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Puzzle NR_071

 
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daj95376



Joined: 23 Aug 2008
Posts: 3854
PostPosted: Sat Oct 17, 2009 10:40 pm    Post subject: Puzzle NR_071 Reply with quote
Code:
NR 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


Code:
 +-----------------------+
 | . 8 . | . . 3 | 6 9 . |
 | 9 . . | . . . | . . 1 |
 | . . 2 | 8 . 9 | . . 4 |
 |-------+-------+-------|
 | . . 4 | 5 . 8 | . . 3 |
 | . . . | . 9 . | . 5 . |
 | 5 . 8 | 3 . . | . 6 . |
 |-------+-------+-------|
 | 8 . . | . . . | . . 9 |
 | 2 . . | . 1 7 | . . . |
 | . 4 1 | 9 . . | 3 . 6 |
 +-----------------------+

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: Mon Oct 19, 2009 2:40 pm    Post subject: Reply with quote
Once again, another BBDB.................

Type 1 UR 17 r47c78,
UR 16 r34c12 with strong link 1 in row3 deletes 6 r4c2,
xyz-wing567in r2c2 deletes 5 in r3c2,
ER 7 with hinge in box4 and strong link in col4 deletes 7 in r2c2,
hidden UR 29 in r46c27 and x-wing on 9 deletes 2 in r6c2,
xy-wing 5-67 with vertex 57 in r1c3 deletes 6 in r5c2 AND transport of 6 in pincer at r5c3 to r7c3 also deletes 6 in r3c2,
coloring 6 deletes 6 in r2c5,
xy-wing 16-7 with vertex 16 in r3c1, pincer 17 in r3c2 and pincer 67 is a pseudocell in row4 to delete 7 in r4c2 AND transport of the 7 in r4c8 to r7c7 deletes 7 in r3c7 AND transport 7 in r3c2 to r5c3 deletes another 7 in r5c7,
another xy-wing 1-67 with vertex 17 in r4c7, pincer 16 in r4c1 and pincer 67: (7)r4c8 - (7)r6c9 = (7)r1c9 - (7=5)r1c3 - (5=6)r2c2; r3c1<>6.

Even after all these moves, only singles were involved but it seems to take a lot of work to complete.

Very Tired Ted
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