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VH 081221

 
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immpy



Joined: 06 May 2017
Posts: 571
PostPosted: Thu Aug 12, 2021 4:58 pm    Post subject: VH 081221 Reply with quote
Hello all, enjoy the puzzle...

Code:

+-------+-------+-------+
| 8 . 2 | 1 . 7 | 3 . 6 |
| . . . | . . . | . . . |
| . . 5 | . 3 . | 1 . . |
+-------+-------+-------+
| . . 8 | 5 . 4 | 7 . . |
| 4 5 1 | 9 . 8 | 6 3 2 |
| 9 . 7 | 3 . 6 | 4 . . |
+-------+-------+-------+
| . . 3 | . 6 . | 9 . . |
| . . . | . . . | . . . |
| 2 . 6 | 4 . 1 | 8 . 3 |
+-------+-------+-------+

Play this puzzle online at the Daily Sudoku site

cheers...immp
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ZeroAssoluto



Joined: 05 Feb 2017
Posts: 942
Location: Rimini, Italy
PostPosted: Thu Aug 12, 2021 6:35 pm    Post subject: Reply with quote
Hi everyone,

Code:

+--------------+-------------+---------------+
| 8   49    2  | 1   45  7   | 3  59    6    |
| 13  13    49 | 6   458 259 | 25 25789 5789 |
| 67  67    5  | 28  3   29  | 1  2489  489  |
+--------------+-------------+---------------+
| 36  36    8  | 5   2   4   | 7  19    19   |
| 4   5     1  | 9   7   8   | 6  3     2    |
| 9   2     7  | 3   1   6   | 4  58    58   |
+--------------+-------------+---------------+
| 157 1478  3  | 278 6   25  | 9  12457 1457 |
| 157 14789 49 | 278 589 3   | 25 6     1457 |
| 2   79    6  | 4   59  1   | 8  57    3    |
+--------------+-------------+---------------+

Play this puzzle online at the Daily Sudoku site

XY-Wing 4,5,9 r1c25,r9c5 and -9 in r9c2

Ciao Gianni
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TomC



Joined: 30 Oct 2020
Posts: 358
Location: Wales
PostPosted: Thu Aug 12, 2021 7:39 pm    Post subject: Reply with quote
The 25 W wing in rows 7 and 8 give r8c4, r7c8 <>2
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Mogulmeister



Joined: 03 May 2007
Posts: 1151
PostPosted: Fri Aug 13, 2021 10:16 am    Post subject: Reply with quote
Code:
+--------------+-------------+---------------+
| 8   49b   2  | 1   45a 7   | 3  *59*  6    |
| 13  13    49 | 6   458 259 | 25 25789 5789 |
| 67  67    5  | 28  3   29  | 1  2489  489  |
+--------------+-------------+---------------+
| 36  36    8  | 5   2   4   | 7  19    19   |
| 4   5     1  | 9   7   8   | 6  3     2    |
| 9   2     7  | 3   1   6   | 4  58    58   |
+--------------+-------------+---------------+
| 157 1478  3  | 278 6   25  | 9  12457 1457 |
| 157 14789 49 | 278 589 3   | 25 6     1457 |
| 2   79c   6  | 4  *59* 1   | 8  57d   3    |
+--------------+-------------+---------------+


There's a simple XY chain follow a to d. Pincers for 5 at a and d.

Gets rid of 5 at r1c8 and r9c5 shown by *
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Mogulmeister



Joined: 03 May 2007
Posts: 1151
PostPosted: Fri Aug 13, 2021 11:51 am    Post subject: Reply with quote
…and the Eureka

(5=4)r1c5-(4=9)r1c2-(9=7)r9c2-(7=5)r9c8 ==> r1c8, r9c5 <> 5

Essentially if you turn off the 5 at one pincer end the pincer at the other end will turn 5 on.
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