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VH Oct 27
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Mogulmeister



Joined: 03 May 2007
Posts: 963

PostPosted: Wed Oct 27, 2021 8:46 am    Post subject: VH Oct 27 Reply with quote

Code:
+--------------+---------------+--------------+
| 14  13  5    | 34  8    2    | 7   9   6    |
| 9   38  2    | 6   1347 157  | 34  15  58   |
| 48  7   6    | 345 134  9    | 3   125 258  |
+--------------+---------------+--------------+
| 3   6   7    | 2   9    4    | 5   8   1    |
| 5   4   9    | 38  13   18   | 2   6   7    |
| 18  2   18   | 7   5    6    | 9   4   3    |
+--------------+---------------+--------------+
| 2   58  48   | 1   47   57   | 6   3   9    |
| 7   15  14   | 9   6    3    | 8   25  245  |
| 6   9   3    | 458 2    58   | 1   7   45   |
+--------------+---------------+--------------+


After basics.

Quote:
Two XY wings - firstly a <348> eliminating 4 in r3c8 followed by a <134> eliminating 3's in r2c5 and r5c4 .


Last edited by Mogulmeister on Wed Oct 27, 2021 8:54 am; edited 1 time in total
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Mogulmeister



Joined: 03 May 2007
Posts: 963

PostPosted: Wed Oct 27, 2021 8:47 am    Post subject: Reply with quote

A nice challenge for the single step.
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Earl



Joined: 30 May 2007
Posts: 660
Location: Victoria, KS

PostPosted: Wed Oct 27, 2021 11:20 am    Post subject: Oct27 VH Reply with quote

458xyzwing@R7C2, -4R8C2

Early Earl

PS
The above worked the first time, but on retry, I needed two xywings:
348xywing@R3C1, -3R2C7 and 134xywing@R3C3, -3R5C4.
Sorry if I misled anyone. Senior moment!


Last edited by Earl on Wed Oct 27, 2021 1:11 pm; edited 1 time in total
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Mogulmeister



Joined: 03 May 2007
Posts: 963

PostPosted: Wed Oct 27, 2021 12:17 pm    Post subject: Re: Oct27 VH Reply with quote

Earl wrote:
458xyzwing@R7C2, -4R8C2

Early Earl


Did you mean r8c2 Earl ?
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Mogulmeister



Joined: 03 May 2007
Posts: 963

PostPosted: Wed Oct 27, 2021 1:45 pm    Post subject: Re: Oct27 VH Reply with quote

Earl wrote:
458xyzwing@R7C2, -4R8C2

Early Earl

PS
The above worked the first time, but on retry, I needed two xywings:
348xywing@R3C1, -3R2C7 and 134xywing@R3C3, -3R5C4.
Sorry if I misled anyone. Senior moment!


No worries at all! We’ve been on this board a long time and seen a few….some junior moments too!
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immpy



Joined: 06 May 2017
Posts: 470

PostPosted: Wed Oct 27, 2021 5:47 pm    Post subject: Reply with quote

Just looking at Mogulmeister's grid, there was just one oversight. With the 3 already placed in r3c7, this makes r2c7<>3(=4!). And r3c45<>3 as well.
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immpy



Joined: 06 May 2017
Posts: 470

PostPosted: Wed Oct 27, 2021 5:48 pm    Post subject: Reply with quote

Here is a revised after basics grid:

Code:

+----------+-------------+-----------+
| 14 13 5  | 34  8   2   | 7 9   6   |
| 9  38 2  | 6   137 157 | 4 15  58  |
| 48 7  6  | 45  14  9   | 3 125 258 |
+----------+-------------+-----------+
| 3  6  7  | 2   9   4   | 5 8   1   |
| 5  4  9  | 38  13  18  | 2 6   7   |
| 18 2  18 | 7   5   6   | 9 4   3   |
+----------+-------------+-----------+
| 2  58 48 | 1   47  57  | 6 3   9   |
| 7  15 14 | 9   6   3   | 8 25  245 |
| 6  9  3  | 458 2   58  | 1 7   45  |
+----------+-------------+-----------+

Play this puzzle online at the Daily Sudoku site
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immpy



Joined: 06 May 2017
Posts: 470

PostPosted: Wed Oct 27, 2021 5:52 pm    Post subject: Reply with quote

Now the one step solution becomes the XY-Wing: 1/4/3 in r1c4,r35c5=>r2c5,r5c4<>3.

cheers...immp
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Mogulmeister



Joined: 03 May 2007
Posts: 963

PostPosted: Wed Oct 27, 2021 6:21 pm    Post subject: Reply with quote

That's better - thanks Immp! Sorry folks! Posted it slightly undercooked. As you say Immp - no need now for the first XY I suggested.

immpy wrote:
Here is a revised after basics grid:

Code:

