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Jul 22 VH

 
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ZeroAssoluto



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

PostPosted: Fri Jul 22, 2022 9:40 am    Post subject: Jul 22 VH Reply with quote

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
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TomC



Joined: 30 Oct 2020
Posts: 349
Location: Wales

PostPosted: Sat Jul 23, 2022 9:36 am    Post subject: Reply with quote

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>
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TomC



Joined: 30 Oct 2020
Posts: 349
Location: Wales

PostPosted: Mon Jul 25, 2022 9:31 am    Post subject: Reply with quote

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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