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Mar 15 VH

 
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ZeroAssoluto



Joined: 05 Feb 2017
Posts: 940
Location: Rimini, Italy

PostPosted: Fri Mar 15, 2024 10:06 am    Post subject: Mar 15 VH Reply with quote

Hi everyone,

Code:

+--------+-----------+-----------+
| 3 8  6 | 2   19 4  | 5 179 179 |
| 2 15 7 | 89  6  58 | 3 4   19  |
| 4 15 9 | 37  17 35 | 8 2   6   |
+--------+-----------+-----------+
| 6 7  5 | 1   3  9  | 2 8   4   |
| 1 3  8 | 6   4  2  | 9 57  57  |
| 9 4  2 | 5   8  7  | 1 6   3   |
+--------+-----------+-----------+
| 5 9  4 | 378 27 38 | 6 13  12  |
| 7 2  1 | 39  5  6  | 4 39  8   |
| 8 6  3 | 4   29 1  | 7 59  259 |
+--------+-----------+-----------+

Play this puzzle online at the Daily Sudoku site

Quote:

XY-Wing 3,8,9 in r28c4,r7c6 and -8 in r2c6,r7c4
or
XYZ-Wing 3,7,8 in r37c4,r7c6 and -3 in r8c4
.


Ciao Gianni
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TomC



Joined: 30 Oct 2020
Posts: 358
Location: Wales

PostPosted: Fri Mar 15, 2024 1:23 pm    Post subject: Reply with quote

I thought I saw a <129> XY wing in abc, not so, but still helped me remove <2> from r7c5 or r9c9 to solve
Code:

+--------+------------+------------+
| 3 8  6 | 2    19 4  | 5 179  179 |
| 2 15 7 | 89   6  58 | 3 4   c19  |
| 4 15 9 | 37   17 35 | 8 2    6   |
+--------+------------+------------+
| 6 7  5 | 1    3  9  | 2 8    4   |
| 1 3  8 | 6    4  2  | 9 57   57  |
| 9 4  2 | 5    8  7  | 1 6    3   |
+--------+------------+------------+
| 5 9  4 | 378 x27 38 | 6 13  b12  |
| 7 2  1 | 39   5  6  | 4 39   8   |
| 8 6  3 | 4   a29 1  | 7 59  x259 |
+--------+------------+------------+

Quote:
If x=2, a=9
If x=2, b=1, c=9
Leads to no <9>'s in row 1
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