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Puzzle 10/06/19: (C) XY

 
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daj95376



Joined: 23 Aug 2008
Posts: 3854
PostPosted: Sat Jun 19, 2010 3:21 pm    Post subject: Puzzle 10/06/19: (C) XY Reply with quote
Code:
 +-----------------------+
 | 1 5 . | . . . | . . . |
 | 8 4 . | 6 1 5 | . . . |
 | . . . | . . 4 | . 1 . |
 |-------+-------+-------|
 | . 1 . | 5 . 9 | 7 6 . |
 | . 6 . | . . . | . . 1 |
 | . 8 9 | 1 . 7 | . . 4 |
 |-------+-------+-------|
 | . . . | 8 . . | 6 . . |
 | . . 8 | 4 . . | . . 9 |
 | . . . | . 2 1 | . 4 8 |
 +-----------------------+

Play this puzzle online at the Daily Sudoku site

Code:
 after basics
 +--------------------------------------------------------------+
 |  1     5     237   |  279   379   8     |  4     237   6     |
 |  8     4     237   |  6     1     5     |  23    9     237   |
 |  69    379   2367  |  27    37    4     |  8     1     5     |
 |--------------------+--------------------+--------------------|
 |  23    1     4     |  5     8     9     |  7     6     23    |
 |  57    6     57    |  3     4     2     |  9     8     1     |
 |  23    8     9     |  1     6     7     |  235   235   4     |
 |--------------------+--------------------+--------------------|
 |  4     29    1     |  8     59    3     |  6     257   27    |
 |  57    23    8     |  4     57    6     |  1     23    9     |
 |  69    379   3567  |  79    2     1     |  35    4     8     |
 +--------------------------------------------------------------+
 # 47 eliminations remain
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peterj



Joined: 26 Mar 2010
Posts: 974
Location: London, UK
PostPosted: Sun Jun 20, 2010 11:48 am    Post subject: Reply with quote
I went looking for m-wings and found this interesting contradiction loop involving a near-flightless m-wing (at least I think I have, I'm a bit green on contradictions...!?)

Quote:
m-wing(57) (7=5)r8c5 - r7c5=(5-7)r7c8=r1c8; (r1c5<>7)
but...
(7)r1c8 - r2c9=r2c3 - r5c3=r5c1 - r8c1=r8c5; r8c5=7

... then singles
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Marty R.



Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
PostPosted: Tue Jun 22, 2010 1:01 am    Post subject: Reply with quote
I used an ER (7) and W-Wing (79).
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