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July 24 DB

 
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Auburnmom



Joined: 13 Mar 2008
Posts: 25
Location: Auburn, AL
PostPosted: Sat Jul 24, 2010 3:08 pm    Post subject: July 24 DB Reply with quote
Must be easier than last weeks. I got it!

| 8 . . | . . . | 7 9 . |
| 6 . . | 4 . 8 | . 3 . |
| . 7 2 | 5 . . | . . . |
+-------+-------+-------+
| 5 . 9 | 2 1 . | . . . |
| . . . | . . . | . . . |
| . . . | . 8 3 | 2 . 9 |
+-------+-------+-------+
| . . . | . . 7 | 9 6 . |
| . 8 . | 9 . 2 | . . 1 |
| . 6 7 | . . . | . . 3 |
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Marty R.



Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
PostPosted: Sat Jul 24, 2010 6:39 pm    Post subject: Reply with quote
Code:

+-------+-------+-------+
| 8 . . | . . . | 7 9 . |
| 6 . . | 4 . 8 | . 3 . |
| . 7 2 | 5 . . | . . . |
+-------+-------+-------+
| 5 . 9 | 2 1 . | . . . |
| . . . | . . . | . . . |
| . . . | . 8 3 | 2 . 9 |
+-------+-------+-------+
| . . . | . . 7 | 9 6 . |
| . 8 . | 9 . 2 | . . 1 |
| . 6 7 | . . . | . . 3 |
+-------+-------+-------+

Play this puzzle online at the Daily Sudoku site
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storm_norm



Joined: 18 Oct 2007
Posts: 1741
PostPosted: Sun Jul 25, 2010 12:18 am    Post subject: Reply with quote
Quote:
I believe this puzzle is solved by two VH steps. x-wing then xy-wing.
but ignoring the conventional route i get this.


but if you skip to the xy-wing and look for outs, I come up with this.


Code:
+------------------+--------------+---------------+
| 8     145  1345  | 13  2    16  | 7     9  6(5) |
| 6     9    5-1   | 4   7    8   | (15)  3  2    |
| (13)  7    2     | 5   39   169 | 18    4  68   |
+------------------+--------------+---------------+
| 5     3    9     | 2   1    4   | 6     8  7    |
| 7     2    8     | 6   59   59  | 3     1  4    |
| 14    14   6     | 7   8    3   | 2     5  9    |
+------------------+--------------+---------------+
| 2     145  (145) | 38  345  7   | 9     6  8(5) |
| (34)  8    345   | 9   6    2   | 45    7  1    |
| 9     6    7     | 18  45   15  | 458   2  3    |
+------------------+--------------+---------------+


if the xy-wing {1,3,4} r3c1, r8c1, r7c3... is false, then the 5 in r7c3 is true... (5)r7c3 - (5)r7c9 = (5)r1c9 - (5=1)r2c7

or if the xy-wing is true then the 1 in r2c3 is eliminated.
either way, the 1 in r2c3 is toast.

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