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Puzzle NR_029

 
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daj95376



Joined: 23 Aug 2008
Posts: 3854
PostPosted: Tue May 26, 2009 3:53 pm    Post subject: Puzzle NR_029 Reply with quote
Code:
 +-----------------------+
 | . 1 7 | . 2 6 | . 4 8 |
 | 9 . . | 4 . 1 | 5 . . |
 | 4 . 2 | . . 5 | . 9 . |
 |-------+-------+-------|
 | . 7 . | 1 . . | . . . |
 | 6 . . | . . 8 | . . 1 |
 | 1 2 5 | . 4 7 | . . . |
 |-------+-------+-------|
 | . 4 . | . . . | 8 . . |
 | 8 . 9 | . . . | . . . |
 | 7 . . | . 8 . | . . 5 |
 +-----------------------+

Play this puzzle online at the Daily Sudoku site
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storm_norm



Joined: 18 Oct 2007
Posts: 1741
PostPosted: Wed May 27, 2009 7:08 am    Post subject: Reply with quote
filter out the VH moves
one x-wing and one xy-wing leads to this grid.
Code:
.---------------.---------------.---------------.
| 5    1    7   | 9    2    6   | 3    4    8   |
| 9    8    36  | 4    37   1   | 5    67   2   |
| 4    36   2   | 8    37   5   | 1    9    67  |
:---------------+---------------+---------------:
| 3    7    8   | 1    69   29  | 26   5    4   |
| 6    9    4   |*23   5    8   | 7   *23   1   |
| 1    2    5   | 36   4    7   | 69   8    39  |
:---------------+---------------+---------------:
| 2    4    16  | 5    169  3   | 8    167  679 |
| 8    5    9   | 7   *16   24  | 24  -136* 36  |
| 7    36   136 |*26   8    49  | 49   126  5   |
'---------------'---------------'---------------'

(1=6)r8c5 - (6=2)r9c4 - (2)r5c4 = (2-3)r5c8 = (3)r8c8; r8c8 <> 1

then xy-wing to finish it.
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Marty R.



Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
PostPosted: Sat May 30, 2009 4:32 pm    Post subject: Reply with quote
I used an XY-Wing and a Mixed W-Wing. On the grid shown, based on the 2s in c4, r5c8 must be 3 or r9c4 must be 6. If r5c8 is 3, then r4c5 must be 6 and the elimination of the 6s in boxes 58 finishes the puzzle.
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