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Spaceship Discussion Thread

For discussion of specific patterns or specific families of patterns, both newly-discovered and well-known.

Re: Spaceship Discussion Thread

Postby Saka » March 2nd, 2017, 4:22 am

@A For Awesome
How did you find them? With jls?

EDIT:
Is this tagalong known?
x = 36, y = 17, rule = B3/S23
29bo$6bobo18b2obo$3bo4bo17bo$2b3o4bo9b2o4bo$bobo14b3o3b2obo4b4o$2o2b2o
4bo13b2ob3o3bo$b2o2b5o3bob2ob4o7b2obo$13bobo3bobob2o2b2o2bo$12bo4bobo$
13bobo3bobob2o2b2o2bo$b2o2b5o3bob2ob4o7b2obo$2o2b2o4bo13b2ob3o3bo$bobo
14b3o3b2obo4b4o$2b3o4bo9b2o4bo$3bo4bo17bo$6bobo18b2obo$29bo!


And this very sparky one?
x = 45, y = 17, rule = B3/S23
23b2o$6bobo9b3ob3o5bo9b2o$3bo4bo9bo2bobo5b3o4b2o2b3o$2b3o4bo8b4ob2o4b
3o2bobo2bo2b2o$bobo19bo2bo4b2o8bo2bo$2o2b2o4bo9bo2bo2b2o3b2obo2b3o2b2o
$b2o2b5o3bobo2bobo2bobo2bo7b2o2b3o$13bob2obo2bobob2ob4o5b5o$12bo5bo3b
2o$13bob2obo2bobob2ob4o5b5o$b2o2b5o3bobo2bobo2bobo2bo7b2o2b3o$2o2b2o4b
o9bo2bo2b2o3b2obo2b3o2b2o$bobo19bo2bo4b2o8bo2bo$2b3o4bo8b4ob2o4b3o2bob
o2bo2b2o$3bo4bo9bo2bobo5b3o4b2o2b3o$6bobo9b3ob3o5bo9b2o$23b2o!
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Re: Spaceship Discussion Thread

Postby Sokwe » March 2nd, 2017, 5:49 am

Saka wrote:Is this tagalong known?
And this very sparky one?

Yes, these are both known. In fact, all width-17 bilaterally symmetric period-5 2c/5 spaceships are "known", since I ran a complete knightt search at this width a few weeks ago. Here are the results:
knightt-2c5-w9-o.zip
(173.78 KiB) Downloaded 10 times
Every possible ship of this type can be constructed from the components in the attached file.

These ships were certainly found earlier than my knightt search. In fact, the first one can be found in jslife. The second ship was almost certainly found by Paul Tooke in early 2002. Paul fairly extensive 2c/5 searches up to a search width of 11, so you probably won't find much new stuff below that width.

By the way, I also ran the complete width-21 p5 2c/5 gutter search with knightt. Here are the results:
knightt-2c5-w10-g.zip
(1.5 MiB) Downloaded 8 times


Saka wrote:@A For Awesome
How did you find them? With jls?

He said that he used JLS for his c/4 and 2c/5 orthogonal searches, so he might still be using it for his c/4 diagonal searches. However, if you are running Windows, Nicolay's modification of WLS is better at searching for c/4 diagonal ships. A c/4 diagonal search in JLS and standard WLS will find large fields of gliders, but Nicolay's modification can detect when a spaceship is found, and will skip solutions that don't interact with that spaceship.

The best way to search for c/4 diagonal ships with Nicolay's WLS is to go to options->search settings, and in the box labeled "Ignore objects with a pop of up to", write "5".
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Re: Spaceship Discussion Thread

Postby Saka » March 2nd, 2017, 6:06 am

Sokwe wrote:
Saka wrote:Is this tagalong known?
And this very sparky one?

Yes, these are both known. In fact, all width-17 bilaterally symmetric period-5 2c/5 spaceships are "known", since I ran a complete knightt search at this width a few weeks ago. Here are the results:
knightt-2c5-w9-o.zip
Every possible ship of this type can be constructed from the components in the attached file.

These ships were certainly found earlier than my knightt search. In fact, the first one can be found in jslife. The second ship was almost certainly found by Paul Tooke in early 2002. Paul fairly extensive 2c/5 searches up to a search width of 11, so you probably won't find much new stuff below that width.

By the way, I also ran the complete width-21 p5 2c/5 gutter search with knightt. Here are the results:
knightt-2c5-w10-g.zip


Saka wrote:@A For Awesome
How did you find them? With jls?

He said that he used JLS for his c/4 and 2c/5 orthogonal searches, so he might still be using it for his c/4 diagonal searches. However, if you are running Windows, Nicolay's modification of WLS is better at searching for c/4 diagonal ships. A c/4 diagonal search in JLS and standard WLS will find large fields of gliders, but Nicolay's modification can detect when a spaceship is found, and will skip solutions that don't interact with that spaceship.

The best way to search for c/4 diagonal ships with Nicolay's WLS is to go to options->search settings, and in the box labeled "Ignore objects with a pop of up to", write "5".

1. Oh well... Back to 19 columns...
2. How do I do the sort for diagonals thing?
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Re: Spaceship Discussion Thread

Postby Sokwe » March 2nd, 2017, 7:02 am

Saka wrote:Oh well... Back to 19 columns...

As I said, Paul Tooke did fairly extensive searches up to a search width of 11. That corresponds to a full width of 21 for odd symmetric searches. Nobody has ever run a full knightt search at this width (it would take a very long time), but it's likely that most of the interesting stuff has been found. At width-23 there are more likely to be interesting new spaceships.

For long, thin 2c/5 ships, gfind and knightt are the best search programs. JLS and WLS are better for finding ships with "strange shapes" (this is what A For Awesome has been searching for).

Saka wrote:How do I do the sort for diagonals thing?

I'm guessing you want to know how to do a diagonal sort order for Nicolay's WLS. To do this, go to Options->Sort order. Under where it says "Direction 1" write "1" in the boxes labeled "cells right" and "cells down". For diagonal searches I also like to set the "sort center" to column 1, and row 1.

A word of warning when using Nicolay's WLS. For me, the program tends to crash after certain actions, such as saving or when I reset the search. As a result, I tend to save the search state before I start any search (even though saving crashes the program, it still saves the file). This way, if I want to change the search a little bit (since resetting often crashes the search), I can reload the initial state.
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Re: Spaceship Discussion Thread

Postby Saka » March 2nd, 2017, 7:09 am

all right I'll do W 23 with wls
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Re: Spaceship Discussion Thread

Postby A for awesome » March 2nd, 2017, 5:43 pm

Sokwe wrote:
Saka wrote:@A For Awesome
How did you find them? With jls?

He said that he used JLS for his c/4 and 2c/5 orthogonal searches, so he might still be using it for his c/4 diagonal searches. However, if you are running Windows, Nicolay's modification of WLS is better at searching for c/4 diagonal ships.

Neither. I'm running knight2 at width 12. Here are two more ships (nothing too interesting):
x = 12, y = 74, rule = B3/S23
4bo$2bo2bo$6bo$2bo2bo$6bo$4b2o$3bobo$4bo$3b2o$3bobo$6bo$6bo$4b3o2$bobo
3bo$2b2o4b2o$2bo5b2o$7bo2$4bo4bo$5b3ob2o$9b2o2$2bobobobo$3b6o$6b2o$bob
o$2b2o4bobo$9b2o$4bo4bo$2b2obo$2bo$3bo$3bobo$4b2o$4bo3$9bo$10bo$9b2o$
9bo$6bob2o$8bo$7bo$bo$bo5b3o$2b4obo2bo$4b2o3b2o$9b2o2$4bo3b2o$4bo2b3o$
4bob4o$8bo$3bo$7b2o$3bob3o$6bo2bobo$10b2o$obo2bobo2bo$b2o3bo$bo3b2o$3b
3o2bo$2b3o3bo$2b2o3bo$9bobo$4bo5b2o$2b2obo4bo$2bo$3bo$3bobo$4b2o$4bo!

By the way, I'm also currently running c/6 width 11 asymmetric on knightt. It's currently at #D 22 after ~200 CPU-hours, so it'll take a while. The p9 zfind searches from a while back I may have to restart or just give up on; one of them I accidentally killed partway through (I forgot to dump the state) but I have some partials saved, and the other one is still ostensibly running but I always leave my old computer closed and I doubt it'll ever finish unless I do something about it. I also just started (2,1)c/7 width 12 using knight2.

EDIT: I didn't even notice that I found this ship:
x = 12, y = 36, rule = B3/S23
6bo$6bo$6b2o$3bobo4bo$3bob2obobo$3bobo3b2o$b3o$4bo$b4obobo$8bo$obo5bo$
b2o$bo4bo2b2o$5bo3b2o$9bo$4bo5bo$3bo4b3o2$4b3o$6bo2$4bobo$o4b2o$b2o3bo
$2o5bo$4bo$4bo2bo$2b2o2b2o$bo7bo$10b2o$bo2bo4b2o$o3bo$bo2bo$4bo$2bob2o
$3b2o!


EDIT 2: I also just ran (3,1)c/9 width 9 with knight2. Longest partial:
..*.**
.**.*
.**..*..*
.**..*.**
..*...**
......*
...**.**
......*
.....**
...***
...**
...*
If the if becomes the the and the the becomes the becomes, and will become will and become will become if. Now, the I say something will I use becomes wrong words, it ifs something like this.

