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Free Press Feb 5, 2010

 
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keith



Joined: 19 Sep 2005
Posts: 3355
Location: near Detroit, Michigan, USA
PostPosted: Sat Feb 06, 2010 10:03 pm    Post subject: Free Press Feb 5, 2010 Reply with quote
Just like one of the daily Very Hard puzzles:
Code:
Puzzle: FP020510
+-------+-------+-------+
| . 3 . | . . 6 | . 8 . |
| . . . | . . . | 9 . . |
| 7 . . | . 2 . | . . . |
+-------+-------+-------+
| 2 . 1 | . 7 . | 5 . . |
| . . 7 | . . . | 6 . . |
| . . 5 | . 6 . | 8 . 1 |
+-------+-------+-------+
| . . . | 7 4 . | . . 9 |
| . . 8 | . . . | 2 . . |
| . 7 . | 5 . . | . 3 . |
+-------+-------+-------+

Keith
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tlanglet



Joined: 17 Oct 2007
Posts: 2468
Location: Northern California Foothills
PostPosted: Sun Feb 07, 2010 2:51 pm    Post subject: Reply with quote
A nice, but useless, 6-cell DP on 49 in r4c68, r5c28, r6c26. To prevent the deadly pattern:
(3)r4c6 - (3=4)r4c9 - (4=9)r4c8,
(2)r5c8 - (2=34)r45c9 - (4=9)r4c8.
Thus both conditions that prevent the deadly pattern force r4c8=9.

A one-step VH solution is
Quote:
xy-wing -159 with vertex in r1c5.

Ted
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