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Sep 03 VH

 
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ZeroAssoluto



Joined: 05 Feb 2017
Posts: 872
Location: Rimini, Italy
PostPosted: Sun Sep 03, 2023 8:50 am    Post subject: Sep 03 VH Reply with quote
Hi everyone,

Code:

+------------+---------+-------------+
| 9   3   2  | 7  6 1  | 5   8   4   |
| 17  5   17 | 4  9 8  | 2   3   6   |
| 46  8   46 | 35 2 35 | 9   7   1   |
+------------+---------+-------------+
| 347 49  8  | 35 1 2  | 6   45  79  |
| 2   6   17 | 9  8 45 | 47  145 3   |
| 134 149 5  | 6  7 34 | 48  124 289 |
+------------+---------+-------------+
| 5   2   46 | 1  3 67 | 478 9   78  |
| 146 14  9  | 8  5 67 | 3   24  27  |
| 8   7   3  | 2  4 9  | 1   6   5   |
+------------+---------+-------------+

Play this puzzle online at the Daily Sudoku site

first step

XY-Wing 4,7,9 in r4c29,r5c7 and -4 in r4c8

Code:

+-----------+--------+----------+
| 9   3  2  | 7 6 1  | 5  8  4  |
| 17  5  17 | 4 9 8  | 2  3  6  |
| 46  8  46 | 5 2 3  | 9  7  1  |
+-----------+--------+----------+
| 47  49 8  | 3 1 2  | 6  5  79 |
| 2   6  17 | 9 8 5  | 47 14 3  |
| 3   19 5  | 6 7 4  | 8  12 29 |
+-----------+--------+----------+
| 5   2  46 | 1 3 67 | 47 9  78 |
| 146 14 9  | 8 5 67 | 3  24 27 |
| 8   7  3  | 2 4 9  | 1  6  5  |
+-----------+--------+----------+

Play this puzzle online at the Daily Sudoku site

second step

XY-Wing 1,2,4 in r68c8,r8c2 and -1 in r6c2

or in only one step

AIC in r4c2
if r4c2 = 4 -4 in r4c8,r8c2
if r4c2 = 9 r4c9 = 7 r8c9 = 2 r8c8 = 4 and -4 in r4c8,r8c2

Ciao Gianni
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immpy



Joined: 06 May 2017
Posts: 570
PostPosted: Sun Sep 03, 2023 3:57 pm    Post subject: Reply with quote
Can also use a BUG+1 for the second step. r8c1=4

cheers...immp
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