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Re: Spaceship Discussion Thread

Postby Sokwe » March 2nd, 2017, 11:14 pm

A for awesome wrote:I didn't even notice that I found this ship

A 60-cell ship and a 68-cell ship based on this:
x = 36, y = 28, rule = B3/S23
32bo$6bo24b2o$5b2o24bobo$5bobo$34b2o$8b2o24b2o$8b2o19b2o$29bo2b2o$6b2o
21bo3bo$5bo2bo21b2obo$4b2obo21bo3b2o$3o22b3o$o24bo5bo2bo$bo24bo$2o3bo
19b2o3bo$2o2bo4bo15b2o2bo4bo$8b2o23b2o$2bo5bobo16bo5bobo$2bo24bo$2bobo
b4o17bobob4o$6bo24bo$7b3o22b3o$2o3bobo17b2o3bobo$obob2obo17bobob2obo$o
4bobo17bo4bobo$3b2o23b2o$4bo24bo$4bo24bo!


A for awesome wrote:I also just ran (3,1)c/9 width 9 with knight2.

Unfortunately, according to this post, (3,x)c/9 doesn't work properly in knight2 for unexplained reasons. Tim Coe said he would post a fix, but he never did (he seems to have gotten distracted with developing knightt instead).

A for awesome wrote:I also just started (2,1)c/7 width 12 using knight2.

For knight2 searches, you should use the -t command which prints the entire search tree to where ever the output is being directed. You can then use the -i command to restart the search, or even split the search over multiple CPUs, although splitting the search requires some changes to the code.

We could potentially use this search splitting to do a distributed search in the same vein as this.
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Re: Spaceship Discussion Thread

Postby A for awesome » March 2nd, 2017, 11:33 pm

Unfortunately, (1,1)c/4 width 12 just stopped for unexplained reasons. I'll restart (2,1)c/7 width 12 via your suggestions, and give up on the (3,1)c/9 searches.
If the if becomes the the and the the becomes the becomes, and will become will and become will become if. Now, the I say something will I use becomes wrong words, it ifs something like this.

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Re: Spaceship Discussion Thread

Postby Sokwe » March 3rd, 2017, 12:32 am

A for awesome wrote:Unfortunately, (1,1)c/4 width 12 just stopped for unexplained reasons.

I would guess that it ran out of memory (there is a memory limit set in the code). What value are you setting the -d parameter to? Are you using -m 3? Tim Coe talked about these issues a bit here.

Edit: some new c/4 diagonal ships based on one of A for awesome's ships:
x = 36, y = 185, rule = B3/S23
13b2o$12b2obo$13bo$13bo2bo$13bo3bo$7b2o4bo2bo$6b2o$8bo7bo$10b2o2b2o$
10bo2bo$13bo$10bo5b2o$11bo3b2o$11b2o4bo2$7bob2o$6b4o$6bo3b2o$11bo2bo2$
10b2o3bo$10b2o3bo$11bo$11bo$12b2o16$13b2o$12b2obo$13bo$13bo2bo$13bo3bo
$7b2o4bo2bo$6b2o$8bo7bo$10b2o2b2o$10bo2bo$13bo$10bo5b2o$11bo3b2o$11b2o
4bo$6b2o$6bo2b2o$bo4bo3bo$2o5b2obo$obo3bo3b2o$4bo$3bo4bo2bo$3bo2bo19$
13b2o15b2o$12b2obo13b2obo$13bo16bo$13bo2bo13bo2bo$13bo3bo12bo3bo$7b2o
4bo2bo7b2o4bo2bo$6b2o15b2o$8bo7bo8bo7bo$10b2o2b2o11b2o2b2o$10bo2bo13bo
2bo$13bo16bo$10bo5b2o9bo5b2o$11bo3b2o11bo3b2o$11b2o4bo10b2o4bo2$7bob2o
13bob2o$6b4o13b4o$6bo3b2o11bo3b2o$11bo2bo13bo2bo2$10b2o4b2o9b2o5bo$10b
2o4bobo8b2o4b2o$11bo4bo11bo4bobo$11bo16bo$12b2o15b2o16$13b2o15b2o$12b
2obo13b2obo$13bo16bo$13bo2bo13bo2bo$13bo3bo12bo3bo$7b2o4bo2bo7b2o4bo2b
o$6b2o15b2o$8bo7bo8bo7bo$10b2o2b2o11b2o2b2o$10bo2bo13bo2bo$13bo16bo$
10bo5b2o9bo5b2o$11bo3b2o11bo3b2o$11b2o4bo10b2o4bo2$7bob2o13bob2o$6b4o
13b4o$6bo3b2o11bo3b2o$11bo2bo13bo2bo2$10b2o3bo11b2o4b2o$10b2o3bo11b2o
4bobo$11bo5b2o9bo4bo$11bo4b2o10bo3b2o$12b2o4bo10b2o16$13b2o$12b2obo$
13bo$13bo2bo$13bo3bo$7b2o4bo2bo$6b2o$8bo7bo$10b2o2b2o$10bo2bo$13bo$10b
o5b2o$11bo3b2o$11b2o4bo2$7bob2o$6b4o$6bo3b2o$11bo2bo$18bo$10b2o3bob2o$
10b2o3bobobo$11bo5bo$11bo6bo$12b2o!

There are clearly still a huge number of undiscovered c/4 diagonal ships up to 70 bits.
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Re: Spaceship Discussion Thread

Postby Saka » March 4th, 2017, 11:04 pm

Where do I download knight and knight2?
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Re: Spaceship Discussion Thread

Postby Sokwe » March 4th, 2017, 11:41 pm

Saka wrote:Where do I download knight and knight2?

Knight was never publically released, as far as I know. The knight2 discussion thread in the scripts forum has a link to Tim Coe's post with the source code for knight2. The source code for knightt can be found in the knight2 discussion thread here.
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Re: Spaceship Discussion Thread

Postby A for awesome » March 10th, 2017, 11:21 am

A pushalong to 2 c/6 waves:
x = 21, y = 114, rule = B3/S23
12b3o$11b5o$10bo5bo$11bob4o$12b3o$12b3o3$11bob2o$11b2o$11bo$11bo$11bob
2o$15bo$12bo$16bo$14bobo$8b3o$8b3o4bo$9b3ob2o$11bo$9bo$9bo2bo2$9b3o$9b
obo2$6bo7bo$4b2o9b2o$4bobo2b3o2bobo$5b3ob3ob3o$6bobo3bobo$5b2o7b2o$5b
2o7b2o$6bo7bo$4bobo7bobo$3bo13bo$4b3o7b3o$7bobobobo$7bobobobo$7bo5bo$
7bobobobo2$3b3o9b3o$6bo7bo$2bob4o5b4obo$b2obo11bob2o$2b3o11b3o$2b2o13b
2o$4bo11bo2$5b3o5b3o$4bo11bo$4bo11bo$5b4o3b4o$9bobo$8b2ob2o$3b2o3b2ob
2o3b2o$4b2o9b2o$3b2o2b2o3b2o2b2o$2bo4b2o3b2o4bo$6b2obobob2o$3b2o2bobob
obo2b2o$3b2o2bobobobo2b2o$3bobo9bobo$3b3o9b3o$5b3o5b3o2$5bo9bo$4bobo7b
obo$7bo5bo$4bobo7bobo$7bo5bo$6b3o3b3o$6b3o3b3o2$3b4o7b4o$2b6o5b6o$b8o
3b8o$2o6b2ob2o6b2o3$2bo4bo5bo4bo$2b2o2b2o5b2o2b2o3$3b4o7b4o$3bo2bo7bo
2bo$2bo4bo5bo4bo$3b4o7b4o$2b2o2b2o5b2o2b2o$3b4o7b4o$4b2o9b2o$3b4o7b4o$
2b6o5b6o$b8o3b8o$2o6b2ob2o6b2o3$2bo4bo5bo4bo$2b2o2b2o5b2o2b2o3$3b4o7b
4o$3bo2bo7bo2bo$2bo4bo5bo4bo$3b4o7b4o$2b2o2b2o5b2o2b2o$3b4o7b4o$4b2o9b
2o$3b4o7b4o$2b6o5b6o$b8o3b8o$2o6b2ob2o6b2o!
If the if becomes the the and the the becomes the becomes, and will become will and become will become if. Now, the I say something will I use becomes wrong words, it ifs something like this.

http://conwaylife.com/wiki/A_for_all

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Re: Spaceship Discussion Thread

