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Nov 1 DB

 
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Earl



Joined: 30 May 2007
Posts: 609
Location: Victoria, KS

PostPosted: Sat Nov 01, 2008 11:51 am    Post subject: Nov 1 DB Reply with quote

November begins with this DB which can be solved with an xy-chain eliminating the 7 in R1C9. That's the only single-step solution I could find.

Earl

Code:

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

Play this puzzle online at the Daily Sudoku site
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keith



Joined: 19 Sep 2005
Posts: 3341
Location: near Detroit, Michigan, USA

PostPosted: Sat Nov 01, 2008 2:56 pm    Post subject: Reply with quote

Quote:
I had an X-wing and a couple of nice W-wings.
Keith
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cgordon



Joined: 04 May 2007
Posts: 769
Location: ontario, canada

PostPosted: Sat Nov 01, 2008 4:01 pm    Post subject: Reply with quote

Not into chains or W's - but there are two plain old xy-wings for 248 and 238.
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Marty R.



Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA

PostPosted: Sat Nov 01, 2008 4:43 pm    Post subject: Reply with quote

Code:

+-----------+------------+-----------+
| 5   8  12 | 267 67 3   | 9  4 127  |
| 127 6  4  | 27  5  9   | 23 8 1237 |
| 27  9  3  | 8   1  4   | 5  6 27   |
+-----------+------------+-----------+
| 3   15 9  | 15  4  6   | 28 7 28   |
| 4   2  15 | 17  78 158 | 6  3 9    |
| 6   7  8  | 9   3  2   | 1  5 4    |
+-----------+------------+-----------+
| 18  15 6  | 35  2  7   | 4  9 38   |
| 28  3  25 | 4   9  58  | 7  1 6    |
| 9   4  7  | 136 68 18  | 38 2 5    |
+-----------+------------+-----------+

Play this puzzle online at the Daily Sudoku site

The 27 W-Wing in boxes 23 is enough.
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keith



Joined: 19 Sep 2005
Posts: 3341
Location: near Detroit, Michigan, USA

PostPosted: Sat Nov 01, 2008 5:16 pm    Post subject: Reply with quote

cgordon wrote:
Not into chains or W's - but there are two plain old xy-wings for 248 and 238.
I don't see them.

After basics:
Code:
+----------------+----------------+----------------+
| 5    8    12$  | 267  67   3    | 9    4   1-27% |
|1-27% 6    4    | 27   5    9    | 23$  8    1237 |
| 27&  9    3    | 8    1    4    | 5    6    27@  |
+----------------+----------------+----------------+
| 3    15   9    | 15   4    6    | 28   7    28@  |
| 4    2    15   |1-57  78   158  | 6    3    9    |
| 6    7    8    | 9    3    2    | 1    5    4    |
+----------------+----------------+----------------+
| 18#  15   6    | 35   2    7    | 4    9    38#  |
| 28@  3    25   | 4    9    58   | 7    1    6    |
| 9    4    7    | 136  68   18   | 38   2    5    |
+----------------+----------------+----------------+

X-wing in R47 takes out <5> in R5C4. (not needed?)

The cells @ are a W-wing, eliminating <2>. The pincers can be transported by coloring on <2> to the cells $. They take out <2> in the cells marked %. These cells % are now a W-wing eliminating <1> !
Cool

Solving R1C3 as <2>, and solving the puzzle.

Keith
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cgordon



Joined: 04 May 2007
Posts: 769
Location: ontario, canada

PostPosted: Sat Nov 01, 2008 6:10 pm    Post subject: Reply with quote

Quote:
I don't see them.


Keith: I must be basics-challenged cos I got nowhere near your grid. After basics I still have unsolved cells at R1C6, R6C569. So my first xy-wing for 248 can be found at pivot R4C7 and wings R6C9, R4C5. The other xy wing comes later.
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