+----------+-------------+-----------+
| 14 13 5  | 34  8   2   | 7 9   6   |
| 9  38 2  | 6   137 157 | 4 15  58  |
| 48 7  6  | 45  14  9   | 3 125 258 |
+----------+-------------+-----------+
| 3  6  7  | 2   9   4   | 5 8   1   |
| 5  4  9  | 38  13  18  | 2 6   7   |
| 18 2  18 | 7   5   6   | 9 4   3   |
+----------+-------------+-----------+
| 2  58 48 | 1   47  57  | 6 3   9   |
| 7  15 14 | 9   6   3   | 8 25  245 |
| 6  9  3  | 458 2   58  | 1 7   45  |
+----------+-------------+-----------+

Play this puzzle online at the Daily Sudoku site
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TomC



Joined: 30 Oct 2020
Posts: 143
Location: Wales

PostPosted: Wed Oct 27, 2021 6:51 pm    Post subject: Reply with quote

How is the 3 placed in r3c7 with basics?
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Mogulmeister



Joined: 03 May 2007
Posts: 963

PostPosted: Wed Oct 27, 2021 7:02 pm    Post subject: Reply with quote

Absolutely no idea Tom - how could anyone stuff up basics ? Embarassed Laughing
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Mogulmeister



Joined: 03 May 2007
Posts: 963

PostPosted: Wed Oct 27, 2021 7:04 pm    Post subject: Reply with quote

I should probably retire and leave it to Gianni.
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TomC



Joined: 30 Oct 2020
Posts: 143
Location: Wales

PostPosted: Thu Oct 28, 2021 6:34 am    Post subject: Reply with quote

Mogulmeister, your initial post and solution is perfectly correct, confusion arises from the first grid showing r3c7 as <3> and not <34>
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Mogulmeister



Joined: 03 May 2007
Posts: 963

PostPosted: Thu Oct 28, 2021 7:16 am    Post subject: Reply with quote

Yes - a mispost of the grid. That or fat finger syndrome.
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Mogulmeister



Joined: 03 May 2007
Posts: 963

PostPosted: Thu Oct 28, 2021 7:52 am    Post subject: Reply with quote

...all adds a bit of colour. Perhaps I was subconsciously remembering a post here from 2011:

cgordon wrote:
It's been a while - but out of curiosity I revisted this forum and was interested in the comments about declining interest.

For a few years I was an avid participant of the sudoku forums.
I can recall my banters with other posters such as Nataraj and Asellius where solving problems would lead to discussions on Austrian wine or American beer. There was a social context to the forum.

But then the VH forums seemed to lose sociabilty - to the point where the regular posts now seem to consist of one regular guy revealing an xy wing.
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Mogulmeister



Joined: 03 May 2007
Posts: 963

PostPosted: Thu Oct 28, 2021 8:34 am    Post subject: Reply with quote

Code:

+-------+-------+-------+
| . . 5 | . 8 . | . 9 . |
| . . 2 | 6 . . | . . . |
| . 7 6 | . . 9 | . . . |
+-------+-------+-------+
| 3 6 . | . 9 4 | . 8 . |
| . . . | . . . | . . . |
| . 2 . | 7 5 . | . 4 3 |
+-------+-------+-------+
| . . . | 1 . . | 6 3 . |
| . . . | . . 3 | 8 . . |
| . 9 . | . 2 . | 1 . . |
+-------+-------+-------+
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Mogulmeister



Joined: 03 May 2007
Posts: 963

PostPosted: Thu Oct 28, 2021 8:39 am    Post subject: Reply with quote

Here, I think is what I should have posted with the <34> pair at r23c7 still intact.

Code:

+--------------+---------------+--------------+
| 14  13  5    | 34  8    2    | 7   9   6    |
| 9   38  2    | 6   1347 157  | 34  15  58   |
| 48  7   6    | 345 134  9    | 34  125 258  |
+--------------+---------------+--------------+
| 3   6   7    | 2   9    4    | 5   8   1    |
| 5   4   9    | 38  13   18   | 2   6   7    |
| 18  2   18   | 7   5    6    | 9   4   3    |
+--------------+---------------+--------------+
| 2   58  48   | 1   47   57   | 6   3   9    |
| 7   15  14   | 9   6    3    | 8   25  245  |
| 6   9   3    | 458 2    58   | 1   7   45   |
+--------------+---------------+--------------+


Now the search for the single step can resume ?
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immpy



Joined: 06 May 2017
Posts: 470

PostPosted: Thu Oct 28, 2021 4:18 pm    Post subject: Reply with quote

Ahh, yes. That's what it should look like after basics. And one needs the two XY-Wings to solve using the VH skills.

cheers...immp
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immpy



Joined: 06 May 2017
Posts: 470

PostPosted: Thu Oct 28, 2021 5:51 pm    Post subject: Reply with quote

Would anyone like to discuss beer? I know a little bit about that. LOL

cheers...immp
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TomC



Joined: 30 Oct 2020
Posts: 143
Location: Wales

PostPosted: Thu Oct 28, 2021 6:24 pm    Post subject: Reply with quote

I've found over the years with sudoku that there are many ways to skin a grape

For those that are offended by this phrase I apologise and confirm that I am a great lover of the grape
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