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April 25 VH

 
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Clement



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

PostPosted: Thu Apr 24, 2014 9:46 pm    Post subject: April 25 VH Reply with quote

Code:

+----------+----------+-------------+
| 7  9  6  | 1  5  3  | 2    4   8  |
| 8  3  2  | 9  4  6  | 1    5   7  |
| 5  4  1  | 8  2  7  | 69   3   69 |
+----------+----------+-------------+
| 1  78 3  | 57 69 2  | 5689 68  4  |
| 4-9 6  5  | 3  8  14 | 7    2   *19 |
| 2  78 49 | 57 69 14 | 5689 68  3  |
+----------+----------+-------------+
| *69 2  89 | 4  7  5  | 3    168 #16 |
| 46 1  48 | 2  3  9  | 68   7   5  |
| 3  5  7  | 6  1  8  | 4    9   2  |
+----------+----------+-------------+
XY-Wing 16-9 pivoted in r7c9; r5c1<>9; stte.
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Marty R.



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

PostPosted: Fri Apr 25, 2014 1:44 am    Post subject: Reply with quote

There's a nice little DP, 78-57-58, in r46,c247. Pseudo cell 69 in r46,c7 combines with 69 in r3c7 to form naked pair=>r8c7<>6. Or r46,c7 can be viewed as a Type 4 since 5 is a strong link, removing the 8s, yielding the same result.
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blindleader



Joined: 11 Jan 2013
Posts: 4

PostPosted: Fri Apr 25, 2014 5:28 pm    Post subject: Reply with quote

There sure can be a world of difference in practical difficulty between two VH puzzles. Getting so close to complete with really easy basics on this one made finding the XY-wing a snap. Most of them take me twice as long as this one did, and I had to give up on the Apr 22 one. Embarassed
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Marty R.



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

PostPosted: Fri Apr 25, 2014 7:13 pm    Post subject: Reply with quote

blindleader wrote:
There sure can be a world of difference in practical difficulty between two VH puzzles. Getting so close to complete with really easy basics on this one made finding the XY-wing a snap. Most of them take me twice as long as this one did, and I had to give up on the Apr 22 one. Embarassed


Did you look at the answer? If not, here's a grid after basics.

Code:

+--------------+-----------------+------------+
| 89 2    689  | 579  59   4     | 567 3   1  |
| 7  1469 3    | 159  1259 569   | 8   245 56 |
| 5  146  146  | 8    123  367   | 467 247 9  |
+--------------+-----------------+------------+
| 1  4789 5    | 2    6    89    | 347 478 37 |
| 3  6789 6789 | 459  4589 589   | 67  1   2  |
| 2  468  468  | 3    7    1     | 9   458 56 |
+--------------+-----------------+------------+
| 6  1379 179  | 1479 1349 2     | 357 57  8  |
| 89 3789 2    | 579  3589 35789 | 1   6   4  |
| 4  5    178  | 6    138  378   | 2   9   37 |
+--------------+-----------------+------------+

Play this puzzle online at the Daily Sudoku site
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