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Puzzle 11/04/25: B Moderate (BBDB?)

 
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daj95376



Joined: 23 Aug 2008
Posts: 3855

PostPosted: Mon Apr 25, 2011 11:09 pm    Post subject: Puzzle 11/04/25: B Moderate (BBDB?) Reply with quote

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

Play this puzzle online at the Daily Sudoku site
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peterj



Joined: 26 Mar 2010
Posts: 974
Location: London, UK

PostPosted: Tue Apr 26, 2011 12:52 pm    Post subject: Reply with quote

Loads of moves to play in this one - this path has just two wings...
Quote:
m-wing(79) (7=9)r1c9 - r6c8=(9-7)r6c5=r4c5 ; r4c9<>7
l-wing(39) (9)r1c8=r6c8 - r6c5=r2c5 - (3)r2c5=r1c5 ; r1c8<>3
(Admit to spending more time finding a nice path than finding the patterns!)
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daj95376



Joined: 23 Aug 2008
Posts: 3855

PostPosted: Wed Apr 27, 2011 1:01 am    Post subject: Reply with quote

Peter, nice catch on the Wings.

FWIW: This puzzle has one of those simple patterns ... that can be viewed as a more complex pattern ... that can be transformed into an even more complex pattern.

Code:
 after basics
 +-----------------------------------------------------------------------+
 |  5      1237   8      |  6     #1239   4      |  1237  g39    *179    |
 |  2367   12367  137    |  28    g1239   1289   |  12357  359    4      |
 |  9      1234   134    |  7      5      12     |  123    8      6      |
 |-----------------------+-----------------------+-----------------------|
 |  4      257    9      |  1      27     3      |  8      6      57     |
 |  237    237    6      |  25     8      259    |  4      1     *79     |
 |  8      157    157    |  4     *79     6      |  357   *359    2      |
 |-----------------------+-----------------------+-----------------------|
 |  67     45678  457    |  3      16     158    |  9      2      158    |
 |  1      58     2      |  9      4      58     |  6      7      3      |
 |  36     9      35     |  258    126    7      |  15     4      158    |
 +-----------------------------------------------------------------------+
 # 86 eliminations remain

Simple pattern (*): 2-String Kite r6c9 => r1c5<>9

Complex pattern (*+#) + (g): Broken Wing w/guardians r1c8,r2c5 => r1c5,r2c8<>9

Transformed guardian cell: (9-3)r2c5 = r1c5 - (3=9)r1c8 => r1c8=9

Alternately:

Code:
 Skyscraper r25c6              =>  r1c9<>9
 ||
 (9-3)r2c5 = r1c5 - (3=9)r1c8  =>  r1c9<>9

There's an extended almost M-Wing, but I think the other examples are enough.

Keith: Yes, I used a backdoor elimination.
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Marty R.



Joined: 12 Feb 2006
Posts: 5123
Location: Rochester, NY, USA

PostPosted: Wed Apr 27, 2011 4:41 am    Post subject: Reply with quote

Numerous moves, as usual.

XY-Wing (275), flightless
Hidden UR (58)
M-Wing (79)
W-Wing (12)
DP (14-15-45)
XY-Chain
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peterj



Joined: 26 Mar 2010
Posts: 974
Location: London, UK

PostPosted: Wed Apr 27, 2011 5:47 pm    Post subject: Reply with quote

daj95376 wrote:
There's an extended almost M-Wing, but I think the other examples are enough.

I think an almost-gm-wing is going to be a tough spot generally (for me)! Sky/turbot and w-/y- wings are not too bad, but I find spotting gm-wings hard enough never mind if one part of them is "almost"!
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