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May 16 VH

 
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yeoks



Joined: 16 May 2010
Posts: 33

PostPosted: Sun May 16, 2010 6:38 am    Post subject: May 16 VH Reply with quote

XY-Wing 16 15 56 takes out 6 in r7c6
followed by another 15 25 12 removing 1 from r3c3
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peterj



Joined: 26 Mar 2010
Posts: 974
Location: London, UK

PostPosted: Sun May 16, 2010 10:39 am    Post subject: Reply with quote

This one didn't seem to want to solve any other way than the 2 xy-wings for me!

Though I did waste 10 minutes of my life on a long xy-chain starting (5=1)r1c1 and ending (6=5)r7c7 eliminating 5 from r7c1. This left only the first of the xy-wings.
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Kdelle



Joined: 20 Mar 2008
Posts: 59
Location: Hudson, NH

PostPosted: Sun May 16, 2010 12:47 pm    Post subject: Reply with quote

I needed two wings also, but I used the 258 XY wing as my second.

Kathy
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Clement



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

PostPosted: Sun May 16, 2010 3:02 pm    Post subject: Reply with quote

yeoks,
I cannot see the XY-Wing 16 15 56. Can you indicate the cells where the pivot and pincers are which take out 6 in r7c6.
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Marty R.



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

PostPosted: Sun May 16, 2010 3:35 pm    Post subject: Reply with quote

Clement wrote:
yeoks,
I cannot see the XY-Wing 16 15 56. Can you indicate the cells where the pivot and pincers are which take out 6 in r7c6.

Pivot in r2c7.


Code:

+-------------+-------------+--------------+
| 15  36  9   | 125 26  8   | 7  345  1345 |
| 8   36  4   | 9   7   16  | 15 35   2    |
| 7   2   15  | 15  3   4   | 8  6    9    |
+-------------+-------------+--------------+
| 24  1   28  | 6   9   5   | 3  248  7    |
| 249 89  6   | 3   1   7   | 45 2458 458  |
| 3   5   7   | 8   4   2   | 16 9    16   |
+-------------+-------------+--------------+
| 259 4   3   | 7   268 69  | 56 1    568  |
| 6   78  12  | 12  5   3   | 9  478  48   |
| 159 789 158 | 4   68  169 | 2  3578 3568 |
+-------------+-------------+--------------+

Play this puzzle online at the Daily Sudoku site
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keith



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

PostPosted: Sun May 16, 2010 5:11 pm    Post subject: Reply with quote

Marty R. wrote:
Clement wrote:
yeoks,
I cannot see the XY-Wing 16 15 56. Can you indicate the cells where the pivot and pincers are which take out 6 in r7c6.

Pivot in r2c7.


Code:

+-------------+-------------+--------------+
| 15  36  9   | 125 26  8   | 7  345  1345 |
| 8   36  4   | 9   7   16  | 15 35   2    |
| 7   2   15  | 15  3   4   | 8  6    9    |
+-------------+-------------+--------------+
| 24  1   28  | 6   9   5   | 3  248  7    |
| 249 89  6   | 3   1   7   | 45 2458 458  |
| 3   5   7   | 8   4   2   | 16 9    16   |
+-------------+-------------+--------------+
| 259 4   3   | 7   268 69  | 56 1    568  |
| 6   78  12  | 12  5   3   | 9  478  48   |
| 159 789 158 | 4   68  169 | 2  3578 3568 |
+-------------+-------------+--------------+

Play this puzzle online at the Daily Sudoku site
The XY-wing is in R24C67. The rectangular ones are tough to see!

(Maybe it needs a different name Razz )

Marty,

In this grid you can solve R5C6 as a single, and then R4C1.

Keith
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Marty R.



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

PostPosted: Sun May 16, 2010 5:17 pm    Post subject: Reply with quote

Keith, sorry, I don't understand either of your two statements. Question
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George Woods



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

PostPosted: Sun May 16, 2010 5:32 pm    Post subject: xy wing Reply with quote

Marty R. wrote:
Keith, sorry, I don't understand either of your two statements. Question


if you look in row 2 you will see a 16 and a 15 so if you are to find an x wing one of thes cells will "see" a 56 vertically


Hope this helps
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peterj



Joined: 26 Mar 2010
Posts: 974
Location: London, UK

PostPosted: Sun May 16, 2010 6:01 pm    Post subject: Reply with quote

By rectangular I guess Keith means the 'three block' type of xy-wing.

They are definitely much harder to see (for me) especially if they are a long way apart - I often stumble on them when looking for xy-chains (my standard move after colouring when I am lacking inspiration!)
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keith



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

PostPosted: Sun May 16, 2010 6:05 pm    Post subject: Reply with quote

[quote="keith"]
Marty R. wrote:
Clement wrote:
yeoks,
I cannot see the XY-Wing 16 15 56. Can you indicate the cells where the pivot and pincers are which take out 6 in r7c6.


The XY-wing is in R24C67. The rectangular ones are tough to see!

(Maybe it needs a different name Razz )

Marty,

In this grid you can solve R5C6 as a single, and then R4C1.

Keith


OOPS! Should be:
The XY-wing is in R27C67.

If the three cells of the XY-wing (one pivot plus two pincers) lie on the corners of a rectangle, there can be an elimination in only one cell. I find these hard to spot.

The comment about the name is a jab at those who would name every variant of two strong links.

OOPS 2! Should be:
In this grid you can solve R5C7as a single, and then R4C1. They are both 4.


Keith Embarassed Embarassed
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Wendy W



Joined: 04 Feb 2008
Posts: 144

PostPosted: Sun May 16, 2010 7:37 pm    Post subject: Reply with quote

Two xy-wings for me, just like yeoks: 156 and 125. There was also an xyz-wing 568 but it wasn't necessary.
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keith



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

PostPosted: Sun May 16, 2010 9:45 pm    Post subject: Reply with quote

Wendy W wrote:
There was also an xyz-wing 568 but it wasn't necessary.
There is also an unnecessary X-wing. Cool

Keith
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Wendy W



Joined: 04 Feb 2008
Posts: 144

PostPosted: Mon May 17, 2010 3:04 pm    Post subject: Reply with quote

Geez, Keith, you had to go and point that out, didn't you! Very Happy My problem is a lack of patience: Once I find a wing of any sort, I just don't feel like going back and doing the meticulous basics all over again -- I just want to find more!
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