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May 13 VH

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Clement

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

Posted: Sun May 13, 2012 12:16 am Post subject: May 13 VH

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.

tlanglet

Joined: 17 Oct 2007
Posts: 2468
Location: Northern California Foothills

Posted: Sun May 13, 2012 12:59 am Post subject:

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

Marty R.

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

Posted: Sun May 13, 2012 1:29 am Post subject:

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.

Clement

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

Posted: Sun May 13, 2012 11:36 am Post subject: May 13 VH

Marty R. wrote:

This was my grid.

Code:

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

George Woods

Joined: 28 Mar 2006
Posts: 304
Location: Dorset UK

Posted: Sun May 13, 2012 12:31 pm Post subject: XYZ sufficient?

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

Marty R.

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

Posted: Sun May 13, 2012 3:21 pm Post subject: Re: XYZ sufficient?

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.

arkietech

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

Posted: Sun May 13, 2012 8:57 pm Post subject:

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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