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Oct 09 VH

 
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ZeroAssoluto



Joined: 05 Feb 2017
Posts: 942
Location: Rimini, Italy
PostPosted: Sun Oct 09, 2022 9:13 am    Post subject: Oct 09 VH Reply with quote
Hi everyone,

Code:

+-------------+------------+-----------+
| 3    7   8  | 9  5    6  | 4   1 2   |
| 269  269 29 | 7  4    1  | 8   3 5   |
| 1    5   4  | 8  3    2  | 6   9 7   |
+-------------+------------+-----------+
| 569  8   7  | 15 69   3  | 2   4 169 |
| 4    3   29 | 12 2689 78 | 17  5 169 |
| 2569 269 1  | 4  269  57 | 37  8 369 |
+-------------+------------+-----------+
| 89   1   3  | 6  7    58 | 59  2 4   |
| 28   4   6  | 35 28   9  | 135 7 13  |
| 7    29  5  | 23 1    4  | 39  6 8   |
+-------------+------------+-----------+

Play this puzzle online at the Daily Sudoku site

Quote:
XY-Wing 1,3,5 in r48c4,r8c9 and -1 in r4c9


Ciao Gianni
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TomC



Joined: 30 Oct 2020
Posts: 358
Location: Wales
PostPosted: Sun Oct 09, 2022 9:50 am    Post subject: Reply with quote
r7c6 = 8 to solve

XY chain a-d gives pincers of <5> in a + d to remove <5> from x
Code:

+-------------+--------------+--------------+
| 3    7   8  | 9   5     6  |  4    1  2   |
| 269  269 29 | 7   4     1  |  8    3  5   |
| 1    5   4  | 8   3     2  |  6    9  7   |
+-------------+--------------+--------------+
| 569  8   7  | 15  69    3  |  2    4  169 |
| 4    3   29 | 12  2689  78 |  17   5  169 |
| 2569 269 1  | 4   269  a57 | b37   8  369 |
+-------------+--------------+--------------+
| 89   1   3  | 6   7    x58 | d59   2  4   |
| 28   4   6  | 35  28    9  |  135  7  13  |
| 7    29  5  | 23  1     4  | c39   6  8   |
+-------------+--------------+--------------+
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glesco



Joined: 12 May 2022
Posts: 36
PostPosted: Sun Oct 09, 2022 7:43 pm    Post subject: Reply with quote
An xy-chain anchored at r4c4 & r5c7 eliminates 1 at r5c4 & r4c9
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glesco



Joined: 12 May 2022
Posts: 36
PostPosted: Sun Oct 09, 2022 8:39 pm    Post subject: Reply with quote
An xy-chain anchored at r4c4 & r5c7 eliminates 1 at r5c4 & r4c9
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TomC



Joined: 30 Oct 2020
Posts: 358
Location: Wales
PostPosted: Sun Oct 09, 2022 8:44 pm    Post subject: Reply with quote
r5c4 = 2 to solve

Look at r9c2 = <29>

Two options:
1. Only two <2>'s in c4 so if r9c2=2 then r5c4=2
2. If r9c2=9 then c=3, b=7, r5c7=1 then r5c4=2
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