Finned X-Wing

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Finned X-Wing

Postby Wepwawet » Thu Apr 09, 2020 8:15 pm

Is there a way of representing this in Eureka notation.

I have a Finned X wing of 7's at r17c58, fin at r1c1, there is a chain from r1c1 to r7c5 that eliminates the 7 at r4c5 if the fin is a 7.

r1c1-7-r3c2=7=r3c8-7-r7c8=7=r7c5 >=r4c5<>7 and if the fin is not a 7, then r4c5<>7 because it would be a regular X-Wing. Now my question is, how is this represented in Eureka notation, an X-WIng with a chain leading from the fin that leads to an elimination. Is there a particular name for this scenario?

Thanks in advance.

Finned X Wing.png
Finned X Wing.png (19.86 KiB) Viewed 103 times
Last edited by Wepwawet on Thu Apr 09, 2020 10:30 pm, edited 1 time in total.
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Re: Finned X-Wing

Postby Leren » Thu Apr 09, 2020 9:22 pm

I'll try this a few ways. There were typos in your chain, which I've corrected :

1.
Code: Select all
  7 r1c1-7-r3c2=7=r3c8-7-r7c8=7=r7c5 > - 7 r4c5;

- 7 r1c1 =  [ XWing (7) r17c58 ]     > - 7 r4c5; => - 7 r4c5

2.
Code: Select all
*---------------------------------------------------*
|*67  8     3   | 4     *27     9   | 1  *267  5    |
| 16  5     19  | 278    238    37  | 26  4    2679 |
| 2  *79    4   | 1      5      6   | 3  *79   8    |
|---------------+-------------------+---------------|
| 4   267   8   | 267    236-7  5   | 9   236  1    |
|*17 *12679 129 |f26789  34689 f347 | 5   2368 26   |
| 3   269   5   | 2689   2689   1   | 7   268  4    |
|---------------+-------------------+---------------|
| 9   4     6   | 5     *17     2   | 8  *17   3    |
| 8   3     12  | 679    1469   47  | 26  5    2679 |
| 5   12    7   | 3      169    8   | 4   1269 269  |
*---------------------------------------------------*

Finned Jellyfish in 7's r1357 c1258 fin r5c46 => - 7 r4c5

3.
Code: Select all
*-------------------------------------------------*
| 67 8     3   | 4     27     9   | 1  267   5    |
| 16 5     19  |*278   238   *37  | 26 4    *2679 |
| 2  79    4   | 1     5      6   | 3  79    8    |
|--------------+------------------+---------------|
| 4  267   8   |*267   236-7  5   | 9  236   1    |
| 17 12679 129 |f26789 34689 f347 | 5  2368  26   |
| 3  269   5   | 2689  2689   1   | 7  268   4    |
|--------------+------------------+---------------|
| 9  4     6   | 5     17     2   | 8  17    3    |
| 8  3     12  |*679   1469  *47  | 26 5    *2679 |
| 5  12    7   | 3     169    8   | 4  1269  269  |
*-------------------------------------------------*

Finned Swordfish in 7's c469 r248 fin r5c46 => - 7 r4c5

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Re: Finned X-Wing

Postby Wepwawet » Thu Apr 09, 2020 10:36 pm

Thanks for pointing out my wrong row in the chain, should have proof-read it first - I have now corrected the wrong row number. I am not interested in other fish and solutions at this point - I would have come across them in due course. It was that I was just enquiring how to represent such a chain linking from the fin of a fish and wondering if there was such a term for this.

I am not convinced it is correct to just be succinct and state a particular value in a cell cannot be x in such a situation, without including the chain that proved the statement, more particularly, if you have a readership where one is trying to explain the rationale behind every step.

... edited to focus on the notation required to explain the conclusion
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