July 28, 2018

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July 28, 2018

Postby ArkieTech » Sat Jul 28, 2018 11:50 am

Code: Select all
 *-----------*
 |.3.|4..|215|
 |5..|.3.|...|
 |..4|..7|.6.|
 |---+---+---|
 |2..|...|7..|
 |..5|.4.|9..|
 |..9|...|..6|
 |---+---+---|
 |.4.|7..|1..|
 |...|.8.|..3|
 |982|..3|.5.|
 *-----------*


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Re: July 28, 2018

Postby SCLT » Sat Jul 28, 2018 12:22 pm

Code: Select all
+--------------------+------------------+---------------+
| *678    3  *67-8   |  4     69  c89   |  2   1    5   |
|  5      9   16     |  2     3    16   |  8   7    4   |
|  18     2   4      |  58    15   7    |  3   6    9   |
+--------------------+------------------+---------------+
|  2      6   38     |*a358   59  b89   |  7   4    1   |
|  38     7   5      |  16    4    16   |  9   38   2   |
|  4      1   9      |  38    7    2    |  5   38   6   |
+--------------------+------------------+---------------+
|  36     4   36     |  7     2    5    |  1   9    8   |
|  17     5   17     |  9     8    4    |  6   2    3   |
|  9      8   2      |  16    16   3    |  4   5    7   |
+--------------------+------------------+---------------+

BUG+3  =>  -8 r1c3:

  * 8r1c1 - r1c3
  * (6-8)r1c3
  * 8r4c4 - r4c6 = r1c6 - r1c3 (abc)
Last edited by SCLT on Sat Jul 28, 2018 2:07 pm, edited 1 time in total.
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Re: July 28, 2018

Postby SteveG48 » Sat Jul 28, 2018 1:30 pm

Code: Select all
 *---------------------------------------------------*
 |ad678  3  ad678  | 4    9-6 d89   | 2    1    5    |
 |  5    9   b1-6  | 2    3    16   | 8    7    4    |
 |  18   2    4    | 58   15   7    | 3    6    9    |
 *-----------------+----------------+----------------|
 |  2    6   b38   | 358  59  c89   | 7    4    1    |
 |  38   7    5    | 16   4    16   | 9    38   2    |
 |  4    1    9    | 38   7    2    | 5    38   6    |
 *-----------------+----------------+----------------|
 |  36   4   b36   | 7    2    5    | 1    9    8    |
 |  17   5    17   | 9    8    4    | 6    2    3    |
 |  9    8    2    | 16   16   3    | 4    5    7    |
 *---------------------------------------------------*


6r1c13 = (368)r247c3 - 8r4c6 = (678)r1c136 => -6 r1c5,r2c3 ; stte
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Re: July 28, 2018

Postby Cenoman » Sat Jul 28, 2018 2:22 pm

Hard as I tried, couldn't find more complicate !
Code: Select all
 +-------------------+------------------+-----------------+
 |  78-6* 3   a678*  |  4    C69   89   |  2    1    5    |
 |  5     9   c16    |  2     3    16   |  8    7    4    |
 |  18    2    4     |  58    15   7    |  3    6    9    |
 +-------------------+------------------+-----------------+
 |  2     6    38*   | A358* B59   89   |  7    4    1    |
 |  38*   7    5     |  16    4    16   |  9    38*  2    |
 |  4     1    9     |  38*   7    2    |  5    38*  6    |
 +-------------------+------------------+-----------------+
 |  36*   4    36*   |  7     2    5    |  1    9    8    |
 |  17    5   b17    |  9     8    4    |  6    2    3    |
 |  9     8    2     |  16    16   3    |  4    5    7    |
 +-------------------+------------------+-----------------+

10 cells Deadly Pattern (*) (68)r1c13, (36)r7c13, (38)b4p34, r46c4, r56c8 using internals (7r1c13==5r4c4):
(7)r1c1
(7)r1c3 - (7=1)r8c3 - (1=6)r2c3 (a, b, c)
(5)r4c4 - (5=9)r4c5 - (9=6)r1c5 (A, B, C)
=> -6 r1c1; ste
Last edited by Cenoman on Sat Jul 28, 2018 8:40 pm, edited 1 time in total.
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Re: July 28, 2018

Postby David P Bird » Sat Jul 28, 2018 7:53 pm

SCLT This isn't a BUG + 3 using digit 8 as it is false in all three of the tri-value cells!

