April 19, 2019

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April 19, 2019

Postby ArkieTech » Fri Apr 19, 2019 10:53 am

Code: Select all
 *-----------*
 |...|.2.|.3.|
 |..5|..4|...|
 |29.|1..|..4|
 |---+---+---|
 |.7.|8..|...|
 |.43|...|62.|
 |...|..9|.7.|
 |---+---+---|
 |9..|..8|.51|
 |...|5..|4..|
 |.1.|.3.|...|
 *-----------*


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Re: April 19, 2019

Postby Leren » Fri Apr 19, 2019 11:09 am

Code: Select all
*--------------------------------------*
| 4  68   1    | 69 2 7 | 589  3  56   |
| 37 36   5    | 69 8 4 | 279  1  267  |
| 2  9   f6-78 | 1  5 3 | 78  e68 4    |
|--------------+--------+--------------|
| 1  7    9    | 8  6 2 | 35   4  35   |
| 8  4    3    | 7  1 5 | 6    2  9    |
| 6  5    2    | 3  4 9 | 1    7  8    |
|--------------+--------+--------------|
| 9  236  46   | 24 7 8 | 23   5  1    |
| 37 238 a78   | 5  9 1 | 4   d68 2367 |
| 5  1   b478  | 24 3 6 |c278  9  27   |
*--------------------------------------*

(7=8) r8c3 - (8) r9c3 = r9c7 - r8c8 = (8-6) r3c8 = (6) r3c3 => - 78 r3c3; stte

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Re: April 19, 2019

Postby SpAce » Fri Apr 19, 2019 11:30 am

Code: Select all
.----------------.----------.-------------------.
| 4   68    1    | 69  2  7 |  589    3    56   |
| 37  36    5    | 69  8  4 |  279    1    267  |
| 2   9   a(6)78 | 1   5  3 |  78     8-6  4    |
:----------------+----------+-------------------:
| 1   7     9    | 8   6  2 |  35     4    35   |
| 8   4     3    | 7   1  5 |  6      2    9    |
| 6   5     2    | 3   4  9 |  1      7    8    |
:----------------+----------+-------------------:
| 9   236  b46   | 24  7  8 |  23     5    1    |
| 37  238   78   | 5   9  1 |  4    c(6)8  2367 |
| 5   1    b478  | 24  3  6 | c278    9    27   |
'----------------'----------'-------------------'

(6)r3c3 = (64-8)r79c3 = (86)b9p75 => -6 r3c8; stte
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Code: Select all
   *             |    |               |    |    *
        *        |=()=|    /  _  \    |=()=|               *
            *    |    |   |-=( )=-|   |    |      *
     *                     \  ¯  /                   *   

"If one is to understand the great mystery, one must study all its aspects, not just the dogmatic narrow view of the Jedi."
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Re: April 19, 2019

Postby SpAce » Fri Apr 19, 2019 11:39 am

Leren wrote:(7=8) r8c3 - (8) r9c3 = r9c7 - r8c8 = (8-6) r3c8 = (6) r3c3 => - 78 r3c3; stte

Hmm. To me it seems that you'd only eliminate 7r3c3 with that chain. Right? How about something like:

(78)r89c3 = (48)r9c37 - r8c8 = (8,6)r3c83 => -78 r3c3; stte

Edit: added the comma for correctness.
Last edited by SpAce on Fri Apr 19, 2019 12:01 pm, edited 1 time in total.
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Re: April 19, 2019

Postby SteveG48 » Fri Apr 19, 2019 11:57 am

Code: Select all
 *-----------------------------------------------------------*
 | 4     8-6   1     | 69    2     7     | 589   3     56    |
 | 37    36    5     | 69    8     4     | 279   1     267   |
 | 2     9   ae678   | 1     5     3     | 78   d8-6   4     |
 *-------------------+-------------------+-------------------|
 | 1     7     9     | 8     6     2     | 35    4     35    |
 | 8     4     3     | 7     1     5     | 6     2     9     |
 | 6     5     2     | 3     4     9     | 1     7     8     |
 *-------------------+-------------------+-------------------|
 | 9     236   4-6   | 24    7     8     | 23    5     1     |
 | 37    238  a78    | 5     9     1     | 4    c68    2367  |
 | 5     1    a478   |b24    3     6     |c278   9    c27    |
 *-----------------------------------------------------------*


