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Aug 18 VH

 
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ZeroAssoluto



Joined: 05 Feb 2017
Posts: 643
Location: Rimini, Italy

PostPosted: Wed Aug 18, 2021 8:37 am    Post subject: Aug 18 VH Reply with quote

Hi everyone,

Code:

+--------------+----------+-----------+
| 9  7    16   | 5  3  26 | 14  24 8  |
| 2  8    4    | 7  1  9  | 3   5  6  |
| 56 1356 1356 | 4  26 8  | 9   7  12 |
+--------------+----------+-----------+
| 56 2    9    | 1  56 4  | 8   3  7  |
| 7  35   8    | 9  25 23 | 146 46 14 |
| 1  4    36   | 8  7  36 | 2   9  5  |
+--------------+----------+-----------+
| 8  569  7    | 3  4  1  | 56  26 29 |
| 4  16   126  | 26 9  5  | 7   8  3  |
| 3  569  256  | 26 8  7  | 456 1  49 |
+--------------+----------+-----------+

Play this puzzle online at the Daily Sudoku site

Quote:
W-Wing 1,4 in r1c7,r5c9 SL with number 4 in r9c79 and -1 in r3c9,r5c7
or
XY-Wing 1,2,4 in r1c8,r35c9 and -4 in r5c8


Ciao Gianni
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Mogulmeister



Joined: 03 May 2007
Posts: 970

PostPosted: Wed Aug 18, 2021 3:47 pm    Post subject: Reply with quote

The "W" wing idea can be tweaked a tiny bit.

The 46 in r5c8 is connected via a Strong Link on 2's r7c89 to 49 in r9c9.

Either the 4 in r5c8 is true or the 4 in r9c9 is true. Either way r5c9 <> 4.

Yes, it's an XY chain.
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