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Jan 29 VH

 
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ZeroAssoluto



Joined: 05 Feb 2017
Posts: 942
Location: Rimini, Italy
PostPosted: Sat Jan 29, 2022 10:46 am    Post subject: Jan 29 VH Reply with quote
Hi everyone,

Code:

+------------+-----------------+-----------+
| 47 9  2    | 14568 4578 1567 | 46  3  45 |
| 47 8  6    | 45    3    2    | 1   57 9  |
| 1  5  3    | 46    9    67   | 246 27 8  |
+------------+-----------------+-----------+
| 3  6  1789 | 2     578  1579 | 89  4  15 |
| 25 17 1789 | 14689 478  1679 | 389 25 13 |
| 25 4  189  | 1589  58   3    | 289 6  7  |
+------------+-----------------+-----------+
| 9  17 17   | 3     6    4    | 5   8  2  |
| 6  2  5    | 7     1    8    | 34  9  34 |
| 8  3  4    | 59    2    59   | 7   1  6  |
+------------+-----------------+-----------+

Play this puzzle online at the Daily Sudoku site

Quote:
XY-Wing 4,5,7 in r1c9,r2c18 and -4 in r1c1
or
XY-Wing 4,5,7 in r1c19,r2c8 and -7 in r2c1
or
W-Wing 4,5 in r1c9,r2c4 SL with number 4 in r3c47 and -5 in r1c456,r2c8


Ciao Gianni
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TomC



Joined: 30 Oct 2020
Posts: 358
Location: Wales
PostPosted: Sat Jan 29, 2022 10:58 am    Post subject: Reply with quote
Pincers on <7> in r3c6 and r2c8 remove 7 from r3c8
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Mogulmeister



Joined: 03 May 2007
Posts: 1151
PostPosted: Mon Jan 31, 2022 8:11 am    Post subject: Reply with quote
Same pincers at r2c4 and r1c9 for 5 as you Gianni in your W-wing. However instead of the SL in row 3, I took the <47> pair in r12c1 to make the same eliminations. Unpacking that one looks more like an xy chain.
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Mogulmeister



Joined: 03 May 2007
Posts: 1151
PostPosted: Mon Jan 31, 2022 8:34 am    Post subject: Reply with quote
...and to show the parallel universe of contradiction, when you plug 4 into r1c1 you get 5 in r1c9 and then 7 in r2c8 which puts yet another 4 in column 1 at r2c1.

Not allowed, so r1c1 < > 4.

This is of course the black mirror to the -7 in r2c1 removed by the <457> XY wing already mentioned.
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