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Como resolvo este?

 
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kiutrej



Joined: 20 May 2012
Posts: 2

PostPosted: Sun May 20, 2012 1:39 pm    Post subject: Como resolvo este? Reply with quote

I'm blocked in this one.. so i ask for a tip (red) but i don't understand the logic. Can you explain it to me...

Code:

+-------+-------+-------+
| 8 7 2 | . 5 1 | 4 . 3 |
| . 6 . | . 2 .  | . 7 1 |
| 9 1 . | 3 7 . | 2 [color=red]6[/color] . |
+-------+-------+-------+
| 7 2 . | . 3 5 | . 4 . |
| . 8 . | . 4 7 | 3 . 2 |
| . 3 . | 2 9 . | . 1 7 |
+-------+-------+-------+
| 2 5 7 | 4 8 9 | 1 3 6 |
| . . . | 7 1 2 | . 8 . |
| 1 . 8 | 5 6 3 | 7 2 . |
+-------+-------+-------+

Play this puzzle online at the Daily Sudoku site[/img]
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Marty R.



Joined: 12 Feb 2006
Posts: 5122
Location: Rochester, NY, USA

PostPosted: Sun May 20, 2012 3:21 pm    Post subject: Reply with quote

Code:

+-------------+-----------+-------------+
| 8   7  2    | 69  5 1   | 4   69  3   |
| 345 6  345  | 89  2 48  | 589 7   1   |
| 9   1  45   | 3   7 468 | 2   56  58  |
+-------------+-----------+-------------+
| 7   2  169  | 168 3 5   | 689 4   89  |
| 56  8  1569 | 16  4 7   | 3   569 2   |
| 456 3  456  | 2   9 68  | 568 1   7   |
+-------------+-----------+-------------+
| 2   5  7    | 4   8 9   | 1   3   6   |
| 346 49 3469 | 7   1 2   | 59  8   459 |
| 1   49 8    | 5   6 3   | 7   2   49  |
+-------------+-----------+-------------+

Play this puzzle online at the Daily Sudoku site
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keith



Joined: 19 Sep 2005
Posts: 3150
Location: near Detroit, Michigan, USA

PostPosted: Sun May 20, 2012 3:26 pm    Post subject: Reply with quote

Here is your puzzle as posted, with all possibilities:
Code:
+----------------+----------------+----------------+
| 8    7    2    | 69   5    1    | 4    69   3    |
| 345  6    345  | 89   2    48   | 589  7    1    |
| 9    1    45   | 3    7    468  | 2    56   58   |
+----------------+----------------+----------------+
| 7    2    169  | 168  3    5    | 689  4    89   |
| 56   8    1569 | 16   4    7    | 3    569  2    |
| 456  3    456  | 2    9    68   | 568  1    7    |
+----------------+----------------+----------------+
| 2    5    7    | 4    8    9    | 1    3    6    |
| 346  49   3469 | 7    1    2    | 59   8    459  |
| 1    49   8    | 5    6    3    | 7    2    49   |
+----------------+----------------+----------------+
After simplifying:
Code:
+-------------+-------------+-------------+
| 8   7   2   | 69  5   1   | 4   69  3   |
| 345 6   345 | 89  2   48  | 589 7   1   |
| 9   1   45  | 3   7   468 | 2  -56 *58  |
+-------------+-------------+-------------+
| 7   2   19  | 168 3   5   | 689 4  #89  |
| 56  8   19  | 16  4   7   | 3  *59  2   |
| 456 3   456 | 2   9   68  | 568 1   7   |
+-------------+-------------+-------------+
| 2   5   7   | 4   8   9   | 1   3   6   |
| 36  49  36  | 7   1   2   | 59  8   459 |
| 1   49  8   | 5   6   3   | 7   2   49  |
+-------------+-------------+-------------+
The pattern marked is an XY-Wing which eliminates 5 in R2C8.

I hope that helps.

Keith
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kiutrej



Joined: 20 May 2012
Posts: 2

PostPosted: Sun May 20, 2012 7:53 pm    Post subject: Reply with quote

Thanks Wink
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