Postby Sokwe » March 11th, 2017, 7:38 am

A for awesome wrote:A pushalong to 2 c/6 waves

It can be pushed by one of Tim Coe's ships:
x = 19, y = 132, rule = B3/S23
12bo$10bo3bo$10bo3bo$9bo5bo$10bo4bo$10bo$11bobo$12bo2$10bobo$9b2obo$9b
2o$9b2o$11bobo$11b3o2$14bo$8bo5bo$7bobo4bo$13bo$7bo2b2obo$8bob2o$9bo2$
8bobo$8bobo$8bobo2$4bo9bo$3bobo3bo3bobo$3bo2b3ob3o2bo2$7b5o2$6bo5bo$5b
2o5b2o$4bo9bo$2bo2bo7bo2bo$3b3o7b3o$4bobo5bobo$5b2o5b2o$5b2o5b2o$7bo3b
o$3bo11bo$3b2o9b2o$6bo5bo$2obob2o5b2obob2o$o4bo7bo4bo$3bo11bo$bo15bo$
2bo13bo$4b2o7b2o$4b2o7b2o$3bobo7bobo$3bob2o5b2obo$4b4o3b4o$5bo2bobo2bo
2$2b3o2b2ob2o2b3o$4bobobobobobo$2b6o3b6o$2bo5bobo5bo$2bo2bo2bobo2bo2bo
$2b3obobobobob3o$bo2b2o7b2o2bo$bo2b2o7b2o2bo$2bo13bo$4b2o7b2o$4bo9bo$
4bo9bo$4b2o7b2o$5b2o5b2o$5b2o5b2o$4bo2bo3bo2bo2$5bobo3bobo$9bo$b3o2b7o
2b3o$o4b9o4bo$bo15bo$bobobo7bobobo$7bo3bo$5b3o3b3o$5bobobobobo$7b2ob2o
$7bo3bo$8bobo$9bo2$7b2ob2o$7b2ob2o3$5b3o3b3o$5b2obobob2o$2bo5bobo5bo$
2bo3bobobobo3bo$2bo3bobobobo3bo$5b3o3b3o$5bo7bo$4b2o7b2o2$4b2obo3bob2o
$4b2ob2ob2ob2o$5bob2ob2obo$6b2o3b2o$7bo3bo$2b2o2bo5bo2b2o$2b2obob2ob2o
bob2o$2b3o2b2ob2o2b3o$7b2ob2o$2b2o3bo3bo3b2o$8bobo$6bobobobo$5b2obobob
2o$5bo2bobo2bo$4bo3bobo3bo$3bo3b2ob2o3bo$3bo3b2ob2o3bo$3bo4bobo4bo$2b
2o11b2o$2b2ob3o3b3ob2o$2b3o9b3o3$2b3o9b3o$5b2o5b2o$4b2o2b3o2b2o$b3o2b
2obob2o2b3o$9bo$8bobo$8bobo!


Here are some new c/4 diagonal ships:
x = 53, y = 252, rule = B3/S23
bo$2o$obo$2bo$3bo$ob2o$bo2$2b2o$2b2o4b2o$2bo4b2o$3b2o4bo$11b2o$3b3o4bo
$3bo2bo$4bobob2o2bo2$8bob2o2b2o$8bo2bob2o$11bo3bo$9b2o$11bo$9b3o$8b2o
2bo$10bo16$3o$o$bo$3o$3ob2o3$3bo$2b2o$2bo$3b3o2$3b2obo$3b2o$5bobo2$7b
3o$15bo$9bobob2obo$11bo2bobo$13b2o2$11b2o$11b2o5b2o$13bo3b2o$13b2o3bo$
12bo4b2o$13bo$12bo$13bo2bo$14bo10$3o$o$bo$3o$3ob2o3$3bo$2b2o$2bo$3b3o
2$3b2obo$3b2o$5bobo2$7b3o$15bo$9bobob2obo$11bo2bobo$13b2o2$11b2o$11b2o
$12bo$12bobo2$14bobo2$15bobo$15b2o$15bo2$12b2o2bo$12bo$12bo$13bo$13b2o
$13b2o12$3o$o2b3o$bobo$6bo$4bo$6bobo3b2o$9bo2bobo$6bo2bo2bo$6bo2bo$6bo
2bo$10b2o$7bo2b2o$11bobo$8b2o$8bo4bobo$9bo5bo$16bo$9b2o6bo$9bobo5bobo
2$19b2o$19bo$18b2o$19b2o2$16b2o$15b2o$16b2o$16b3o$16bo$17b2o10$3o$o2b
3o$bobo$6bo$4bo$6bobo$9bo$6bo2bo$5bo3bo$4b2o3bo$4bo4bo$3b2obobo$4bobob
o2b3o$4bo3bo4b2o$5b2o7bo$9b2ob4o$12b2o2$12bo$11bobo$10bo2bo$11bo$11bo
3bob3o$15bobo$12b2o5bo$14bo2b2o15$3o28bo$o2b3o24b2o$bobo26bobo$6bo25bo
$4bo28bo$6bobo3b2o16bob2o$9bo2bobo16bo$6bo2bo2bo$6bo2bo22b2o$6bo2bo22b
2o$10b2o20bo$7bo2b2o21b2o$11bobo$8b2o23b3o$8bo4bobo17bo2bo$9bo5bo18bo$
16bo19b2o$9b2o6bo20bo$9bobo5bobo19b2o3b2o$13b2o25bob3obo$13b2o4b2o19bo
$19bo23b3o$18b2o22b2o$19b2o20b2o$43bo$16b2o24bo$15b2o26bo$16b2o25bobo$
16b3o$16bo28b2o$17b2o26bo$44b2o$45b2o2$47bo$46bo2b2o$47bob2o$51bo$49bo
bo$49bo$50bobo$52bo!
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Re: Spaceship Discussion Thread

Postby A for awesome » March 12th, 2017, 12:53 pm

Another double c/6 wave pushalong:
x = 35, y = 130, rule = B3/S23
3$9b3o10b3o$4b3obo7b2o7bob3o$8bo3bo2bo2bo2bo3bo$8bo5bo4bo5bo$14b2o2b2o
$11bo3bo2bo3bo$11bobo6bobo$12b10o$14bo4bo$12bo8bo$11bo10bo$12bo8bo$14b
o4bo$15b4o$13b3o2b3o$11bo10bo$10b2o10b2o$8bo2bo2bo4bo2bo2bo$16b2o$9bob
o4b2o4bobo$12bo8bo$11b2o8b2o$11bobo6bobo$10bo2bo6bo2bo$10bo12bo$8b2o3b
o6bo3b2o$8b2o2bo8bo2b2o$9bob2o8b2obo$10bo12bo$10b3o8b3o2$10bo12bo$9bob
o10bobo$12bo8bo$9bobo10bobo$12bo8bo$11b3o6b3o$11b3o6b3o2$8b4o10b4o$7b
6o8b6o$6b8o6b8o$5b2o6b2o4b2o6b2o3$7bo4bo8bo4bo$7b2o2b2o8b2o2b2o3$8b4o
10b4o$8bo2bo10bo2bo$7bo4bo8bo4bo$8b4o10b4o$7b2o2b2o8b2o2b2o$8b4o10b4o$
9b2o12b2o$9b2o12b2o$8bo2bo10bo2bo$7bo4bo8bo4bo4$6bo6bo6bo6bo$5bobob2ob
obo4bobob2obobo$5b2o2b2o2b2o4b2o2b2o2b2o$9b2o12b2o2$7b2o2b2o8b2o2b2o$
7b2o2b2o8b2o2b2o$8b4o10b4o$8bo2bo10bo2bo$7bo4bo8bo4bo$7bo4bo8bo4bo$7bo
b2obo8bob2obo$8bo2bo10bo2bo$8bo2bo10bo2bo3$8bo2bo10bo2bo$8b4o10b4o$9b
2o12b2o4$6b8o6b8o$5bob6obo4bob6obo$5b3o4b3o4b3o4b3o$8bo2bo10bo2bo$7bo
4bo8bo4bo$7b2o2b2o8b2o2b2o3$7b2o2b2o8b2o2b2o2$6bo2b2o2bo6bo2b2o2bo$9b
2o12b2o$7b6o8b6o5$7b6o8b6o3$8b4o10b4o$7b6o8b6o$6b8o6b8o$5b2o6b2o4b2o6b
2o3$7bo4bo8bo4bo$7b2o2b2o8b2o2b2o3$8b4o10b4o$8bo2bo10bo2bo$7bo4bo8bo4b
o$8b4o10b4o$7b2o2b2o8b2o2b2o$8b4o10b4o$9b2o12b2o$9b2o12b2o$8bo2bo10bo
2bo$7bo4bo8bo4bo!


