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May 08 VH

 
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ZeroAssoluto



Joined: 05 Feb 2017
Posts: 942
Location: Rimini, Italy
PostPosted: Sun May 08, 2022 9:54 am    Post subject: May 08 VH Reply with quote
Hi everyone,

Code:

+--------+----------+-----------+
| 7 5 24 | 89 46 12 | 3  169 68 |
| 1 3 24 | 89 46 5  | 28 69  7  |
| 9 8 6  | 3  7  12 | 24 14  5  |
+--------+----------+-----------+
| 8 1 9  | 4  3  7  | 6  5   2  |
| 6 2 3  | 1  5  9  | 48 7   48 |
| 5 4 7  | 6  2  8  | 9  3   1  |
+--------+----------+-----------+
| 4 6 8  | 5  1  3  | 7  2   9  |
| 3 7 5  | 2  9  46 | 1  8   46 |
| 2 9 1  | 7  8  46 | 5  46  3  |
+--------+----------+-----------+

Play this puzzle online at the Daily Sudoku site

Quote:
XY-Wing
6,8,9 in r1c49,r2c8 and -9 in r1c8,r2c4
6,8,9 in r1c9,r2c48 and -8 in r1c4,r2c7
or
BUG+1 in r1c8 = 6


Ciao Gianni
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TomC



Joined: 30 Oct 2020
Posts: 358
Location: Wales
PostPosted: Sun May 08, 2022 10:31 am    Post subject: Reply with quote
Code:

+---------+-------------+-------------+
| 7 5 c24 | 89 d46  b12 | 3  a169 e68 |
| 1 3  24 | 89  46   5  | 28 x69   7  |
| 9 8  6  | 3   7    12 | 24  14   5  |
+---------+-------------+-------------+
| 8 1  9  | 4   3    7  | 6   5    2  |
| 6 2  3  | 1   5    9  | 48  7    48 |
| 5 4  7  | 6   2    8  | 9   3    1  |
+---------+-------------+-------------+
| 4 6  8  | 5   1    3  | 7    2   9  |
| 3 7  5  | 2   9    46 | 1    8   46 |
| 2 9  1  | 7   8    46 | 5    46  3  |
+---------+-------------+-------------+

If a =1 then e=8
If a<>1 then ax=<69> and e=8
So it doesn't matter if ax is <69> pair or not, e=8 to solve


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TomC



Joined: 30 Oct 2020
Posts: 358
Location: Wales
PostPosted: Sun May 08, 2022 2:45 pm    Post subject: Reply with quote
Or you could have if b=2, c=4, d=6, e=8, r2c7=2, r2c3=4, c=2

So b=1 to solve


Or this is an XY chain 24-46-68-28 with pincers on <2> in c and r2c7 giving -2 in r2c3
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Mogulmeister



Joined: 03 May 2007
Posts: 1151
PostPosted: Mon May 09, 2022 7:36 am    Post subject: Reply with quote
Very nice Tom. Your first describes an ANP from a and x.
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