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Puzzle 11/03/03 Difficult

 
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daj95376



Joined: 23 Aug 2008
Posts: 3854
PostPosted: Thu Mar 03, 2011 7:00 pm    Post subject: Puzzle 11/03/03 Difficult Reply with quote
Code:
 +-----------------------+
 | . . . | 7 . 9 | . . . |
 | . 9 . | 5 1 . | . 3 7 |
 | . . 6 | 8 . . | . . 1 |
 |-------+-------+-------|
 | 9 1 5 | 6 . 3 | 7 . 4 |
 | . 3 . | . 8 . | 1 . . |
 | 6 . . | 9 . . | . . 5 |
 |-------+-------+-------|
 | . . . | 3 9 . | . . . |
 | . 7 . | . . . | . 1 . |
 | . 6 9 | 1 . 7 | . . 3 |
 +-----------------------+

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peterj



Joined: 26 Mar 2010
Posts: 974
Location: London, UK
PostPosted: Fri Mar 04, 2011 8:55 am    Post subject: Reply with quote
Three steps focussed on b3...
Quote:
finned x-wing(4) r1, r9 ; r3c8<>4
ant(5=468)r7c769 - (4=2)r7c2 - (2=5)r3c2 ; r3c7<>5
xy-wing(59-4) ; r1c7<>4, r78c7<>4
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Marty R.



Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
PostPosted: Sat Mar 05, 2011 1:21 am    Post subject: Reply with quote
To break up the potential DP on 68 in boxes 89, either r8c9=9 or one of r78c6=4. These possibilities produced numerous common outcomes.
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tlanglet



Joined: 17 Oct 2007
Posts: 2468
Location: Northern California Foothills
PostPosted: Sat Mar 05, 2011 4:20 am    Post subject: Reply with quote
Initially I used the one step AUR(68)r78c69 to complete the puzzle, but then I read the post by Marty so I made a second pass.

AXY-wing(56-8) vertex (56)r1c8, pincers (58)r1c2 & (68)r2c7 with fin (4)r1c8; r2c3<>8
If fin is true: (4)r1c8-(4=5)r9c8-r9c5=r8c5-(5=3)r8c1-(3=4)r8c3-(4=8)r6c3

Ted
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