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March 1 DB

 
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Earl



Joined: 30 May 2007
Posts: 677
Location: Victoria, KS
PostPosted: Sat Mar 01, 2008 3:23 pm    Post subject: March 1 DB Reply with quote
The March 1 DB comes in like a lion, with an UR (89) type 3, virtual cell of 47. Other solutions?

Earl


Code:

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

Play this puzzle online at the Daily Sudoku site

Earl
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Marty R.



Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
PostPosted: Sat Mar 01, 2008 4:39 pm    Post subject: Reply with quote
Quote:
The March 1 DB comes in like a lion, with an UR (89) type 3, virtual cell of 47. Other solutions?

My 89 UR was a type 1 and that's all that was needed. I'm sure there would be numerous other solutions if one ignored the UR.
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ravel



Joined: 21 Apr 2006
Posts: 536
PostPosted: Sat Mar 01, 2008 6:02 pm    Post subject: Reply with quote
Marty R. wrote:
I'm sure there would be numerous other solutions if one ignored the UR.
E.g. a half M-wing Smile
Code:
*-----------------------------------------------------------*
 | 2     347   38    | 5     47    1     | 48    9     6     |
 | 6     47    5     | 89    89    47    | 1     2     3     |
 | 48    9     1     | 3     2     6     | 48    5     7     |
 |-------------------+-------------------+-------------------|
 | 3     1     7     | 4     5     8     | 2     6     9     |
 | 5     8     2     | 6     1     9     | 3     7     4     |
 | 9     6     4     | 7     3     2     | 5     8     1     |
 |-------------------+-------------------+-------------------|
 |-478  #34   -389   | 2     479   347   | 6     1     5     |
 | 1     5     6     | 89    4789  347   | 79    34    2     |
 |@47    2    @39    | 1     6     5     | 79   #34    8     |
 *-----------------------------------------------------------*
The 34's can be connected by
r8c2=4 => r9c1<>4 => r9c8=4
strong ling for 3 in r9 => r7c3<>3
also
r8c2=3 => r9c3<>3 => r9c8=3
strong ling for 4 in r9 => r7c1<>4
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keith



Joined: 19 Sep 2005
Posts: 3355
Location: near Detroit, Michigan, USA
PostPosted: Sat Mar 01, 2008 6:44 pm    Post subject: Reply with quote
ravel wrote:
E.g. a half M-wing Smile


A double half M-wing Question Surprised

Thank you, ravel. I have a hard time spotting these when the links occupy the same line, like here.

Keith
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storm_norm



Joined: 18 Oct 2007
Posts: 1741
PostPosted: Sun Mar 02, 2008 7:27 am    Post subject: Reply with quote
I think the lion came with eliminating the box/line interactions. once the 89 UR was visible, it was smooth sailing.
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