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Nov 29 VH

 
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hughwill



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

PostPosted: Sat Nov 29, 2014 10:36 am    Post subject: Nov 29 VH Reply with quote

This is where I got to with basics:
Code:

+---------------+----------+--------------+
| 18   9    47  | 3   2 5  | 147  478  6  |
| 3    156  257 | 4   8 16 | 9    257  17 |
| 1568 1456 245 | 16  7 9  | 1245 2458 3  |
+---------------+----------+--------------+
| 9    8    6   | 5   1 2  | 3    47   47 |
| 2    7    3   | 8   9 4  | 6    1    5  |
| 15   145  45  | 7   6 3  | 8    9    2  |
+---------------+----------+--------------+
| 4    256  9   | 126 3 7  | 125  256  8  |
| 56   3    1   | 26  4 8  | 257  2567 9  |
| 7    26   8   | 9   5 16 | 124  3    14 |
+---------------+----------+--------------+

Play this puzzle online at the Daily Sudoku site

I did it, but it took me 2 X-wings, 2 XY-wing and loads of XYZ-wings.
Too many to list here - surely someone did it quicker using 'classic'
techniques?

If not this is the most complex we've seen for a while...

Hugh


Last edited by hughwill on Sat Nov 29, 2014 1:33 pm; edited 1 time in total
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arkietech



Joined: 31 Jul 2008
Posts: 1834
Location: Northwest Arkansas USA

PostPosted: Sat Nov 29, 2014 12:41 pm    Post subject: Reply with quote

Code:
 *-----------------------------------------------------------*
 |b18    9    a47    | 3     2     5     |a147  a478   6     |
 | 3     156   257   | 4     8     16    | 9     257   17    |
 | 1568  1456  245   | 16    7     9     | 1245  2458  3     |
 |-------------------+-------------------+-------------------|
 | 9     8     6     | 5     1     2     | 3     47    47    |
 | 2     7     3     | 8     9     4     | 6     1     5     |
 |b15    145   45    | 7     6     3     | 8     9     2     |
 |-------------------+-------------------+-------------------|
 | 4     256   9     | 126   3     7     | 25-1  256   8     |
 |b56    3     1     | 26    4     8     | 257   2567  9     |
 | 7    c26    8     | 9     5     16    |c124   3    c14    |
 *-----------------------------------------------------------*
(1=8)r1c378-(8=6)r168c1-(6=41)r9c279 => -1r7c7; ste
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dongrave



Joined: 06 Mar 2014
Posts: 568

PostPosted: Sat Nov 29, 2014 3:24 pm    Post subject: Re: Nov 29 VH Reply with quote

hughwill wrote:
This is where I got to with basics:
Code:

+---------------+----------+--------------+
| 18   9    47  | 3   2 5  | 147  478  6  |
| 3    156  257 | 4   8 16 | 9    257  17 |
| 1568 1456 245 | 16  7 9  | 1245 2458 3  |
+---------------+----------+--------------+
| 9    8    6   | 5   1 2  | 3    47   47 |
| 2    7    3   | 8   9 4  | 6    1    5  |
| 15   145  45  | 7   6 3  | 8    9    2  |
+---------------+----------+--------------+
| 4    256  9   | 126 3 7  | 125  256  8  |
| 56   3    1   | 26  4 8  | 257  2567 9  |
| 7    26   8   | 9   5 16 | 124  3    14 |
+---------------+----------+--------------+

Play this puzzle online at the Daily Sudoku site

I did it, but it took me 2 X-wings, 2 XY-wing and loads of XYZ-wings.
Too many to list here - surely someone did it quicker using 'classic'
techniques?

If not this is the most complex we've seen for a while...

Hugh


What the heck? I surely appreciate Dan's single step solution but since I know that all VH's on this site can be solved using just 'standard' VH moves (i.e. X, XY, and XYZ wings), I always look for that solution and like Hugh, I lost count! (I think it was something like 7 or 8!) Is there a simpler solution just using the standard VH moves? If so, I surely didn't see it! And if not, then I've only got one thing to say - Holy crow!
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arkietech



Joined: 31 Jul 2008
Posts: 1834
Location: Northwest Arkansas USA

PostPosted: Sat Nov 29, 2014 10:24 pm    Post subject: Re: Nov 29 VH Reply with quote

dongrave wrote:

What the heck? I surely appreciate Dan's single step solution but since I know that all VH's on this site can be solved using just 'standard' VH moves (i.e. X, XY, and XYZ wings), I always look for that solution and like Hugh, I lost count! (I think it was something like 7 or 8!) Is there a simpler solution just using the standard VH moves? If so, I surely didn't see it! And if not, then I've only got one thing to say - Holy crow!


using only X, XY, and XYZ wings

I got:

XYZ-Wing 147r1c37,r2c9 => -7r1c8
X-Wing 1c69r29 => -1r2c2,r9c7
XY-Wing 184r1c18,r3c2 => -4r1c3,r3c78
X-Wing 6r29c26 => -6r7c2
XY-Wing 562r7c2,r8c14 => -2r7c4
XYZ-Wing 256r7c28,r8c8 => -5r7c7
XYZ-Wing 168r13c1,r3c4 => -1r3c2

Why limit your self?
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keith



Joined: 19 Sep 2005
Posts: 3355
Location: near Detroit, Michigan, USA

PostPosted: Sun Nov 30, 2014 7:34 am    Post subject: Reply with quote

Pretty amazing in that all seven steps seem to be required.

I usually do solve these puzzles using only the methods known to be required. One man's restriction is another man's challenge.

In the same way, I do not use pencil marks to solve other than this site's "Very Hard" puzzles.

Keith
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JC Van Hay



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

PostPosted: Sun Nov 30, 2014 10:18 am    Post subject: Reply with quote

From the 2 solutions of C9 : r2c9=1 or 7 => r8c1=6; stte
A short interpretation :
Code:
+--------------------+--------------+-----------------+
| (18)     9     47  | 3      2  5  | 47(1)  478   6  |
| 3        156   257 | 4      8  16 | 9      257   17 |
| 15-6(8)  1456  245 | (16)   7  9  | 1245   2458  3  |
+--------------------+--------------+-----------------+
| 9        8     6   | 5      1  2  | 3      47    47 |
| 2        7     3   | 8      9  4  | 6      1     5  |
| 15       145   45  | 7      6  3  | 8      9     2  |
+--------------------+--------------+-----------------+
| 4        256   9   | 26(1)  3  7  | 25(1)  256   8  |
| 56       3     1   | 26     4  8  | 257    2567  9  |
| 7        2     8   | 9      5  16 | 124    3     14 |
+--------------------+--------------+-----------------+
[(6=1)r3c4-1r7c4=1r7c7-1r1c7=(1-8)r1c1=8r3c1]-6r3c1=6r8c1; stte
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lucygp



Joined: 29 Dec 2014
Posts: 3

PostPosted: Mon Dec 29, 2014 8:02 am    Post subject: Reply with quote

Is there a simpler solution just using the standard VH moves?












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