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Free Press July 13, 2012

 
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keith



Joined: 19 Sep 2005
Posts: 3355
Location: near Detroit, Michigan, USA
PostPosted: Fri Jul 13, 2012 7:15 pm    Post subject: Free Press July 13, 2012 Reply with quote
Not yet started.
Code:
Puzzle: FP071312
+-------+-------+-------+
| 3 . . | . 1 5 | . . 7 |
| . . . | . . 9 | 6 2 . |
| . . 7 | . . . | . . . |
+-------+-------+-------+
| . . . | 5 . . | . 4 . |
| 5 7 . | 8 . 6 | . . 2 |
| . 8 . | . . 2 | . 1 . |
+-------+-------+-------+
| . . . | . . . | 5 . . |
| . 4 3 | 9 . . | . . . |
| 9 . . | 1 6 . | . . 4 |
+-------+-------+-------+

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 Jul 13, 2012 10:23 pm    Post subject: Reply with quote
Code:

+--------------+------------+------------+
| 3    269 268 | 26  1   5  | 4 89   7   |
| 14   15  45  | 7   38  9  | 6 2    38  |
| 68   269 7   | 246 238 34 | 1 5    389 |
+--------------+------------+------------+
| 2    3   9   | 5   7   1  | 8 4    6   |
| 5    7   1   | 8   4   6  | 9 3    2   |
| 46   8   46  | 3   9   2  | 7 1    5   |
+--------------+------------+------------+
| 1678 16  68  | 24  23  34 | 5 6789 189 |
| 1678 4   3   | 9   5   78 | 2 678  18  |
| 9    25  25  | 1   6   78 | 3 78   4   |
+--------------+------------+------------+

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W-Wing (68), boxes 17, SL 6 in c2; r1c3<>8
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keith



Joined: 19 Sep 2005
Posts: 3355
Location: near Detroit, Michigan, USA
PostPosted: Sat Jul 14, 2012 1:39 am    Post subject: Reply with quote
UR 78: R8C8=6.
DP 78 in B789: R1C8=8.

Keith
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Marty R.



Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
PostPosted: Sat Jul 14, 2012 3:53 am    Post subject: Reply with quote
After the Type1:

Code:

+--------------+------------+-----------+
| 3    269 268 | 26  1   5  | 4 89  7   |
| 14   15  45  | 7   38  9  | 6 2   38  |
| 68   269 7   | 246 238 34 | 1 5   389 |
+--------------+------------+-----------+
| 2    3   9   | 5   7   1  | 8 4   6   |
| 5    7   1   | 8   4   6  | 9 3   2   |
| 46   8   46  | 3   9   2  | 7 1   5   |
+--------------+------------+-----------+
| 1678 16  68  | 24  23  34 | 5 789 189 |
| 178  4   3   | 9   5   78 | 2 6   18  |
| 9    25  25  | 1   6   78 | 3 78  4   |
+--------------+------------+-----------+

Play this puzzle online at the Daily Sudoku site

How do you arrive at r1c8=8?
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keith



Joined: 19 Sep 2005
Posts: 3355
Location: near Detroit, Michigan, USA
PostPosted: Sat Jul 14, 2012 4:02 am    Post subject: Reply with quote
Marty R. wrote:
After the Type1:

Code:

+--------------+------------+-----------+
| 3    269 268 | 26  1   5  | 4 89  7   |
| 14   15  45  | 7   38  9  | 6 2   38  |
| 68   269 7   | 246 238 34 | 1 5   389 |
+--------------+------------+-----------+
| 2    3   9   | 5   7   1  | 8 4   6   |
| 5    7   1   | 8   4   6  | 9 3   2   |
| 46   8   46  | 3   9   2  | 7 1   5   |
+--------------+------------+-----------+
|*1678 16  68  | 24  23  34 |5 *789 189 |
|*178  4   3   | 9   5  *78 |2  6   18  |
| 9    25  25  | 1   6  *78 |3 *78  4   |
+--------------+------------+-----------+

Play this puzzle online at the Daily Sudoku site

How do you arrive at r1c8=8?

Potential DP 78 is labeled *.
Either:
R78C1=16; 16 pair in B7; R7C3=8; R1C8=8.
or:
R7C8=9; 18 pair in C9; R1C8=8.

Keith
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Marty R.



Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
PostPosted: Sat Jul 14, 2012 5:07 am    Post subject: Reply with quote
Thanks. I was just attacking it in a different way, trying to use pincers. The pincers in r7c3 and r1c8 take out the 8 from r1c3 which makes r1c8=8. I should have followed up a little more closely.
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Clement



Joined: 24 Apr 2006
Posts: 1111
Location: Dar es Salaam Tanzania
PostPosted: Sat Jul 14, 2012 6:10 pm    Post subject: Free Press July 13, 2012 Reply with quote
XY-Chain
If r7c2=1, then, r2c2=5 ->r2c3=4 ->r6c3=6; r7c3<>6 solves it.
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keith



Joined: 19 Sep 2005
Posts: 3355
Location: near Detroit, Michigan, USA
PostPosted: Sat Jul 14, 2012 7:54 pm    Post subject: Reply with quote
After basics:
Code:
+----------------+----------------+----------------+
| 3    269  268  | 26   1    5    | 4    89   7    |
| 14   15   45   | 7    38   9    | 6    2    38   |
| 68   269  7    | 246  238  34   | 1    5    389  |
+----------------+----------------+----------------+
| 2    3    9    | 5    7    1    | 8    4    6    |
| 5    7    1    | 8    4    6    | 9    3    2    |
| 46   8    46   | 3    9    2    | 7    1    5    |
+----------------+----------------+----------------+
| 1678 16   68   | 24   23   34   | 5    6789 189  |
| 1678 4    3    | 9    5    78   | 2    678  18   |
| 9    25   25   | 1    6    78   | 3    78   4    |
+----------------+----------------+----------------+

To avoid the DP, either
R78C1 is 16, forming a 16 pair in B7; R7C3 is 8. Or
R7C8 is 68, forming an XY-wing 6-89.

Either way, R1C3 <>8, solving the puzzle.

Keith
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