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May 31 VH

 
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ZeroAssoluto



Joined: 05 Feb 2017
Posts: 941
Location: Rimini, Italy
PostPosted: Tue May 31, 2022 1:17 pm    Post subject: May 31 VH Reply with quote
Hi everyone,

Code:

+-----------+-------+------------+
| 9   5  8  | 4 3 6 | 2  7  1    |
| 236 13 12 | 9 7 8 | 4  5  36   |
| 36  4  7  | 2 1 5 | 69 89 3689 |
+-----------+-------+------------+
| 7   9  5  | 1 6 2 | 8  3  4    |
| 1   8  6  | 3 5 4 | 7  29 29   |
| 4   2  3  | 7 8 9 | 1  6  5    |
+-----------+-------+------------+
| 23  37 9  | 6 4 1 | 5  28 278  |
| 5   67 4  | 8 2 3 | 69 1  679  |
| 8   16 12 | 5 9 7 | 3  4  26   |
+-----------+-------+------------+

Play this puzzle online at the Daily Sudoku site

Quote:
XY-Wing
1,3,6 in r2c29,r9c2 and -6 in r9c9
2,6,9 in r59c9,r8c7 and -9 in r8c9


Ciao Gianni
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TomC



Joined: 30 Oct 2020
Posts: 358
Location: Wales
PostPosted: Tue May 31, 2022 2:23 pm    Post subject: Reply with quote
I was drawn to a potential 23-6 XY wing (abc)

Not to be, but if x=2, a + c would both be <6> and lead to a contradiction

so r7c8=8 to solve

Code:

+------------+-------+---------------+
|  9   5  8  | 4 3 6 |  2   7   1    |
|  236 13 12 | 9 7 8 |  4   5  *36   |
| a36  4  7  | 2 1 5 | *69  89 *3689 |
+------------+-------+---------------+
|  7   9  5  | 1 6 2 |  8   3   4    |
|  1   8  6  | 3 5 4 |  7   29  29   |
|  4   2  3  | 7 8 9 |  1   6   5    |
+------------+-------+---------------+
| b23  37 9  | 6 4 1 |  5  x28 x278  |
|  5   67 4  | 8 2 3 |  69  1   679  |
|  8   16 12 | 5 9 7 |  3   4  c26   |
+------------+-------+---------------+

If x=2, c=6 also b=3, a=6 leads to no <6>'s in box 3 *


As a chain I think it would be:

(8=2)r7c8-(2=6)r9c9-(9=6)r3c7-(6=3)r3c1-(3=2)r7c1-(2=8)r7c8

r7c8 <> 2 to solve
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glesco



Joined: 12 May 2022
Posts: 36
PostPosted: Tue Jun 07, 2022 10:28 pm    Post subject: Reply with quote
269 xy-wing which eliminates 9 at r8c9. stte from there.
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