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Sep 25 VH

 
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ZeroAssoluto



Joined: 05 Feb 2017
Posts: 868
Location: Rimini, Italy

PostPosted: Sun Sep 25, 2022 9:23 am    Post subject: Sep 25 VH Reply with quote

Hi everyone,

Code:

+------------+----------+-----------+
| 349 2  7   | 6  49 1  | 389 5 89  |
| 5   16 19  | 8  2  3  | 69  7 4   |
| 349 68 389 | 49 7  5  | 369 1 2   |
+------------+----------+-----------+
| 7   4  89  | 1  6  89 | 5   2 3   |
| 19  3  6   | 2  5  89 | 7   4 18  |
| 2   18 5   | 7  3  4  | 89  6 189 |
+------------+----------+-----------+
| 8   9  2   | 5  1  7  | 4   3 6   |
| 6   7  4   | 3  8  2  | 1   9 5   |
| 13  5  13  | 49 49 6  | 2   8 7   |
+------------+----------+-----------+

Play this puzzle online at the Daily Sudoku site

Quote:
XY-Wing 1,8,9 in r24c3,r6c2 and -1 in r2c2
or W-Wing
1,9 in r2c3,r5c1 SL with number 1 in r9c13 and -9 in r13c1,r4c3
1,9 in r2c3,r5c1 SL with number 1 in r26c2 and -9 in r13c1,r4c3
8,9 in r4c3,r6c7 SL with number 9 in r2c37 and -8 in r6c2


Ciao Gianni
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TomC



Joined: 30 Oct 2020
Posts: 349
Location: Wales

PostPosted: Sun Sep 25, 2022 10:06 am    Post subject: Reply with quote

There is a <89> Unique Rectangle in r16c79 to avoid

Remove <3> from r1c1 to solve

Code:

+---------------+----------+-------------+
| b349  2   7   | 6  49 1  |  389 5  89  |
|  5    16  19  | 8  2  3  |  69  7  4   |
|  349  68  389 | 49 7  5  |  369 1  2   |
+---------------+----------+-------------+
|  7    4   89  | 1  6  89 |  5   2  3   |
| d19   3   6   | 2  5  89 |  7   4 e18  |
|  2    18  5   | 7  3  4  |  89  6  189 |
+---------------+----------+-------------+
|  8    9   2   | 5  1  7  |  4   3  6   |
|  6    7   4   | 3  8  2  |  1   9  5   |
| c13   5   13  | 49 49 6  |  2   8  7   |
+---------------+----------+-------------+

If b=3 then r1c79 = <89>
If b=3, c=1, d<>1, e=1 then r6c79=<89>
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