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Sep 17 VH

 
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Clement



Joined: 24 Apr 2006
Posts: 1113
Location: Dar es Salaam Tanzania
PostPosted: Mon Sep 16, 2013 10:44 pm    Post subject: Sep 17 VH Reply with quote
Code:

+------------+---------+-----------+
| 6  347 47  | 5 1  23 | 78  278 9 |
| 8  9   1   | 7 26 4  | 3   26  5 |
| 2  37  5   | 8 69 39 | 67  4   1 |
+------------+---------+-----------+
| 3  *58  89  | 1 4  7  | 2   *5-9  6 |
| 1  47  479 | 2 5  6  | 79  3   8 |
| 57 6   2   | 9 3  8  | 157 17-5 4 |
+------------+---------+-----------+
| 57 1   78  | 4 29 29 | 568 68-5 3 |
| 9  *58  3   | 6 7  1  | 4   *58  2 |
| 4  2   6   | 3 8  5  | 19  19  7 |
+------------+---------+-----------+
X-Wing on 5 in row 48; r67c8<>5 opens an
XY-Wing 79-17-19 pivoted in r6c8; r4c8<>9, stte.
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arkietech



Joined: 31 Jul 2008
Posts: 1834
Location: Northwest Arkansas USA
PostPosted: Tue Sep 17, 2013 12:35 am    Post subject: Reply with quote
Code:
 
 *--------------------------------------------------*
 | 6    347  47   | 5    1    23   | 78   278  9    |
 | 8    9    1    | 7    26   4    | 3    26   5    |
 | 2    37   5    | 8    69   39   | 67   4    1    |
 |----------------+----------------+----------------|
 | 3    58   89   | 1    4    7    | 2   a59   6    |
 | 1    47   479  | 2    5    6    | 79   3    8    |
 |c57   6    2    | 9    3    8    |17-5 c157  4    |
 |----------------+----------------+----------------|
 | 57   1    78   | 4    29   29   | 568  568  3    |
 | 9    58   3    | 6    7    1    | 4    58   2    |
 | 4    2    6    | 3    8    5    | 19  b19   7    |
 *--------------------------------------------------*
(5=9)r4c8-(9=1)r9c8-(1=75)r6c18 => -5r6c7; ste
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Marty R.



Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
PostPosted: Tue Sep 17, 2013 3:38 am    Post subject: Reply with quote
Same two moves as Clement.

(I edited his post to correct puzzle date).
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hughwill



Joined: 05 Apr 2010
Posts: 424
Location: Birmingham UK
PostPosted: Tue Sep 17, 2013 9:46 am    Post subject: Sep 17 VH Reply with quote
Code:

+------------+---------+-----------+
| 6  347 47  | 5 1  23 | 78  278 9 |
| 8  9   1   | 7 26 4  | 3   26  5 |
| 2  37  5   | 8 69 39 | 67  4   1 |
+------------+---------+-----------+
| 3  58  89  | 1 4  7  | 2   59  6 |
| 1  47  479 | 2 5  6  | 79  3   8 |
| 57 6   2   | 9 3  8  | 157 157 4 |
+------------+---------+-----------+
| 57 1   78  | 4 29 29 | 568 568 3 |
| 9  58  3   | 6 7  1  | 4   58  2 |
| 4  2   6   | 3 8  5  | 19  19  7 |
+------------+---------+-----------+

Play this puzzle online at the Daily Sudoku site

A second X wing on 5 in columns 1 and 7 does the same first step as
Clement and Marty.

BTW I've never quite followed Dan's solutions!
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Marty R.



Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
PostPosted: Tue Sep 17, 2013 12:58 pm    Post subject: Reply with quote
Quote:
BTW I've never quite followed Dan's solutions!


It helps to learn Eureka notation, which I decided to learn a few years too late, but better late than never.

What he's saying is that if r4c8=9, then r6c7=1. If r4c8=5, then r6c7=17. Either way it can't be =5.
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arkietech



Joined: 31 Jul 2008
Posts: 1834
Location: Northwest Arkansas USA
PostPosted: Tue Sep 17, 2013 3:27 pm    Post subject: Re: Sep 17 VH Reply with quote
hughwill wrote:
I've never quite followed Dan's solutions!

Code:


(5=9)r4c8-(9=1)r9c8-(1=75)r6c18 => -5r6c7; ste
  |                    |
  |                    |
if r4c8 is not 5 then           
                        r6c18 is 75

                                Therefore r6c7 cannot be 5

                                            singles to end


Hope this helps
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hughwill



Joined: 05 Apr 2010
Posts: 424
Location: Birmingham UK
PostPosted: Wed Sep 18, 2013 9:16 am    Post subject: Sep 17 VH Reply with quote
arkietech said:

Quote:
Hope this helps



Thanks Dan, it does. Thanks also to Marty.

Does the solution have a name?

Hugh
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arkietech



Joined: 31 Jul 2008
Posts: 1834
Location: Northwest Arkansas USA
PostPosted: Wed Sep 18, 2013 12:11 pm    Post subject: Re: Sep 17 VH Reply with quote
hughwill wrote:
Does the solution have a name?


ALS XY-wing (Almost Locked Set)

remove the 1 from r6c18 and you have a locked set that makes a pincher.
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millan



Joined: 18 Sep 2013
Posts: 1
PostPosted: Wed Sep 18, 2013 12:37 pm    Post subject: solve sudoku Reply with quote
It's not easy to solve sudoku but I want to learn.
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Marty R.



Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
PostPosted: Wed Sep 18, 2013 4:55 pm    Post subject: Re: solve sudoku Reply with quote
millan wrote:
It's not easy to solve sudoku but I want to learn.


Feel free to ask your questions anytime.
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