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hughwill
Joined: 05 Apr 2010
Posts: 424
Location: Birmingham UK
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 Posted: Thu Jun 02, 2016 9:44 am Post subject: Jun 2 VH |
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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 |
+------------+------------+---------+
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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 
(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
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| Posted: Thu Jun 02, 2016 12:00 pm Post subject: Re: Jun 2 VH |
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| 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
(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
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| Posted: Thu Jun 02, 2016 1:51 pm Post subject: June 2 |
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869 also a one-step solution.
Early Earl |
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RobertRattley
Joined: 24 Jun 2007
Posts: 118
Location: Australia
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| Posted: Thu Jun 02, 2016 1:56 pm Post subject: |
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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: 568
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| Posted: Fri Jun 03, 2016 12:05 am Post subject: |
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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: 424
Location: Birmingham UK
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| Posted: Fri Jun 03, 2016 11:14 pm Post subject: Re: Jun 2 VH |
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| 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
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| Posted: Sat Jun 04, 2016 3:27 pm Post subject: |
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| Quote: | | and age plays havoc with the memory. |
Hugh, I'm well (too well, actually) acquainted with the infirmities of age.  |
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