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Jul 30 VH

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ZeroAssoluto

Joined: 05 Feb 2017
Posts: 941
Location: Rimini, Italy

Posted: Sat Jul 30, 2022 9:09 am Post subject: Jul 30 VH

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

TomC

Joined: 30 Oct 2020
Posts: 358
Location: Wales

Posted: Sat Jul 30, 2022 7:31 pm Post subject:

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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