Please help me find the next step...

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Please help me find the next step...

Postby RichardWilson » Sun Jul 16, 2017 1:56 pm

The puzzle below was generated from the Sudoku Grab app. It is from it's hardest level.

I know I must be overlooking the next clue to solving the puzzle; I just cannot find the next technique/logic to continue solving it. Can you help me figure out what to do next?

Thanks,
Richard Wilson
Clayton, NC
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Postby Pat » Mon Jul 17, 2017 11:09 am

(7) r26\c37 + fin r2c1
==> exclude 7 at r1c3

Code: Select all
 6 5 . | 8 . . | 4 . .
 . . 9 | 4 6 . | . 5 1
 2 4 1 | 9 7 5 | 8 3 6
-------+-------+------
 9 6 5 | . . 4 | . . 8
 . . 4 | . 5 . | 6 . .
 1 2 . | 6 9 8 | . 4 5
-------+-------+------
 5 7 8 | 3 2 9 | 1 6 4
 3 1 6 | 5 4 7 | 9 8 2
 4 9 2 | 1 8 6 | 5 7 3
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Re: Please help me find the next step...

Postby Leren » Mon Jul 17, 2017 10:09 pm

65.8..4....946..51241975836965..4..8..4.5.6..12.698.45578329164316547982492186573

Code: Select all
*-----------------------------------------------------*
| 6    5   b37    | 8    13   12    | 4    29  a79    |
| 78   38   9     | 4    6    23    | 2-7  5    1     |
| 2    4    1     | 9    7    5     | 8    3    6     |
|-----------------+-----------------+-----------------|
| 9    6    5     | 27   13   4     | 237  12   8     |
| 78   38   4     | 27   5    13    | 6    129  9-7   |
| 1    2   c37    | 6    9    8     |d37   4    5     |
|-----------------+-----------------+-----------------|
| 5    7    8     | 3    2    9     | 1    6    4     |
| 3    1    6     | 5    4    7     | 9    8    2     |
| 4    9    2     | 1    8    6     | 5    7    3     |
*-----------------------------------------------------*

There is a Skyscraper in 7's in cells a-b-c-d => - 7 r2c7, r5c9. If you are unfamilar with Skyscrapers you can read about them here.

An alternative interpretation for the same 4 cells is a Sashimi Finned XWing in 7's r16 c39 with a fin Cell r6c7 which only eliminates the 7 at r5c9. You can read about this move here.

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