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Mar 5 VH

 
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Clement



Joined: 24 Apr 2006
Posts: 657
Location: Dar es Salaam Tanzania

PostPosted: Tue Mar 04, 2014 10:18 pm    Post subject: Mar 5 VH Reply with quote

Code:

+--------------+--------------+-------------+
| 5    9   27  | 3   1    4   | 26  267  8  |
| 3    8   6   | 9   2    *57  | 1-5  4    17 |
| 1    4   27  | 68  678  578 | 259 2579 3  |
+--------------+--------------+-------------+
| 2469 56  3   | 1   479  #79  | *59  8    26 |
| 29   1   8   | 5   3    6   | 4   79   27 |
| 469  7   459 | 48  489  2   | 3   159  16 |
+--------------+--------------+-------------+
| 7    356 159 | 2   689  389 | 168 136  4  |
| 468  2   14  | 468 5    38  | 7   136  9  |
| 4689 36  49  | 7   4689 1   | 268 236  5  |
+--------------+--------------+-------------+
XY-Wing 79-5 pivoted in r4c6; r2c7<>5; stte.
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hughwill



Joined: 05 Apr 2010
Posts: 167
Location: Birmingham UK

PostPosted: Wed Mar 05, 2014 10:35 am    Post subject: Mar 5 VH Reply with quote

Code:

+--------------+--------------+-------------+
| 5    9   27  | 3   1    4   | 26  267  8  |
| 3    8   6   | 9   2    57  | 15  4    17 |
| 1    4   27  | 68  678  578 | 259 2579 3  |
+--------------+--------------+-------------+
| 2469 56  3   | 1   479  79  | 59  8    26 |
| 29   1   8   | 5   3    6   | 4   79   27 |
| 469  7   459 | 48  489  2   | 3   159  16 |
+--------------+--------------+-------------+
| 7    356 159 | 2   689  389 | 168 136  4  |
| 468  2   14  | 468 5    38  | 7   136  9  |
| 4689 36  49  | 7   4689 1   | 268 236  5  |
+--------------+--------------+-------------+

Play this puzzle online at the Daily Sudoku site

There's a little chain that does the pretty much the same thing:
If r4c6<>7 r4c7=5 r2c7=1 r2c9=7. Either way r2c6<>7 and all the rest fall.

Hugh
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Marty R.



Joined: 12 Feb 2006
Posts: 5123
Location: Rochester, NY, USA

PostPosted: Wed Mar 05, 2014 4:14 pm    Post subject: Re: Mar 5 VH Reply with quote

hughwill wrote:
Code:

+--------------+--------------+-------------+
| 5    9   27  | 3   1    4   | 26  267  8  |
| 3    8   6   | 9   2    57  | 15  4    17 |
| 1    4   27  | 68  678  578 | 259 2579 3  |
+--------------+--------------+-------------+
| 2469 56  3   | 1   479  79  | 59  8    26 |
| 29   1   8   | 5   3    6   | 4   79   27 |
| 469  7   459 | 48  489  2   | 3   159  16 |
+--------------+--------------+-------------+
| 7    356 159 | 2   689  389 | 168 136  4  |
| 468  2   14  | 468 5    38  | 7   136  9  |
| 4689 36  49  | 7   4689 1   | 268 236  5  |
+--------------+--------------+-------------+

Play this puzzle online at the Daily Sudoku site

There's a little chain that does the pretty much the same thing:
If r4c6<>7 r4c7=5 r2c7=1 r2c9=7. Either way r2c6<>7 and all the rest fall.

Hugh


Hugh,that's a classic XY-Chain. If you have any interest in notation it would be expressed as:

(7=9)r4c6-(9=5)r4c7-(5=1)r2c7-(1=7)r2c9=>r2c6<>7
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