EDIT: Yet another:
x = 23, y = 195, rule = B3/S23
14bo$12bo3bo$12bo3bo$11bo5bo$12bo4bo$12bo$13bobo$14bo2$12bobo$11b2obo$
11b2o$11b2o$13bobo$13b3o2$16bo$10bo5bo$9bobo4bo$15bo$9bo2b2obo$10bob2o
$11bo2$10bobo$10bobo$10bobo2$6bo9bo$5bobo3bo3bobo$5bo2b3ob3o2bo2$9b5o
2$8bo5bo$7b2o5b2o$6bo9bo$4bo2bo7bo2bo$5b3o7b3o$6bobo5bobo$7b2o5b2o$7b
2o5b2o$9bo3bo$5bo11bo$5b2o9b2o$8bo5bo$2b2obob2o5b2obob2o$2bo4bo7bo4bo$
5bo11bo$3bo15bo$4bo13bo$6b2o7b2o$6b2o7b2o$5bobo7bobo$5bob2o5b2obo$6b4o
3b4o$7bo2bobo2bo2$4b3o2b2ob2o2b3o$6bobobobobobo$4b6o3b6o$4bo5bobo5bo$
4bo2bo2bobo2bo2bo$4b3obobobobob3o$3bo2b2o7b2o2bo$3bo2b2o7b2o2bo$4bo13b
o$6b2o7b2o$7bo7bo$8bo5bo$7bobo3bobo$7bobo3bobo$8bo5bo$8bo5bo$9bo3bo$9b
2ob2o$8b2o3b2o$7bobo3bobo$6b4o3b4o$5b4obobob4o$4b2o3b2ob2o3b2o$10bobo$
7b2obobob2o$7b3o3b3o$8bo5bo$6b3o5b3o$6b3o5b3o$6bo2bo3bo2bo3$3b3o11b3o$
4b2o11b2o$7b3o3b3o$7bo2bobo2bo$8bobobobo$8bobobobo$7b2obobob2o$7b2obob
ob2o$8bobobobo$9b2ob2o$8b2o3b2o$8bo5bo$9bo3bo$9b2ob2o$7bobo3bobo$6bo9b
o2$5bo3b2ob2o3bo$6b3o5b3o2$4b2o11b2o$2bo4bo7bo4bo$bo6bo5bo6bo$o8bo3bo
8bo$2ob4ob2o3b2ob4ob2o3$2b2o2b2o7b2o2b2o$2b2o2b2o7b2o2b2o2$4b2o11b2o$
3b4o9b4o$2b2o2b2o7b2o2b2o$2bo4bo7bo4bo$4b2o11b2o$2bo4bo7bo4bo$2bo4bo7b
o4bo2$3bo2bo9bo2bo$3b4o9b4o5$bo6bo5bo6bo$ob6obo3bob6obo$2o6b2o3b2o6b2o
$4b2o11b2o$3b4o9b4o$2b2o2b2o7b2o2b2o3$2b2o2b2o7b2o2b2o$2b2o2b2o7b2o2b
2o$b2o4b2o5b2o4b2o$2bob2obo7bob2obo$2b2o2b2o7b2o2b2o4$3bo2bo9bo2bo$3bo
2bo9bo2bo$3bo2bo9bo2bo3$2b6o7b6o$bo6bo5bo6bo$o8bo3bo8bo$o8bo3bo8bo$3bo
2bo9bo2bo$2bo4bo7bo4bo$2b2o2b2o7b2o2b2o4$2b6o7b6o$4b2o11b2o$2bo4bo7bo
4bo$3bo2bo9bo2bo$3b4o9b4o3$3b4o9b4o$3b4o9b4o$3b4o9b4o$4b2o11b2o$2bo4bo
7bo4bo$bo6bo5bo6bo$o8bo3bo8bo$2ob4ob2o3b2ob4ob2o3$2b2o2b2o7b2o2b2o$2b
2o2b2o7b2o2b2o2$4b2o11b2o$3b4o9b4o$2b2o2b2o7b2o2b2o$2bo4bo7bo4bo$4b2o
11b2o$2bo4bo7bo4bo$2bo4bo7bo4bo2$3bo2bo9bo2bo$3b4o9b4o!
If the if becomes the the and the the becomes the becomes, and will become will and become will become if. Now, the I say something will I use becomes wrong words, it ifs something like this.

http://conwaylife.com/wiki/A_for_all

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Re: Spaceship Discussion Thread

Postby Sokwe » March 13th, 2017, 5:51 am

A new 70-cell c/4 diagonal ship:
x = 22, y = 34, rule = B3/S23
18bo$17b2o$17bobo2$20b2o$19b3o$19bo2$15b2obobo$14bo5bo$13bo3b2o$12bo2b
o$12bo$14bo$12bobo$11bo$10b2o$10bo4bo$9b2obob2o$11bo2bo$9b2o3b2o$9b2o$
8bo2bo$9b2o$6b3o$6bo$6bob2o2$b2o4bo2bo$2o3b2o2bo$2bo3bo$4bo$4bo$5b2o!


@wildmyron
Did you ever end up running those width-17 odd and width-18 even symmetric c/8 searches?
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Re: Spaceship Discussion Thread

Postby BlinkerSpawn » March 13th, 2017, 10:44 am

Is there a close-to-up-to-date c/4d collection?
If there is, where can I find it?
LifeWiki: Like Wikipedia but with more spaceships. [citation needed]
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Re: Spaceship Discussion Thread

Postby Sokwe » March 13th, 2017, 12:45 pm

BlinkerSpawn wrote:Is there a close-to-up-to-date c/4d collection?
If there is, where can I find it?

This collection compiled by Nicolay Beluchenko contains all known c/4 diagonal spaceships up to 70 bits except for the few that have been mentioned in this topic.
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Re: Spaceship Discussion Thread

Postby A for awesome » March 13th, 2017, 6:18 pm

An unlikely but possible c/6 pushalong:
x = 18, y = 19, rule = B3/S23
4bo8bo$2bo3bo4bo3bo$2bo3bo4bo3bo$bo5bo2bo5bo$2bo4bo2bo4bo$2bo12bo$3bob
o6bobo$4bo8bo2$b2obo8bob2o$b2obo8bob2o$2o14b2o$2b3o8b3o$3bo2bo4bo2bo$
4bo8bo$6b2o2b2o$3bo2b2o2b2o2bo$3bo10bo$5b3o2b3o!
If the if becomes the the and the the becomes the becomes, and will become will and become will become if. Now, the I say something will I use becomes wrong words, it ifs something like this.

http://conwaylife.com/wiki/A_for_all

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Re: Spaceship Discussion Thread

Postby muzik » March 13th, 2017, 7:58 pm

Looks pretty promising tbh, just missing 4 bits/2 sparks
Image This jump is annoying. Let's fix it.

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Re: Spaceship Discussion Thread

Postby wildmyron » March 16th, 2017, 2:52 am

Sokwe wrote:@wildmyron
Did you ever end up running those width-17 odd and width-18 even symmetric c/8 searches?

I did, and coincidentally as of yesterday I have something to report. Neither of the searches completed before I lost access to the machine they were running on but I had resumed the width 17 odd search on my desktop recently and it completed yesterday with a negative result. Total CPU time ended up being about 25 days.

