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Aug 29 VH

 
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ZeroAssoluto



Joined: 05 Feb 2017
Posts: 525
Location: Rimini, Italy

PostPosted: Sat Aug 29, 2020 8:28 am    Post subject: Aug 29 VH Reply with quote

Hi everyone,

first step

Code:

+------------+----------------+-----------+
| 1   4   9  | 35    8   7    | 6  35  2  |
| 8   35  2  | 345   9   6    | 34 7   1  |
| 57  356 67 | 12345 24  1234 | 9  8   45 |
+------------+----------------+-----------+
| 245 7   3  | 24    1   9    | 8  25  6  |
| 245 56  68 | 7     3   248  | 25 1   9  |
| 9   28  1  | 6     5   28   | 7  4   3  |
+------------+----------------+-----------+
| 27  9   5  | 1234  247 1234 | 34 6   8  |
| 6   28  78 | 9     247 2345 | 1  235 45 |
| 3   1   4  | 8     6   25   | 25 9   7  |
+------------+----------------+-----------+

Play this puzzle online at the Daily Sudoku site

XY-Wing 3,4,5 in r2c27,r3c9 and -5 in r3c12

second step

Code:

+--------+--------------+-----------+
| 1  4 9 | 35   8  7    | 6  35  2  |
| 8  5 2 | 34   9  6    | 34 7   1  |
| 7  3 6 | 1245 24 124  | 9  8   45 |
+--------+--------------+-----------+
| 45 7 3 | 24   1  9    | 8  25  6  |
| 45 6 8 | 7    3  24   | 25 1   9  |
| 9  2 1 | 6    5  8    | 7  4   3  |
+--------+--------------+-----------+
| 2  9 5 | 14   7  134  | 34 6   8  |
| 6  8 7 | 9    24 2345 | 1  235 45 |
| 3  1 4 | 8    6  25   | 25 9   7  |
+--------+--------------+-----------+

Play this puzzle online at the Daily Sudoku site

XY-Wing 2,4,5 in r8c59,r9c7 and -2 in r8c8,r9c6

Ciao Gianni
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immpy



Joined: 06 May 2017
Posts: 319

PostPosted: Sat Aug 29, 2020 4:28 pm    Post subject: Reply with quote

From Gianni's first grid; WXYZ-Wing: 2568 r5c237, r6c2 and r5c1<>2,5(=4!).

cheers...immp


Last edited by immpy on Sun Aug 30, 2020 6:31 pm; edited 1 time in total
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ZeroAssoluto



Joined: 05 Feb 2017
Posts: 525
Location: Rimini, Italy

PostPosted: Sat Aug 29, 2020 7:11 pm    Post subject: Reply with quote

Hi immpy,

I'm not sure if the number 5 can be eliminated, as I know this technique.
The cells wings, for me, are r5c7 and r6c2 which have the number 2 in common and this can be deleted from r5c1.
Do i have to study again?

Ciao Gianni


Last edited by ZeroAssoluto on Sun Aug 30, 2020 7:04 pm; edited 1 time in total
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immpy



Joined: 06 May 2017
Posts: 319

PostPosted: Sun Aug 30, 2020 6:04 pm    Post subject: Reply with quote

Hello Gianni,

As I understand it, in any cell(s) that can "see" all 4 of the cells that make up the WXYZ-wing, eliminations can be made. It is not limited to the outer wing cells only. In fact, one could not use ONLY the outer wing cells to make eliminations (in this case it would be r6c789<>2 if any existed). They don't see all 4 cells of the WXYZ-Wing. But maybe I need to study again.

cheers...immp
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immpy



Joined: 06 May 2017
Posts: 319

PostPosted: Sun Aug 30, 2020 6:26 pm    Post subject: Reply with quote

Hello again,

I did do some studying...there are several different types of these WXYZ-Wings, where extra eliminations may be made depending on where the various candidates are located. It seems in this case that any 2 (if it were to exist) could indeed be eliminated from r6c789, based on the position of 2 in the cells of the WXYZ-Wing. But surely also, the 2 and the 5 are correctly eliminated from r5c1 as this cell sees all four of the wing cells.

It is always good to re-learn a technique and its nuances from time to time, especially if we aren't exposed to it often. Thanks for the push Gianni. I love these WXYZ-Wings of late, they are helping to crush some tough puzzles, and I am searching earnestly for them now.

cheers...immp
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ZeroAssoluto



Joined: 05 Feb 2017
Posts: 525
Location: Rimini, Italy

PostPosted: Sun Aug 30, 2020 7:07 pm    Post subject: Reply with quote

Thanks for your time

Ciao Gianni
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