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May 24 DB

 
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Earl



Joined: 30 May 2007
Posts: 677
Location: Victoria, KS
PostPosted: Sat May 24, 2008 1:01 pm    Post subject: May 24 DB Reply with quote
The May 24 DB goes down with a single blow, a skyscraper in <6>.


Earl

Code:

+-------+-------+-------+
| 3 . . | 7 . . | . 2 . |
| 1 6 2 | . 3 . | . 9 . |
| . . . | . . 9 | 3 . . |
+-------+-------+-------+
| . 4 . | 6 . . | . . 7 |
| . 7 . | . . . | . 8 . |
| 8 . . | . . 1 | . 4 . |
+-------+-------+-------+
| . . 4 | 9 . . | . . . |
| . 8 . | . 6 . | 5 3 4 |
| . 3 . | . . 8 | . . 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 May 24, 2008 2:31 pm    Post subject: Reply with quote
Code:
+-------------+-------------+-------------+
| 3   9   8   | 7   15  6   | 4   2   15  |
| 1   6   2   | 458 3   45  | 7   9   58  |
| 4   5   7   | 28  12  9   | 3   6   18  |
+-------------+-------------+-------------+
| 9   4   3   | 6   8   2   | 1   5   7   |
| 56# 7   1   | 345 9   45  | 26@ 8  -236 |
| 8   2   56  | 35  7   1   | 9   4   36  |
+-------------+-------------+-------------+
| 56# 1   4   | 9   25  3   | 8   7   26@ |
| 2   8   9   | 1   6   7   | 5   3   4   |
| 7   3   56  | 25  4   8   |-26  1   9   |
+-------------+-------------+-------------+


There is a Type-4 UR here. But, I prefer the W-wing @ with strong link # that takes out <2> in R5C9 and R9C7.

Keith
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Marty R.



Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
PostPosted: Sat May 24, 2008 3:35 pm    Post subject: Reply with quote
keith wrote:
Code:
+-------------+-------------+-------------+
| 3   9   8   | 7   15  6   | 4   2   15  |
| 1   6   2   | 458 3   45  | 7   9   58  |
| 4   5   7   | 28  12  9   | 3   6   18  |
+-------------+-------------+-------------+
| 9   4   3   | 6   8   2   | 1   5   7   |
| 56# 7   1   | 345 9   45  | 26@ 8  -236 |
| 8   2   56  | 35  7   1   | 9   4   36  |
+-------------+-------------+-------------+
| 56# 1   4   | 9   25  3   | 8   7   26@ |
| 2   8   9   | 1   6   7   | 5   3   4   |
| 7   3   56  | 25  4   8   |-26  1   9   |
+-------------+-------------+-------------+


There is a Type-4 UR here. But, I prefer the W-wing @ with strong link # that takes out <2> in R5C9 and R9C7.

Keith

Couple of interesting other options to accomplish the same thing.

1) Simple coloring on 6 takes out the 6 in r5c7

2) The relatively uncommon XY-Wing chain with the three 56s acting as the XY cell and the pincers in r5c7 and r9c4.
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