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Puzzle 10/10/31: A8 BBDB Advanced -- Difficult!

 
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daj95376



Joined: 23 Aug 2008
Posts: 3854
PostPosted: Sat Oct 30, 2010 5:28 pm    Post subject: Puzzle 10/10/31: A8 BBDB Advanced -- Difficult! Reply with quote
I'm hanging up my hat on posting puzzles. Today's puzzles are the last.

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

Play this puzzle online at the Daily Sudoku site
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peterj



Joined: 26 Mar 2010
Posts: 974
Location: London, UK
PostPosted: Mon Nov 01, 2010 6:05 pm    Post subject: Reply with quote
Four steps - two xyz's...
Quote:
skyscraper(5) c2, c5 ; r8c3<>5, r9c46<>5
xyz-wing(58-9) r1c6 ; r1c4<>9
xyz-wing(37-6) r4c6 ; r4c5<>6
xy-wing(59-3) r5c4 or BUG+2[(3)r4c9=(3)r6c3] ; r4c3<>3
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Marty R.



Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
PostPosted: Mon Nov 01, 2010 7:56 pm    Post subject: Reply with quote
ER (5); r8c3<>5
ER (9); r7c6<>9
DP 35-56-36 in boxes 456; r6c3<>8 due to invalidity
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