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Jan 17 DB

 
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Earl



Joined: 30 May 2007
Posts: 677
Location: Victoria, KS
PostPosted: Sat Jan 17, 2009 3:43 pm    Post subject: Jan 17 DB Reply with quote
The Jan 17 DB presents different paths, but a (367) xy-wing does it in one step.

Earl

Code:

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

Play this puzzle online at the Daily Sudoku site
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keith



Joined: 19 Sep 2005
Posts: 3355
Location: near Detroit, Michigan, USA
PostPosted: Sat Jan 17, 2009 7:30 pm    Post subject: Reply with quote
After the XY-wing eliminations, you can use transport (coloring on <7>) to make two additional eliminations. There is a UR which makes some of the same eliminations.

Keith
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