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Puzzle 11/02/11 Extreme

 
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daj95376



Joined: 23 Aug 2008
Posts: 3854
PostPosted: Fri Feb 11, 2011 6:17 pm    Post subject: Puzzle 11/02/11 Extreme Reply with quote
Code:
 +-----------------------+
 | . 5 . | 2 . 1 | 7 . 9 |
 | 1 2 . | . . . | . 6 5 |
 | . . . | . 9 6 | . . . |
 |-------+-------+-------|
 | 2 . . | . . 8 | 5 . 6 |
 | . . 5 | . 6 3 | . . . |
 | 8 . 6 | 9 5 2 | . 7 1 |
 |-------+-------+-------|
 | 9 . . | 6 . . | . 1 . |
 | . 7 . | . . 9 | 6 . . |
 | 5 6 . | 1 . 7 | . . 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: Fri Feb 11, 2011 9:44 pm    Post subject: Reply with quote
Initially got bogged down in turbot moves - this was faster...
Quote:
w-wing(34) r6c2, r8c2, (3)r6c7=r2c7-r2c4=r8c4 ; r5c1<>4, r7c2<>4
x-wing(4) r1, r4
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daj95376



Joined: 23 Aug 2008
Posts: 3854
PostPosted: Sat Feb 12, 2011 1:52 am    Post subject: Reply with quote
Peter: I believe this 4-SIS W-Wing is your first move. Nice catch!

(4=3)r6c2 - r6c7 = r2c7 - r2c4 = r8c4 - (3=4)r8c1 => r5c1,r7c2<>4





BTW: Thanks to whomever reorganized the ordering of the forum sections!
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Marty R.



Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
PostPosted: Sat Feb 12, 2011 4:30 pm    Post subject: Reply with quote
I had some sort of chain, maybe an AIC; r5c1<>4. Then a W-Wing (34); r3c8<>3 + transport; r3c2<>3.
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