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Free Press February 15, 2013

 
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keith



Joined: 19 Sep 2005
Posts: 3179
Location: near Detroit, Michigan, USA

PostPosted: Fri Feb 15, 2013 4:18 pm    Post subject: Free Press February 15, 2013 Reply with quote

Code:
Puzzle: FP021513
+-------+-------+-------+
| . . 6 | 1 . 9 | . . . |
| . . 7 | . . . | . . 9 |
| . . 9 | 2 . . | 7 . 8 |
+-------+-------+-------+
| . 7 . | . . 1 | . 3 . |
| . . . | . 4 . | . . . |
| . 8 . | 7 5 . | . 2 . |
+-------+-------+-------+
| 5 . 8 | . . . | 3 . . |
| 4 . . | . . . | 6 . . |
| . . . | 8 . 4 | 1 . . |
+-------+-------+-------+

Play this puzzle online at the Daily Sudoku site

Keith
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Marty R.



Joined: 12 Feb 2006
Posts: 5166
Location: Rochester, NY, USA

PostPosted: Fri Feb 15, 2013 9:09 pm    Post subject: Reply with quote

Code:

+---------------+------------+--------------+
| 8    25   6   | 1 7    9   | 245 45  3    |
| 123  1235 7   | 4 368  38  | 25  16  9    |
| 13   4    9   | 2 36   5   | 7   16  8    |
+---------------+------------+--------------+
| 26   7    245 | 9 28   1   | 458 3   456  |
| 1269 12   125 | 3 4    28  | 589 57  1567 |
| 139  8    134 | 7 5    6   | 49  2   14   |
+---------------+------------+--------------+
| 5    129  8   | 6 129  27  | 3   479 247  |
| 4    1239 123 | 5 1239 237 | 6   8   27   |
| 7    6    23  | 8 239  4   | 1   59  25   |
+---------------+------------+--------------+

Play this puzzle online at the Daily Sudoku site

I wasted a lot of time with the DP 13-36-16 in band 1 which eliminated the 2 in r4c1, but that didn't open up anything. Then I noticed the 27 UR in b89.

(4r7c9=3r8c6)-r8c23=r9c3-r6c3=r6c1-(13=2)r32c1-(2=5)r2c7-(5=4)r1c8-r7c8=r7c9=>r7c8,r46c9<>4

That brings us here:

Code:

+---------------+------------+-----------+
| 8    25   6   | 1 7    9   | 25 4  3   |
| 123  1235 7   | 4 368  38  | 25 16 9   |
| 13   4    9   | 2 36   5   | 7  16 8   |
+---------------+------------+-----------+
| 26   7    245 | 9 28   1   | 48 3  56  |
| 1269 12   125 | 3 4    28  | 89 57 567 |
| 139  8    134 | 7 5    6   | 49 2  1   |
+---------------+------------+-----------+
| 5    129  8   | 6 129  27  | 3  79 247 |
| 4    1239 123 | 5 1239 237 | 6  8  27  |
| 7    6    23  | 8 239  4   | 1  59 25  |
+---------------+------------+-----------+

Play this puzzle online at the Daily Sudoku site

The Type 1 UR on 25 in b13 finishes it off.


Last edited by Marty R. on Fri Feb 15, 2013 9:21 pm; edited 1 time in total
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JC Van Hay



Joined: 13 Jun 2010
Posts: 372
Location: Charleroi, Belgium

PostPosted: Fri Feb 15, 2013 9:15 pm    Post subject: Reply with quote

Solving row 3 or the XWing(3C26) : r3c1=3 or r8c2=3=r2c6 ->contradiction (no 5R4) :=> r1c5=3 or r8c6=3=r2c2;ste

Interpretation :
Code:
+--------------------+----------------+-------------------+
| 8      25    6     | 1  7     9     | 245    45   3     |
| 123    1235  7     | 4  368   -3(8) | 25     16   9     |
| 1(3)   4     9     | 2  6(3)  5     | 7      16   8     |
+--------------------+----------------+-------------------+
| 26     7     2(45) | 9  28    1     | 4(58)  3    46(5) |
| 1269   12    125   | 3  4     2(8)  | 59(8)  57   1567  |
| 19(3)  8     1(34) | 7  5     6     | 49     2    14    |
+--------------------+----------------+-------------------+
| 5      129   8     | 6  129   27    | 3      479  247   |
| 4      1239  123   | 5  1239  237   | 6      8    27    |
| 7      6     (23)  | 8  239   4     | 1      59   (25)  |
+--------------------+----------------+-------------------+
Chain[8] : Kraken 5R4 : 8r2c6=3r3c5 :=> -3r2c6;ste

(5-8)r4c7=8r5c7-8r5c6=8r2c6
 ||
[(5-4)r4c3=4r6c3 or 5r4c9-(5=2)r9c9-(2=3)r9c3]-3r6c3=3r6c1-3r2c1=3r3c5
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keith



Joined: 19 Sep 2005
Posts: 3179
Location: near Detroit, Michigan, USA

PostPosted: Mon Jul 01, 2013 7:58 pm    Post subject: Reply with quote

(Note date on original post.)

Marty,

You gave up too soon! After basics:
Code:
+----------------+----------------+----------------+
| 8    25   6    | 1    7    9    | 245  45   3    |
| 123  1235 7    | 4    368  38   | 25   16   9    |
| 13   4    9    | 2    36   5    | 7    16   8    |
+----------------+----------------+----------------+
| 26   7    245  | 9    28   1    | 458  3    456  |
| 1269 12   125  | 3    4    28   | 589  57   1567 |
| 139  8    134  | 7    5    6    | 49   2    14   |
+----------------+----------------+----------------+
| 5    129  8    | 6    129  27   | 3    479  247  |
| 4    1239 123  | 5    1239 237  | 6    8    27   |
| 7    6    23   | 8    239  4    | 1    59   25   |
+----------------+----------------+----------------+

Note the DP 16-13-36 in R23. Either R2C1=2 or R2C5=8. Eliminating 2 in R4C1.
Code:
+----------------+----------------+----------------+
| 8    25   6    | 1    7    9    | 245  45   3    |
| 123  1235 7    | 4    368  38   | 25   16   9    |
| 13   4    9    | 2    36   5    | 7    16   8    |
+----------------+----------------+----------------+
| 6    7   2-45  | 9    28   1    | 458  3   D45   |
| 129  12   125  | 3    4    28   | 589  7    6    |
| 39   8   A34   | 7    5    6    |-49   2    1    |
+----------------+----------------+----------------+
| 5    129  8    | 6    129  27   | 3    49   247  |
| 4    1239 123  | 5    1239 237  | 6    8    27   |
| 7    6   B23   | 8    239  4    | 1    59  C25   |
+----------------+----------------+----------------+

AD are pincers on 4.

Keith
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Marty R.



Joined: 12 Feb 2006
Posts: 5166
Location: Rochester, NY, USA

PostPosted: Mon Jul 01, 2013 11:38 pm    Post subject: Reply with quote

Quote:
You gave up too soon!


Are you seeing a pattern here? Embarassed
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keith



Joined: 19 Sep 2005
Posts: 3179
Location: near Detroit, Michigan, USA

PostPosted: Mon Jul 01, 2013 11:59 pm    Post subject: Reply with quote

Marty R. wrote:
Quote:
You gave up too soon!


Are you seeing a pattern here? Embarassed

Marty,

No! I was just remarking that your baroque chain proving R6C9 = 1 is a result of the DP elimination of 2 in R4C1 that you did not pursue.

You might also note it has taken me over three months to get to this one.

Keith
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