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Sep 10 VH

 
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Clement



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

PostPosted: Tue Sep 09, 2014 9:57 pm    Post subject: Sep 10 VH Reply with quote

Code:

+-------------+-----------+--------------+
| 4   9   3   | 2   6   1 | 5    7   8   |
| 7   8   #26  | 9   5   4 | 236  236 1   |
| 56  *25  1   | 8   7   3 | 2469 26  469 |
+-------------+-----------+--------------+
| 2   7   4   | 1   39  5 | 369  8   369 |
| 35  6   59  | 7   8   2 | 349  1   349 |
| 38  1   89  | 34  349 6 | 7    5   2   |
+-------------+-----------+--------------+
| 368 234 268 | 5   34  9 | 1    236 7   |
| 1   34-5 *56  | 346 2   7 | 8    9   356 |
| 9   23-5 7   | 36  1   8 | 236  4   356 |
+-------------+-----------+--------------+
XY-Wing 26-5 pivoted in r2c3; r89c2<>5; stte.
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hughwill



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

PostPosted: Wed Sep 10, 2014 9:48 am    Post subject: Sep 10 VH Reply with quote

After basics:

Code:

+------------+-----------+-------------+
| 4  9   3   | 2   6   1 | 5   7   8   |
| 7  8   26  | 9   5   4 | 236 236 1   |
| 56 25  1   | 8   7   3 | 49  26  49  |
+------------+-----------+-------------+
| 2  7   4   | 1   39  5 | 369 8   369 |
| 35 6   59  | 7   8   2 | 349 1   349 |
| 38 1   89  | 34  349 6 | 7   5   2   |
+------------+-----------+-------------+
| 68 234 268 | 5   34  9 | 1   236 7   |
| 1  345 56  | 346 2   7 | 8   9   356 |
| 9  235 7   | 36  1   8 | 236 4   356 |
+------------+-----------+-------------+

Play this puzzle online at the Daily Sudoku site

Also a 56 w-wing in c13 makes r7c1=8 which (in the end!) sets the puzzle.
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dongrave



Joined: 06 Mar 2014
Posts: 568

PostPosted: Wed Sep 10, 2014 11:41 pm    Post subject: Reply with quote

I had hughwill's starting position after the basics at which point I found the (almost) standard advanced move UR (type 2) of 49's in r35c79 which eliminates the 3 from r5c1 and solves it.
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norwag



Joined: 11 Jan 2011
Posts: 6

PostPosted: Sat Sep 27, 2014 9:51 pm    Post subject: Re: Sep 10 VH Reply with quote

hughwill wrote:
After basics:

Code:

+------------+-----------+-------------+
| 4  9   3   | 2   6   1 | 5   7   8   |
| 7  8   26  | 9   5   4 | 236 236 1   |
| 56 25  1   | 8   7   3 | 49  26  49  |
+------------+-----------+-------------+
| 2  7   4   | 1   39  5 | 369 8   369 |
| 35 6   59  | 7   8   2 | 349 1   349 |
| 38 1   89  | 34  349 6 | 7   5   2   |
+------------+-----------+-------------+
| 68 234 268 | 5   34  9 | 1   236 7   |
| 1  345 56  | 346 2   7 | 8   9   356 |
| 9  235 7   | 36  1   8 | 236 4   356 |
+------------+-----------+-------------+

Play this puzzle online at the Daily Sudoku site

Also a 56 w-wing in c13 makes r7c1=8 which (in the end!) sets the puzzle.


Please say this another way! I get to this point. I don't know what c13 refers to. Nor do I understand r7c1 which to me looks like it is already 1. Rows go down, columns across?? Help...
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norwag



Joined: 11 Jan 2011
Posts: 6

PostPosted: Sat Sep 27, 2014 9:55 pm    Post subject: Re: Sep 10 VH Reply with quote

norwag wrote:
hughwill wrote:
After basics:

Code:

+------------+-----------+-------------+
| 4  9   3   | 2   6   1 | 5   7   8   |
| 7  8   26  | 9   5   4 | 236 236 1   |
| 56 25  1   | 8   7   3 | 49  26  49  |
+------------+-----------+-------------+
| 2  7   4   | 1   39  5 | 369 8   369 |
| 35 6   59  | 7   8   2 | 349 1   349 |
| 38 1   89  | 34  349 6 | 7   5   2   |
+------------+-----------+-------------+
| 68 234 268 | 5   34  9 | 1   236 7   |
| 1  345 56  | 346 2   7 | 8   9   356 |
| 9  235 7   | 36  1   8 | 236 4   356 |
+------------+-----------+-------------+

Play this puzzle online at the Daily Sudoku site

Also a 56 w-wing in c13 makes r7c1=8 which (in the end!) sets the puzzle.


Please say this another way! I get to this point. I don't know what c13 refers to. Nor do I understand r7c1 which to me looks like it is already 1. Rows go down, columns across?? Help...


OK wait. r7c1 is actually sitting at 68. So how do you know it must be 8? Something to do with the 56 w-wing? And c13 is that the 56 in r3c1?
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hughwill



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

PostPosted: Tue Oct 14, 2014 11:02 am    Post subject: Re: Sep 10 VH Reply with quote

norwag wrote:
norwag wrote:
hughwill wrote:
After basics:

Code:

+------------+-----------+-------------+
| 4  9   3   | 2   6   1 | 5   7   8   |
| 7  8   26  | 9   5   4 | 236 236 1   |
| 56 25  1   | 8   7   3 | 49  26  49  |
+------------+-----------+-------------+
| 2  7   4   | 1   39  5 | 369 8   369 |
| 35 6   59  | 7   8   2 | 349 1   349 |
| 38 1   89  | 34  349 6 | 7   5   2   |
+------------+-----------+-------------+
| 68 234 268 | 5   34  9 | 1   236 7   |
| 1  345 56  | 346 2   7 | 8   9   356 |
| 9  235 7   | 36  1   8 | 236 4   356 |
+------------+-----------+-------------+

Play this puzzle online at the Daily Sudoku site

Also a 56 w-wing in c13 makes r7c1=8 which (in the end!) sets the puzzle.


Please say this another way! I get to this point. I don't know what c13 refers to. Nor do I understand r7c1 which to me looks like it is already 1. Rows go down, columns across?? Help...


OK wait. r7c1 is actually sitting at 68. So how do you know it must be 8? Something to do with the 56 w-wing? And c13 is that the 56 in r3c1?


Sorry I didn't see this for so long. The two 56s in the W wing are in columns 1 and 3
(c13). On row 5 there are only two 5s at c1 and c3. If r3c1=5 then r5c1<>5.
That means r5c3 is 5 and r8c3=6. The only other possibility for r3c1 is
that it equals 6. So either possibility means that r7c1<>6 so must =8.
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