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Jul 22 VH

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ZeroAssoluto

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

Posted: Fri Jul 22, 2022 9:40 am Post subject: Jul 22 VH

Hi everyone,

Code:

+---------+------------+------------+
| 6 78 3 | 9 28 1 | 24 5 47 |
| 9 5 78 | 23 4 238 | 26 67 1 |
| 1 4 2 | 6 5 7 | 8 3 9 |
+---------+------------+------------+
| 8 79 79 | 24 23 6 | 5 1 34 |
| 2 1 5 | 47 389 89 | 46 678 347 |
| 4 3 6 | 57 1 58 | 9 78 2 |
+---------+------------+------------+
| 3 6 1 | 8 29 29 | 7 4 5 |
| 7 2 4 | 35 6 35 | 1 9 8 |
| 5 89 89 | 1 7 4 | 3 2 6 |
+---------+------------+------------+

Play this puzzle online at the Daily Sudoku site

Quote:

XYZ-Wing 3,4,7 in r4c9,r5c49 and -4 in r5c7
or
W-Wing 4,7 in r1c9,r5c4 SL with number 4 in r4c49 and -7 in r5c9

Ciao Gianni

TomC

Joined: 30 Oct 2020
Posts: 358
Location: Wales

Posted: Sat Jul 23, 2022 9:36 am Post subject:

r6c6 = 5 to solve

Code:

+---------+---------------+--------------+
| 6 78 3 | 9 28 1 | 24 5 47 |
| 9 5 78 | b23 4 b238 | c26 d67 1 |
| 1 4 2 | 6 5 7 | 8 3 9 |
+---------+---------------+--------------+
| 8 79 79 | 24 23 6 | 5 1 34 |
| 2 1 5 | 47 389 89 | 46 678 347 |
| 4 3 6 | 57 1 a58 | 9 e78 2 |
+---------+---------------+--------------+
| 3 6 1 | 8 29 29 | 7 4 5 |
| 7 2 4 | 35 6 35 | 1 9 8 |
| 5 89 89 | 1 7 4 | 3 2 6 |
+---------+---------------+--------------+

If a=8, b=<23>, c=6, d=7, e=8 so a cannot be <8>

It doesn't matter if b=<23> pair or not, a cannot be <8>
It doesn't matter if r1c5 is <2> or <8>, a cannot be <8>

TomC

Joined: 30 Oct 2020
Posts: 358
Location: Wales

Posted: Mon Jul 25, 2022 9:31 am Post subject:

XY chain abcde give pincers on <7> in a + e to give -7 in r6c8

Code:

+---------+---------------+--------------+
| 6 78 3 | 9 28 1 | 24 5 47 |
| 9 5 78 | c23 4 238 | d26 e67 1 |
| 1 4 2 | 6 5 7 | 8 3 9 |
+---------+---------------+--------------+
| 8 79 79 | 24 23 6 | 5 1 34 |
| 2 1 5 | 47 389 89 | 46 678 347 |
| 4 3 6 | a57 1 a58 | 9 -78 2 |
+---------+---------------+--------------+
| 3 6 1 | 8 29 29 | 7 4 5 |
| 7 2 4 | b35 6 35 | 1 9 8 |
| 5 89 89 | 1 7 4 | 3 2 6 |
+---------+---------------+--------------+

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