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Dec 20 Hard (with VH solutions)

 
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hughwill



Joined: 05 Apr 2010
Posts: 424
Location: Birmingham UK

PostPosted: Tue Dec 20, 2016 9:41 am    Post subject: Dec 20 Hard (with VH solutions) Reply with quote

We don't normally discuss Hards but


After most (but not all) basics
Code:

+------------+----------+------------+
| 38 38   7  | 1  46  2 | 9  46  5   |
| 5  1    2  | 46 8   9 | 36 467 367 |
| 6  4    9  | 5  3   7 | 2  1   8   |
+------------+----------+------------+
| 37 35   6  | 8  2   1 | 4  57  9   |
| 78 2    58 | 9  567 4 | 1  3   67  |
| 1  9    4  | 67 567 3 | 8  567 2   |
+------------+----------+------------+
| 4  3678 38 | 37 9   5 | 36 2   1   |
| 2  356  35 | 34 1   8 | 7  9   346 |
| 9  37   1  | 2  47  6 | 5  8   34  |
+------------+----------+------------+

Play this puzzle online at the Daily Sudoku site

At this point I didn't bother with the basics solution as there are no less
than 3 XY-wings which convert this to an 'easy' puzzle: 2 47-3 wings both
pivoted on r9c5 and a 58-3 pivoted on r5c3. Makes the humble 'Hard'
a bit more interesting...
Hugh

PS Of course the box-line interaction removing the 3s from c2 in Box 7
sorts it out but that's not much fun......
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