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Dec 11th VH

 
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storm_norm



Joined: 18 Oct 2007
Posts: 1741

PostPosted: Tue Dec 11, 2007 2:57 am    Post subject: Dec 11th VH Reply with quote

Code:
 6       137     23      | 279     5       8       | 19      129     4
 28      18      9       | 3       4       12      | 6       7       5
 27      4       5       | 279     127     6       | 8       129     3
------------------------------------------------------------------------
 358     58      7       | 1       2389    23      | 29      4       6
 348     9       16      | 46      2378    237     | 127     5       1278
 48      2       16      | 46      789     5       | 3       19      178
------------------------------------------------------------------------
 1       37      23      | 5       6       9       | 4       8       27
 9       6       8       | 27      127     4       | 5       3       127
 257     57      4       | 8       1237    1237    | 127     6       9
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alanr555



Joined: 01 Aug 2005
Posts: 198
Location: Bideford Devon EX39

PostPosted: Tue Dec 11, 2007 3:54 am    Post subject: Reply with quote

Yes.
I agree with Storm-Norm's result.
I got stuck at the same point.

Apologies for the duplicate topic - composing in the same timeframe.
Perhaps SamGJ can merge the topics for us.
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storm_norm



Joined: 18 Oct 2007
Posts: 1741

PostPosted: Tue Dec 11, 2007 3:59 am    Post subject: Reply with quote

hi alanr555,

my grid is how it would look after basic moves such as naked pairs, box line interactions etc.

however, I have not given a solution because it is still early, I don't want to ruin it yet. lol

Norm
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Marty R.



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

PostPosted: Tue Dec 11, 2007 6:19 am    Post subject: Re: Dec 11th VH Reply with quote

storm_norm wrote:
Code:
 6       137     23      | 279     5       8       | 19      129     4
 28      18      9       | 3       4       12      | 6       7       5
 27      4       5       | 279     127     6       | 8       129     3
------------------------------------------------------------------------
 358     58      7       | 1       2389    23      | 29      4       6
 348     9       16      | 46      2378    237     | 127     5       1278
 48      2       16      | 46      789     5       | 3       19      178
------------------------------------------------------------------------
 1       37      23      | 5       6       9       | 4       8       27
 9       6       8       | 27      127     4       | 5       3       127
 257     57      4       | 8       1237    1237    | 127     6       9

Somebody has to say something. An XYZ-Wing pivoted in r3c5 takes out a 2 from r3c4, then the 27 W-Wing with pincer coloring removes the 2 from r1c4. Then somewhere along the line, I had a Finned X-Wing on 1 to finish it off.
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storm_norm



Joined: 18 Oct 2007
Posts: 1741

PostPosted: Tue Dec 11, 2007 6:28 am    Post subject: Reply with quote

Code:
x       x                 xxxxxxx
 x     x                       x
  x   x                       x
   x x                       x
    x         WING on       x
   x x                     x
  x   x
 x     x
x       x
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nataraj



Joined: 03 Aug 2007
Posts: 1048
Location: near Vienna, Austria

PostPosted: Tue Dec 11, 2007 7:07 am    Post subject: Reply with quote

aside from basic moves...

xwing on 6 (c34), later
xwing on 7 (c67)

but some eliminations took me a long time to see.

BTW how come you guys got the puzzle early today. Have the timezones benn mixed up? Smile
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Johan



Joined: 25 Jun 2007
Posts: 206
Location: Bornem Belgium

PostPosted: Tue Dec 11, 2007 10:25 am    Post subject: Reply with quote

A [27-127-12] XYZ-wing and a swordfish* on <7> in C167. The x-wing mentioned by Norm could have saved me a lot of time, but I missed that one completely.

Code:

+--------------------------+--------------------------+--------------------------+
| 6         137      23    | 279       5        8     | 19        129     4      |
| 28        18       9     | 3         4        12    | 6         7       5      |
|*27        4        5     | 2-[7]9    12-[7]  *6     |*8         129     3      |
+--------------------------+--------------------------+--------------------------+
| 358       58       7     | 1         2389     23    | 29        4       6      |
|*348       9        16    | 46        23-[7]8 *237   |*127       5       12-[7]8|
| 48        2        16    | 46        789      5     | 3         19      178    |
+--------------------------+--------------------------+--------------------------+
| 1         37       23    | 5         6        9     | 4         8       27     |
| 9         6        8     | 27        127      4     | 5         3       127    |
|*257       5-[7]    4     | 8         123-[7] *1237  |*127       6       9      |
+--------------------------+--------------------------+--------------------------+
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Victor



Joined: 29 Sep 2005
Posts: 207
Location: NI

PostPosted: Tue Dec 11, 2007 11:10 am    Post subject: Reply with quote

Nice 'rich' puzzle in terms of basic moves. The X-Wing in 7s in rows 6 & 8 pretty well finishes it. (Took me a while also - searching for XY- or XYZ - wings.)
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Asellus



Joined: 05 Jun 2007
Posts: 865
Location: Sonoma County, CA, USA

PostPosted: Tue Dec 11, 2007 12:19 pm    Post subject: Reply with quote

A comment on the elimination of those <2>s in r13c4...

The W-Wing alone eliminates both, one directly and one by transporting the pincer <2> in r3c1 to r1c8 via the strong link in Box 3.

And, the XYZ Wing with pivot r3c5 also eliminates both, one directly and one by transporting the same <2> to the same cell in the same manner.
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Victor



Joined: 29 Sep 2005
Posts: 207
Location: NI

PostPosted: Tue Dec 11, 2007 12:37 pm    Post subject: Reply with quote

Sorry, forgot what I'd done & wrote carelessly - the X-wing is in C 6 & 7
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cgordon



Joined: 04 May 2007
Posts: 769
Location: ontario, canada

PostPosted: Tue Dec 11, 2007 2:26 pm    Post subject: Reply with quote

I found a quad <3458> in Box 4 and then just used two X-wings:
for <3> R17: then <7> C67.
I'm not actually convinced that X-wings should be a VH technique. I used them even before I'd heard about wings - they are so obvious. In fact I got totally stuck with yesterday's Hard puzzle (Dec 10) and am sure it could only be solved with a simple x-wing. But I may be wrong - I was wrong once before (maybe twice).
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alanr555



Joined: 01 Aug 2005
Posts: 198
Location: Bideford Devon EX39

PostPosted: Tue Dec 11, 2007 2:34 pm    Post subject: Reply with quote

Looking through the comments made so far, I am amazed at
the breadth of techniques posited.

Storm-Norm provided the essential clue. The resolution boils
down to three stages

a) All the Mandatory Pairs preliminary work.
This gives the grid posted by Storm-Norm at the head of this topic.

b) Recognition of a simple rectangle in cols6,7 rows 5,9.

c) Full resolution using simple (sole candidate) techniques.

As always, the challenge is to identify the crucial factor. My thanks
go to Storm-Norm for doing this for me in this case. The detail
development of my understanding of the resolution is in the other
topic relating to this puzzle.
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storm_norm



Joined: 18 Oct 2007
Posts: 1741

PostPosted: Tue Dec 11, 2007 10:02 pm    Post subject: Reply with quote

Quote:
BTW how come you guys got the puzzle early today. Have the timezones benn mixed up?


well, depending how you look at it, its always midnight somewhere in the world. so if I were to "syndicate" this puzzle, I would need it fairly early in the day. hope that is a big enough hint.

norm
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