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Puzzle 10/08/16: C XY

 
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daj95376



Joined: 23 Aug 2008
Posts: 3854
PostPosted: Mon Aug 16, 2010 5:21 pm    Post subject: Puzzle 10/08/16: C XY Reply with quote
... and used gsf's solver to make a harder puzzle with fewer clues ... (see next puzzle)

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

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 Aug 17, 2010 11:27 am    Post subject: Reply with quote
Hmm.. I felt sure there'd be a nice wing (I've probably missed it), but I ended up with an embarrasingly long xy-chain in this two step..
Quote:
x-wing(7) ; r34c5<>7
xy-chain (3=2)r4c5 - (2=6)r3c3 - (6=7)r3c1 - (7=2)r6c2 - (2=7)r6c8 - (7=8)r1c8 - (8=9)r7c8 - (9=3)r7c1 ; r7c5<>3
I can see there are shortcuts using SL2s.
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