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Puzzle NR_073

 
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daj95376



Joined: 23 Aug 2008
Posts: 3854
PostPosted: Tue Oct 20, 2009 9:16 pm    Post subject: Puzzle NR_073 Reply with quote
Not bad, except for the XYZ-Wing.

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

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 26, 2009 2:35 pm    Post subject: Re: Puzzle NR_073 Reply with quote
daj95376 wrote:
Not bad, except for the XYZ-Wing.


That was easy for you to say Danny, but I struggled before and after finding the xyz-wing; another BBDBer.

xy-wing 1-37 with vertex in r5c7,
a useless staircase skyscraper 3 in r69c4 provided a deletion after transporting a pincer,
a grouped kite on 7 in box4,
skyscraper 7 in r5c37,
another skyscraper 7 in r38c5,
xyz-wing 137 in r9c4,
a useless xy-wing -127 with vertex in r2c5 and pincer transport,
coloring 7,
and finally another coloring on 7.

Ted
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daj95376



Joined: 23 Aug 2008
Posts: 3854
PostPosted: Mon Oct 26, 2009 6:51 pm    Post subject: Re: Puzzle NR_073 Reply with quote
tlanglet wrote:
daj95376 wrote:
Not bad, except for the XYZ-Wing.


That was easy for you to say Danny, but I struggled before and after finding the xyz-wing; another BBDBer.

Yes ... because I didn't check to see how difficult it was to manually spot the Skyscraper and 2-String Kites. Your solution essentially matches my solver's.

Code:
 r6  b4  Locked Candidate 1              <> 2    [r6c45]
   c8b3  Locked Candidate 1              <> 4    [r689c8]
 r8  b9  Locked Candidate 1              <> 5    [r8c456]

 c37r5   Skyscraper                      <> 7    [r7c2],[r9c89]
 r7c9    2-String Kite                   <> 7    [r3c5]

 r8  b7  Locked Candidate 1              <> 1    [r8c4568]

         XYZ-Wing r9c5/r7c5+r9c8         <> 1    [r9c4]

 r9      Naked  Pair                     <> 37   [r9c5]
   c5b8  Locked Candidate 1              <> 1    [r46c5]
   c4b8  Locked Candidate 1              <> 3    [r5c4]

 r9c2    2-String Kite                   <> 7    [r1c4]   -or-
 r19\c24 Sashimi X-Wing                  <> 7    [r8c2]

You're probably going to find NR_075 rough going as well. However, there are solutions posted for NR_074 that are easier than the one found by my solver, so I can't guarantee that NR_075 will be rough.

I'm considering generating new puzzles that don't have as many steps. So, you may find future puzzles less difficult but, hopefully, still fun.

Regards, Danny
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tlanglet



Joined: 17 Oct 2007
Posts: 2468
Location: Northern California Foothills
PostPosted: Tue Oct 27, 2009 12:33 am    Post subject: Re: Puzzle NR_073 Reply with quote
daj95376 wrote:


I'm considering generating new puzzles that don't have as many steps. So, you may find future puzzles less difficult but, hopefully, still fun.

Regards, Danny


Danny, please do not misunderstand my comments regarding puzzles that require lots of steps; I enjoy them very much Exclamation

True, I would not want a steady diet of them, but I like the "thrill" of wondering if the next step will complete the puzzle. This is especially true if I have no preconceived idea if the puzzle is a BBDB or a one- stepper. In either case, I enjoy looking for the unusual move; all of your puzzles offer a good, rewarding challenge. I look forward to each and every one.

Ted
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Marty R.



Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
PostPosted: Tue Oct 27, 2009 3:55 am    Post subject: Reply with quote
Quote:
You're probably going to find NR_075 rough going as well.

I used a bunch of moves; as usual, I don't know if they all were needed.
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