6:57 pm Post subject: |
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| Saves a step as well. |
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TomC
Joined: 30 Oct 2020
Posts: 358
Location: Wales
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| Posted: Thu Jan 21, 2021 7:01 pm Post subject: |
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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: 568
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| Posted: Fri Jan 22, 2021 12:03 pm Post subject: |
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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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