Here is a selection of partials from the search, I can't be sure that they're all new but there aren't any with width 15.
x = 857, y = 60, rule = B3/S23
4b2o5b2o33bo3bo34bo5bo33bo5bo33bo5bo33bo5bo33bo5bo32bo7bo31bo7bo30bo9b
o29bo9bo34bo39bo39bo39bo39bo39bo39bo39bo39bo39bo33bo11bo$2bo4bobo4bo
30bobobobo33b2o3b2o32b2o5b2o31bobo3bobo31bobo3bobo31bobo3bobo30bobo5bo
bo29bobo5bobo28bobo7bobo27bobo7bobo33bo39bo39bo39bo39bo39bo39bo39bo39b
o39bo33bo11bo$2bo4bobo4bo30bobobobo35bobo33bo2bo3bo2bo29bo2bo3bo2bo29b
o2bo3bo2bo30bobo3bobo33bo3bo32bobo5bobo233b3o37b3o37b3o37b3o37b3o37b3o
37b3o31b6o3b6o$bo5bobo5bo68bo2bobo2bo31bobo3bobo31b2o5b2o31b2o5b2o32bo
5bo29b4ob2ob2ob4o28bo7bo29b4o5b4o27b4o5b4o32bobo37bobo37bobo314bo2bobo
2bo$obo3b2ob2o3bobo25b6ob6o27b2obobobobob2o28bobo5bobo146bo2bob3ob3obo
2bo66b2obo3bob2o29b2obo3bob2o32bobobo35bobobo35bobobo313b2obobob2o$b4o
7b4o26bobo7bobo30bobobobo31b2o7b2o113bobo35bo5bo72bob2ob2obo31bob2ob2o
bo34bobo37bobo37bobo314b2obobob2o$2bob2o5b2obo28b2ob2ob2ob2o31bobobobo
31bobo5bobo31b3ob3o33b3ob3o34b2ob2o29b2ob2ob2ob2ob2ob2o25b3o3bo3b3o28b
2ob2ob2ob2o29b2ob2ob2ob2o29bo9bo111b7o33b7o33b7o33b7o33b7o33b7o33b7o
29bobobobobobobobo$3bobob3obobo31b3ob3o30b3ob2ob2ob3o29b2ob3ob2o30b2ob
o3bob2o29b2obo3bob2o28b2o2bo3bo2b2o30b2o3b2o28b3o2bob3obo2b3o106bo9bo
111bobobobo33bobobobo33bobobobo33bobobobo33bobobobo33bobobobo33bobobob
o28b2ob2o2bobo2b2ob2o$2b13o108bobo2bo2bobo28b2o2b2ob2o2b2o27b2o2b2ob2o
2b2o27b5o3b5o28bobo5bobo27bo2bobobobobo2bo29b2o3b2o33b2o3b2o29b2ob2o5b
2ob2o30bo3bo34bo5bo28b3o5bo5b3o23b3o5bo5b3o23b3o5bo5b3o23b3o5bo5b3o23b
3o5bo5b3o23b3o5bo5b3o23b3o5bo5b3o26b2obo3bob2o$3bo9bo108b2obo5bob2o30b
2o3b2o33b2o3b2o32b9o68bo2bob2ob2obo2bo27bo3bobo3bo30bo2bobo2bo35bo34bo
9bo31b2o3b2o28b2ob2o7b2ob2o23b2ob2o7b2ob2o23b2ob2o7b2ob2o23b2ob2o7b2ob
2o23b2ob2o7b2ob2o23b2ob2o7b2ob2o23b2ob2o7b2ob2o23b2o4bo3bo4b2o$5b3ob3o
29b2obo7bob2o27bo9bo28b2ob2o3b2ob2o30bo5bo33bo5bo30bo5bo5bo28bobo5bobo
31b2obob2o30bob3o3b3obo28b2obo3bob2o68bo2b2obob2o2bo29b2o5b2o28bob2o7b
2obo25bob2o7b2obo25bob2o7b2obo25bob2o7b2obo25bob2o7b2obo25bob2o7b2obo
25bob2o7b2obo29b2o3b2o$5b2o3b2o32b2o5b2o29bob2o5b2obo68b2o7b2o29b2o7b
2o30b2obobob2o73b5o31bo2b2o3b2o2bo28b2obo3bob2o34bo32b2o3b2ob2o3b2o30b
5o30b2o11b2o25b2o11b2o25b2o11b2o25b2o11b2o25b2o11b2o25b2o11b2o25b2o11b
2o28b2o5b2o$3b3o5b3o30b2o5b2o28bo13bo30bo3bo33b2o5b2o31b2o5b2o29bo5bo
5bo27b4o5b4o27bo2b7o2bo28bob2o3b2obo68b3o3bo3b3o26b2obob2ob2obob2o26b
2o3b3o3b2o308b2o7b2o$41b3obo5bob3o26bo3b2ob2o3bo27b3o7b3o26bo3b2o3b2o
3bo25bo3b2o3b2o3bo29b3ob3o29bo3b2o3b2o3bo26bobobo3bobobo71b2ob2o31b2ob
ob3obob2o27bobo2bobo2bobo27b2o4bo4b2o29b2o5b2o31b2o5b2o31b2o5b2o31b2o
5b2o31b2o5b2o31b2o5b2o31b2o5b2o$2bo3bo3bo3bo29b3o3b3o29bo4bobo4bo30bo
5bo30b5o3b5o27b5o3b5o26bobo3bobo3bobo30b2ob2o31bobob2ob2obobo32bobo72b
o3bo3bo3bo31b5o32b2o7b2o30bobo3bobo31bobo3bobo31bobo3bobo31bobo3bobo
31bobo3bobo31bobo3bobo31bobo3bobo29b2ob2obob2ob2o$b2o3bo3bo3b2o67bo3bo
bo3bo30b3obob3o29bo11bo27bo11bo27b2ob2o3b2ob2o26b2o3b2ob2o3b2o26b3o3bo
3b3o27bobo2bobo2bobo28b3o5b3o28b2o2b2ob2o2b2o28bo2bo3bo2bo28bobo7bobo
29bo2bobo2bo31bo2bobo2bo31bo2bobo2bo31bo2bobo2bo31bo2bobo2bo31bo2bobo
2bo31bo2bobo2bo29b2o3bobo3b2o$bo3bo5bo3bo29b3ob3o31b4o3b4o26bo15bo109b
o3bo34bobobobo31bo4bo4bo28bo2b7o2bo70bob3obo30bo11bo27bob2o5b2obo28bo
3bobo3bo29bo3bobo3bo29bo3bobo3bo29bo3bobo3bo29bo3bobo3bo29bo3bobo3bo
29bo3bobo3bo28b3o7b3o$bo13bo28b3o3b3o29bo11bo28bo9bo26b3o2b2o3b2o2b3o
23b3o2b2o3b2o2b3o24bo4bo3bo4bo29b3ob3o33bo2bo2bo30b2o9b2o29b2o5b2o29b
2obobobobob2o27b2o2bo3bo2b2o25bo3bo7bo3bo307b3o3b3o$bo13bo26bobo7bobo
26bobo9bobo24b2o5b3o5b2o27bo7bo31bo7bo28bo4bo3bo4bo26bo11bo27b2ob2o3b
2ob2o27b2o9b2o66bo3bo5bo3bo27bob2o3b2obo26bob2o9b2obo66bo9bo29bo9bo29b
o3bobo3bo29bo3bobo3bo32bo3bo32bo9bo$3b2obo3bob2o26b2o2b2o5b2o2b2o23b2o
13b2o25bo3bo3bo3bo27b2o9b2o27b2o9b2o27bo11bo26b2ob3o3b3ob2o26b2ob2o3b
2ob2o28bo9bo30b3o3b3o28b3obo5bob3o29b2o3b2o30b2o2b5o2b2o30bobobobo32bo
7bo31bo7bo31bo2bobo2bo31bo2bobo2bo29bo11bo29bobo3bobo33bo3bo$3bo2bo3bo
2bo26b2o3bo5bo3b2o24bo2bo7bo2bo27bo2bo3bo2bo29bo9bo29bo9bo29bobo5bobo
28bo4bobo4bo29b4ob4o30bobo5bobo29bob2o3b2obo27b2ob3o3b3ob2o24b2o13b2o
25b4o2bo2b4o31bo3bo32b2o2bobo2b2o29b2o2bobo2b2o30bo2bobo2bo31bo2bobo2b
o29bo2bo5bo2bo28bo9bo30bo2bobo2bo$2b2obo5bob2o26b5o5b5o25bo2bo7bo2bo
28bob2ob2obo30b3o5b3o29b3o5b3o28b2o2bo3bo2b2o28bob2o3b2obo33bobo37bobo
32b2o9b2o27bo3bo3bo3bo25bo2bo9bo2bo25b2obo2bo2bob2o27b3o7b3o31b2ob2o
35b2ob2o29bob3o2bobo2b3obo23bob3o2bobo2b3obo25bobobo3bobobo29b2o5b2o
32b2obob2o$bob2o7b2obo26bo3b2ob2o3bo30bo5bo31b2obo3bob2o31bo2bo2bo33bo
2bo2bo30b2ob2o3b2ob2o25b2obo3bobo3bob2o27bo7bo31bo2bobo2bo29b2o9b2o27b
ob2o5b2obo29bo7bo30bob2obob2obo28bob2o5b2obo30bobobobo33bobobobo28bo3b
3o3b3o3bo23bo3b3o3b3o3bo28b2o3b2o74bo3bo$bob2o2b3o2b2obo26bobob2ob2obo
bo27bobo7bobo69b9o31b9o32bobobobo31b3obobob3o32bo3bo30b2o2b2o3b2o2b2o
25b3o2bo3bo2b3o25bo13bo28bo7bo30b2o3bo3b2o29b2o7b2o28b4obobob4o27b4obo
bob4o29b2o5b2o31b2o5b2o28bo5bobo5bo65bo13bo$bobo9bobo27b2o7b2o70bobo3b
obo32bo5bo33bo5bo30b3o2bobo2b3o25bobo4bobo4bobo25bo3bo3bo3bo28bobo5bob
o28b2ob2o3b2ob2o26bo2bo7bo2bo25bo2bo7bo2bo27b2o2bobo2b2o32b2ob2o31bo2b
