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Nov 24 VH

 
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ZeroAssoluto



Joined: 05 Feb 2017
Posts: 942
Location: Rimini, Italy
PostPosted: Fri Nov 24, 2023 9:50 am    Post subject: Nov 24 VH Reply with quote
Hi everyone,

Code:

+--------+----------+------------+
| 2 1 6  | 3  79  4 | 578 59 78  |
| 9 5 7  | 68 68  1 | 2   3  4   |
| 3 4 8  | 5  79  2 | 17  19 6   |
+--------+----------+------------+
| 6 8 3  | 1  2   7 | 9   4  5   |
| 5 7 4  | 68 368 9 | 18  12 238 |
| 1 2 9  | 4  38  5 | 6   7  38  |
+--------+----------+------------+
| 4 6 12 | 9  15  3 | 57  8  27  |
| 7 9 5  | 2  4   8 | 3   6  1   |
| 8 3 12 | 7  15  6 | 4   25 9   |
+--------+----------+------------+

Play this puzzle online at the Daily Sudoku site

Quote:

XY-Wing 1,7,8 in r1c9,r35c7 and -8 in r1c7,r56c9
or
XYZ-Wing 5,7,8 in r1c79,r7c7 and -7 in r3c7


Ciao Gianni
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TomC



Joined: 30 Oct 2020
Posts: 358
Location: Wales
PostPosted: Sat Nov 25, 2023 9:35 am    Post subject: Reply with quote
Remove <5> from r1c7, r9c8 to solve
Code:

+--------+----------+---------------+
| 2 1 6  | 3  79  4 | x578 d59  78  |
| 9 5 7  | 68 68  1 |  2    3   4   |
| 3 4 8  | 5  79  2 | b17  c19  6   |
+--------+----------+---------------+
| 6 8 3  | 1  2   7 |  9    4   5   |
| 5 7 4  | 68 368 9 |  18   12  238 |
| 1 2 9  | 4  38  5 |  6    7   38  |
+--------+----------+---------------+
| 4 6 12 | 9  15  3 | a57   8   27  |
| 7 9 5  | 2  4   8 |  3    6   1   |
| 8 3 12 | 7  15  6 |  4   x25  9   |
+--------+----------+---------------+

Quote:
XY chain abcd (57-17-19-59) gives pincers of <5> in a + d to remove <5> from x
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Greenvilleguy



Joined: 01 Jul 2022
Posts: 24
Location: US
PostPosted: Sat Nov 25, 2023 2:10 pm    Post subject: Reply with quote
Also, Y wing in R1C9, R3C7, R5C7 removes <8> from R1C7.

Interestingly, a 3 must be in R5C5 or you would have a rectangle of "68'S", which is not allowed in a solvable puzzle.
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