November 26, 2016

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November 26, 2016

Postby ArkieTech » Sat Nov 26, 2016 12:24 am

Code: Select all
 *-----------*
 |4..|.7.|..5|
 |..7|...|2..|
 |...|.8.|974|
 |---+---+---|
 |..6|3..|75.|
 |...|9.6|...|
 |.23|..5|4..|
 |---+---+---|
 |169|...|...|
 |..5|...|1..|
 |3..|.5.|..8|
 *-----------*


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dan
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Re: November 26, 2016

Postby SteveG48 » Sat Nov 26, 2016 12:36 am

Code: Select all
 *-----------------------------------------------------------*
 | 4     19    8     | 126   7     129   | 3     1-6   5     |
 | 56    1359  7     | 1456  69    1349  | 2     8    d16    |
 | 256   135   12    | 156   8     13    | 9     7     4     |
 *-------------------+-------------------+-------------------|
 | 9     14    6     | 3     24    8     | 7     5    d12    |
 | 57    57   b14    | 9     24    6     | 8    c123  c123   |
 | 8     2     3     | 7     1     5     | 4    a69    9-6   |
 *-------------------+-------------------+-------------------|
 | 1     6     9     | 8     3     247   | 5     24    27    |
 | 27    8     5     | 246   69    2479  | 1     2349  2379  |
 | 3     47   b24    | 12    5     1279  | 6    a29    8     |
 *-----------------------------------------------------------*


(6=29)r69c8 - (2=14)r59c3 - (1=23)r5c89 - (2=16)r24c9 => -6 r1c8,r6c9 ; stte
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Re: November 26, 2016

Postby Leren » Sat Nov 26, 2016 12:52 am

Code: Select all
*--------------------------------------------------------------*
| 4     19    8      | 126   7     129    | 3    d16    5      |
| 56    1359  7      | 1456  69    1349   | 2     8     16     |
| 256   135  b12     | 156   8     13     | 9     7     4      |
|--------------------+--------------------+--------------------|
| 9     14    6      | 3     24    8      | 7     5     12     |
| 57    57   a14     | 9     24    6      | 8     23-1  123    |
| 8     2     3      | 7     1     5      | 4    d69    69     |
|--------------------+--------------------+--------------------|
| 1     6     9      | 8     3     247    | 5     24    27     |
| 27    8     5      | 246   69    2479   | 1     2349  2379   |
| 3     47   c24     | 12    5     1279   | 6    d29    8      |
*--------------------------------------------------------------*

(1) r5c3 = (1-2) r3c3 = (2) r9c3 - (2=1) r169c8 => - 1 r5c8; stte

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Re: November 26, 2016

Postby pjb » Sat Nov 26, 2016 7:46 am

Code: Select all
 4       19      8      | 126    7      129    | 3     a16     5     
 56      1359    7      | 1456   69     1349   | 2      8      16     
 256     135     12     | 156    8      13     | 9      7      4     
------------------------+----------------------+---------------------
 9       14      6      | 3      24     8      | 7      5      12     
 57      57     c14     | 9      24     6      | 8      123    123   
 8       2       3      | 7      1      5      | 4     a69     69     
------------------------+----------------------+---------------------
 1       6       9      | 8      3      247    | 5      24     27     
 27      8       5      | 246    69     2479   | 1      2349   2379   
 3       47     b24     | 12     5      1279   | 6     a29     8     

(1=2)r169c8 - (2=4)r9c3 - (4=1)r5c3 => -1 r5c8; stte
close to Leren's, so
(6=2)6r9c8 - (2=1)r59c3 - r5c8 = r1c8; -6 r1c8; stte

