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Puzzle 11/01/31 Hard BBDB

 
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daj95376



Joined: 23 Aug 2008
Posts: 3854
PostPosted: Tue Feb 01, 2011 12:21 am    Post subject: Puzzle 11/01/31 Hard BBDB Reply with quote
Code:
 +-----------------------+
 | 5 . . | . . 8 | . . 9 |
 | . 8 . | 9 6 . | . 5 . |
 | . . 6 | 7 . . | . . 3 |
 |-------+-------+-------|
 | . 9 7 | . . . | 1 . . |
 | . 6 . | . 9 . | . 3 7 |
 | 2 . . | . . 7 | 9 . 6 |
 |-------+-------+-------|
 | . . . | 5 . 6 | 7 . . |
 | . 7 . | . 8 . | . 9 . |
 | 8 . 4 | . 7 9 | . . 2 |
 +-----------------------+

Play this puzzle online at the Daily Sudoku site
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peterj



Joined: 26 Mar 2010
Posts: 974
Location: London, UK
PostPosted: Tue Feb 01, 2011 10:11 am    Post subject: Reply with quote
Four steps nicely leading on to each other - nice puzzle, Danny...
Quote:
xyz-wing(48-1) r7c9 ; r8c9<>1
xy-wing(45-1) r8c9 ; r2c3<>1
sashimi x-wing(1) c3, c6 ; r1c45<>1
skyscraper(5) r5, r9 ; r8c3<>5, r6c2<>5
With hindsight, after the first wing this "almost" move was available...
Quote:
almost skyscraper(5) r5, r9 fin (5)r5c6 ; r6c2<>5
skyscraper(5)r5,r9[(5)r5c3=r9c2]=(5)r5c6 - (4)r5c6=r5c3 - r1c4=(4-3)r1c2=r6c2
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Marty R.



Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
PostPosted: Wed Feb 02, 2011 12:09 am    Post subject: Reply with quote
I never thought I would solve this, but chipping away and eight moves later it fell.
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