The New Sudoku Players' Forum

[Der0nk3l]

Hi there,

I´m from Germany and relatively new in doing Sudoku Puzzles so I would be kind if you can help me with this puzzle i´m showing below.
I actually started the puzzle until this point and now i´m stuck. I think it is a hard puzzle.

Code: Select all

. 7 6 | . . 3 | . 5 .
. 1 9 | . . . | 3 6 .
5 8 3 | . . . | 2 . 7
------+-------+------
. 2 4 | . . 9 | . . .
. . . | . . . | . . 3
9 . 1 | . . 5 | 7 . .
------+-------+------
6 4 . | . 3 . | . 7 .
. . 2 | . 6 . | . . 1
1 9 7 | . . . | 6 3 2

I only know a fiew techniques so it would be great when you can explain me why an where the other numbers have to be. And i would like to know how i can see faster, where potential is, to find the next number.

Thank you in advance!!

[200e200w]

Hi, Der0nk3l!
First, you missed some basic moves. Here is the pencilmark grid after all possible basic moves:

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.-------------.----------------------.------------------.
| 24   7   6  | 1248    12489  3     | 1489  5      489 |
| 24   1   9  | 57      57     248   | 3     6      48  |
| 5    8   3  | 146     149    146   | 2     149    7   |
:-------------+----------------------+------------------:
| 378  2   4  | 13678   178    9     | 158   18     568 |
| 78   56  58 | 124678  12478  12468 | 1489  12489  3   |
| 9    36  1  | 23468   248    5     | 7     248    468 |
:-------------+----------------------+------------------:
| 6    4   58 | 12      3      12    | 589   7      589 |
| 38   35  2  | 9       6      7     | 458   48     1   |
| 1    9   7  | 458     458    48    | 6     3      2   |
'-------------'----------------------'------------------'


Then, you can use a Continuous Nice Loop and a W-Wing to yield 17 singles.

Code: Select all

(3)r4c4 = r4c1 - (3=58)b7p34 - 5r7c9 = (5-6)r4c9 = r4c4 - loop => -178 r4c4, -8 r4c9, -5 r7c7
(3=6)r4c4 - r4c9 = r6c9 - (6=3)r6c2 => -3 r4c1,r6c4


200e200w

[Der0nk3l]

Thank you

[Der0nk3l]

I can find how to read your way to solve the puzzle... (i dont understand what the code means) can you send me a discription or a tutorial how to read it?