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Apr 20 VH

 
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hughwill



Joined: 05 Apr 2010
Posts: 207
Location: Birmingham UK

PostPosted: Sun Apr 20, 2014 9:29 am    Post subject: Apr 20 VH Reply with quote

After (all?) basics:
Code:

+---------------+------------------+----------+
| 7    46  8    | 1     49    2    | 5  69  3 |
| 269  1   29   | 579   3     57   | 4  679 8 |
| 49   5   3    | 6     479   8    | 79 1   2 |
+---------------+------------------+----------+
| 4569 46  579  | 8     579   567  | 2  3   1 |
| 3    279 2579 | 24579 12579 1257 | 8  479 6 |
| 269  8   1    | 23479 279   367  | 79 479 5 |
+---------------+------------------+----------+
| 8    37  57   | 357   6     9    | 1  2   4 |
| 129  239 4    | 23    8     13   | 6  5   7 |
| 125  27  6    | 257   1257  4    | 3  8   9 |
+---------------+------------------+----------+

Play this puzzle online at the Daily Sudoku site

The 469 XY-Wing pivot r1c2 leaps out as a one-step solution
after the 46 hidden pair is found.
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Marty R.



Joined: 12 Feb 2006
Posts: 5162
Location: Rochester, NY, USA

PostPosted: Sun Apr 20, 2014 3:02 pm    Post subject: Reply with quote

Quote:
After (all?) basics:


As far as I can see you got them all.
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kuskey



Joined: 10 Dec 2008
Posts: 127
Location: Pembroke, NH

PostPosted: Sun Apr 20, 2014 4:16 pm    Post subject: Apr 20 VH Reply with quote

For me, this is the first VH stumper in many a blue moon. Hidden doubles have always done me in. In general, this was troublesome right to the very end. Congrats to the puzzle maker and to you hughwill for a great solution.
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Marty R.



Joined: 12 Feb 2006
Posts: 5162
Location: Rochester, NY, USA

PostPosted: Sun Apr 20, 2014 5:26 pm    Post subject: Re: Apr 20 VH Reply with quote

kuskey wrote:
For me, this is the first VH stumper in many a blue moon. Hidden doubles have always done me in. In general, this was troublesome right to the very end. Congrats to the puzzle maker and to you hughwill for a great solution.


I don't know if some players actually look for hidden pairs, triples, etc. but I know I'd never find them. However, the hidden subsets have complementary naked subsets which I look for and are much easier to find. For example, the hidden pair 46 was found by my spotting the naked quad 2379 in c2.
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