Phil
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Re: November 26, 2016

Postby Ngisa » Sat Nov 26, 2016 8:46 am

Code: Select all
+-------------+--------------+-------------+
| 4   19   8  | 126  7  129  | 3 16   5    |
| 56  1359 7  | 1456 69 1349 | 2 8    f16   |
| 256 135  12 | 156  8  13   | 9 7    4    |
+-------------+--------------+-------------+
| 9   d14   6  | 3    24 8    | 7 5    e12   |
| 57  57   c14 | 9    24 6    | 8 123  123  |
| 8   2    3  | 7    1  5    | 4 6-9   g69   |
+-------------+--------------+-------------+
| 1   6    9  | 8    3  247  | 5 24   27   |
| 27  8    5  | 246  69 2479 | 1 2349 23-79 |
| 3   47   b24 | 12   5  1279 | 6 a29   8    |
+-------------+--------------+-------------+

(9=2)r9c8 - (2=4)r9c3 - (4=1)r5c3 - r4c2 = r4c9 - (1=6)r2c9 - (6=9)r6c9 => - 9 r6c9,r8c9; stte

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Re: November 26, 2016

Postby Cenoman » Sat Nov 26, 2016 2:56 pm

Code: Select all
 +-------------------+--------------------+--------------------+
 | 4     19     8    | 126    7    129    | 3   b16     5      |
 | 56    1359   7    | 1456   69   1349   | 2    8      16     |
 | 256   135    12   | 156    8    13     | 9    7      4      |
 +-------------------+--------------------+--------------------+
 | 9     14     6    | 3      24   8      | 7    5      12     |
 | 57    57    a14   | 9      24   6      | 8    23-1   123    |
 | 8     2      3    | 7      1    5      | 4   b69     69     |
 +-------------------+--------------------+--------------------+
 | 1     6      9    | 8      3    247    | 5    24     27     |
 | 27    8      5    | 246    69   2479   | 1    2349   2379   |
 | 3     47    a24   | 12     5    1279   | 6   b29     8      |
 +-------------------+--------------------+--------------------+

ALS-xy (14=2)r59c3 - (2=691)r169c8 =>-1 r5c8; stte
or XY chain (1=4)r5c3 - (4=2)r9c3 - (2=9)r9c8 - (9=6)r6c8 - (6=1)r1c8 =>-1 r5c8

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Re: November 26, 2016

Postby Leren » Sat Nov 26, 2016 7:31 pm

Cenoman wrote : ALS-xy (14=2)r59c3 - (2=691)r169c8 =>-1 r5c8

For historical reasons, when only two ALS's are involved in an ALS chain, the move is referred to as an ALS=XZ Rule.

So here I would write ALS XZ Rule: X = 2, Z = 1: (1=2) r59c3 - (2=1) r169c8 => - 1 r5c8

Also some pedants argue that if all the cells in both ALS's are bi-value cells then the move is also an XY chain and should be written that way, so your second formulation is the more "correct" one (for pedants :D ).

If there are 3 ALS's in an ALS chain, then it's called and ALS XY Wing. Any more than 3 then I would just call it an ALS chain and be done with it, with the caveat that at least one cell must contain more than 2 candidates.

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Re: November 26, 2016

Postby Cenoman » Sun Nov 27, 2016 10:36 pm

Leren wrote:
...when only two ALS's are involved in an ALS chain, the move is referred to as an ALS=XZ Rule
If there are 3 ALS's in an ALS chain, then it's called and ALS XY Wing. Any more than 3 then I would just call it an ALS chain

I take note of these way to refer to ALS chains, and will avoid to misuse ALS XY (that I wrongfully took as synonymous of ALS chain).

Leren wrote:
...so your second formulation is the more "correct" one (for pedants

I apologize if my writing the XY chain variant looked pedantic. I make no claims to give anyone lessons.

Best regards, Cenoman.
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Re: November 26, 2016

Postby Leren » Mon Nov 28, 2016 1:29 am

Cenoman wote : I apologize if my writing the XY chain variant looked pedantic.

You have no need to apologize for anything. What I was saying that was in the past other people (the pedantic ones) said that if an ALS chain consisted entirely of bi-value cells, it should always be written as an XY chain as opposed to an ALS chain.

It's quite common for grand passions to be excited by style (naming conventions and notation) as opposed to substance (whether or not an elimination has been proved or not).

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