I couldn´t solve THAT EASY Sudoku :-(

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I couldn´t solve THAT EASY Sudoku :-(

Postby NoClue » Mon Apr 11, 2011 10:45 pm

Hi, all,

I doubt and I fear that I always need help from others to solve Sudokus FOR THE REST OF MY LIFE...

Here is the EXTREMELY EASY Sudoku, which I couldn´t solve (it´s from the website sudoku.spieleck.de - sudoku from April 9th, 2011):

Code: Select all
+-----+-----+-----+
|. 9 .|. . .|. . .|
|6 . .|. . 5|. . .|
|. . .|1 . .|. . 7|
+-----+-----+-----+
|. . 2|. . .|. . .|
|. . 4|. 7 .|. . .|
|3 . .|. . .|8 6 .|
+-----+-----+-----+
|. . .|. . .|. . .|
|. 7 1|. . .|. . 4|
|. . .|. 2 3|. 5 .|
+-----+-----+-----+


Here is the VERY LITTLE part of my TRY of solving:

Code: Select all
+---------+-----------------+-----------------+
|7. 9. 358|23468. 3468. 2468|12356 12348 23568|
|6. 1. 38.|7..... 3489. 5...|239.. 23489 2389.|
|4. 2. 358|1..... 3689. 689.|3569. 389.. 7....|
+---------+-----------------+-----------------+
|19 68 2..|35689. 35689 689.|4.... 7.... 359..|
|19 68 4..|235689 7.... 2689|12359 1239. 2359.|
|3. 5. 7..|249... 49... 1...|8.... 6.... 29...|
+---------+-----------------+-----------------+
|25 3. 69.|45689. 1.... 7...|269.. 289.. 2689.|
|25 7. 1..|5689.. 5689. 689.|2369. 2389. 4....|
|8. 4. 69.|69.... 2.... 3...|7.... 5.... 1....|
+---------+-----------------+-----------------+


With this 17-clue Sudoku I hardly found ANY hidden singles (only 16 hidden singles and 1 naked single) - so I had to pencilmark 47 (!!!!!) cells, but I am the ONLY ONE in the WHOLE WORLD who will NEVER BE ABLE to see logical steps ...

Any hints and tips are appreciated
NoClue
 
Posts: 48
Joined: 01 April 2011

Re: I couldn´t solve THAT EASY Sudoku :-(

Postby JasonLion » Tue Apr 12, 2011 2:28 am

Where in block 8 can you put a 4?
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Re: I couldn´t solve THAT EASY Sudoku :-(

Postby NoClue » Tue Apr 12, 2011 7:41 am

Hi, JasonLion,

after posting this article I saw that in block 4: r4c1 = 1 and r5c1 = 9

your tip with block 8: r7c4 = 4 - was very helpful too.

Thanks for the tip!
NoClue
 
Posts: 48
Joined: 01 April 2011

Re: I couldn´t solve THAT EASY Sudoku :-(

Postby NoClue » Tue Apr 12, 2011 8:05 am

Hi, JasonLion,

with your tip - r7c4 = 4 - I could solve the Sudoku now:

Code: Select all
+-----+-----+-----+
|7 9 5|2 3 4|1 8 6|
|6 1 8|7 9 5|2 4 3|
|4 2 3|1 6 8|5 9 7|
+-----+-----+-----+
|1 8 2|3 5 6|4 7 9|
|9 6 4|8 7 2|3 1 5|
|3 5 7|9 4 1|8 6 2|
+-----+-----+-----+
|5 3 6|4 1 7|9 2 8|
|2 7 1|5 8 9|6 3 4|
|8 4 9|6 2 3|7 5 1|
+-----+-----+-----+


Many thanks again for this big help!
NoClue
 
Posts: 48
Joined: 01 April 2011

Postby Pat » Tue Apr 12, 2011 9:26 am

NoClue wrote:---I hardly found ANY hidden singles
so I had to pencilmark 47 (!!!!!) cells

    the "pencilmarks" could conceivably help you
    when you're solving a tough puzzle

      but
      when the puzzle is rated "easy"
      you should really assume it is easy

        -- and in that case,
        adding "pencilmarks" only makes it tougher
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