obobobo2bo27bo2bobobobo2bo26b2o11b2o25b2o11b2o25bo4b2ob2o4bo28b2o5b2o
27bob2o4bo4b2obo$4bo7bo29b2obo5bob2o29b2o5b2o31bobo3bobo34b3o37b3o37bo
bo36b2ob2o32bobo5bobo27b3obo5bob3o26b2ob2o3b2ob2o26bo2bo7bo2bo25bo13bo
27b2ob2ob2ob2o31b3ob3o33bobobobo35bobo32bob3o3b3obo27bob3o3b3obo26bo4b
2ob2o4bo27bo2b5o2bo26bobo2b3ob3o2bobo$5bo5bo30b3o7b3o28b2obo3bob2o33b
3o32b2obo2bo2bob2o27b2obo2bo2bob2o30bobobobo30bob2obobob2obo28bobo5bob
o27b4obo3bob4o29b2o3b2o30bob2o5b2obo26bo3bo5bo3bo27bo2bo3bo2bo30bo7bo
34bobo35bobobobo30b5o3b5o27b5o3b5o25b2o13b2o25b3o2b3o2b3o27bo11bo$3bo
2bo3bo2bo33b3o34bo7bo32bo2bo2bo30bo3b2ob2o3bo27bo3b2ob2o3bo27b2ob2o3b
2ob2o27bob2obobob2obo29bo7bo30bo9bo29bob2o3b2obo27b3obo5bob3o25bo2b2o
5b2o2bo26bob3o3b3obo28b2o7b2o29b3obobob3o30bo2bobo2bo30bo2bo3bo2bo29bo
2bo3bo2bo27b2o11b2o25bobo4bo4bobo29bo5bo$b2o2b2obob2o2b2o29bo5bo29bobo
2b2ob2o2bobo28bobobobobo29bobo7bobo27bobo7bobo29b3o3b3o30b2o2bobo2b2o
31b2o3b2o29b3obo5bob3o27bo9bo26b2o2bo2bobo2bo2b2o28bo5bo33bo5bo30bo11b
o26bo2bobo3bobo2bo28bo7bo29b2o2b2ob2o2b2o27b2o2b2ob2o2b2o26bo13bo25b2o
3bo3bo3b2o29b3ob3o$2b2obob3obob2o30bo5bo29bobobo5bobobo28b2o2bo2b2o29b
o11bo27bo11bo26b3ob2o3b2ob3o29b3ob3o32b3o3b3o31bo7bo29b2o3b3o3b2o29bob
obobobo28bobo9bobo26b2ob2o3b2ob2o26b2obo2bobo2bob2o24bo3bo7bo3bo29bo3b
o30b3o9b3o25b3o9b3o66bob2obobob2obo31b2ob2o$41bo2bo7bo2bo28b2o5b2o31bo
2bobo2bo29bo3b2ob2o3bo27bo3b2ob2o3bo31bo3bo30b2o2b7o2b2o25b2o3bo3bo3b
2o67bobob3obobo29bo4bo4bo26b2ob4o3b4ob2o29b2ob2o30b2o11b2o25bo3bo5bo3b
o27bo9bo27bo2bo7bo2bo25bo2bo7bo2bo26bobo7bobo27bobo7bobo29bo7bo$2bo5bo
5bo27bobob2ob2obobo29b2o5b2o35bo34bo2b2ob2o2bo29bo2b2ob2o2bo69bobo5bob
o26bob2o3bobo3b2obo25bo11bo27b2o4bo4b2o25b2o3b2o3b2o3b2o23b2o2bo2bobo
2bo2b2o26bo9bo26b3ob3o3b3ob3o25b2o2bo3bo2b2o27b2o3bobo3b2o26bo2b4ob4o
2bo25bo2b4ob4o2bo26b3ob2ob2ob3o26bobob2o3b2obobo27b2o3bo3b2o$bo3bobobo
bo3bo27bob2obob2obo33bobo33b2o7b2o31b2o3b2o33b2o3b2o70bob2o5b2obo25bo
6bobo6bo108bob3obo32bo7bo29bo5bo5bo25bo2b2o2bobo2b2o2bo28b2o3b2o31bo2b
2ob2o2bo27bo13bo25bo13bo25b2o2bobobobo2b2o24bo3b9o3bo29bobobo$bobobo5b
obobo25bo5b3o5bo26bob2o5b2obo29bo2b3o2bo149b3o7b3o27b4obobob4o67bo2b2o
3b2o2bo65b2o3b2obob2o3b2o25bobob5obobo26b2o11b2o27b3o5b3o71b2o3b2o33b
2o3b2o34bo3bo33b2o2bo2b2o28bo4bobobo4bo$2bo2bo5bo2bo25bo3bo2bobo2bo3bo
26bo9bo29b3o2bo2b3o28b3o7b3o27b3o7b3o67bob9obo28b2ob2ob2ob2o68bo4bobo
4bo66b2o5bo5b2o25bo2b2o5b2o2bo26b2o9b2o27bo3bo3bo3bo28b4o3b4o29bob2o3b
2obo29bob2o3b2obo$7b3o31b4o2b3o2b4o28bo2bobo2bo29bobo7bobo26bo3bo5bo3b
o27bo2bo3bo2bo71b2o3b2o30bo4b3o4bo66b2o11b2o65b5o2bo2b5o25b3ob3ob3ob3o
26bobo7bobo26bo2b3o3b3o2bo26bob2obobob2obo30b2o3b2o33b2o3b2o31b2obo3bo
b2o$2b5o3b5o30bo5bo29bo13bo26b2o9b2o26b3obobobobob3o25bobobobobobobobo
66bobo7bobo27b2o9b2o65bob5o3b5obo104b2o2bo2bo2bo2b2o27b3obobob3o27b2ob
o2bobo2bob2o25b2o2b2o3b2o2b2o26b3o7b3o27b3o7b3o28bo3bobo3bo$b2o2bo5bo
2b2o27bobo5bobo27b2o3b2ob2o3b2o25b2o4b3o4b2o26b2obo5bob2o25b2obo2bo3bo
2bob2o64bo2b2ob3ob2o2bo26bobo2bobo2bobo65bo5bo3bo5bo104b2o3bo3bo3b2o
30bo3bo34b7o30bo3b2ob2o3bo27bobobo3bobobo30bo5bo29bobobobobobobobo$bo
13bo66bobob2ob2obobo69bobo3bobo27b2obo9bob2o106b2o3bo3b2o67bobo2b2ob2o
2bobo106b2o2bo3bo2b2o68b2ob2ob2ob2o29b2o2bobo2b2o28b3o7b3o25bo3bo7bo3b
o23b3ob2obobob2ob3o$3bo2bo3bo2bo28bo3b2ob2o3bo28b2o2bobo2b2o107bo3b2o
3b2o3bo107b2o3bo3b2o69bo9bo107b2o2b3ob3o2b2o29b2o3b2o30bo3b2ob2o3bo27b
o3bo3bo3bo32bobo30bo6bobo6bo23b3ob3o3b3ob3o$2o2b3obob3o2b2o25b4o5b4o
28bobobobobobo28b4o5b4o26bobobo5bobobo31bobo111bobo9bobo71bobo111bo4bo
3bo4bo26bob3o3b3obo26bo6bo6bo25bo13bo26b3obobobob3o26b3o2bo3bo2b3o26bo
bo7bobo$4b9o27b2o5b3o5b2o24b2o11b2o25b4ob2ob2ob4o25b4obo3bob4o25b2o11b
2o104bo5b5o5bo225bo2bo5bo2bo27b2o9b2o26bo3bo5bo3bo26b2obo2bo2bob2o26b
2o2b2o3b2o2b2o24b5obo3bob5o$2bo11bo25b2ob2obo3bob2ob2o27bo2bobo2bo31bo
b2ob2obo28b2ob3o3b3ob2o26bobo7bobo112b3o232bobo7bobo28bo9bo27b2ob2o2bo
2b2ob2o29b2o3b2o34bo3bo$83b2obo3bob2o28bo4bobo4bo29bo2bobo2bo31bobobob
obo107bo2bo3b3o3bo2bo225bo2b2o3b2o2bo27bo4bobo4bo30bob3obo29bo2bo3bo3b
o2bo29bobobobo35bobo$82bobo3bo3bobo26bo2bobo3bobo2bo28b3obob3o31bo2bob
o2bo107bob2o9b2obo225bobobo3bobobo26bobo2b2ob2o2bobo25bobobo5bobobo24b
o5b2ob2o5bo28b2o3b2o34bo3bo$81bo5bobo5bo24bob2o2bobobo2b2obo25b2o9b2o
149bo3bo3bo231bob2ob2obo27bo3bo2b3o2bo3bo28bo5bo28bo2b2obo3bob2o2bo23b
ob5o3b5obo25b3ob2ob2ob3o$121bo13bo26bo2bo5bo2bo26b3o4bo4b3o105bo2b2obo
bob2o2bo269bo2bo2bo29bo3b2obob2o3bo29bob3obo28bo5bo3bo5bo29bo3bo$120bo
4b7o4bo24b2o11b2o25b2o3b5o3b2o105bob2o7b2obo306b2o9b2o25b2o4b5o4b2o25b
o3b5o3bo29b2o5b2o$126bobobo30b2ob2o5b2ob2o24bo2bob2o3b2obo2bo106b3obob
ob3o308bobo2bobo2bobo28b2obo3bob2o27b2o2bob3obo2b2o$160bo3b4ob4o3bo
466b3o2bo2b3o26b2o3b2obob2o3b2o25bo11bo28b2o7b2o$203bo9bo109b2ob2ob2ob
2o307bobob7obobo25b3o3b3o3b3o26bo3b5o3bo27bobo2b3o2bobo$202b2ob3ob3ob
2o108b2obo3bob2o348b3obo3bob3o26bo13bo24b2o6bo6b2o$206bo3bo109b3obo2b
3o2bob3o344bo3bob3obo3bo28bo7bo27b3obobo3bobob3o$205bo2bo2bo114bo3bo
351bo3bo3bo3bo26bo6bo6bo25b2o2b2o3b2o2b2o$201b3o3b3o3b3o108b3o3b3o352b
obobobo29bob2o3bo3b2obo25b3o9b3o$200b2ob2obo3bob2ob2o105bo11bo346b3obo
bobobob3o25bo5bobo5bo27b2obo3bob2o$321b4obo3bob4o426bobob2ob2obobo$
762bobo2b3o2bobo$768bo$761b2o3b2ob2o3b2o!