(6=478)r379c3 - (4=2)r9c4 - (2=678)b9p579 - 6r3c8 = 6r3c3 => -6 r1c2,r3c8,r7c3 ; stte
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Re: April 19, 2019

Postby SteveG48 » Fri Apr 19, 2019 12:04 pm

SpAce wrote:
Leren wrote:(7=8) r8c3 - (8) r9c3 = r9c7 - r8c8 = (8-6) r3c8 = (6) r3c3 => - 78 r3c3; stte

Hmm. To me it seems that you'd only eliminate 7r3c3 with that chain. Right? How about something like:

(78)r89c3 = (48)r9c37 - r8c8 = (8,6)r3c83 => -78 r3c3; stte

Edit: added the comma for correctness.


You're overlooking the chain within the chain : (8) r9c3 = r9c7 - r8c8 = (8-6) r3c8
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Re: April 19, 2019

Postby SpAce » Fri Apr 19, 2019 12:10 pm

SteveG48 wrote:You're overlooking the chain within the chain : (8) r9c3 = r9c7 - r8c8 = (8-6) r3c8

You're right! Thank you. I think such an intention should be clearly marked, however. Too bad there's no standard for that, but personally I use '@' to mark any embedded end points (last used here in Step 4). In a normally written AIC I only consider the actual ones, and I don't think anything else is a fair assumption. Anyhow, I don't think there's any need for such extensions here because the chain can be easily written normally with the (78)r89c3 node as the other end point (mine was just one example).
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Re: April 19, 2019

Postby Cenoman » Fri Apr 19, 2019 1:53 pm

Code: Select all
 +-------------------+-----------------+--------------------+
 |  4    68    1     |  69   2    7    |  589   3    56     |
 |  37   36    5     |  69   8    4    |  279   1    267    |
 |  2    9    c678*  |  1    5    3    | b78#   68*  4      |
 +-------------------+-----------------+--------------------+
 |  1    7     9     |  8    6    2    |  35    4    35     |
 |  8    4     3     |  7    1    5    |  6     2    9      |
 |  6    5     2     |  3    4    9    |  1     7    8      |
 +-------------------+-----------------+--------------------+
 |  9    236   46    |  24   7    8    |  23    5    1      |
 |  37   238  a8-7#  |  5    9    1    |  4     68*  2367   |
 |  5    1     478*  |  24   3    6    |  278*  9    27     |
 +-------------------+-----------------+--------------------+

In the 8s, 5-link oddagon (*) with two guardians:
(8)r8c3==(8-7)r3c7 = (7)r3c3 => -7 r8c3; ste
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Re: April 19, 2019

Postby Sudtyro2 » Fri Apr 19, 2019 9:00 pm

Code: Select all
+-----------------+---------------+----------------+
| 4    68    1    |  69  2   7    |  589  3   56   |
| 37   36    5    |  69  8   4    |  279  1   267  |
| 2    9    d678  |  1   5   3    |  78  e68  4    |
+-----------------+---------------+----------------+
| 1    7     9    |  8   6   2    |  35   4   35   |
| 8    4     3    |  7   1   5    |  6    2   9    |
| 6    5     2    |  3   4   9    |  1    7   8    |
+-----------------+---------------+----------------+
| 9    236  c46   | c24  7   8    |  23   5   1    |
| 37  g238  g78   |  5   9   1    |  4   f68  2367 |
| 5    1   ah78-4 | b24  3   6    | a278  9  a27   |
+-----------------+---------------+----------------+

Almost hidden triple...
HT(278)r9c379 = 2r9c4 - (2=46)r7c34 - r3c3 = r3c8 - (6=8)r8c8 - r8c23 = 8r9c3 => - 4r9c3; stte

ADDED:
There's also the complementary almost naked triple by simply reversing the above chain...
NT(278)r9c379 = 4r9c3 - 8r9c3 = ... - (64=2)r7c34 => - 2r9c4; stte

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