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Free Press September 9, 2011

 
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keith



Joined: 19 Sep 2005
Posts: 3355
Location: near Detroit, Michigan, USA
PostPosted: Sat Sep 10, 2011 2:14 am    Post subject: Free Press September 9, 2011 Reply with quote
Not as difficult as some?
Code:
Puzzle: FP090911
+-------+-------+-------+
| 3 . . | 2 8 . | 6 . 5 |
| . 1 . | . . . | 9 8 . |
| . . . | . 5 . | . . . |
+-------+-------+-------+
| . 2 5 | . . . | 3 . . |
| . . . | 4 . 3 | . . 8 |
| . . 3 | . . . | 1 9 . |
+-------+-------+-------+
| . . . | . 6 . | . . . |
| . 5 9 | . . . | . 3 . |
| 4 . . | . 9 2 | . . 7 |
+-------+-------+-------+

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: Sat Sep 10, 2011 3:41 pm    Post subject: Reply with quote
Quote:
Not as difficult as some?

I didn't find it particularly difficult, but it was stubborn, or more likely, I missed something. I played four XY-Wings and a BUG+3.
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keith



Joined: 19 Sep 2005
Posts: 3355
Location: near Detroit, Michigan, USA
PostPosted: Sat Sep 10, 2011 6:48 pm    Post subject: Reply with quote
After basics:
Code:
+-------------------+-------------------+-------------------+
| 3     79    47    | 2     8     1479  | 6     147   5     |
| 5     1     2467  | 67    3     467   | 9     8     24    |
| 279   6789  24678 | 1679  5     14679 | 47    1247  3     |
+-------------------+-------------------+-------------------+
| 178   2     5     | 689   17    689   | 3     47    46    |
| 179   679   167   | 4     127   3     | 57    257   8     |
| 78    4     3     | 568   27    568   | 1     9     26    |
+-------------------+-------------------+-------------------+
| 127   378   1278  | 135   6     15    | 458   45    9     |
| 6     5     9     | 78    4     78    | 2     3     1     |
| 4     38    18    | 135   9     2     | 58    6     7     |
+-------------------+-------------------+-------------------+
An XY-wing 4-57 in C78, and then another 2-79 in C12 lead to:
Code:
+----------------+----------------+----------------+
| 3    79   47   | 2    8    479  | 6    1    5    |
| 5    1    2467 | 67   3    467  | 9    8    24   |
| 29   69   8    | 1    5    469  | 7    24   3    |
+----------------+----------------+----------------+
| 178  2    5    | 9    17   68   | 3    47   46   |
| 179  679  67   | 4    127  3    | 5    27   8    |
|-78   4    3    | 68   27b  5    | 1    9    26   |
+----------------+----------------+----------------+
| 27a  8    27   | 3    6    1    | 4    5    9    |
| 6    5    9    | 78   4    78   | 2    3    1    |
| 4    3    1    | 5    9    2    | 8    6    7    |
+----------------+----------------+----------------+
a and b are a remote pair (or W-wing), solving the puzzle. (Connect a and b by coloring on 2.)

Keith
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Marty R.



Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
PostPosted: Sat Sep 10, 2011 7:54 pm    Post subject: Reply with quote
I had the same first two moves as you, but missed the W-Wing.
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keith



Joined: 19 Sep 2005
Posts: 3355
Location: near Detroit, Michigan, USA
PostPosted: Sat Sep 24, 2011 2:10 am    Post subject: Reply with quote
SS says:

1 x Simple Forcing Chains
2 x XY-Wing
3 x Intersection Removal
1 x Simple Naked Sets
17 x Pinned Squares

Seems not too bad.

Keith
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