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Set XY_03 Puzzle 051

 
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daj95376



Joined: 23 Aug 2008
Posts: 3854
PostPosted: Wed Nov 04, 2009 4:54 pm    Post subject: Set XY_03 Puzzle 051 Reply with quote
Code:
XY puzzles can be solved using these techniques:

Basics:  Naked/Hidden Single, Naked Pair/Triple, Locked Candidates 1/2
Basics+: Naked Quad, Hidden Pair/Triple/Quad
VH:      BUG+1, UR Type 1, X-Wing, XY-Wing
VH+:     2-String Kite, Empty Rectangle, Remote Pair, Skyscraper,
         XYZ-Wing, finned X-Wing, UR Type 2/4
XY:      gM-Wing, W-Wing, XY-Chain, BUG+2, BUG+3, other URs


Code:
 +-----------------------+
 | . 1 . | . 4 9 | 8 . . |
 | 2 . 8 | . . . | 6 9 . |
 | . 9 4 | 8 . . | 7 1 . |
 |-------+-------+-------|
 | . . 2 | 4 . . | . . 6 |
 | 7 . . | . . 3 | 1 . . |
 | 1 . . | . 6 . | . . . |
 |-------+-------+-------|
 | 8 3 1 | . 7 . | . . . |
 | . 6 7 | . . . | . 8 . |
 | . . . | 6 . . | . . 1 |
 +-----------------------+

Play this puzzle online at the Daily Sudoku site
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arkietech



Joined: 31 Jul 2008
Posts: 1834
Location: Northwest Arkansas USA
PostPosted: Wed Nov 04, 2009 6:36 pm    Post subject: Reply with quote
I used:
Quote:
w-wing 53
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Marty R.



Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
PostPosted: Thu Nov 05, 2009 6:02 am    Post subject: Reply with quote
I missed Dan's move and solved it by trial and error, I guess. I started an XY-Chain and it led to an invalidity and that solved it.
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tlanglet



Joined: 17 Oct 2007
Posts: 2468
Location: Northern California Foothills
PostPosted: Thu Nov 05, 2009 3:33 pm    Post subject: Reply with quote
I was looking for xy-wings and found a chain by extending the possible vertex.

(2=5)r1c8 - (5=3)r3c9 - (3)r3c1 = (3)r4c1 - (3=9)r6c3 - (9=2)r6c7; r56c8<>2

Ted
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