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Puzzle 10/04/18 (A)

 
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daj95376



Joined: 23 Aug 2008
Posts: 3854
PostPosted: Sun Apr 18, 2010 4:35 pm    Post subject: Puzzle 10/04/18 (A) Reply with quote
Code:
 +-----------------------+
 | . 3 . | . . . | 8 . . |
 | 6 . . | . . . | . . . |
 | . . 9 | . 8 . | 6 . 3 |
 |-------+-------+-------|
 | . . . | . . 6 | 5 . . |
 | . . 5 | . 9 . | 3 . 8 |
 | . . . | 8 . 1 | 2 6 . |
 |-------+-------+-------|
 | 5 . 7 | 4 1 3 | . . 6 |
 | . . . | . . 8 | . 3 . |
 | . . 8 | . 6 . | 7 . 5 |
 +-----------------------+

Play this puzzle online at the Daily Sudoku site
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peterj



Joined: 26 Mar 2010
Posts: 974
Location: London, UK
PostPosted: Sun Apr 18, 2010 5:22 pm    Post subject: Reply with quote
Nice Sunday afternoon puzzle...

Quote:
Multi-colouring(1); r4c2<>1, r8c1<>1
x-wing(4) - eliminating 4 from 6 cells
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tlanglet



Joined: 17 Oct 2007
Posts: 2468
Location: Northern California Foothills
PostPosted: Mon Apr 19, 2010 12:05 am    Post subject: Reply with quote
My initial solution was similar to the one already posted by Peterj, so I tried another pass using different techniques.

Sashimi swordfish 4 in r359c168; r8c1<>4
ALS179[((9)r46c2 = (1)r4c2]r46c2 - r4c89 = r5c8 - r9c8 = r8c7 - (1=9)r8c1; r8c2<>9.
Interesting ALS124[(14)r2c37 = (2)r2c3]r2c37 - (2=1)r4c3 - r4c89 = (1)r5c8 R2c8<>1.
But now the chain can be continued: (1)r5c8 - (1=4)r9c8 - r8c7 = (4)r2c7; r2c5689<>4.
Type 1 UR 79 in r46c29; r4c9<>79,

At this point I did not easily find further steps so I simply used the last step of the original post, which seemed to be required to solve the puzzle.

Ted
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Marty R.



Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
PostPosted: Mon Apr 19, 2010 4:54 am    Post subject: Reply with quote
Very similar to Peter, except it was a simple Skyscraper on 1 which led to a puzzle-ending X-Wing on 4.
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