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Puzzle 10/10/27: A VH

 
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daj95376



Joined: 23 Aug 2008
Posts: 3854
PostPosted: Wed Oct 27, 2010 4:05 am    Post subject: Puzzle 10/10/27: A VH Reply with quote
Code:
 +-----------------------+
 | . . 6 | 7 . 2 | 3 5 . |
 | . 5 . | . 3 . | . 8 . |
 | 3 . 7 | . . . | . . . |
 |-------+-------+-------|
 | 4 . . | . 7 5 | . . 8 |
 | . 6 . | 1 4 . | . 7 . |
 | 7 . . | 8 . 3 | . 6 . |
 |-------+-------+-------|
 | 6 . . | . . . | 8 . . |
 | 1 7 . | . 6 8 | . 9 3 |
 | . . . | 3 . . | . 2 7 |
 +-----------------------+

Play this puzzle online at the Daily Sudoku site
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tlanglet



Joined: 17 Oct 2007
Posts: 2468
Location: Northern California Foothills
PostPosted: Wed Oct 27, 2010 7:12 pm    Post subject: Reply with quote
Two possible solutions: a one stepper and a two stepper............

Quote:
xy-wing -149 vertex (49)r6c9; r1c2<>1
xy-wing -148 vertex (48)r1c2; r2c6<>1

or

If simple coloring is a valid VH step to extend a xy-wing pincer:
Flightless xy-wing -149 vertex (49)r9c2 plus simple coloring: (1)r6c2-r4c3=(2)r2c3; r2c6<>1

Both approaches make the same deletion.

Ted
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Marty R.



Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
PostPosted: Wed Oct 27, 2010 9:52 pm    Post subject: Reply with quote
I used Ted's second step, flightless XY-Wing (491); r2c6<>1.
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