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Puzzle NR_059

 
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daj95376



Joined: 23 Aug 2008
Posts: 3854
PostPosted: Wed Jul 15, 2009 4:25 am    Post subject: Puzzle NR_059 Reply with quote
XYZ-Wing alert

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

Play this puzzle online at the Daily Sudoku site
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arkietech



Joined: 31 Jul 2008
Posts: 1834
Location: Northwest Arkansas USA
PostPosted: Wed Jul 15, 2009 12:58 pm    Post subject: Reply with quote
Two Steps:
Quote:
w-wing 35
w-wing 39
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storm_norm



Joined: 18 Oct 2007
Posts: 1741
PostPosted: Wed Jul 15, 2009 5:05 pm    Post subject: Reply with quote
Code:
.------------------.------------------.------------------.
| 2     6     4    | 35    1     7    | 8     9     35   |
| 5     1    W39   | 239   8     23   | 67    67    4    |
| 8    W39    7    | 3459  6     45   | 1     2     35   |
:------------------+------------------+------------------:
| 379   3579  2359 | 1     4     236  | 2356  356   8    |
| 1     4     23   | 8     5     236  | 9     36    7    |
| 6    W35    8    | 7     23    9    | 235   4     1    |
:------------------+------------------+------------------:
| 39   23-59  1    | 2345  7     45   | 35    8     6    |
| 37   23-57  6    | 235   23    8    | 4     1     9    |
| 4     8    W35   | 6     9     1    | 357   357   2    |
'------------------'------------------'------------------'

the marked w-wing {3,5} strong link on 3's is a one stepper, removes the 5's in r78c2
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tlanglet



Joined: 17 Oct 2007
Posts: 2468
Location: Northern California Foothills
PostPosted: Wed Jul 15, 2009 8:56 pm    Post subject: Reply with quote
I used a xy-chain I found while trying to extend an xy-wing plus a xy-wing which then made the same eliminations as Norm's w-wing 35.

(9=3)r7c1 - (3=5)r9c3 - (5)r9c78 = (5)r7c7 - (5)r7c6 = (5)r3c6 - (5=3)r3c9 - (3=9)r3c2; r7c2<>9,
xy-wing 37-5 with pivot 37 in r4c1 and pseudo-cell 57 in box7 deletes 5 in r78c2.

Ted
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