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Sept 26 BD

 
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Earl



Joined: 30 May 2007
Posts: 677
Location: Victoria, KS
PostPosted: Sat Sep 26, 2009 1:56 pm    Post subject: Sept 26 BD Reply with quote
The Sept 26 BD is a one-stepper.

Solution: skyscraper in 7's


Earl


Code:

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

Play this puzzle online at the Daily Sudoku site
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tlanglet



Joined: 17 Oct 2007
Posts: 2468
Location: Northern California Foothills
PostPosted: Sat Sep 26, 2009 2:29 pm    Post subject: Reply with quote
Continuing the recent use of UR implications, I used the UR56 in r23c34 to form a simple chain.

Code:

 *-----------------------------------------------------------------------------*
 | 1       3       4       | 78      9       2       | 5       78      6       |
 | 2       57      568     | 156     478     15      | 3       9       478     |
 | 78      9       56      | 56      478     3       | 2       1       478     |
 |-------------------------+-------------------------+-------------------------|
 | 6       14      9       | 2       5       7       | 148     48      3       |
 | 47      147     2       | 3       6       8       | 9       45      15      |
 | 5       8       3       | 4       1       9       | 7       6       2       |
 |-------------------------+-------------------------+-------------------------|
 | 48      2       58      | 9       37      6       | 14      3457    157     |
 | 9       6       1       | 578     2378    45      | 48      234578  578     |
 | 3       45      7       | 158     28      145     | 6       2458    9       |


(4=5)r8c6 - (5=1)r2c6 - UR56[(1)r2c4 = (8)r2c3] - (8=5)r7c3 - (5=4)r9c2; r9c4<>4.

Ted
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