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May 10 VH

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ZeroAssoluto

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

Posted: Tue May 10, 2022 8:21 am Post subject: May 10 VH

Hi everyone,

Code:

+-------------+--------------+-------------+
| 27 9 4 | 5 1 3 | 27 6 8 |
| 3 5 6 | 8 7 2 | 9 1 4 |
| 8 27 1 | 9 6 4 | 5 37 237 |
+-------------+--------------+-------------+
| 1 467 29 | 47 24589 579 | 3 458 2679 |
| 579 347 239 | 6 24589 1 | 27 458 279 |
| 579 467 8 | 3 2459 579 | 1 45 2679 |
+-------------+--------------+-------------+
| 29 23 5 | 47 49 6 | 8 37 1 |
| 6 1 7 | 2 3 8 | 4 9 5 |
| 4 8 39 | 1 59 579 | 6 2 37 |
+-------------+--------------+-------------+

Play this puzzle online at the Daily Sudoku site

Quote:

XY-Wing
2,3,7 in r37c2,r7c8 and -7 in r3c8
2,3,7 in r3c28,r7c2 and -3 in r7c8

Ciao Gianni

TomC

Joined: 30 Oct 2020
Posts: 358
Location: Wales

Posted: Tue May 10, 2022 2:03 pm Post subject:

Code:

+---------------+--------------+--------------+
| 27 9 4 | 5 1 3 | 27 6 8 |
| 3 5 6 | 8 7 2 | 9 1 4 |
| 8 b27 1 | 9 6 4 | 5 37 a237 |
+---------------+--------------+--------------+
| 1 467 29 | 47 24589 579 | 3 458 2679 |
| 579 347 239 | 6 24589 1 | 27 458 279 |
| 579 467 8 | 3 2459 579 | 1 45 2679 |
+---------------+--------------+--------------+
| 29 c23 5 | 47 49 6 | 8 37 1 |
| 6 1 7 | 2 3 8 | 4 9 5 |
| 4 8 -39 | 1 59 579 | 6 2 -37 |
+---------------+--------------+--------------+

If a=3, b=2, c=3 leads to no <3> in row 9 so this reveals a <27> pair in box 3 to solve

There is also a 39-2 XY wing pivot r9c3 which doesn't do anything

Mogulmeister

Joined: 03 May 2007
Posts: 1151

Posted: Thu May 12, 2022 6:59 am Post subject:

Pincers for 2 at r7c1 and r3c2 are the two ends of an xy chain that removes 2 from r1c1 and r7c2.

glesco

Joined: 12 May 2022
Posts: 36

Posted: Tue Jun 07, 2022 10:44 pm Post subject:

237 xy-wing eliminates a 3 at r7c8. s/b stte from there

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