The second last one features a push-along - here it is with the longest width 17 partial I was able to find which supports it.
x = 96, y = 43, rule = B3/S23
7bo39bo$6b3o37b3o$6b3o37b3o$6b3o37b3o$4bobobobo33bobobobo$4bo5bo33bo5b
o$4bo5bo33bo5bo$o5b3o5bo25bo5b3o5bo$3o9b3o25b3o9b3o$ob2o7b2obo25bob2o
7b2obo$b2o9b2o27b2o9b2o$b3o7b3o27b3o7b3o$3b2o5b2o31b2o5b2o$3bo7bo31bo
7bo$4bo5bo33bo5bo$2bo2b2ob2o2bo29bo2b2ob2o2bo$bo3bo3bo3bo27bo3bo3bo3bo
$2bo2bo3bo2bo29bo2bo3bo2bo$4bo5bo33bo5bo$3bo7bo31bo7bo$3b2o5b2o31b2o5b
2o3$43bobo3bobo31bobo3bobo$43b2o5b2o31b2o5b2o$41b2obo5bob2o27b2obo5bob
2o$41bo3b5o3bo27bo3b5o3bo$40bo2b9o2bo25bo2b9o2bo$40b3o9b3o25b3o9b3o$
42b2ob2ob2ob2o29b2ob2ob2ob2o$45b2ob2o35b2ob2o$43bobo3bobo31bobo3bobo$
39b2o2bo2bobo2bo2b2o23b2o2bo2bobo2bo2b2o$42bo2bo3bo2bo29bo2bo3bo2bo$
40b2o5bo5b2o25b2o5bo5b2o$41bo4bobo4bo27bo4bobo4bo$44bo5bo33bo5bo$42bob
2o3b2obo29bob2o3b2obo$41b2o2b2ob2o2b2o27b2o2b2ob2o2b2o$41bo3b5o3bo27bo
3b5o3bo$41bobo7bobo27bobo7bobo$45b5o35b5o$42b2o7b2o29b2o7b2o!


