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Jun 05 VH

 
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ZeroAssoluto



Joined: 05 Feb 2017
Posts: 942
Location: Rimini, Italy
PostPosted: Sun Jun 05, 2022 8:50 am    Post subject: Jun 05 VH Reply with quote
Hi everyone,

Code:

+----------+--------------+------------+
| 5  68  2 | 17   3   9   | 4  178 167 |
| 1  36  4 | 27   5   278 | 9  78  36  |
| 9  38  7 | 6    18  4   | 5  2   13  |
+----------+--------------+------------+
| 4  279 5 | 3    29  27  | 1  6   8   |
| 3  79  1 | 8    6   5   | 2  79  4   |
| 6  279 8 | 2479 249 1   | 37 379 5   |
+----------+--------------+------------+
| 27 4   6 | 129  129 3   | 8  5   17  |
| 78 5   9 | 14   148 6   | 37 137 2   |
| 28 1   3 | 5    7   28  | 6  4   9   |
+----------+--------------+------------+

Play this puzzle online at the Daily Sudoku site

Quote:
XYZ-Wing 1,7,8 in r1c48,r2c8 and -7 in r1c9
or
W-Wing 1,7 in r1c4,r7c9 SL with number 1 in r3c59 (or r18c8) and -7 in r1c9


Ciao Gianni
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TomC



Joined: 30 Oct 2020
Posts: 358
Location: Wales
PostPosted: Sun Jun 05, 2022 10:59 am    Post subject: Reply with quote
Just an observation, but a=1 to solve
Code:

+-----------+----------------+-------------+
| 5   68  2 |  17    3   9   | 4  178  167 |
| 1   36  4 |  27    5   278 | 9  78   36  |
| 9  b38  7 |  6    a18  4   | 5  2   c13  |
+-----------+----------------+-------------+
| 4   279 5 |  3     29  27  | 1  6    8   |
| 3   79  1 |  8     6   5   | 2  79   4   |
| 6   279 8 |  2479  249 1   | 37 379  5   |
+-----------+----------------+-------------+
| 27  4   6 |  129   129 3   | 8  5   x17  |
| 78  5   9 | e14   e148 6   | 37 137  2   |
| 28  1   3 |  5     7   28  | 6  4    9   |
+-----------+----------------+-------------+

If a=8, c=1  gives x=7
If a=8, e=14 then  x=1

The <148> XYZ in aee drew my eye to this contradiction
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Earl



Joined: 30 May 2007
Posts: 677
Location: Victoria, KS
PostPosted: Sun Jun 05, 2022 2:29 pm    Post subject: Jun05VH Reply with quote
Should not that xyzwing be 148?


Early Earl
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dongrave



Joined: 06 Mar 2014
Posts: 568
PostPosted: Sun Jun 05, 2022 5:09 pm    Post subject: Reply with quote
I don't think the 148 XYZ Wing solves the puzzle Earl but the 178 XYZ Wing looks like it does.
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TomC



Joined: 30 Oct 2020
Posts: 358
Location: Wales
PostPosted: Sun Jun 05, 2022 5:22 pm    Post subject: Reply with quote
Correct, the XYZ 148 doesn't solve it straight away, you would need another step

You could look at my contradiction as a chain :

If a=8, e=14, x=1, c=3, b=8, a=1 so a is not 8 and must be 1
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glesco



Joined: 12 May 2022
Posts: 36
PostPosted: Tue Jun 07, 2022 6:54 pm    Post subject: Reply with quote
W-wing (17 with 1s on row 3) removes 7 from r1c9. stte
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