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Como resolvo este?

dailysudoku.com Forum Index -> Solving techniques, and terminology

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kiutrej

Joined: 20 May 2012
Posts: 2

Posted: Sun May 20, 2012 1:39 pm Post subject: Como resolvo este?

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]

Marty R.

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

Posted: Sun May 20, 2012 3:21 pm Post subject:

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

keith

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

Posted: Sun May 20, 2012 3:26 pm Post subject:

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

kiutrej

Joined: 20 May 2012
Posts: 2

Posted: Sun May 20, 2012 7:53 pm Post subject:

Thanks

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