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Jul 25 VH

 
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ZeroAssoluto



Joined: 05 Feb 2017
Posts: 941
Location: Rimini, Italy
PostPosted: Mon Jul 25, 2022 8:16 am    Post subject: Jul 25 VH Reply with quote
Hi everyone,

Code:

+----------+-----------+--------+
| 1 7  5   | 6  9   4  | 3 2  8 |
| 4 38 238 | 78 27  5  | 9 1  6 |
| 9 6  28  | 1  3   28 | 4 5  7 |
+----------+-----------+--------+
| 2 38 4   | 38 6   1  | 5 7  9 |
| 6 1  7   | 34 5   9  | 8 34 2 |
| 5 9  38  | 2  47  78 | 6 34 1 |
+----------+-----------+--------+
| 3 2  1   | 5  8   6  | 7 9  4 |
| 8 5  9   | 47 247 27 | 1 6  3 |
| 7 4  6   | 9  1   3  | 2 8  5 |
+----------+-----------+--------+

Play this puzzle online at the Daily Sudoku site

Quote:
XY-Wing
2,7,8 in r2c5,r36c6 and -7 in r6c5
2,7,8 in r2c4,r38c6 and -7 in r8c4
W-Wing
2,7 in r2c5,r8c6 SL with number 7 in r6c56 and -2 in r3c6,r8c5
2,7 in r2c5,r8c6 SL with number 7 in r28c4 and -2 in r3c6,r8c5
4,7 in r6c5,r8c4 SL with number 7 in r68c6 and -4 in r5c4,r8c5
4,7 in r6c5,r8c4 SL with number 7 in r2c45 and -4 in r5c4,r8c5


Ciao Gianni
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TomC



Joined: 30 Oct 2020
Posts: 358
Location: Wales
PostPosted: Mon Jul 25, 2022 9:39 am    Post subject: Reply with quote
XY chain abcde give pincers on <2> in a + e to give -2 in r2c3 and r3c6 to solve
Code:

+-----------+-------------+---------+
| 1 7   5   | 6   9    4  | 3  2  8 |
| 4 38 -238 | 78 e27   5  | 9  1  6 |
| 9 6  a28  | 1   3   -28 | 4  5  7 |
+-----------+-------------+---------+
| 2 38  4   | 38  6    1  | 5  7  9 |
| 6 1   7   | 34  5    9  | 8  34 2 |
| 5 9  b38  | 2  d47   78 | 6 c34 1 |
+-----------+-------------+---------+
| 3 2   1   | 5   8    6  | 7  9  4 |
| 8 5   9   | 47  247  27 | 1  6  3 |
| 7 4   6   | 9   1    3  | 2  8  5 |
+-----------+-------------+---------+
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glesco



Joined: 12 May 2022
Posts: 36
PostPosted: Tue Jul 26, 2022 2:38 am    Post subject: Reply with quote
I used an x-wing on c24 which removes 8 from r2c3.
Then it is a BUG that puts a 7 in r8c5
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