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Jul 30 VH

 
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ZeroAssoluto



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

PostPosted: Sat Jul 30, 2022 9:09 am    Post subject: Jul 30 VH Reply with quote

Hi everyone,

Code:

+-----------+------------+--------------+
| 168 2  36 | 18 5   9   | 4  7    138  |
| 18  9  5  | 4  3   7   | 2  18   6    |
| 148 34 7  | 2  68  168 | 5  189  1389 |
+-----------+------------+--------------+
| 46  7  46 | 5  1   3   | 8  29   29   |
| 2   13 9  | 78 678 68  | 13 5    4    |
| 5   8  13 | 9  2   4   | 13 6    7    |
+-----------+------------+--------------+
| 3   6  8  | 17 47  2   | 9  14   5    |
| 9   14 2  | 6  48  5   | 7  3    18   |
| 7   5  14 | 3  9   18  | 6  1248 128  |
+-----------+------------+--------------+

Play this puzzle online at the Daily Sudoku site

Quote:
XY-Wing
1,4,8 in r7c8,r8c59 and -4 in r7c5
1,4,8 in r8c5,r9c36 and -4 in r8c2
1,4,8 in r8c25,r9c6 and -1 in r9c3
W-Wing
1,8 in r8c9,r9c6 SL with number 1 in r7c48 and -8 in r8c5,r9c89
1,4 in r7c8,r8c2 SL with number 4 in r9c38 and -1 in r8c9
1,4 in r7c8,r9c3 SL with number 1 in r8c29 and -4 in r9c8


Ciao Gianni
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TomC



Joined: 30 Oct 2020
Posts: 349
Location: Wales

PostPosted: Sat Jul 30, 2022 7:31 pm    Post subject: Reply with quote

XY chain abcd gives pincers of <1> in a+d to remove <1> from r7c8 to solve
Code:

+-----------+----------------+----------------+
| 168 2  36 | e18   5    9   | 4   7     138  |
| 18  9  5  |  4    3    7   | 2   18    6    |
| 148 34 7  |  2   -86   168 | 5   189   1389 |
+-----------+----------------+----------------+
| 46  7  46 |  5    1    3   | 8   29    29   |
| 2   13 9  |  78   678  68  | 13  5     4    |
| 5   8  13 |  9    2    4   | 13  6     7    |
+-----------+----------------+----------------+
| 3   6  8  | a17  b47   2   | 9  -14    5    |
| 9   14 2  |  6   c48   5   | 7   3    d18   |
| 7   5  14 |  3    9    18  | 6   1248  128  |
+-----------+----------------+----------------+

Also note that there is another XY chain eabc with pincers of <8> in e+c which removes <8> from r3c5 but you would need another step to solve
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