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Aug 16 VH

 
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ZeroAssoluto



Joined: 05 Feb 2017
Posts: 941
Location: Rimini, Italy
PostPosted: Tue Aug 15, 2017 10:14 pm    Post subject: Aug 16 VH Reply with quote
Hi everyone,

Code:

+----------+--------------+-----------+
| 489 2 7  | 5    6   48  | 89 3  1   |
| 5   3 89 | 489  1   2   | 7  48 6   |
| 489 6 1  | 4789 3   478 | 5  2  49  |
+----------+--------------+-----------+
| 7   4 28 | 6    28  9   | 3  1  5   |
| 89  1 3  | 48   248 5   | 6  7  29  |
| 6   5 29 | 1    7   3   | 89 48 249 |
+----------+--------------+-----------+
| 2   7 5  | 38   9   1   | 4  6  38  |
| 3   9 6  | 2    48  478 | 1  5  78  |
| 1   8 4  | 37   5   6   | 2  9  37  |
+----------+--------------+-----------+

Play this puzzle online at the Daily Sudoku site

two possible solutions

Quote:
Skyscraper with number 9 in r1c7, r1c1, r5c1, r5c9 and -9 in r3c9 and r6c7
or
W-Wing 8,9 in r2c3, r6c7 connected by number 8 in r26c8 and -9 in r6c3.


Ciao Gianni
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Marty R.



Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
PostPosted: Wed Aug 16, 2017 5:06 am    Post subject: Reply with quote
Code:

+----------+--------------+-----------+
| 489 2 7  | 5    6   48  | 89 3  1   |
| 5   3 89 | 489  1   2   | 7  48 6   |
| 489 6 1  | 4789 3   478 | 5  2  49  |
+----------+--------------+-----------+
| 7   4 28 | 6    28  9   | 3  1  5   |
| 89  1 3  | 48   248 5   | 6  7  29  |
| 6   5 29 | 1    7   3   | 89 48 249 |
+----------+--------------+-----------+
| 2   7 5  | 38   9   1   | 4  6  38  |
| 3   9 6  | 2    48  478 | 1  5  78  |
| 1   8 4  | 37   5   6   | 2  9  37  |
+----------+--------------+-----------+

Play this puzzle online at the Daily Sudoku site

Also Kite on 9 hinged in b6
XY-Wing (48-9), pivot r2c8 with pincer transport
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hughwill



Joined: 05 Apr 2010
Posts: 424
Location: Birmingham UK
PostPosted: Wed Aug 16, 2017 9:09 am    Post subject: Reply with quote
I had XY-wing 48-9 pivot r2c8 -9r3c1 opening 2nd 48-9 XY-wing pivot r3c1
-9 r5c9 stte (sorry if this is the same as yours Marty)

Hugh
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Ajò Dimonios



Joined: 01 May 2017
Posts: 339
Location: Sassari Italy
PostPosted: Wed Aug 16, 2017 10:27 am    Post subject: Reply with quote
Hi everyone

[(2)R6C9-(2)R6C3=(2-8)R4C3=(8)R4C5 and (2-4)R6C9=(4)R6C8-(4)R2C8=(4)R2C4-(4=8)R5C4]=>contradiction two singles 8 in Box 5)=>-2R6C9=>stte.

Ciao a Tutti
Paolo
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Marty R.



Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
PostPosted: Wed Aug 16, 2017 1:30 pm    Post subject: Reply with quote
hughwill wrote:
I had XY-wing 48-9 pivot r2c8 -9r3c1 opening 2nd 48-9 XY-wing pivot r3c1
-9 r5c9 stte (sorry if this is the same as yours Marty)

Hugh


Hugh,

We both used the same 48-9 pivoted in r2c8; I didn't think the elimination would solve the puzzle so I used the transport, which I didn't check but which I assumed solved it.
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dongrave



Joined: 06 Mar 2014
Posts: 568
PostPosted: Wed Aug 16, 2017 10:27 pm    Post subject: Reply with quote
Hey Marty and Hugh, I always use just 'pure' wings when solving VH's on this site (only because I know it's possible) and I couldn't find a solution using just 'pure' wings without using 3 XY Wings! (All 3 of them were 489 XY wings!) Thanks, Don.
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Marty R.



Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
PostPosted: Thu Aug 17, 2017 1:18 am    Post subject: Reply with quote
Don, what are "pure" wings? That's not a term I'm familiar with.
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dongrave



Joined: 06 Mar 2014
Posts: 568
PostPosted: Thu Aug 17, 2017 1:51 am    Post subject: Reply with quote
Hi Marty! A 'pure' wing is a wing that is defined in its basic (or 'purest') form. I didn't look closely at the solution that you provided but I saw that you used the term 'transport' which I assume (maybe wrongly ) is an extension of a 'pure' XY Wing. I've seen you and Keith in past discuss transports and if I'm remembering correctly, I think it added additional logic in order to extend the basic (or pure) Wing. Please correct me if I'm wrong! Thanks, Don.
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Marty R.



Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
PostPosted: Thu Aug 17, 2017 6:46 pm    Post subject: Reply with quote
Don, I don't think using a transport is considered a standards move here.

I would strongly advise familiarizing yourself with and using transports, as it's extremely powerful.

A quick definition: start with pincers, however they became pincers, by any technique. If one of the pincers can prove the same value in another cell, the pincer is said to have been transported to that cell. The transported-to cell can now be used as a pincer in lieu of the transported-from cell. In this puzzle, the pincer 9 can be transported from r2c3 to r5c1. Or the one at r3c9 can be transported to r6c7.
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dongrave



Joined: 06 Mar 2014
Posts: 568
PostPosted: Thu Aug 17, 2017 9:25 pm    Post subject: Reply with quote
Interesting! Thanks for info Marty! I have to check it out! Don.
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RobertRattley



Joined: 24 Jun 2007
Posts: 118
Location: Australia
PostPosted: Sat Aug 19, 2017 7:05 pm    Post subject: Reply with quote
[quote="dongrave"]Hey Marty and Hugh, I always use just 'pure' wings when solving VH's on this site (only because I know it's possible) and I couldn't find a solution using just 'pure' wings without using 3 XY Wings! (All 3 of them were 489 XY wings!) Thanks, Don.[/quote]

I'm with Don. The discussion of so many other techniques lately, though I suppose it's interesting to many, has me a little chagrined.

As for this puzzle, I also found 3 successive 489 XY wings but then realized only 2 of them are needed, as Hughwill listed.
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arkietech



Joined: 31 Jul 2008
Posts: 1834
Location: Northwest Arkansas USA
PostPosted: Sun Aug 20, 2017 12:58 pm    Post subject: Reply with quote
RobertRattley wrote:
dongrave wrote:
Hey Marty and Hugh, I always use just 'pure' wings when solving VH's on this site (only because I know it's possible) and I couldn't find a solution using just 'pure' wings without using 3 XY Wings! (All 3 of them were 489 XY wings!) Thanks, Don.


I'm with Don. The discussion of so many other techniques lately, though I suppose it's interesting to many, has me a little chagrined.

As for this puzzle, I also found 3 successive 489 XY wings but then realized only 2 of them are needed, as Hughwill listed.


Check other puzzles.. I will try to post some VH's you like,

Dan
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