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Oct 25 VH

 
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hughwill



Joined: 05 Apr 2010
Posts: 424
Location: Birmingham UK

PostPosted: Tue Oct 25, 2016 9:29 am    Post subject: Oct 25 VH Reply with quote

After basics:
Code:

+---------------+--------------+-------+
| 46   1    3   | 7    26   24 | 8 9 5 |
| 7    2458 245 | 4589 4589 49 | 3 1 6 |
| 9    58   56  | 3    568  1  | 2 4 7 |
+---------------+--------------+-------+
| 3468 34   46  | 1    28   23 | 5 7 9 |
| 358  35   1   | 89   7    39 | 4 6 2 |
| 2    7    9   | 45   45   6  | 1 3 8 |
+---------------+--------------+-------+
| 34   9    8   | 6    34   5  | 7 2 1 |
| 45   6    245 | 24   1    7  | 9 8 3 |
| 1    23   7   | 29   239  8  | 6 5 4 |
+---------------+--------------+-------+

Play this puzzle online at the Daily Sudoku site
Two Wings for me:
Quote:
46-5 XY-Wing pivot r1c1 then 23-4 XY-Wing pivot r9c2
I guess someone might find a one-step
though the 89-2 XY pivot r5c4 appears to do very little...
Hugh
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JC Van Hay



Joined: 13 Jun 2010
Posts: 494
Location: Charleroi, Belgium

PostPosted: Tue Oct 25, 2016 10:23 am    Post subject: Reply with quote

Code:
+---------------------+----------------+---------+
| (46)   1       3    | 7     26    24 | 8  9  5 |
| 7      258(4)  245  | 4589  4589  49 | 3  1  6 |
| 9      58      5-6  | 3     568   1  | 2  4  7 |
+---------------------+----------------+---------+
| 348-6  3(4)    (46) | 1     28    23 | 5  7  9 |
| 358    35      1    | 89    7     39 | 4  6  2 |
| 2      7       9    | 45    45    6  | 1  3  8 |
+---------------------+----------------+---------+
| 34     9       8    | 6     34    5  | 7  2  1 |
| 45     6       245  | 24    1     7  | 9  8  3 |
| 1      23      7    | 29    239   8  | 6  5  4 |
+---------------------+----------------+---------+
W-Wing{(46)r1c1.r4c3, 4C2} -> -{6r3c3, 6r4c1}; stte
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the_lock_man



Joined: 18 Dec 2012
Posts: 40
Location: Portsmarfff, UK

PostPosted: Tue Oct 25, 2016 11:11 am    Post subject: Re: Oct 25 VH Reply with quote

hughwill wrote:
After basics:
Code:

+---------------+--------------+-------+
| 46   1    3   | 7    26   24 | 8 9 5 |
| 7    2458 245 | 4589 4589 49 | 3 1 6 |
| 9    58   56  | 3    568  1  | 2 4 7 |
+---------------+--------------+-------+
| 3468 34   46  | 1    28   23 | 5 7 9 |
| 358  35   1   | 89   7    39 | 4 6 2 |
| 2    7    9   | 45   45   6  | 1 3 8 |
+---------------+--------------+-------+
| 34   9    8   | 6    34   5  | 7 2 1 |
| 45   6    245 | 24   1    7  | 9 8 3 |
| 1    23   7   | 29   239  8  | 6 5 4 |
+---------------+--------------+-------+

the 89-2 XY pivot r5c4 appears to do very little...
Hugh


All that does is remove the 2 from R9C5, which can be done by basics anyway - the 2 in C4 must be in rows 8 or 9, so there can't be a two in R9C5
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richfa



Joined: 14 Feb 2016
Posts: 12

PostPosted: Tue Oct 25, 2016 12:21 pm    Post subject: Notation help Reply with quote

Where can I find help on the notation you are using to describe haow you are solving these puzzles:

Not sure how to read this:
W-Wing{(46)r1c1.r4c3, 4C2} -> -{6r3c3, 6r4c1}; stte

or how to write ways that I have used to solve. If someone can point me to a page, I would be glad to read up on it. Looked in the FAQ, but the notation I saw there doesn't match what's being used in this forum.

Thanks!
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Marty R.



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

PostPosted: Tue Oct 25, 2016 12:52 pm    Post subject: Reply with quote

Quote:
Not sure how to read this:
W-Wing{(46)r1c1.r4c3, 4C2} -> -{6r3c3, 6r4c1}; stte


That's his way of telling us that there's a W-Wing on 46 in r1c1 and r4c3 and they are connected by a strong link on 4 in c2. If r2c2 is 4 then r1c1 must be 6 and if r4c2 is 4 then r4c3 must be 6. Since either r1c1 or r4c3 is 6 then 6 can be eliminated from r3c3 and r4c1. That's not standard notation. It's his way of telling us without using the standard notation.
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Rocky Mozell



Joined: 28 Jul 2010
Posts: 34
Location: Boston, MA

PostPosted: Tue Oct 25, 2016 3:35 pm    Post subject: Reply with quote

All I needed was the 46-5 xy wing. It eliminates 4 from r8c3 making r1c1 6.
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richfa



Joined: 14 Feb 2016
Posts: 12

PostPosted: Wed Oct 26, 2016 7:03 pm    Post subject: Reply with quote

Marty R. wrote:
That's not standard notation. It's his way of telling us without using the standard notation.


Thanks Marty ... OK, I guess what I am asking is where can I learn the standard notation to start out with. I see "stte" at the end of a number of notations and am not sure what a number of other things mean. Is there a reference somewhere? Thanks!
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Clement



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

PostPosted: Wed Oct 26, 2016 9:57 pm    Post subject: Reply with quote

richfa wrote:
Marty R. wrote:
That's not standard notation. It's his way of telling us without using the standard notation.


Thanks Marty ... OK, I guess what I am asking is where can I learn the standard notation to start out with. I see "stte" at the end of a number of notations and am not sure what a number of other things mean. Is there a reference somewhere? Thanks!
The notation we are using in this forum is known as a The Eureka notation. It is a compact method to write Alternating Inference Chains.
You can find the explanation at http://www.sudopedia.org/index.php/Eureka
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richfa



Joined: 14 Feb 2016
Posts: 12

PostPosted: Thu Oct 27, 2016 4:05 pm    Post subject: Reply with quote

Clement wrote:
The notation we are using in this forum is known as a The Eureka notation. It is a compact method to write Alternating Inference Chains.


Thanks Clement!
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richfa



Joined: 14 Feb 2016
Posts: 12

PostPosted: Thu Oct 27, 2016 4:12 pm    Post subject: Reply with quote

Clement wrote:

You can find the explanation at http://www.sudopedia.org/index.php/Eureka


FYI, that link is no longer ... I had to go to a mirror site, located at:
http://sudopedia.enjoysudoku.com/
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