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Apr 7 VH

 
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Clement



Joined: 24 Apr 2006
Posts: 1111
Location: Dar es Salaam Tanzania

PostPosted: Mon Apr 06, 2015 10:38 pm    Post subject: Apr 7 VH Reply with quote

Code:

+-----------+-----------+---------+
| 7  6   8  | 5  19 49  | 2  14 3 |
| 9  1   5  | 48 3  2   | 7  48 6 |
| 3  4   2  | 78 17 6   | 9  18 5 |
+-----------+-----------+---------+
| 5  7   4  | 6  2  1   | 3  9  8 |
| 1  2   9  | 3  8  7   | 56 56 4 |
| 68 38  36 | 9  4  5   | 1  2  7 |
+-----------+-----------+---------+
| 2  38  36 | 1  5  348 | 46 7  9 |
| 8-4 589 7  | 2  6  489 | 45 3  1 |
| 46 359 1  | 47 79 349 | 8  56 2 |
+-----------+-----------+---------+
XY-Wing 56-4 pivoted in r9c8; r8c1<>4; stte
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kuskey



Joined: 10 Dec 2008
Posts: 141
Location: Pembroke, NH

PostPosted: Tue Apr 07, 2015 6:50 am    Post subject: Apr 7 VH Reply with quote

Clement, after looking at your after-basics code I see much more basic work that can be done. After a fashion, you end up with a BUG+1 in box 8 which is another 1-stepper solution. Many hiddens in this puzzle. I concur with your XY-wing. I solved it 3 times and got 3 identical results.
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Clement



Joined: 24 Apr 2006
Posts: 1111
Location: Dar es Salaam Tanzania

PostPosted: Tue Apr 07, 2015 7:03 am    Post subject: Re: Apr 7 VH Reply with quote

kuskey wrote:
Clement, after looking at your after-basics code I see much more basic work that can be done. After a fashion, you end up with a BUG+1 in box 8 which is another 1-stepper solution. Many hiddens in this puzzle. I concur with your XY-wing.
Thanks kuskey for pointing that out. Uncompleted basics can sometimes(it has happened) result to an invalid path leading to the solution. Thanks.
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dongrave



Joined: 06 Mar 2014
Posts: 568

PostPosted: Wed Apr 08, 2015 2:03 am    Post subject: Reply with quote

I wouldn't really call that much more basic work. To me it looks like he only missed one of the 2 possible naked pairs in column 2 followed by the lone 3 in row 9 (I think).
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