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Free Press April 19, 2013

 
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keith



Joined: 19 Sep 2005
Posts: 3355
Location: near Detroit, Michigan, USA

PostPosted: Mon Apr 22, 2013 4:19 am    Post subject: Free Press April 19, 2013 Reply with quote

Somewhat tougher?

Code:
Puzzle: FP041913
+-------+-------+-------+
| . . . | . 2 . | . . 1 |
| . . . | . . 6 | 2 . . |
| 1 7 . | . 5 . | 4 . 6 |
+-------+-------+-------+
| . . 3 | 2 . . | 1 . 7 |
| . . 9 | . . . | 6 . . |
| 2 . . | . . 8 | 9 . . |
+-------+-------+-------+
| 4 . . | . 1 . | . 3 2 |
| . . 1 | 9 . . | . . . |
| 7 . . | . 8 . | . . . |
+-------+-------+-------+

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: Mon Apr 22, 2013 4:02 pm    Post subject: Reply with quote

Code:

+------------+------------+-----------+
| 689 68  45 | 478 2  479 | 3 589 1   |
| 389 38  45 | 1   49 6   | 2 7   58  |
| 1   7   2  | 38  5  39  | 4 89  6   |
+------------+------------+-----------+
| 568 568 3  | 2   49 49  | 1 58  7   |
| 58  4   9  | 357 37 1   | 6 2   358 |
| 2   1   7  | 35  6  8   | 9 4   35  |
+------------+------------+-----------+
| 4   9   8  | 6   1  5   | 7 3   2   |
| 35  235 1  | 9   37 237 | 8 6   4   |
| 7   23  6  | 34  8  234 | 5 1   9   |
+------------+------------+-----------+

Play this puzzle online at the Daily Sudoku site

Didn't see a good non-chain solution.

(5=8)r4c8-r5c9=r2c9-(8=3)r2c2-(32=5)r98c2=>r4c2<>5

Code:

+-----------+----------+----------+
| 689 68 45 | 48 2  7  | 3 589 1  |
| 89  3  45 | 1  49 6  | 2 7   58 |
| 1   7  2  | 38 5  39 | 4 89  6  |
+-----------+----------+----------+
| 568 68 3  | 2  49 49 | 1 58  7  |
| 58  4  9  | 7  3  1  | 6 2   58 |
| 2   1  7  | 5  6  8  | 9 4   3  |
+-----------+----------+----------+
| 4   9  8  | 6  1  5  | 7 3   2  |
| 3   5  1  | 9  7  2  | 8 6   4  |
| 7   2  6  | 34 8  34 | 5 1   9  |
+-----------+----------+----------+

Play this puzzle online at the Daily Sudoku site

W-Wing (89), b13, SL 9 in r1=>r2c9<>8
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JC Van Hay



Joined: 13 Jun 2010
Posts: 494
Location: Charleroi, Belgium

PostPosted: Mon Apr 22, 2013 4:52 pm    Post subject: Reply with quote

After Singles + Locked Candidates + Subsets :
Code:
+---------------------+---------------+-----------------+
| 58(69)   568    458 | 478  2   479  | 3   (589)  1    |
| 58-3(9)  (358)  458 | 1    49  6    | 2   7      (58) |
| 1        7      2   | 38   5   39   | 4   89     6    |
+---------------------+---------------+-----------------+
| 58(6)    (568)  3   | 2    49  49   | 1   (58)   7    |
| 58       4      9   | 357  37  1    | 6   2      358  |
| 2        1      7   | 35   6   8    | 9   4      35   |
+---------------------+---------------+-----------------+
| 4        9      58  | 6    1   57   | 78  3      2    |
| 358      2358   1   | 9    37  2357 | 78  6      4    |
| 7        23     6   | 34   8   234  | 5   1      9    |
+---------------------+---------------+-----------------+
#1. Chain[7] : 9r2c1=9r1c1-[9r1c8 and 6r1c1=6r4c1-6r4c2]=RP(58)r4c28.r1c8.r2c9-(58=3)r2c2 :=> -3r2c1; 15 Singles; LC(5) :=> -5r12c1
or
Invalid Pattern (58)r1c8.r2c29.r4c28
||
3r2c2
||
6r4c2-6r4c1=(6-9)r1c1=9r2c1
||
9r1c8-9r1c1=9r2c1

#2. Chain[3] : XYWing(4-89)r1c4.r2c15 :=> -8r1c12
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Marty R.



Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA

PostPosted: Mon Apr 22, 2013 7:02 pm    Post subject: Reply with quote

I guess I have to withdraw my solution. Looking at JC's grid, it is apparent I erred in basics by solving r7c3 for 8. Embarassed Embarassed
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