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May 13 VH

 
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Clement



Joined: 24 Apr 2006
Posts: 685
Location: Dar es Salaam Tanzania

PostPosted: Sun May 13, 2012 12:16 am    Post subject: May 13 VH Reply with quote

After the Basics
Code:

+-------------+-----------+-------------+
| 4   2   68  | 1   5 38  | 7   9   36  |
| 9   578 578 | 34  6 78  | 2   34  1   |
| 36  367 1   | 2   9 347 | 5   8   346 |
+-------------+-----------+-------------+
| 2   568 568 | 9   7 346 | 1   3-46 3-45 |
| 7   4   9   | 35  1 -36  | 368 2   58  |
| 56  1   3   | -45  8 2   | 9   46  7   |
+-------------+-----------+-------------+
| 1   9   2   | 68  4 5   | 368 7   38  |
| 368 367 67  | 678 2 1   | 4   5   9   |
| 568 567 4   | 678 3 9   | 68  1   2   |
+-------------+-----------+-------------+
Took me three steps:-
X-Wing on 4 in r26; r4c8<>4; then, XY-Wing 35 58 38 pivoted in r5c9 with pincer transport 3 from r7c9 to r5c7; r5c6<>3 which opens another XY-Wing 34 36 46 pivoted in r4c8; r4c9<>4, r4c6<>4.
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tlanglet



Joined: 17 Oct 2007
Posts: 2461
Location: Northern California Foothills

PostPosted: Sun May 13, 2012 12:59 am    Post subject: Reply with quote

xy-wing(58)r5c9+r7c9/r5c4 plus transported pincer (3)r5c4 => (4)r2c4 => (3)r2c8; r1c9<>3

Also, a couple of locked candidates still exist in the posted grid code but do not influence the xy-wing.

Ted
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Marty R.



Joined: 12 Feb 2006
Posts: 5175
Location: Rochester, NY, USA

PostPosted: Sun May 13, 2012 1:29 am    Post subject: Reply with quote

This was my grid.

Code:

+-------------+----------+-------------+
| 4   2   68  | 1   5 38 | 7   9   36  |
| 9   578 578 | 34  6 78 | 2   34  1   |
| 36  367 1   | 2   9 47 | 5   8   46  |
+-------------+----------+-------------+
| 2   568 568 | 9   7 34 | 1   346 345 |
| 7   4   9   | 35  1 6  | 38  2   358 |
| 56  1   3   | 45  8 2  | 9   46  7   |
+-------------+----------+-------------+
| 1   9   2   | 68  4 5  | 368 7   38  |
| 368 36  67  | 678 2 1  | 4   5   9   |
| 568 567 4   | 678 3 9  | 68  1   2   |
+-------------+----------+-------------+

Play this puzzle online at the Daily Sudoku site

I don't know how Clement got rid of the 3 in r5c9. Sticking with standard VH moves:

X-Wing (4)
XY-Wing (364), pivot r4c8

-or-

XYZ-Wing (346), pivot r4c8
X-Wing (4)

This puzzle is pregnant with URs and the possibility of playing numerous Hidden URs, although I don't know offhand what they'd accomplish.
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Clement



Joined: 24 Apr 2006
Posts: 685
Location: Dar es Salaam Tanzania

PostPosted: Sun May 13, 2012 11:36 am    Post subject: May 13 VH Reply with quote

Marty R. wrote:
This was my grid.

Code:

+-------------+----------+-------------+
| 4   2   68  | 1   5 38 | 7   9   36  |
| 9   578 578 | 34  6 78 | 2   34  1   |
| 36  367 1   | 2   9 47 | 5   8   46  |
+-------------+----------+-------------+
| 2   568 568 | 9   7 34 | 1   346 345 |
| 7   4   9   | 35  1 6  | 38  2   358 |
| 56  1   3   | 45  8 2  | 9   46  7   |
+-------------+----------+-------------+
| 1   9   2   | 68  4 5  | 368 7   38  |
| 368 36  67  | 678 2 1  | 4   5   9   |
| 568 567 4   | 678 3 9  | 68  1   2   |
+-------------+----------+-------------+

Play this puzzle online at the Daily Sudoku site

I don't know how Clement got rid of the 3 in r5c9. Sticking with standard VH moves:

X-Wing (4)
XY-Wing (364), pivot r4c8

-or-

XYZ-Wing (346), pivot r4c8
X-Wing (4)

This puzzle is pregnant with URs and the possibility of playing numerous Hidden URs, although I don't know offhand what they'd accomplish.
I have checked it. Yes, there is a 3 in r5c9. I probably inadvertently erased it when cleaning pencil marks, therefore, leading to an invalid analysis and solution in my above submission Embarassed.
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George Woods



Joined: 28 Mar 2006
Posts: 235
Location: Dorset UK

PostPosted: Sun May 13, 2012 12:31 pm    Post subject: XYZ sufficient? Reply with quote

For me I didn't use the X wing in 4 . After the XYZ wing the resulting 4 in r3c9 menas that the 4s making up the x wing are all solved
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Marty R.



Joined: 12 Feb 2006
Posts: 5175
Location: Rochester, NY, USA

PostPosted: Sun May 13, 2012 3:21 pm    Post subject: Re: XYZ sufficient? Reply with quote

George Woods wrote:
For me I didn't use the X wing in 4 . After the XYZ wing the resulting 4 in r3c9 menas that the 4s making up the x wing are all solved


Sometime we (I) can't see the forest for the trees and I was so locked in to boxes 56 that I failed to note that 4 in r3c9. Good spot.
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arkietech



Joined: 31 Jul 2008
Posts: 1730
Location: Northwest Arkansas USA

PostPosted: Sun May 13, 2012 8:57 pm    Post subject: Reply with quote

Code:
 *--------------------------------------------------*
 | 4    2    68   | 1    5    38   | 7    9    36   |
 | 9    578  578  |*34   6    78   | 2   *34   1    |
 | 36   367  1    | 2    9    47   | 5    8    46   |
 |----------------+----------------+----------------|
 | 2    568  568  | 9    7    4-3  | 1   *346  345  |
 | 7    4    9    |*35   1    6    | 8-3  2    58-3 |
 | 56   1    3    | 45   8    2    | 9    46   7    |
 |----------------+----------------+----------------|
 | 1    9    2    | 68   4    5    | 368  7    38   |
 | 368  367  67   | 678  2    1    | 4    5    9    |
 | 568  567  4    | 678  3    9    | 68   1    2    |
 *--------------------------------------------------*
skyscraper
(3)r5c4=r2c4-r2c8=r5c8 => r4c6,r5c79<>3; stte
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