I don't usually get involved in these one steppers as they tend to complicate simple puzzles. However, I tried to use your solution to show how a bug + 3 could be notated as an AIC.

Code: Select all
+--------------------+------------------+---------------+
| *678    3  *678    |  4     69  89    |  2   1    5   |
|  5      9   16     |  2     3    16   |  8   7    4   |
|  18     2   4      |  58    15   7    |  3   6    9   |
+--------------------+------------------+---------------+
|  2      6   38     | *358   59   89   |  7   4    1   |
|  38     7   5      |  16    4    16   |  9   38   2   |
|  4      1   9      |  38    7    2    |  5   38   6   |
+--------------------+------------------+---------------+
|  36     4   36     |  7     2    5    |  1   9    8   |
|  17     5   17     |  9     8    4    |  6   2    3   |
|  9      8   2      |  16    16   3    |  4   5    7   |
+--------------------+------------------+---------------+

[8] r3c4 = r1c6 - r1c13 =[BUG+3]= r1c3,c4c4 – r4c3 = r5c1 – r5c8 = r6c8 => r6c4 <> 8

If the BUG+3 was genuine then at least one of the starred cells must hold (8).
If it is r1c1 then the cell pair used on the left of the BUG strong link will hold a truth
If it is r4c4 then the pair used on the right will hold a truth
If it is r1c3 then both pairs will hold the same truth

However as the bug isn't valid, the elimination this produces is false - which surprised me.
It demonstrates that we shouldn't go jumping to conclusions when we get distributions that look like BUGs.

I won't spoil it by pointing out the cause of the problem.

DPB
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Re: July 28, 2018

Postby SCLT » Sat Jul 28, 2018 8:49 pm

David P Bird wrote:SCLT This isn't a BUG + 3 using digit 8 as it is false in all three of the tri-value cells!


I think you need to read my solution more carefully ;)

The BUG+3 is not on three 8s - it is on 8r1c1, 8r4c4 and 6r1c3!
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Re: July 28, 2018

Postby David P Bird » Sat Jul 28, 2018 9:49 pm

SCLT wrote:I think you need to read my solution more carefully

So I now see. So, I've hoisted myself on my own petard - I'm the one that shouldn't be jumping to conclusions!

Sorry for casting asparagus aspersions.

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Re: July 28, 2018

Postby SteveG48 » Sat Jul 28, 2018 10:47 pm

David P Bird wrote:Sorry for casting asparagus aspersions.

DPB


Casting asparagus. That brings back fond memories of a colleague now long gone. May he rest in peace.
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Re: July 28, 2018

Postby pjb » Sat Jul 28, 2018 11:39 pm

Code: Select all
 678     3       678    | 4      69     89     | 2      1      5     
 5       9      c16     | 2      3      16     | 8      7      4     
b18      2       4      | 58     15     7      | 3      6      9     
------------------------+----------------------+---------------------
 2       6       8-3    | 358    59     89     | 7      4      1     
a38      7       5      | 16     4      16     | 9      38     2     
 4       1       9      | 38     7      2      | 5      38     6     
------------------------+----------------------+---------------------
 6-3     4      d36     | 7      2      5      | 1      9      8     
 17      5       17     | 9      8      4      | 6      2      3     
 9       8       2      | 16     16     3      | 4      5      7     

(3=8)r5c1 - (8=1)r3c1 - (1=6)r2c3 - (6=3)r7c3 => -3 r4c3, r7c1; stte

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