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Jul 27 VH

 
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ZeroAssoluto



Joined: 05 Feb 2017
Posts: 940
Location: Rimini, Italy
PostPosted: Wed Jul 27, 2022 9:05 am    Post subject: Jul 27 VH Reply with quote
Hi everyone,

Code:

+------------+------------+------------+
| 128 125 28 | 245 259 7  | 459 3   6  |
| 9   6   3  | 8   1   45 | 2   45  7  |
| 4   25  7  | 6   259 3  | 8   1   59 |
+------------+------------+------------+
| 23  8   9  | 1   6   45 | 7   25  34 |
| 236 27  5  | 47  8   9  | 1   26  34 |
| 16  17  4  | 57  3   2  | 569 8   59 |
+------------+------------+------------+
| 58  9   68 | 3   45  1  | 456 7   2  |
| 25  4   1  | 25  7   6  | 3   9   8  |
| 7   3   26 | 9   245 8  | 456 456 1  |
+------------+------------+------------+

Play this puzzle online at the Daily Sudoku site

Quote:
XYZ-Wing 2,3,6 in r4c1,r5c18 and -2 in r5c2


Ciao Gianni
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TomC



Joined: 30 Oct 2020
Posts: 358
Location: Wales
PostPosted: Wed Jul 27, 2022 9:28 am    Post subject: Another way Reply with quote
XY chain abcd shows that if a=3 then d=4 OR if d=7 then a=4

So either a or d must be <4>

Pincers for <4> in a + d give -4 in r5c9 to solve (edit: and of course -4 in r4c6 as well)

Code:

+---------------+---------------+--------------+
|  128  125  28 |  245  259  7  | 459  3    6  |
|  9    6    3  |  8    1    45 | 2    45   7  |
|  4    25   7  |  6    259  3  | 8    1    59 |
+---------------+---------------+--------------+
| b23   8    9  |  1    6   -45 | 7    25  a34 |
|  236 c27   5  | d47   8    9  | 1    26  -43 |
|  16   17   4  |  57   3    2  | 569  8    59 |
+---------------+---------------+--------------+
|  58   9    68 |  3    45   1  | 456  7    2  |
|  25   4    1  |  25   7    6  | 3    9    8  |
|  7    3    26 |  9    245  8  | 456  456  1  |
+---------------+---------------+--------------+


Last edited by TomC on Fri Jul 29, 2022 7:23 am; edited 1 time in total
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TomC



Joined: 30 Oct 2020
Posts: 358
Location: Wales
PostPosted: Wed Jul 27, 2022 10:55 am    Post subject: and another ... Reply with quote
Or you could have -6 in r9c8 to avoid the <45> UR in r79c57
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