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Dec 22 VH

 
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ZeroAssoluto



Joined: 05 Feb 2017
Posts: 942
Location: Rimini, Italy
PostPosted: Fri Dec 22, 2023 9:33 am    Post subject: Dec 22 VH Reply with quote
Hi everyone,

Code:

+-----------+---------------+---------------+
| 4   68  2 | 39  38   5    | 1   3689 7    |
| 1   7   3 | 6   248  29   | 489 489  5    |
| 68  5   9 | 1   3478 37   | 2   3468 468  |
+-----------+---------------+---------------+
| 269 3   8 | 4   5    12   | 7   69   169  |
| 79  1   5 | 8   37   6    | 49  2    349  |
| 267 26  4 | 237 9    1237 | 68  5    1368 |
+-----------+---------------+---------------+
| 258 289 7 | 25  26   4    | 3   1    689  |
| 25  249 1 | 235 236  8    | 469 7    469  |
| 3   48  6 | 79  1    79   | 5   48   2    |
+-----------+---------------+---------------+

Play this puzzle online at the Daily Sudoku site

Quote:

XY-Wing 3,7,9 in r19c4,r3c6 and -7 in r9c6
or
XY-Wing 3,7,9 in r1c4,r39c6 and -9 in r2c6,r9c4


Ciao Gianni
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TomC



Joined: 30 Oct 2020
Posts: 358
Location: Wales
PostPosted: Fri Dec 22, 2023 1:44 pm    Post subject: Another way to solve Reply with quote
Remove <3> from r1c4 or r8c5 to solve

Code:
+-------------+-----------------+---------------+
|  4    68  2 | a39  b38   5    | 1   3689 7    |
|  1    7   3 |  6    248  29   | 489 489  5    |
| c68   5   9 |  1    3478 37   | 2   3468 468  |
+-------------+-----------------+---------------+
|  269  3   8 |  4    5    12   | 7   69   169  |
|  79   1   5 |  8    37   6    | 49  2    349  |
|  267  26  4 |  237  9    1237 | 68  5    1368 |
+-------------+-----------------+---------------+
| .258  289 7 | .25   26   4    | 3   1    689  |
| .25   249 1 | .235 a236  8    | 469 7    469  |
|  3    48  6 |  79   1    79   | 5   48   2    |
+-------------+-----------------+---------------+

Quote:
If a=3, b=8, c=8 leads to a <25> UR in r78c14
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