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Puzzle 10/01/28 (A)

 
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daj95376



Joined: 23 Aug 2008
Posts: 3854
PostPosted: Thu Jan 28, 2010 8:20 pm    Post subject: Puzzle 10/01/28 (A) Reply with quote
Code:
 +-----------------------+
 | 8 4 . | . 6 . | . . . |
 | 5 2 3 | . 9 1 | . . 8 |
 | . 1 9 | 3 . . | . . . |
 |-------+-------+-------|
 | . . 5 | 8 . . | . . . |
 | 9 7 . | . 5 . | . 3 . |
 | . 8 . | . . 7 | . . . |
 |-------+-------+-------|
 | . . . | . . . | 7 5 . |
 | . . . | . 3 . | 1 . 6 |
 | . 5 . | . . . | . 4 9 |
 +-----------------------+

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arkietech



Joined: 31 Jul 2008
Posts: 1834
Location: Northwest Arkansas USA
PostPosted: Thu Jan 28, 2010 9:56 pm    Post subject: Reply with quote
Two steps:
Quote:
xy-wing 426
w-wing 62
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Marty R.



Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
PostPosted: Thu Jan 28, 2010 11:07 pm    Post subject: Reply with quote
Three steps.

XY (246)
Type 4 UR (45)
XY (452) with pincer transport
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tlanglet



Joined: 17 Oct 2007
Posts: 2468
Location: Northern California Foothills
PostPosted: Fri Jan 29, 2010 5:05 pm    Post subject: Reply with quote
I had two steps, both involved following the implications of URs to prevent a deadly pattern.

UR25 r18c46; either r8c46=4 or r8c4=7
(4)r8c46 - (4=2)r8c3 - r56c3 = r4c1 - (2=4)r4c7,
(7)r8c4 - (7=4)r2c4.
These two pincers delete 4 from r2c7.

UR45 r36c79; either r6c7 = 2 or r6c9=1
(2)r6c7 - (2-4)r6c5,
(1)r6c9 - (1=4)r5c9.
These two pincers delete 4 from r5c6 to complete the puzzle.

Ted Very Happy
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