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Puzzle VH 09/11/07

 
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daj95376



Joined: 23 Aug 2008
Posts: 3854
PostPosted: Sat Nov 07, 2009 8:19 pm    Post subject: Puzzle VH 09/11/07 Reply with quote
Anyone interested in a VH puzzle?

Code:
VH 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

Code:
 +-----------------------+
 | . . 7 | . . 6 | 9 . . |
 | . 4 2 | 9 . 1 | . 5 . |
 | 9 8 . | . . 2 | . 1 4 |
 |-------+-------+-------|
 | . 5 . | 2 . . | . . . |
 | . . . | . . . | . 9 . |
 | 6 7 9 | . . 8 | . . . |
 |-------+-------+-------|
 | 8 . . | . . . | 6 . . |
 | . 6 1 | . 8 . | . 2 5 |
 | . . 5 | . . . | . 8 9 |
 +-----------------------+

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: Sun Nov 08, 2009 8:46 am    Post subject: Reply with quote
Another one?
Quote:
ur 35 => r6c9<>1 (it's not a type 1)
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storm_norm



Joined: 18 Oct 2007
Posts: 1741
PostPosted: Sun Nov 08, 2009 6:05 pm    Post subject: Reply with quote
again, another way to avoid the UR 35 is to see that in rows 3 and 6, there are only 5 places that the UR candidates exist. the UR cells themselves, and r6c9. if r6c9 wasn't a 3, this would force the UR to exist in r36c45 and this is a NO NO. therefore r6c9 has to be a 3.
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