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Oct 16 VH

 
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hughwill



Joined: 05 Apr 2010
Posts: 424
Location: Birmingham UK
PostPosted: Wed Oct 16, 2013 8:30 am    Post subject: Oct 16 VH Reply with quote
After basics:
Code:

+--------------+-------------+--------------+
| 127  8   257 | 17  9   6   | 3   257  4   |
| 1247 9   257 | 3   248 158 | 256 2567 126 |
| 3    457 6   | 147 24  15  | 9   8    12  |
+--------------+-------------+--------------+
| 78   567 4   | 9   68  2   | 1   56   3   |
| 9    356 235 | 14  7   13  | 256 2456 8   |
| 28   36  1   | 5   468 38  | 7   246  9   |
+--------------+-------------+--------------+
| 6    2   9   | 8   1   7   | 4   3    5   |
| 47   347 378 | 2   5   9   | 68  1    67  |
| 5    1   78  | 6   3   4   | 28  9    27  |
+--------------+-------------+--------------+

Play this puzzle online at the Daily Sudoku site
The usual answer- a
Quote:
368 XY wing pivot r6c6 removing the 6 in r6c5

solves the puzzle
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TerenceF



Joined: 21 Dec 2007
Posts: 26
Location: Takapuna, NZ
PostPosted: Wed Oct 16, 2013 9:52 am    Post subject: Reply with quote
Fastest puzzle in a while?

The XY wing identified by Hugh is revealed after only one basic move from the starting position:
Code:

+----------------+------------------+-----------------+
| 127  8    257  | 127  9     6     | 235  2357  4    |
| 1247 9    257  | 3    12458 14578 | 256  2567  1267 |
| 3    1457 6    | 1247 1245  1457  | 259  8     1279 |
+----------------+------------------+-----------------+
| 678  3567 4    | 89   68    2     | 1    356   369  |
| 9    356  235  | 14   7     134   | 2356 23456 8    |
| 268  36   1    | 5    468   348   | 7    2346  2369 |
+----------------+------------------+-----------------+
| 1678 2    3789 | 178  18    178   | 4    367   5    |
| 4678 3467 378  | 2478 2458  9     | 2368 1     2367 |
| 5    147  78   | 6    3     1478  | 28   9     27   |
+----------------+------------------+-----------------+

The 178 triple in r7 box 8 forces r9c6 = 4, hence r6c6 = 38, revealing the wing that solves the puzzle
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