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Puzzle 11/05/02: ~ Difficult

 
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daj95376



Joined: 23 Aug 2008
Posts: 3855

PostPosted: Mon May 02, 2011 8:53 pm    Post subject: Puzzle 11/05/02: ~ Difficult Reply with quote

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

Play this puzzle online at the Daily Sudoku site
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tlanglet



Joined: 17 Oct 2007
Posts: 2461
Location: Northern California Foothills

PostPosted: Tue May 03, 2011 1:17 pm    Post subject: Reply with quote

A standard pattern with a twist.....

Quote:
w-wing (79)r4c5|r5c1 with SL(9)r9c158; r5c4<>7
(9)r9c1-(9=7)r5c1;
||
(9)r9c5-(9=7)r4c5;
||
(9)r9c8-r46c8=r4c9-(9=7)r4c5;

I believe that this pattern could also be viewed as a Kraken row.

Ted
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Marty R.



Joined: 12 Feb 2006
Posts: 5166
Location: Rochester, NY, USA

PostPosted: Wed May 04, 2011 4:56 am    Post subject: Reply with quote

Other than a couple of non-productive moves, I couldn't do anything with this except Medusa, and a couple of traps did the job.
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daj95376



Joined: 23 Aug 2008
Posts: 3855

PostPosted: Wed May 04, 2011 6:16 am    Post subject: Reply with quote

Marty,

FYI: here's my solver's solution. I don't think it will interfere with anyone else submitting a solution.

Code:
 after basics
 +-----------------------------------------------------------------------+
 |  4      7      23     |  9      13     123    |  6      5      8      |
 |  8      9      1      |  5      6      7      |  3      4      2      |
 |  23     6      5      |  4      38     238    |  9      1      7      |
 |-----------------------+-----------------------+-----------------------|
 |  5      1      789    |  3      79     4      |  278    2689   69     |
 |  79     4      6      |  78     2      89     |  1      3      5      |
 |  379    2      3789   |  1      5      6      |  78     89     4      |
 |-----------------------+-----------------------+-----------------------|
 |  6      5      279    |  278    13789  1389   |  4      289    39     |
 |  1      8      29     |  26     4      39     |  5      7      369    |
 |  279    3      4      |  2678   789    5      |  28     2689   1      |
 +-----------------------------------------------------------------------+
 # 57 eliminations remain

 r5  b7  turbot fish/ER                  <> 7    r7c4

 <29+3>  XY-Wing  r8c3/r1c3+r8c6         <> 3    r1c6   extraneous

 <29+8>  XYZ-Wing r7c8/r6c8+r9c7         <> 8    r9c8   extraneous

 (6=9)r4c9 - (9=7)r4c5 - (7=8)r5c4 - (8=2)r7c4 - (2=6)r8c4  =>  r8c9<>6
 +-----------------------------------------------------------------------+
 |  4      7      23     |  9      13     12     |  6      5      8      |
 |  8      9      1      |  5      6      7      |  3      4      2      |
 |  23     6      5      |  4      38     238    |  9      1      7      |
 |-----------------------+-----------------------+-----------------------|
 |  5      1      789    |  3     b79     4      |  278    2689  a69     |
 |  79     4      6      | c78     2      89     |  1      3      5      |
 |  379    2      3789   |  1      5      6      |  78     89     4      |
 |-----------------------+-----------------------+-----------------------|
 |  6      5      279    | d28     13789  1389   |  4      289    39     |
 |  1      8      29     | e26     4      39     |  5      7      39-6   |
 |  279    3      4      |  2678   789    5      |  28     269    1      |
 +-----------------------------------------------------------------------+
 # 54 eliminations remain

   c14   X-Wing                          <> 7    r9c5

 r59c1   Skyscraper                      <> 9    r4c5,r8c6

A 5-cell XY-Chain falls into the "Difficult" category. The turbot fish needed to set it up made the puzzle extra difficult.

Regards, Danny
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Marty R.



Joined: 12 Feb 2006
Posts: 5166
Location: Rochester, NY, USA

PostPosted: Wed May 04, 2011 4:39 pm    Post subject: Reply with quote

Thanks Danny. I don't see a Turbot fish/ER, but was able to eliminate 7 from r7c4 via Finned X-Wing in rows 59. I also saw the XY- and XYZ-Wings. Of course, missing an XY-Chain is as easy as falling off a log.
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daj95376



Joined: 23 Aug 2008
Posts: 3855

PostPosted: Thu May 05, 2011 12:15 am    Post subject: Reply with quote

Marty R. wrote:
Of course, missing an XY-Chain is as easy as falling off a log.

I've generated a new batch of puzzles to use once my current cache is empty. Also, starting with my next postings, I plan to return to using my rating system. Hopefully, this'll again help in dealing with my puzzles.

Regards, Danny
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