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Set XY_02 Puzzle 29 -- Advanced

 
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daj95376



Joined: 23 Aug 2008
Posts: 3854
PostPosted: Mon Apr 20, 2009 9:50 pm    Post subject: Set XY_02 Puzzle 29 -- Advanced Reply with quote
Code:
 +-----------------------+
 | . . . | . . . | . 3 . |
 | . 5 4 | . 3 8 | 9 . . |
 | . 6 8 | 9 . . | . . . |
 |-------+-------+-------|
 | . . 7 | 1 . 4 | . . . |
 | . 3 . | . . . | . 7 . |
 | . 9 . | 3 . 7 | 4 . . |
 |-------+-------+-------|
 | . 4 . | . . 9 | 3 6 . |
 | 6 . . | . 4 . | 1 5 2 |
 | . . . | . . . | . 4 . |
 +-----------------------+

Play this puzzle online at the Daily Sudoku site
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storm_norm



Joined: 18 Oct 2007
Posts: 1741
PostPosted: Tue Apr 21, 2009 5:20 pm    Post subject: Reply with quote
Code:
.------------------.------------------.------------------.
| 9     17    12   | 4     1567  1256 | 5678  3     5678 |
| 127   5     4    | 26    3     8    | 9     12    67   |
| 3     6     8    | 9     157   125  | 57    12    4    |
:------------------+------------------+------------------:
| 8     2     7    | 1     56    4    | 56    9     3    |
| 4     3     156  | 8     9     56   | 2     7     156  |
| 15    9     156  | 3     2     7    | 4     8     156  |
:------------------+------------------+------------------:
| 1257  4     125  | 25    18    9    | 3     6     78   |
| 6     8     9    | 7     4     3    | 1     5     2    |
| 1257  17    3    | 256   168   126  | 78    4     9    |
'------------------'------------------'------------------'

xy-wing {5,6,7}
w-wing {1,2}
xyz-wing {1,2,5}
xy-wing {1,2,5}
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Marty R.



Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
PostPosted: Fri Apr 24, 2009 12:00 am    Post subject: Reply with quote
I used an XY-Wing (576), W-Wing (12), XY-Wing (125) and a 4th move.

That move was one of those with a strong link that says this cell must be one thing or that cell must be another thing. I think Norm has called it a Mixed W-Wing and Danny has referred to it as an XY-Chain from the inside out.
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tlanglet



Joined: 17 Oct 2007
Posts: 2468
Location: Northern California Foothills
PostPosted: Fri Apr 24, 2009 8:51 pm    Post subject: Reply with quote
Five steps:
xy-wing 567,
x-wing 7,
w-wing 12,
xy-wing 157,
finned x-wing 1.

Ted
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storm_norm



Joined: 18 Oct 2007
Posts: 1741
PostPosted: Fri Apr 24, 2009 10:36 pm    Post subject: Reply with quote
Code:
Norm has called it a Mixed W-Wing and Danny has referred to it as an XY-Chain from the inside out.


yeah, Very Happy

w-wings are easy to spot because of the two identical bi-value cells.
but I find the "mixed" ones by spotting the strong inference first.
like maybe there is only two 2's in a row or two 4's in a box. then look to see what bi-value cells they see.
If they do, I continue forming the chain, hence why Danny calls it "inside out" because I form the chain from the middle strong inference. I am not looking for the end bi-value cells first.
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