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Oct 6 VH

 
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hughwill



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

PostPosted: Tue Oct 06, 2015 9:09 am    Post subject: Oct 6 VH Reply with quote

After basics:
Code:

+--------+----------+-----------+
| 6 2 39 | 57 357 1 | 8 4   79  |
| 4 1 7  | 6  9   8 | 3 2   5   |
| 5 8 39 | 2  37  4 | 1 79  6   |
+--------+----------+-----------+
| 2 3 1  | 9  6   7 | 4 5   8   |
| 9 6 5  | 8  4   2 | 7 13  13  |
| 7 4 8  | 3  1   5 | 9 6   2   |
+--------+----------+-----------+
| 1 5 24 | 47 278 3 | 6 789 479 |
| 3 7 6  | 45 58  9 | 2 18  14  |
| 8 9 24 | 1  27  6 | 5 37  347 |
+--------+----------+-----------+

Play this puzzle online at the Daily Sudoku site
A two-stepper* for a change:
Quote:
27-4 XY Wing pivot r9c5 followed by a 49-7 XY Wing pivot r7c9

*Unless someone saw it in one...

Hugh
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JC Van Hay



Joined: 13 Jun 2010
Posts: 494
Location: Charleroi, Belgium

PostPosted: Tue Oct 06, 2015 11:10 am    Post subject: Reply with quote

Code:
+----------+----------------+---------------+
| 6  2  39 | -7(5)  357   1 | 8  4      79  |
| 4  1  7  | 6      9     8 | 3  2      5   |
| 5  8  39 | 2      3(7)  4 | 1  (79)   6   |
+----------+----------------+---------------+
| 2  3  1  | 9      6     7 | 4  5      8   |
| 9  6  5  | 8      4     2 | 7  13     13  |
| 7  4  8  | 3      1     5 | 9  6      2   |
+----------+----------------+---------------+
| 1  5  24 | 47     278   3 | 6  7(89)  479 |
| 3  7  6  | 4(5)   (58)  9 | 2  1(8)   14  |
| 8  9  24 | 1      27    6 | 5  37     347 |
+----------+----------------+---------------+
5r1c4=5r8c4-(5=8)r8c5-8r8c8=(8-9)r7c8=(9-7)r3c8=7r3c5 :=> r1c4≠7; stte
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bat999



Joined: 09 Jul 2015
Posts: 55
Location: UK

PostPosted: Tue Oct 06, 2015 8:05 pm    Post subject: Reply with quote

Code:
.----------.--------------.----------------.
| 6  2  39 |  5-7  357  1 | 8   4    a79   |
| 4  1  7  |  6    9    8 | 3   2     5    |
| 5  8  39 |  2    37   4 | 1  b79    6    |
:----------+--------------+----------------:
| 2  3  1  |  9    6    7 | 4   5     8    |
| 9  6  5  |  8    4    2 | 7  b13    13   |
| 7  4  8  |  3    1    5 | 9   6     2    |
:----------+--------------+----------------:
| 1  5  24 | c47   278  3 | 6   789   49-7 |
| 3  7  6  | c45  c58   9 | 2  b18    14   |
| 8  9  24 |  1    27   6 | 5  b37    347  |
'----------'--------------'----------------'
(7=9)r1c9 - (9=8)r3589c8 - (8=7)r7c4,r8c45 => -7 r1c4,r7c9; stte
Cool
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roaa



Joined: 18 Apr 2009
Posts: 112
Location: Sweden

PostPosted: Thu Oct 08, 2015 6:47 pm    Post subject: Oct 6 VH Reply with quote

The XY-Wing 247, pivot r7c4, solves it in one step.
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Marty R.



Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA

PostPosted: Fri Oct 09, 2015 12:05 am    Post subject: Re: Oct 6 VH Reply with quote

roaa wrote:
The XY-Wing 247, pivot r7c4, solves it in one step.


I couldn't do it in one step. Got stuck here.

Code:

+--------+----------+---------+
| 6 2 39 | 57 357 1 | 8 4  79 |
| 4 1 7  | 6  9   8 | 3 2  5  |
| 5 8 39 | 2  37  4 | 1 79 6  |
+--------+----------+---------+
| 2 3 1  | 9  6   7 | 4 5  8  |
| 9 6 5  | 8  4   2 | 7 13 13 |
| 7 4 8  | 3  1   5 | 9 6  2  |
+--------+----------+---------+
| 1 5 2  | 47 78  3 | 6 89 49 |
| 3 7 6  | 45 58  9 | 2 18 14 |
| 8 9 4  | 1  2   6 | 5 37 37 |
+--------+----------+---------+

Play this puzzle online at the Daily Sudoku site
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dongrave



Joined: 06 Mar 2014
Posts: 568

PostPosted: Fri Oct 09, 2015 1:58 am    Post subject: Reply with quote

Me too Marty. I think Roaa just had an off day (because it doesn't look like it solves it to me either). Roaa's and Hugh's 1st XY Wing both look like they get you to Marty's grid (I think). I was surprised to see Hugh's 2nd move though because I missed his 49-7 XY Wing and instead saw the 89-7 XY Wing with pivot in r7c8 so r3c5<>7 which also solves it.
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