which technique next?

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which technique next?

Postby Helloise » Thu Nov 02, 2023 8:03 am

Code: Select all

5679  579       69 |      8      2      3     |569   4          1
1        8          39 |      4      5      6     | 7     2          39 
256   235       4    |      7      9      1     |5      8          36
------------------+--------------------+-------------------
27       4         1   |     6       8      9     | 23    39        5
569      59       8   |     2       3     7      |4       1        69
3         279     269|     1       4      5     |269   2679    8
------------------+--------------------+-------------------
8           6       359|     35      7     2  |  1     359        4
59          1        7  |     35      6     4  |  8     359        2
4           25      235|      9      1     8  |  36    356        7



Please can someone tell me which technique next?

how can i also make it so that it appears all in line when posted?
Helloise
 
Posts: 1
Joined: 31 October 2023

Re: which technique next?

Postby Cenoman » Fri Dec 01, 2023 1:29 pm

Hard to help you solving the puzzle, because your pencil marks (pm in our common use in this forum) are inconsistant. They should look like this (look at the digits, forget the separators...):

Code: Select all
 +---------------------+-----------------+-------------------+
 |  5679   579   569   |  8    2    3    |  69    4     1    |
 |  1      8     39    |  4    5    6    |  7     2     39   |
 |  26     23    4     |  7    9    1    |  5     8     36   |
 +---------------------+-----------------+-------------------+
 |  27     4     1     |  6    8    9    |  23    37    5    |
 |  569    59    8     |  2    3    7    |  4     1     69   |
 |  3      279   269   |  1    4    5    |  269   679   8    |
 +---------------------+-----------------+-------------------+
 |  8      6     359   |  35   7    2    |  1     359   4    |
 |  59     1     7     |  35   6    4    |  8     359   2    |
 |  4      235   235   |  9    1    8    |  36    356   7    |
 +---------------------+-----------------+-------------------+


Here is yours, with inconsistencies:
Code: Select all
5679  579     69  |     8      2     3 |  569   4      1      -5r1c3  +5r1c7
1     8       39  |     4      5     6 |  7     2      39
256   235     4   |     7      9     1 |  5     8      36             +5r3c12
------------------+--------------------+-------------------
27    4       1   |     6      8     9 |  23    39     5      -7r4c8  +9r4c8
569   59      8   |     2      3     7 |  4     1      69
3     279     269 |     1      4     5 |  269   2679   8              +2r6c8
------------------+--------------------+-------------------
8     6       359 |     35     7     2 |  1     359    4
59    1       7   |     35     6     4 |  8     359    2
4     25      235 |     9      1     8 |  36    356    7      -3r9c2


The digits in excess +5r1c7, +5r3c12, +9r4c8, +2r6c8 should be eliminated due to the placements you got: 5r3c7, 9r4c6, 2r2c8.
For the missing digits 5r1c3, 7r4c8, 3r9c2, I don't know how you got their eliminations. They are actually not part of the puzzle solution. If your eliminations are valid steps, then the puzzle is solved with singles:
- no 7 @r4c8 => +7 r4c1; ste (ste Singles To the End)
- no 3 @r9c2 => +3 r3c2; ste

Otherwise, using only your 52 placements (givens or solved cells), i.e. with my pm above, a last step named AIC (Alternate Inference Chain) is needed:
(6=3)r3c9 - r3c2 = r9c2 - (3=6) r9c7 => r1c7<>6; ste
As I can't know your skills in this kind of technique, I do not explain further, but I can try to do so later.

To have your pm all in line, you must have it already in line before posting it, e.g. using "Notepad" with Windows OS, or using any text software allowing fixed fonts. The "code" "/code" (with square brackets) tags must be used to avoid the space character compression, so to have the pm displayed in its original format.
Cenoman
Cenoman
 
Posts: 3000
Joined: 21 November 2016
Location: France


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