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Puzzle 10/09/01: C

 
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daj95376



Joined: 23 Aug 2008
Posts: 3854
PostPosted: Wed Sep 01, 2010 4:30 am    Post subject: Puzzle 10/09/01: C Reply with quote
Code:
 +-----------------------+
 | 7 . . | . . . | 8 . 4 |
 | . . . | . . . | . 1 . |
 | 6 . 2 | . . 7 | . . . |
 |-------+-------+-------|
 | . . . | 4 . . | . 3 . |
 | . . . | . 3 . | . . 6 |
 | . . 3 | . . 2 | . . 9 |
 |-------+-------+-------|
 | 2 . 6 | . . . | . 5 . |
 | . 1 . | 5 . 3 | . 6 . |
 | . 4 5 | . 6 8 | . . . |
 +-----------------------+

Play this puzzle online at the Daily Sudoku site
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JC Van Hay



Joined: 13 Jun 2010
Posts: 494
Location: Charleroi, Belgium
PostPosted: Wed Sep 01, 2010 11:10 am    Post subject: Reply with quote
Quote:
4-SIS AIC : 5R1 (57)R6C2 7R7 9B8 : (5)r1c5=(9)r8c5 : => r1c5<>9
X Wing (7)R48/c35 : => r56c35<>7

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peterj



Joined: 26 Mar 2010
Posts: 974
Location: London, UK
PostPosted: Wed Sep 01, 2010 12:49 pm    Post subject: Reply with quote
Sort of a w-wing with a xy chain replacing the bivalue strong link on one end...
Quote:
w-wing(79) with xy chain (9=7)r5c4 - r4c5=r4c3 - (7=5)r6c2-(5=9)r1c2-(9=5)r1c5-(5=9)r2c6 ; r45c6<>9


JC, I think this makes basically the same elimination as your m-wing-like move - so perhaps you don't need the x-wing?
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JC Van Hay



Joined: 13 Jun 2010
Posts: 494
Location: Charleroi, Belgium
PostPosted: Wed Sep 01, 2010 1:13 pm    Post subject: Reply with quote
Peter, you are right. I missed the NP(15) Embarassed even though I played with it in a 7-SIS continuous nice loop starting from (5)r2c6. I didn't check the grid, I only looked at the available exclusions I had. Thanks for the comment.
JC
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tlanglet



Joined: 17 Oct 2007
Posts: 2468
Location: Northern California Foothills
PostPosted: Wed Sep 01, 2010 11:04 pm    Post subject: Reply with quote
I tried to find xy-chains since they are difficult for me; I need the experience. I used the "storm_norm" technique: start in the middle and work both ends.

Quote:
(9=5)r2c6-r1c5=r1c2-(5=7)r6c2-r6c7=r5c7-(7=9)r5c4; r45c6<>9

Ted
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Marty R.



Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
PostPosted: Thu Sep 02, 2010 9:49 pm    Post subject: Reply with quote
I played two ERs (9,7) which I don't know if were needed because later I found a hidden single that I missed. Regardless, from that point, an XY-Chain (r1c2<>5) did the trick.
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