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May 01 VH

 
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TomC



Joined: 30 Oct 2020
Posts: 349
Location: Wales

PostPosted: Sun May 01, 2022 6:26 am    Post subject: May 01 VH Reply with quote

Code:

+---------+---------------+--------+
| 7 4  5  | 3    6     2  | 1 8 9  |
| 9 3  8  | 1    47    47 | 5 6 2  |
| 2 6  1  | 89   89    5  | 4 3 7  |
+---------+---------------+--------+
| 6 2  3  | 48   5     48 | 7 9 1  |
| 1 5  4  | 6    79    79 | 3 2 8  |
| 8 9  7  | 2    1     3  | 6 4 5  |
+---------+---------------+--------+
| 4 1 a69 | 7   x389  x89 | 2 5 36 |
| 3 8 b26 | 5   c24    1  | 9 7 46 |
| 5 7 x29 | d49  2349  6  | 8 1 34 |
+---------+---------------+--------+

Play this puzzle online at the Daily Sudoku site

Quote:
XY chain a-d or d-a gives pincers on <9> in a and d leads to -9 in x to solve

Standard solutions involving <489> work as well
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TomC



Joined: 30 Oct 2020
Posts: 349
Location: Wales

PostPosted: Sun May 01, 2022 7:25 am    Post subject: Reply with quote

Also deadly pattern in r257c56 of <47> <79> <89> is avoided by -3 in r9c5 so r9c9 = 3 to solve

(this works but not sure of the logic now!)
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ZeroAssoluto



Joined: 05 Feb 2017
Posts: 868
Location: Rimini, Italy

PostPosted: Sun May 01, 2022 8:36 am    Post subject: Reply with quote

Hi everyone,

Quote:
XY-Wing
4,8,9 in r49c4,r7c6 and -8 in r4c6
2,4,9 in r8c5,r9c34 and -2 in r8c3,r9c5
4,8,9 in r47c6,r9c4 and -4 in r4c4
or
W-Wing
8,9 in r3c5,r7c6 SL with number 9 in r39c4 and -8 in r7c5
8,9 in r3c5,r7c6 SL with number 9 in r5c56 and -8 in r7c5
8,9 in r3c4,r7c6 SL with number 8 in r37c5 and -9 in r9c4
8,9 in r3c4,r7c6 SL with number 8 in r4c46 and -9 in r9c4


Ciao Gianni
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Mogulmeister



Joined: 03 May 2007
Posts: 1151

PostPosted: Wed May 04, 2022 10:00 am    Post subject: Reply with quote

TomC wrote:
Also deadly pattern in r257c56 of <47> <79> <89> is avoided by -3 in r9c5 so r9c9 = 3 to solve

(this works but not sure of the logic now!)


The UR means that r7c5 must be 3 which solves the puzzle, Tom ?
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TomC



Joined: 30 Oct 2020
Posts: 349
Location: Wales

PostPosted: Wed May 04, 2022 2:00 pm    Post subject: Reply with quote

Thanks, I was not sure about the UR but I did know that r9c5 <> 3

If r9c5=3, <89> pair in r7c56 gives a=6 and d=4 when either a or d must be <9>
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Mogulmeister



Joined: 03 May 2007
Posts: 1151

PostPosted: Wed May 04, 2022 3:12 pm    Post subject: Reply with quote

..nice way of looking at it.
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