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Puzzle NR_024

 
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daj95376



Joined: 23 Aug 2008
Posts: 3854
PostPosted: Thu May 21, 2009 3:16 pm    Post subject: Puzzle NR_024 Reply with quote
Code:
 +-----------------------+
 | 1 4 7 | . 3 . | . . . |
 | 5 . . | 7 . . | . . . |
 | 2 . 9 | . 4 5 | . 3 7 |
 |-------+-------+-------|
 | . 7 . | . 8 . | . . . |
 | 3 . 1 | 4 6 . | . 7 . |
 | . . 6 | . . . | 5 2 . |
 |-------+-------+-------|
 | . . . | . . 4 | . . . |
 | . . 3 | . 2 7 | . 4 . |
 | . . 4 | . . . | . . 3 |
 +-----------------------+

Play this puzzle online at the Daily Sudoku site

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

Play this puzzle online at the Daily Sudoku site

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Marty R.



Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
PostPosted: Thu May 21, 2009 3:30 pm    Post subject: Reply with quote
Quote:
oaxen version

What does this mean?
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daj95376



Joined: 23 Aug 2008
Posts: 3854
PostPosted: Thu May 21, 2009 5:48 pm    Post subject: Reply with quote
Marty R. wrote:
Quote:
oaxen version

What does this mean?

oaxen requested that I deliver puzzles where the basics had already been solved. After some thought, I decided to add a copy of the puzzle where the initial Naked/Hidden Singles were resolved (for VH and NR puzzles). They bear his name!
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tlanglet



Joined: 17 Oct 2007
Posts: 2468
Location: Northern California Foothills
PostPosted: Fri May 22, 2009 4:53 am    Post subject: Reply with quote
It took me five steps assuming the last move is valid. The first four steps were:
Quote:
Type 2 UR 89 r15c79 deletes 6 from r1c6 & r2c8 plus a strong link 8 in col9 deletes 9 in r1c7,
xy-wing 189 with pivot 89 in r1c6 deletes 1 from r6c4,
kite 9 with hinge in box2 deletes 9 r7c9,
Kraken x-wing on 1 in r27c58 with fin r7c2 deletes 1 r9c8


At this point, I have
Code:

*--------------------------------------------------*
 | 1    4    7    | 2    3    89   | 6    5    89   |
 | 5    3    8    | 7    19   6    | 4    19   2    |
 | 2    6    9    | 18   4    5    | 18   3    7    |
 |----------------+----------------+----------------|
 | 9    7    2    | 5    8    1    | 3    6    4    |
 | 3    5    1    | 4    6    2    | 89   7    89   |
 | 4    8    6    | 9    7    3    | 5    2    1    |
 |----------------+----------------+----------------|
 | 78   129  5    | 3    19   4    | 27   189  6    |
 | 68   19   3    | 68   2    7    | 19   4    5    |
 | 67   12   4    | 16   5    89   | 27   89   3    |
 *--------------------------------------------------*

This is a BUG+2 condition; r7c2=1 or r7c8=9

Following the examples provided by Norm, (I think) a chain can be formed. (Hopefully my notation is understandable if not correct.)
BUG[(1)r7c2 = (9)r7c8] - (9=1)r7c5 - (1)r9c4 =(1)r9c2; r8c2<>1

Comments are appreciated.

Ted Idea
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storm_norm



Joined: 18 Oct 2007
Posts: 1741
PostPosted: Fri May 22, 2009 6:28 am    Post subject: Reply with quote
Ted,
looks correct to me.
but does this mean you missed the coloring move on 9 I have marked below? which removes the 9 in r9c8
Code:
*--------------------------------------------------*
 | 1    4    7    | 2    3   *89   | 6    5   *89   |
 | 5    3    8    | 7    19   6    | 4   *19   2    |
 | 2    6    9    | 18   4    5    | 18   3    7    |
 |----------------+----------------+----------------|
 | 9    7    2    | 5    8    1    | 3    6    4    |
 | 3    5    1    | 4    6    2    | 89   7    89   |
 | 4    8    6    | 9    7    3    | 5    2    1    |
 |----------------+----------------+----------------|
 | 78   129  5    | 3    19   4    | 27   189  6    |
 | 68   19   3    | 68   2    7    | 19   4    5    |
 | 67   12   4    | 16   5   *89   | 27  8-9   3    |
 *--------------------------------------------------*

9... r9c6 = r1c6 - r1c9 = r2c8
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tlanglet



Joined: 17 Oct 2007
Posts: 2468
Location: Northern California Foothills
PostPosted: Fri May 22, 2009 8:34 pm    Post subject: Reply with quote
storm_norm wrote:
Ted,
looks correct to me.
but does this mean you missed the coloring move on 9 I have marked below? which removes the 9 in r9c8

I noticed the possibility of the BUG condition forming while doing cleanup on the initial four moves, so when it happened I immediately looked for the implication of the BUG without considering any other method to complete the puzzle. My interest was totally on determining if I properly understood and utilized the BUG implication.

Ted
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