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Free Press Nov 26, 2010

 
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keith



Joined: 19 Sep 2005
Posts: 3355
Location: near Detroit, Michigan, USA
PostPosted: Fri Nov 26, 2010 1:37 pm    Post subject: Free Press Nov 26, 2010 Reply with quote
Not yet begun:
Code:
Puzzle: FP112610
+-------+-------+-------+
| 5 9 . | . . . | . 3 4 |
| . . . | . . 5 | . . . |
| 4 . . | . . 1 | . . 7 |
+-------+-------+-------+
| . 5 . | . 6 . | 8 . . |
| 1 4 . | . . 2 | . 5 . |
| . . 8 | . . . | . 6 . |
+-------+-------+-------+
| 8 . . | 9 . . | . . . |
| . . . | 1 . . | . . . |
| 6 7 . | . . . | . 9 1 |
+-------+-------+-------+

Play this puzzle online at the Daily Sudoku site

Keith
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Marty R.



Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
PostPosted: Fri Nov 26, 2010 6:26 pm    Post subject: Reply with quote
Quote:
Potential DP (79) in boxes 45; looking at killers, r4c4=7 is quickly forced, after which the grid is reduced to a BUG+1.
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peterj



Joined: 26 Mar 2010
Posts: 974
Location: London, UK
PostPosted: Fri Nov 26, 2010 8:21 pm    Post subject: Reply with quote
A skyscraper(7) is perhaps the most straightforward solution...

Another DP move is this 6-cell DP(23)
Code:
*-------------------------------------------------------------*
 | 5       9     27    | 6     278   78    | 1     3     4     |
 | 37      8     1     | 347   347   5     | 9     2     6     |
 | 4       6     23    | 23    9     1     | 5     8     7     |
 |---------------------+-------------------+-------------------|
 | *23+79  5     3-79  | 47    6     479   | 8     1     *23   |
 | 1       4     6     | 38    38    2     | 7     5     9     |
 | (79)    *23   8     | 5     1     79    | 4     6     *23   |
 |---------------------+-------------------+-------------------|
 | 8       1     34    | 9     247   3467  | 236   47    5     |
 | *23+9   *23   3459  | 1     457   3467  | 36    47    8     |
 | 6       7     345   | 248   2458  348   | 23    9     1     |
 *-------------------------------------------------------------*

ADP(23)[(7)r4c1=(9)r48c1] - (9=7)r6c1 ; r4c3<>7
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keith



Joined: 19 Sep 2005
Posts: 3355
Location: near Detroit, Michigan, USA
PostPosted: Fri Nov 26, 2010 8:40 pm    Post subject: Reply with quote
There are at least two skyscrapers on 7. One of them is a one-stepper.

There are also a number of interesting UR / DP moves.

Keith
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