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Free Press February 8, 2013

 
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keith



Joined: 19 Sep 2005
Posts: 3136
Location: near Detroit, Michigan, USA

PostPosted: Sat Feb 09, 2013 8:02 pm    Post subject: Free Press February 8, 2013 Reply with quote

Not so easy, maybe ...

Code:
Puzzle: FP020813
+-------+-------+-------+
| 6 4 . | . . . | . . 1 |
| . 5 . | . . . | . 7 . |
| . . 2 | 4 1 . | . . . |
+-------+-------+-------+
| . . . | 2 . . | 5 9 . |
| . . . | 3 . 4 | . . . |
| . 9 4 | . . 5 | 8 . . |
+-------+-------+-------+
| . . . | . 2 3 | 1 . . |
| . 8 . | . . . | . 3 . |
| 2 . . | . . . | . 4 5 |
+-------+-------+-------+

Play this puzzle online at the Daily Sudoku site

Keith
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Marty R.



Joined: 12 Feb 2006
Posts: 5063
Location: Rochester, NY, USA

PostPosted: Sun Feb 10, 2013 2:01 am    Post subject: Reply with quote

Code:

+-------------+-----------------+---------+
| 6   4  79   | 79    5   2     | 3  8 1  |
| 189 5  189  | 689   3   689   | 4  7 2  |
| 78  3  2    | 4     1   78    | 69 5 69 |
+-------------+-----------------+---------+
| 3   16 167  | 2     78  178   | 5  9 4  |
| 58  2  58   | 3     9   4     | 67 1 67 |
| 17  9  4    | 167   67  5     | 8  2 3  |
+-------------+-----------------+---------+
| 4   7  59   | 59    2   3     | 1  6 8  |
| 159 8  1569 | 15679 4   1679  | 2  3 79 |
| 2   16 3    | 16789 678 16789 | 79 4 5  |
+-------------+-----------------+---------+

Play this puzzle online at the Daily Sudoku site

I couldn't find anything to open it up, so I started hacking away.

XY-Chain (8=7)r3c1-(7=9)r1c3-(9=5)r7c3)-(5=8)r5c3=>r5c1<>8
X-Wing on 9 in r17
Sashimi X-Wing on 7 in r14
Skyscraper on 7 in r36

Those left me here:

Code:

+----------+---------------+---------+
| 6  4  79 | 79   5  2     | 3  8 1  |
| 89 5  1  | 68   3  689   | 4  7 2  |
| 78 3  2  | 4    1  78    | 69 5 69 |
+----------+---------------+---------+
| 3  16 67 | 2    78 18    | 5  9 4  |
| 5  2  8  | 3    9  4     | 67 1 67 |
| 17 9  4  | 16   67 5     | 8  2 3  |
+----------+---------------+---------+
| 4  7  59 | 59   2  3     | 1  6 8  |
| 19 8  56 | 1567 4  1679  | 2  3 79 |
| 2  16 3  | 1678 68 16789 | 79 4 5  |
+----------+---------------+---------+

Play this puzzle online at the Daily Sudoku site

At this point it mercifully ended with a short XY-Chain:
(7=1)r6c1-(1=6)r6c4-(6=8)r2c4-(8=7)r3c6=>r3c1<>7

I have to think there are shorter routes but I had already invested more than enough time on this thing. Very Happy
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Marty R.



Joined: 12 Feb 2006
Posts: 5063
Location: Rochester, NY, USA

PostPosted: Sun Feb 10, 2013 4:51 am    Post subject: Reply with quote

Upon further review, it looks like the X-Wing and Sashimi and the last XY-Chain would've been enough.
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