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Jul 24 VH

 
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ZeroAssoluto



Joined: 05 Feb 2017
Posts: 940
Location: Rimini, Italy
PostPosted: Sat Jul 24, 2021 7:51 am    Post subject: Jul 24 VH Reply with quote
Hi everyone,

Code:

+-----------+------------+------------+
| 48 49  6  | 789 2  78  | 5  1   3   |
| 2  3   89 | 1   59 58  | 4  6   7   |
| 1  5   7  | 6   4  3   | 28 89  29  |
+-----------+------------+------------+
| 3  6   58 | 2   7  9   | 1  4   58  |
| 58 7   4  | 3   6  1   | 9  2   58  |
| 9  1   2  | 5   8  4   | 7  3   6   |
+-----------+------------+------------+
| 6  249 59 | 489 1  258 | 3  7   249 |
| 7  249 3  | 49  59 6   | 28 589 1   |
| 45 8   1  | 479 3  257 | 6  59  249 |
+-----------+------------+------------+

Play this puzzle online at the Daily Sudoku site

Quote:
XY-Wing 5,8,9 in r2c36,r7c3 and -5 in r7c6
or
W-Wing 5,8 in r2c6,r4c3 SL with number 5 in r7c36 and -8 in r2c3
or
W-Wing 5,9 in r7c3,r8c5 SL with number 9 in r2c35 and -5 in r7c6


Ciao Gianni
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TomC



Joined: 30 Oct 2020
Posts: 358
Location: Wales
PostPosted: Sat Jul 24, 2021 5:51 pm    Post subject: Reply with quote
If you look at the above grid in box 1,2 and 7 you see three cells 48-58-45 which looks like an XY but is not!

But, if r1c1=4, r9c1=5, r7c6=5, r2c6=8 leads to no 8's in row 1
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Mogulmeister



Joined: 03 May 2007
Posts: 1151
PostPosted: Mon Jul 26, 2021 12:23 pm    Post subject: Reply with quote
Yes - a contradiction. When you plug the 4 into r1c1 the loop tells you it doesn't belong there.

4r1c1-(4=5)r9c1-r7c3=r7c6-(5=8)r2c6-(8=9)r2c3-(9=4)r2c2-(4)r1c1
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