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April 29 VH

 
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Clement



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

PostPosted: Wed Apr 28, 2010 11:17 pm    Post subject: April 29 VH Reply with quote

W-Wing 23 with strong link 2 in row 3 removes 3 in r4c7 solving the puzzle.
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prakash



Joined: 02 Jan 2008
Posts: 67
Location: New Jersey, USA

PostPosted: Thu Apr 29, 2010 1:50 am    Post subject: Reply with quote

A XY wing (169) pivot r4c6 followed by another XY wing (127) pivot r5c8 clears it up.
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Marty R.



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

PostPosted: Thu Apr 29, 2010 3:49 am    Post subject: Reply with quote

Also a Skyscraper on 2 in columns 39.
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peterj



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

PostPosted: Thu Apr 29, 2010 7:55 am    Post subject: Reply with quote

Also one of I suspect many xy-chains that solve it..

(2=7)r5c3-(7=2)r2c3-(2=3)r2c9-(3=1)r7c9-(1=2)r4c9; r4c1<>2, r5c7<>2

But probably in sledgehammer territory already..
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roaa



Joined: 18 Apr 2009
Posts: 112
Location: Sweden

PostPosted: Thu Apr 29, 2010 11:50 am    Post subject: Reply with quote

The xy-wing 127 in rows 4 & 5 solves it in one step.
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arkietech



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

PostPosted: Thu Apr 29, 2010 1:07 pm    Post subject: Reply with quote

I found four different one step solutions:
2 skyscraper 2's
xy-wing 127
turbot taking out a 2 in r5c7
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tlanglet



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

PostPosted: Thu Apr 29, 2010 4:03 pm    Post subject: Reply with quote

I found a xy-wing 2-34 with vertex 24 in r3c1 and pseudocell pincer 34 in r35c7; r4c7<>3
This step is simply another view of the w=wing 23 already posted.

Ted
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cgordon



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

PostPosted: Thu Apr 29, 2010 10:56 pm    Post subject: Reply with quote

Same skyscraper as Marty. Unquestionably the simplest and most efficient solution. Quite frankly I dismiss other solutions as rather tiresome and irrelevant. Evil or Very Mad Evil or Very Mad
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Wendy W



Joined: 04 Feb 2008
Posts: 144

PostPosted: Sat May 01, 2010 9:49 pm    Post subject: Reply with quote

I don't quite see it like that: It just depends which "tool" you happen to see first. For me it was XY-567, then the much-mentioned XY-127. Does one start at the top or the bottom? It's arbitrary.
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cgordon



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

PostPosted: Sat May 01, 2010 10:26 pm    Post subject: Reply with quote

Quote:
I don't quite see it like that: It just depends which "tool" you happen to see first. For me it was XY-567, then the much-mentioned XY-127. Does one start at the top or the bottom? It's arbitrary.


Sorry, it was an unfunny attempt to sound pompous – though in this case I am of course perfectly right. There should be a grading by which one-steppers get respect for the simplest solutions - which in my opinion go Bug+1s, Skyscrapers, URs, X-wings, ER’s, xy wings ……
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Mogulmeister



Joined: 03 May 2007
Posts: 1151

PostPosted: Sat May 01, 2010 10:36 pm    Post subject: Reply with quote

Well, as has been discussed elsewhere on this board many times, different things are spotted by people depending on their proclivities.
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tlanglet



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

PostPosted: Sun May 02, 2010 1:13 am    Post subject: Reply with quote

If you are judging "simplest solution", I would first suggest a definition of the term.

For example, it was declared that a skyscraper was the best. But look at the lowly turbot offered by arkietech. Comparing with the skyscraper we note that:
both are single digit patterns; in this case the same digit, 2
both steps involve four bivalue cells; two of which in this case are identical
both make a single identical deletion, but the skyscraper makes a additional unnecessary deletion (negative value for the skyscraper)
the skyscraper requires four boxes; the turbot only three boxes (more negative for the skyscraper)

Thus based on this set of four criterion, the turbot used less resources that the skyscraper and would therefore be declared the winner. Razz Razz

Ted
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Mogulmeister



Joined: 03 May 2007
Posts: 1151

PostPosted: Sun May 02, 2010 10:33 am    Post subject: Reply with quote

I can see cg saying that he finds skyscrapers easier to spot. Wink
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