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ZeroAssoluto
Joined: 05 Feb 2017
Posts: 941
Location: Rimini, Italy
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 Posted: Sat Aug 29, 2020 8:28 am Post subject: Aug 29 VH |
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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 |
+------------+----------------+-----------+
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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 |
+--------+--------------+-----------+
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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: 571
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| Posted: Sat Aug 29, 2020 4:28 pm Post subject: |
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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: 941
Location: Rimini, Italy
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| Posted: Sat Aug 29, 2020 7:11 pm Post subject: |
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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: 571
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| Posted: Sun Aug 30, 2020 6:04 pm Post subject: |
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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: 571
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| Posted: Sun Aug 30, 2020 6:26 pm Post subject: |
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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: 941
Location: Rimini, Italy
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| Posted: Sun Aug 30, 2020 7:07 pm Post subject: |
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Thanks for your time
Ciao Gianni |
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