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July 10 DB

 
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Earl



Joined: 30 May 2007
Posts: 677
Location: Victoria, KS
PostPosted: Sat Jul 10, 2010 3:19 pm    Post subject: July 10 DB Reply with quote
The July 10 DB is a clean colorful one shot.


A Solution: Color 3


Earl


Code:

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

Play this puzzle online at the Daily Sudoku site
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storm_norm



Joined: 18 Oct 2007
Posts: 1741
PostPosted: Sun Jul 25, 2010 6:54 pm    Post subject: Reply with quote
pretty nifty DP here.



the DP is the 13, 37, 17

across r78c367, it says that r7c3 cannot be 1 and 3 to avoid the DP.
IOW, r7c3 has to be a 5.
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ronk



Joined: 07 May 2006
Posts: 398
PostPosted: Sun Jul 25, 2010 8:10 pm    Post subject: Reply with quote
storm_norm wrote:
pretty nifty DP here.

...

the DP is the 13, 37, 17

across r78c367, it says that r7c3 cannot be 1 and 3 to avoid the DP.
IOW, r7c3 has to be a 5.

Similar to a UR Type 1, your deduction could be called a BUG-Lite Type 1. A BUG-Lite Type 4 exists as well.

______

In all columns external to the uniqueness pattern, the only uniqueness digit that can kill the deadly pattern is r3c3=3.

[edit: "Type 4" was incorrectly stated to be "Type 2".]

Last edited by ronk on Mon Aug 02, 2010 5:12 pm; edited 1 time in total
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storm_norm



Joined: 18 Oct 2007
Posts: 1741
PostPosted: Sun Jul 25, 2010 8:18 pm    Post subject: Reply with quote
there we go, now the brain is firing on all cylinders
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