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Free Press March 9, 2012

 
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keith



Joined: 19 Sep 2005
Posts: 3355
Location: near Detroit, Michigan, USA
PostPosted: Sat Mar 10, 2012 1:44 pm    Post subject: Free Press March 9, 2012 Reply with quote
Not yet started ...
Code:
Puzzle: FP030912
+-------+-------+-------+
| . . 3 | . 7 . | 5 . . |
| . . 1 | 8 . . | . . . |
| . 8 . | . . 9 | . 7 . |
+-------+-------+-------+
| . 5 . | . . . | . . 8 |
| 9 . . | . 6 . | . . 3 |
| 6 . 7 | . . . | . 2 . |
+-------+-------+-------+
| . 3 . | . . . | . 6 . |
| . . 4 | . . 3 | 9 . . |
| . . 6 | . 2 . | 4 . . |
+-------+-------+-------+

Play this puzzle online at the Daily Sudoku site

Keith
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keith



Joined: 19 Sep 2005
Posts: 3355
Location: near Detroit, Michigan, USA
PostPosted: Sat Mar 10, 2012 2:44 pm    Post subject: Reply with quote
After basics:
Code:
+----------------+----------------+----------------+
| 24   9    3    | 24   7    6    | 5    8    1    |
| 7    6    1    | 8    35   25   | 23   9    4    |
| 24   8    5    | 13   14   9    | 23   7    6    |
+----------------+----------------+----------------+
| 3    5    2    | 17   9    17   | 6    4    8    |
| 9    1    8    | 24   6    24   | 7    5    3    |
| 6    4    7    | 35   358  58   | 1    2    9    |
+----------------+----------------+----------------+
| 15   3    9    | 157  14   1457 | 8    6    2    |
| 58   2    4    | 6    58   3    | 9    1    7    |
| 18   7    6    | 9    2    18   | 4    3    5    |
+----------------+----------------+----------------+

BUG+3: Either R7C46=1 or one of R6C5 R7C6=5.
Either way, R7C5=4.

Quote:
There is also a W-wing 5-8.


Keith
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Marty R.



Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
PostPosted: Sat Mar 10, 2012 4:03 pm    Post subject: Reply with quote
I used the W-Wing.

A question on BUGs. There are three cells that are non-bivalue but four possibilities. As far as terminology goes, should there be any distinction between a situation in this grid and a grid that has three trivalue cells and thus just three possibilities?

This is similar to a conventional BUG+1 with one possibility vs. the same situation but with four numbers in the one cell, thus having two possibilities.
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JC Van Hay



Joined: 13 Jun 2010
Posts: 494
Location: Charleroi, Belgium
PostPosted: Sat Mar 10, 2012 4:31 pm    Post subject: Reply with quote
Another POV of the BUG+3(cells) [or BUG+4(candidates)] ...

To avoid DP(17)r47c46 together with XW(7r47c46) => -1r7c46
BUG=[5r6c5=5r7c6] => -5r6c6; stte
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keith



Joined: 19 Sep 2005
Posts: 3355
Location: near Detroit, Michigan, USA
PostPosted: Sat Mar 10, 2012 4:53 pm    Post subject: Reply with quote
Marty R. wrote:
I used the W-Wing.

A question on BUGs. There are three cells that are non-bivalue but four possibilities. As far as terminology goes, should there be any distinction between a situation in this grid and a grid that has three trivalue cells and thus just three possibilities?

This is similar to a conventional BUG+1 with one possibility vs. the same situation but with four numbers in the one cell, thus having two possibilities.

Marty,

We've (sort of) had this discussion before.

In a BUG+N, N counts the cells with more than two candidates. It does not count the candidates. So, this is a BUG+3, not a BUG+4. Here is the Deadly Pattern:

Code:
+----------------+----------------+----------------+
| 24   9    3    | 24   7    6    | 5    8    1    |
| 7    6    1    | 8    35   25   | 23   9    4    |
| 24   8    5    | 13   14   9    | 23   7    6    |
+----------------+----------------+----------------+
| 3    5    2    | 17   9    17   | 6    4    8    |
| 9    1    8    | 24   6    24   | 7    5    3    |
| 6    4    7    | 35  38+5  58   | 1    2    9    |
+----------------+----------------+----------------+
| 15   3    9    |57+1  14   47+15| 8    6    2    |
| 58   2    4    | 6    58   3    | 9    1    7    |
| 18   7    6    | 9    2    18   | 4    3    5    |
+----------------+----------------+----------------+

I have only ever seen a BUG+1 with two extra candidates twice.

Keith
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Marty R.



Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
PostPosted: Sat Mar 10, 2012 5:11 pm    Post subject: Reply with quote
Quote:
We've (sort of) had this discussion before.

I do recall having a past discussion but didn't remember the outcome.

Thanks.
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Clement



Joined: 24 Apr 2006
Posts: 1111
Location: Dar es Salaam Tanzania
PostPosted: Sat Mar 10, 2012 9:26 pm    Post subject: Free Press March 9, 2012 Reply with quote
M-Wing 35 in r6c4 and r2c5; r6c6<>5 solves it.
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