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July 19 DB

 
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Earl



Joined: 30 May 2007
Posts: 677
Location: Victoria, KS
PostPosted: Sat Jul 19, 2008 11:54 am    Post subject: July 19 DB Reply with quote
The July 19 DB kept me busy. Coloring, a few wings, and THREE xy-chains to finish it. There must be a more direct route.

Earl

Code:

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

Play this puzzle online at the Daily Sudoku site
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nataraj



Joined: 03 Aug 2007
Posts: 1048
Location: near Vienna, Austria
PostPosted: Sat Jul 19, 2008 4:01 pm    Post subject: Re: July 19 DB Reply with quote
Earl wrote:
Coloring, a few wings, and THREE xy-chains to finish it. There must be a more direct route.


If there is a more direct route, I did not find it either.

Coloring (4)
xy-wing 41-13-34
xy-chain ('93' in r7c8 to '59' in r9c3)
xy-chain ('23' in r3c7 to '42' in r5c4)
XYZ-wing '4 6 9 ' (r5c6)

and some more xy-chains here:
Code:

+--------------------------+--------------------------+--------------------------+
| 3       9       5        | 7       2       1        | 8       4       6        |
| 28      48      24       | 5       36      36       | 9       7       1        |
| 6       7       1        | 9       4       8        | 23      5       23       |
+--------------------------+--------------------------+--------------------------+
| 28      5       26       | 3       168     69       | 7       169     4        |
| 7       1       46       | 2       5       469      | 36      8       39       |
| 9       48      3        | 48      16      7        | 1256    126     25       |
+--------------------------+--------------------------+--------------------------+
| 5       6       7        | 1       38      2        | 4       39      89       |
| 4       3       8        | 6       9       5        | 12      12      7        |
| 1       2       9        | 48      7       34       | 56      36      58       |
+--------------------------+--------------------------+--------------------------+
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storm_norm



Joined: 18 Oct 2007
Posts: 1741
PostPosted: Sat Jul 19, 2008 7:32 pm    Post subject: Reply with quote
wow Shocked

did the newspaper check the difficulty on that one??
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