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Apr 18 VH

 
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ZeroAssoluto



Joined: 05 Feb 2017
Posts: 891
Location: Rimini, Italy

PostPosted: Thu Apr 18, 2024 9:47 am    Post subject: Apr 18 VH Reply with quote

Hi everyone,

Code:

+-----------+----------+-----------+
| 8  4 5    | 7   3  6 | 1  9  2   |
| 7  2 6    | 8   1  9 | 4  5  3   |
| 3  1 9    | 45  45 2 | 8  7  6   |
+-----------+----------+-----------+
| 9  5 24   | 1   6  3 | 7  24 8   |
| 24 7 8    | 249 49 5 | 6  3  1   |
| 6  3 1    | 24  8  7 | 9  24 5   |
+-----------+----------+-----------+
| 24 9 2347 | 6   57 1 | 35 8  47  |
| 5  6 47   | 3   79 8 | 2  1  479 |
| 1  8 37   | 59  2  4 | 35 6  79  |
+-----------+----------+-----------+

Play this puzzle online at the Daily Sudoku site

Quote:

XY-Wing 5,7,9 in r7c5,r9c49 and -7 in r7c9
or
W-Wing 4,7 in r7c9,r8c3 SL with number 7 in r9c39 and -4 in r7c13,r8c9
or
W-Wing 4,7 in r7c9,r8c3 SL with number 7 in r78c5 and -4 in r7c13,r8c9
.


Ciao Gianni
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Greenvilleguy



Joined: 01 Jul 2022
Posts: 24
Location: US

PostPosted: Mon Apr 22, 2024 12:30 pm    Post subject: Reply with quote

Did anyone solve this by anything other than trial? I see that R7C9 cannot be a 7, because of the way it relates to R7C5, R9C4 and R9C9; but it don't know why.
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glesco



Joined: 12 May 2022
Posts: 36

PostPosted: Mon Apr 22, 2024 4:30 pm    Post subject: Reply with quote

It is an XY-Wing. if you highlight ZeroAssoluto's quote, there are that and a couple of other solution
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