Another Sudoku I couldn´t solve

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Another Sudoku I couldn´t solve

Postby NoClue » Sun Apr 10, 2011 12:01 pm

Hi, all,

I tried to solve the Sudoku # 647900 (very hard):

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


I hardly found ANY hidden singles, this is what I could find out:

Code: Select all
+-----------+------+-------------+
|45 346 35..|2 1 68|458 7... 9...|
|9. 136 7...|4 5 68|2.. 138. 13..|
|2. 8.. 15..|9 3 7.|145 6... 145.|
+-----------+------+-------------+
|1. 5.. 8...|7 9 4.|3.. 2... 6...|
|3. 7.. 49..|1 6 2.|45. 59.. 8...|
|6. 2.. 49..|5 8 3.|7.. 19.. 14..|
+-----------+------+-------------+
|8. 9.. 12..|3 7 5.|6.. 4... 12..|
|45 34. 6...|8 2 1.|9.. 35.. 7...|
|7. 13. 1235|6 4 9.|158 1358 1235|
+-----------+------+-------------+


The biggest problems for me are:

1. the right start
2. to find TOO LESS (!!!) hidden singles
3. to pencilmark TOO MANY (!!!) cells
4. to find LESS than NO logic

I am sure, that I am the ONLY one in the WHOLE WORLD with LESS than NO brain! Otherwise I can´t explain why I can´t solve such EXTREMELY EASY Sudokus :-(((((

Any hints and tipps are appreciated. Thanks in advance
NoClue
 
Posts: 48
Joined: 01 April 2011

Postby Pat » Sun Apr 10, 2011 12:56 pm

NoClue wrote:I tried to solve the Sudoku # 647900 (very hard):

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


I hardly found ANY hidden singles

this is what I could find out:
Code: Select all
 *-----------------------------------------------------------*
 | 45    346   35    | 2     1     68    | 458   7     9     |
 | 9     136   7     | 4     5     68    | 2     138   13    |
 | 2     8     15    | 9     3     7     | 145   6     145   |
 |-------------------+-------------------+-------------------|
 | 1     5     8     | 7     9     4     | 3     2     6     |
 | 3     7     49    | 1     6     2     | 45    59    8     |
 | 6     2     49    | 5     8     3     | 7     19    14    |
 |-------------------+-------------------+-------------------|
 | 8     9     12    | 3     7     5     | 6     4     12    |
 | 45    34    6     | 8     2     1     | 9     35    7     |
 | 7     13    1235  | 6     4     9     | 158   1358  1235  |
 *-----------------------------------------------------------*

28 cells given + 25 "hidden singles" = 53
(and you did get that far).
but this puzzle does need a tougher move --
finned X-wing excludes 1 at r9c2
    the 1 for columns 3,7
    is only in rows 3,9
    except (a "fin") r7c3
User avatar
Pat
 
Posts: 3438
Joined: 18 July 2005

Re: Another Sudoku I couldn´t solve

Postby NoClue » Sun Apr 10, 2011 4:58 pm

Hi, Pat,

many thanks for the tip with the "Finned X-Wing". I have extreme problems to spot strategies like this one. Even though I am dealing with Sudoku for more than 4 years.It´s like I have LESS than NO brain - LESS than NO memory - I hope to get endless frustrated, until I´ll get MUCH better in playing Sudoku
NoClue
 
Posts: 48
Joined: 01 April 2011


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