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Jun 2 VH

 
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hughwill



Joined: 05 Apr 2010
Posts: 422
Location: Birmingham UK

PostPosted: Thu Jun 02, 2016 9:44 am    Post subject: Jun 2 VH Reply with quote

After basics:
Code:

+------------+------------+---------+
| 68  39  5  | 2   389  4 | 69 7 1  |
| 178 2   89 | 789 1389 6 | 49 5 34 |
| 167 139 4  | 79  139  5 | 2  8 36 |
+------------+------------+---------+
| 5   49  69 | 3   7    1 | 46 2 8  |
| 168 14  68 | 5   2    9 | 7  3 46 |
| 3   7   2  | 6   4    8 | 5  1 9  |
+------------+------------+---------+
| 2   6   1  | 89  89   7 | 3  4 5  |
| 4   5   3  | 1   6    2 | 8  9 7  |
| 9   8   7  | 4   5    3 | 1  6 2  |
+------------+------------+---------+

Play this puzzle online at the Daily Sudoku site

This one's quite neat compared to the frequent bland fare:
There are two XY-Wings that end in the same elimination-
69-3 pivot at r3c9 and 46-9 on r1c7,pivot r4c7,r4c2 both
lead to r1c2=3. Unfortunately this doesn't lead to a stte conclusion.
But what's this?
Quote:
the other 46-9 on r2c7,pivot (again!) r4c7 r4c2 r2c3=8
is a one-stepper.

Two XYs with the same numbers and same pivot- one does it and
the other doesn't. Classic.

Hugh Very Happy
(select the white space under Quote to see the solution)
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Marty R.



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

PostPosted: Thu Jun 02, 2016 12:00 pm    Post subject: Re: Jun 2 VH Reply with quote

hughwill wrote:
After basics:
Code:

+------------+------------+---------+
| 68  39  5  | 2   389  4 | 69 7 1  |
| 178 2   89 | 789 1389 6 | 49 5 34 |
| 167 139 4  | 79  139  5 | 2  8 36 |
+------------+------------+---------+
| 5   49  69 | 3   7    1 | 46 2 8  |
| 168 14  68 | 5   2    9 | 7  3 46 |
| 3   7   2  | 6   4    8 | 5  1 9  |
+------------+------------+---------+
| 2   6   1  | 89  89   7 | 3  4 5  |
| 4   5   3  | 1   6    2 | 8  9 7  |
| 9   8   7  | 4   5    3 | 1  6 2  |
+------------+------------+---------+

Play this puzzle online at the Daily Sudoku site

This one's quite neat compared to the frequent bland fare:
There are two XY-Wings that end in the same elimination-
69-3 pivot at r3c9 and 46-9 on r1c7,pivot r4c7,r4c2 both
lead to r1c2=3. Unfortunately this doesn't lead to a stte conclusion.
But what's this?
Quote:
the other 46-9 on r2c7,pivot (again!) r4c7 r4c2 r2c3=8
is a one-stepper.

Two XYs with the same numbers and same pivot- one does it and
the other doesn't. Classic.

Hugh Very Happy
(select the white space under Quote to see the solution)


Hugh,I have a couple of comments.

Quote:
69-3 pivot at r3c9

There is a 69-3 pivoted in r1c7 and nothing pivoted in r3c9 that I can see.

Quote:
46-9 on r1c7,pivot r4c7,r4c2

What does "onr1c7" mean?

I think if all three cells are mentioned it would be clearer to say 46-9 pivoted at r4c7with pincers at r1c7 and r4c2
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Earl



Joined: 30 May 2007
Posts: 677
Location: Victoria, KS

PostPosted: Thu Jun 02, 2016 1:51 pm    Post subject: June 2 Reply with quote

869 also a one-step solution.

Early Earl
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RobertRattley



Joined: 24 Jun 2007
Posts: 118
Location: Australia

PostPosted: Thu Jun 02, 2016 1:56 pm    Post subject: Reply with quote

I was a bit surprised to see all the discussion since I spotted only 2 xy wings (but then I didn't try hard to find more). One of them I found was neither sufficient nor necessary, and the other, leading to a solution, is the one Earl mentioned:

xy wing 689 pivot r1c1 pincers r1c7 and 2rc3.
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dongrave



Joined: 06 Mar 2014
Posts: 563

PostPosted: Fri Jun 03, 2016 12:05 am    Post subject: Reply with quote

Great puzzle! No wonder there was so much confusion. I found 6 wings (most have already been listed). A couple of them look like they solve it and the others look like they don't.

There's a 68-9 XY Wing with pivot at r1c1 and pincers at r1c7 and r2c3 so r1c2,r2c7<>9; a 69-3 XY Wing with pivot at r1c7 and pincers at r1c2 and r3c9 so r3c2<>3; an 89-6 XY Wing with pivot at r2c3 and pincers at r1c1 and r4c3 so r5c1<>6; a 789 XYZ Wing with pivot at r2c4 and pincers at r2c3 and r4c4 so r2c5<>9; and TWO 46-9 XY Wings with pivot at r4c7 - one with pincers at r1c7 and r4c2 (so r1c2<>9) and the other with pincers at r2c7 and r4c3 (so r2c3<>9). Good one!
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hughwill



Joined: 05 Apr 2010
Posts: 422
Location: Birmingham UK

PostPosted: Fri Jun 03, 2016 11:14 pm    Post subject: Re: Jun 2 VH Reply with quote

Marty R. wrote:


Hugh,I have a couple of comments.

Quote:
69-3 pivot at r3c9

There is a 69-3 pivoted in r1c7 and nothing pivoted in r3c9 that I can see.

Quote:
46-9 on r1c7,pivot r4c7,r4c2

What does "onr1c7" mean?

I think if all three cells are mentioned it would be clearer to say 46-9 pivoted at r4c7with pincers at r1c7 and r4c2


Marty- yes, wrong pivot. Forgot the 'pincers' term - not seen it for some while
and age plays havoc with the memory.
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Marty R.



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

PostPosted: Sat Jun 04, 2016 3:27 pm    Post subject: Reply with quote

Quote:
and age plays havoc with the memory.

Hugh, I'm well (too well, actually) acquainted with the infirmities of age. Crying or Very sad
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