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Feb 18 VH

 
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ZeroAssoluto



Joined: 05 Feb 2017
Posts: 942
Location: Rimini, Italy
PostPosted: Thu Feb 18, 2021 9:08 am    Post subject: Feb 18 VH Reply with quote
Hi everyone,

Code:

+-------------+------------+-----------+
| 467 8   467 | 5  1   2   | 9  3  67  |
| 567 567 3   | 89 789 4   | 68 1  2   |
| 1   2   9   | 6  78  3   | 58 57 4   |
+-------------+------------+-----------+
| 46  3   8   | 7  2   5   | 46 9  1   |
| 457 1   47  | 3  689 89  | 45 2  68  |
| 9   56  2   | 4  68  1   | 7  58 3   |
+-------------+------------+-----------+
| 2   79  1   | 89 4   6   | 3  78 5   |
| 3   679 67  | 2  5   789 | 1  4  789 |
| 8   4   5   | 1  3   79  | 2  6  79  |
+-------------+------------+-----------+

Play this puzzle online at the Daily Sudoku site

XY-Wing 5,7,8 in r3c58,r6c8 and -8 in r6c5

Ciao Gianni
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Jeff



Joined: 06 May 2007
Posts: 46
PostPosted: Sun Feb 28, 2021 6:09 pm    Post subject: Reply with quote
Code:

+-------------+------------+------------+
| 467 8   467 | 5  1   2   | 9  3   67  |
| 567 567 3   | 89 789 4   | 68 1   2   |
| 1   2   9   | 6  78  3   | 58 57  4   |
+-------------+------------+------------+
| 469 3   8   | 7  2   5   | 46 69  1   |
| 457 1   47  | 3  69  89  | 45 2   689 |
| 569 56  2   | 4  689 1   | 7  589 3   |
+-------------+------------+------------+
| 2   79  1   | 89 4   6   | 3  789 5   |
| 3   679 67  | 2  5   789 | 1  4   789 |
| 8   4   5   | 1  3   79  | 2  6   79  |
+-------------+------------+------------+

I need some help. Here is where I ended up. I cannot figure out how to boil it down further to what you show. Please help. Thanks
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ZeroAssoluto



Joined: 05 Feb 2017
Posts: 942
Location: Rimini, Italy
PostPosted: Sun Feb 28, 2021 7:44 pm    Post subject: Reply with quote
Hi Jeff,

r9c8 = 6 so r4c8 = 9
and you can get to the situation I show where to use the xy-wing

Ciao Gianni
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Jeff



Joined: 06 May 2007
Posts: 46
PostPosted: Sun Feb 28, 2021 10:34 pm    Post subject: Reply with quote
Wow! I can't believe that I missed that. Many thanks,

Jeff
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