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Nov 1 DB

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Earl

Joined: 30 May 2007
Posts: 677
Location: Victoria, KS

Posted: Sat Nov 01, 2008 11:51 am Post subject: Nov 1 DB

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

keith

Joined: 19 Sep 2005
Posts: 3355
Location: near Detroit, Michigan, USA

Posted: Sat Nov 01, 2008 2:56 pm Post subject:

Quote:

I had an X-wing and a couple of nice W-wings.

Keith

cgordon

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

Posted: Sat Nov 01, 2008 4:01 pm Post subject:

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

Marty R.

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

Posted: Sat Nov 01, 2008 4:43 pm Post subject:

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.

keith

Joined: 19 Sep 2005
Posts: 3355
Location: near Detroit, Michigan, USA

Posted: Sat Nov 01, 2008 5:16 pm Post subject:

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

cgordon

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

Posted: Sat Nov 01, 2008 6:10 pm Post subject:

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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