I've kicked off the continuation of the even search too, hopefully won't be too much longer.

Edit:
The width 9 even symmetric search completed with no results. The total CPU time was approximately 22 days.

Search: zfind-s-p8-k1-w9 v l4000

A selection of partials:
x = 658, y = 54, rule = B3/S23
3b2o8b2o28b2o8b2o29b2o6b2o31bo6bo32bo6bo32bo6bo31bo8bo30bo8bo34b2o38b
2o38b2o33bo10bo28bo10bo28bo10bo28bo10bo27bo12bo26bo12bo$bo4bo4bo4bo25b
4o6b4o27bo2bo4bo2bo30b2o4b2o32b2o4b2o32b2o4b2o30bobo6bobo28bobo6bobo
33b2o37bo2bo36bo2bo30bo3bo6bo3bo26b2o8b2o27bobo8bobo26bobo8bobo25bobo
10bobo24bobo10bobo$bo4bo4bo4bo24b4obo4bob4o25bo4bo2bo4bo27bo2bo4bo2bo
28bo2bo4bo2bo28bo2bo4bo2bo31bo4bo30bo2bo6bo2bo30bob2obo30b3o2bo2bo2b3o
26b3o2bo2bo2b3o24bo4bo6bo4bo24b2obo6bob2o26bobo8bobo26bobo8bobo25bobo
10bobo24bobo10bobo$o2bo2bo4bo2bo2bo22b2o4b2o2b2o4b2o26bo2b4o2bo27b2o
12b2o24b2o12b2o24b2o12b2o24b4ob2o2b2ob4o26b2o8b2o29b2o6b2o28b2obo6bob
2o26b2obo6bob2o24b2obo2bo4bo2bob2o26b3o4b3o29bo10bo28bo10bo27bo5b2o5bo
26bo12bo$5b2o4b2o32b2o4b2o28bo4b2o2b2o4bo24b2o12b2o24b2o12b2o24b2o12b
2o23bo2bob3o2b3obo2bo30b2o34b2o6b2o28bo2b2o4b2o2bo26bo2b2o4b2o2bo64b2o
3b2o4b2o3b2o109bo2bo$4b2o6b2o32bo4bo29bobo2b2o2b2o2bobo24b2o2bo6bo2b2o
24b2o2bo6bo2b2o24b2o2bo6bo2b2o28bo6bo33b2o2b2o31b2o8b2o28bo10bo28bo10b
o32bo2bo29b2o4bo4bo4b2o25bo10bo73b2o$5bobo2bobo30bo2bo4bo2bo26bobo10bo
bo25b4o6b4o26b4o6b4o26b4o6b4o24b2ob2ob2o2b2ob2ob2o28bo4bo31bobo6bobo
30bo6bo32bo6bo29b2obobo2bobob2o25bo4b2o2b2o4bo25bobo8bobo26b3o8b3o26b
4o6b4o25b3o10b3o$5bob4obo30b2ob2o2b2ob2o26bo2bo8bo2bo26b12o28b12o28b
12o30b2o4b2o33bo4bo33bo6bo31bo2bo2bo2bo30bo2bo2bo2bo28bobo8bobo65bo3bo
6bo3bo26bo10bo26bob4o4b4obo25bobo8bobo$46b2o2b2o28b2ob3o6b3ob2o26bo2bo
2bo2bo30bo2bo2bo2bo30bo2bo2bo2bo29bobo6bobo30b8o29bo12bo27bo10bo28bo
10bo25b2o14b2o27bo6bo29bo12bo25bob2o8b2obo30b4o31bobo8bobo$5b2o4b2o33b
o4bo33bo6bo32bob4obo32bob4obo32bob4obo71b4o2b4o31b2o4b2o30b2ob2o2b2ob
2o28b2ob2o2b2ob2o25bo2bob3o2b3obo2bo27b8o29bobo8bobo24b3o12b3o23bobobo
2b2o2bobobo25bob2o6b2obo$42bo12bo68b2ob4ob2o30b2ob4ob2o30b2ob4ob2o28bo
12bo27bo2bo4bo2bo27b2o10b2o26b4o6b4o26b4o6b4o25bo5bo2bo5bo28b2o4b2o30b
2o2bo2bo2b2o67b2o3b4o3b2o26b2o2bo4bo2b2o$2b3o8b3o29bob4obo31b2o6b2o
147bobob2o4b2obobo25bo3bo4bo3bo64b3o12b3o22b3o12b3o28b2o2b2o35b4o34b2o
4b2o29b2o10b2o27bo3bo2bo3bo28bobo6bobo$2b2ob2o4b2ob2o26b2o10b2o25bo14b
o26bo10bo28bo10bo28bo10bo28bob2o4b2obo28bo2bo4bo2bo31bo4bo111bo2b2o2b
2o2bo32bo2bo35bo4bo32bo8bo30bo2bo2bo2bo31b2o4b2o$bo14bo26bo10bo27b2o
10b2o26bo12bo26bo12bo26bo12bo26bo4bo2bo4bo106bo12bo26bo12bo25bobob3o2b
3obobo26b2ob2o2b2ob2o27bo12bo70b2o2b2o32b2o6b2o$3b5o2b5o72bo2bo30b2o5b
2o5b2o24b2o5b2o5b2o24b2o5b2o5b2o27b4o2b4o69b2ob2o2b2ob2o105bo2bob2o4b
2obo2bo24bo2bo6bo2bo25b2o12b2o25bo3bo4bo3bo30bob2obo32b3o4b3o$3b2o8b2o
27b5o4b5o27bo3bo2bo3bo25bo6b4o6bo22bo6b4o6bo22bo6b4o6bo26bo2bo2bo2bo
29b3o6b3o28b2ob2o2b2ob2o26bo2b2o6b2o2bo23bo3b2o6b2o3bo23bo2b2o6b2o2bo
26b2o8b2o27bo12bo28b2obo2bob2o32b6o30bo4bo2bo4bo$8b2o31b2o4b4o4b2o25bo
3bo4bo3bo30b6o34b6o34b6o29bobobo6bobobo67bobo4bobo30b2o6b2o26bo3b2o6b
2o3bo23bo2bo3b2o3bo2bo25bo12bo27b2o8b2o29bo2bo2bo2bo32bo4bo29bo2b4o2b
4o2bo$6b6o30bobobo4bobobo27b3o6b3o25bobo12bobo22bobo12bobo22bobo12bobo
23b2o3b2o2b2o3b2o67b2o6b2o28bo12bo28bobo4bobo28bobo3b2o3bobo25b3obobo
2bobob3o26b2ob6ob2o29b2o6b2o32bo4bo28bo3bob2o2b2obo3bo$4b2o6b2o29b4o4b
4o65bobo12bobo22bobo12bobo22bobo12bobo23b3o10b3o27bo8bo28b3o8b3o26b3o
8b3o29bo6bo28b2o5b2o5b2o23b2obo2bo4bo2bob2o22bobo12bobo29bo2bo31bo12bo
24bo2bo2b6o2bo2bo$2bobo8bobo106bo5b2o5bo26bo5b2o5bo26bo5b2o5bo27bobo6b
obo28b3o6b3o68b2o8b2o26b3o10b3o26bo3b4o3bo25b2ob2o8b2ob2o25bo10bo29bo
2bo2bo2bo27bob3o6b3obo$3obo8bob3o25bo10bo30b2o4b2o27b2o3bob4obo3b2o22b
2o3bob4obo3b2o22b2o3bob4obo3b2o64b2ob3o2b3ob2o25bo14bo28bo6bo28b2o12b
2o25bo3bo4bo3bo27b2o8b2o25bob2o10b2obo30b2o72bo12bo$5bo6bo30bo10bo28b
3o6b3o29bob2o2b2obo30bob2o2b2obo30bob2o2b2obo29b3o6b3o27bobo2bo2bo2bob
o25bo4bob2obo4bo28bo6bo29b2o10b2o26b3o8b3o29b2o4b2o32bobo2bobo31bo2bo
2bo2bo30bo8bo28b2o10b2o$6b6o30bo2b2o4b2o2bo26b3o3b2o3b3o27bo3bo2bo3bo
28bo3bo2bo3bo28bo3bo2bo3bo68b2o3b2o3b2o26b2obob6obob2o29bo4bo30b5o4b5o
31b4o30b4o2bo2bo2b4o28bo2b2o2bo31b2o6b2o27bo2bo2bo2bo2bo2bo24bo14bo$5b
2o4b2o29b2o3b4o3b2o27b2o2bo2bo2b2o29bobo4bobo30bobo4bobo30bobo4bobo31b
o6bo34bo2bo33bo8bo30b3o4b3o32bo4bo28b3o2bobo2bobo2b3o23b3o3b4o3b3o27bo
8bo71b2o4b2o29b2o10b2o$3b3o6b3o28b2o8b2o30bo2b2o2bo33bo4bo34bo4bo34bo
4bo34bob2obo31bo3b4o3bo29bo8bo29bobo6bobo27bo12bo25b2o3b2o2b2o3b2o23bo
2bo2bo4bo2bo2bo30b2o71bo3b2o4b2o3bo29b2o2b2o$2b2o2b2o2b2o2b2o67bo2bo4b
o2bo28b3o6b3o28b3o6b3o28b3o6b3o28b2obo4bob2o68b3o6b3o28bobo6bobo26bo4b
o4bo4bo25bo3b2o2b2o3bo25b2o5b2o5b2o26b2o8b2o28b2ob2o2b2ob2o26b2o12b2o
26bo10bo$bo2bo8bo2bo23b2o3bo6bo3b2o24bo4bo2bo4bo27bo10bo28bo10bo28bo
10bo30bob4obo30bo2bo4bo2bo67bobo8bobo24b2o5bo2bo5b2o22bob2ob2o4b2ob2ob
o26bo3b2o3bo28bo3b2o2b2o3bo27b3o2b2o2b3o26b2o12b2o29bo4bo$3b2o8b2o25b
2obob2o4b2obob2o24bobo8bobo27b2o8b2o28b2o8b2o28b2o8b2o69b3o4b3o29b3o6b
3o27b3o8b3o27b2obo4bob2o29b2ob4ob2o30b2o6b2o28b2obo6bob2o28bo3b2o3bo
27b2ob2o6b2ob2o26b2o8b2o$bo3b2o4b2o3bo26bo2bo4bo2bo27bo3b2o2b2o3bo27bo
10bo28bo10bo28bo10bo68bo10bo28b3ob4ob3o27b3o8b3o30bo4bo70b2o2bob2obo2b
2o27bob2ob2ob2obo31b2o2b2o34bo4bo30b3o8b3o$bo4b6o4bo26bo10bo31b2o2b2o
149b3ob3o2b3ob3o27bo8bo30b2o2b2o2b2o29bo2bo4bo2bo25b2o14b2o26b3o4b3o
27bob5o2b5obo30bo2bo31bobo8bobo65bo4bo4bo4bo$2b2o4b2o4b2o25b2o2bobo2bo
bo2b2o26b3o6b3o27b2o10b2o26b2o3b4o3b2o26b2o2b2o2b2o2b2o27bobo6bobo29bo
8bo29b3o2b2o2b3o29b2o6b2o32bo4bo30b3o3b2o3b3o25bobo10bobo30b4o32b2o2bo
2bo2b2o29bobo4bobo27bo2bobo4bobo2bo$41bobo3bo2bo3bobo24bobobo6bobobo
28b3o2b3o32b2o4b2o34b4o29bo2b2o2bo2bo2b2o2bo66bo8bo30bobo4bobo28b3obo
4bob3o25bo2b2ob4ob2o2bo25b2o10b2o25b3o3bo2bo3b3o27bo3b2o3bo32b2o2b2o
34bob2obo$41bo4bo4bo4bo24bobo10bobo24bo4b2o2b2o4bo27b2o6b2o29bo4b2o4bo
69b2o6b2o34b2o33bob2ob2ob2obo26b2o3bo4bo3b2o66bo2bo4bo2bo26b2obobo4bob
ob2o31b2o36b2o2b2o30b2o2b6o2b2o$43bobo2b2o2bobo26bo2bo3b2o3bo2bo24bo
14bo27b2obo2bob2o29b3o6b3o67bo4bo2bo4bo25b2o3b2o2b2o3b2o24b3o2b6o2b3o
25bo3bo4bo3bo65b2ob3o4b3ob2o24b2obobo4bobob2o24bob2o8b2obo24b2o4b4o4b
2o25bo4bo2bo4bo$84b2obo2bob2o29bo10bo31bo4bo35b4o71b3o8b3o65bo4bob2obo
4bo25b2obo6bob2o64bo2bo4b2o4bo2bo26bo8bo26bo3b3ob2ob3o3bo24b2o2bo4bo2b
2o30b2o2b2o$82bo12bo24bob3o8b3obo65bo3b4o3bo67bobob2o2b2obobo65b3o10b
3o25b3o8b3o66bobo8bobo26bo3bob2obo3bo25bobo3bo2bo3bobo25b2ob2o4b2ob2o
27bob2ob2ob2obo$81b3ob2ob2ob2ob3o24bo2bo8bo2bo25b2o3b4o3b2o28bo8bo67b
2o2bo6bo2b2o67b3o4b3o33b4o69b2ob4o4b4ob2o24b2o3bo2bo3b2o25bo2b2obo2bob
2o2bo25b2ob2ob2ob2ob2o29bo2b2o2bo$81b2o2bo6bo2b2o27b2o2b2o2b2o28b2o2bo
4bo2b2o31bo2bo69bo2bo10bo2bo63b6o4b6o29bo4bo69bo6b2o6bo24b3o3bo2bo3b3o
23b2obob2o4b2obob2o23bo5b4o5bo25bo12bo$85bo6bo29b3o2bo2bo2b3o25bobo3bo
2bo3bobo25bo12bo64bobo12bobo63bo5bo2bo5bo24bo3b2ob2ob2o3bo63bo5bob2obo
5bo22b2o2bobo4bobo2b2o28bo4bo29b2o2bo2b2o2bo2b2o25b5o4b5o$121b2o4b4o4b
2o25bo4bo2bo4bo25bob4o4b4obo144b3o3bo2bo3b3o143b2o3b8o3b2o64bo4bo2bo4b
o25bo2b2ob4ob2o2bo$120bo3b3o4b3o3bo25bo2b2o2b2o2bo29b3o4b3o66bob2ob2o
4b2ob2obo65bo3bo2bo3bo185b2obo3bo2bo3bob2o24bob2o6b2obo24bo3bo3b2o3bo
3bo$120bo2b2o2bo2bo2b2o2bo23bo2b4o2b4o2bo26bo2bo4bo2bo66bo3b2o4b2o3bo
67bo8bo187b2ob2obo2bob2ob2o24b2obo8bob2o24bo2b2ob4ob2o2bo$161bo2bo8bo
2bo26bob3o2b3obo71b2o2b2o76b2o191b2o3b2o2b2o3b2o24b3o10b3o25bob2obo2bo
b2obo$162bobob2o2b2obobo31bo2bo74b3o2b3o72b2ob2ob2o187b2o4b6o4b2o25bo
2b2o2b2o2bo$166b2o2b2o29b2ob2o6b2ob2o64b3o3bo2bo3b3o65b5o4b5o184bob3o
8b3obo23bo4bob2obo4bo24bo3b3o2b3o3bo$162b3obo4bob3o29b2o4b2o67bo3bo3b
2o3bo3bo63bobo3bo2bo3bobo227bo8bo27b3o10b3o$161b2o2b2o4b2o2b2o23bo2bob
o6bobo2bo70b2o70bo2bo3bo2bo3bo2bo223b2o12b2o26b3obo2bob3o$161b2obo2bo
2bo2bob2o23bo16bo65bo3bo2bo3bo66bo14bo264b2o4bo2bo4b2o$168b2o34bobo4bo
bo67b2o4bo2bo4b2o67b10o$200bobo12bobo62bobo4bo2bo4bobo64bo4b4o4bo$201b
ob5o2b5obo68b3o2b3o68bo3bo6bo3bo$206b2o2b2o68bo5bo4bo5bo63bobobo6bobob
o$281bob3obo2bob3obo65bo12bo$360b2ob3o6b3ob2o!


I've excluded most of the partials containing the double loaf pusher as I posted a lot more of them earlier in this thread. It's hard to say if any of these are more promising that the rest, but if I had to guess I'd say the frontend of the tenth and eleventh partials looks kind of promising.
Last edited by wildmyron on March 19th, 2017, 11:15 pm, edited 1 time in total.
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Re: Spaceship Discussion Thread

Postby Sokwe » March 16th, 2017, 4:59 am

wildmyron wrote:
Sokwe wrote:@wildmyron
Did you ever end up running those width-17 odd and width-18 even symmetric c/8 searches?

I did, and coincidentally as of yesterday I have something to report. Neither of the searches completed before I lost access to the machine they were running on but I had resumed the width 17 odd search on my desktop recently and it completed yesterday with a negative result. Total CPU time ended up being about 25 days.

Since there are no (1,0)c/7 ships up to a search-width of 9, it wouldn't be surprising if there are no (1,0)c/8 ships at this width either. I suppose I can still hope for the width-18 even-symmetric ship.

I noticed that many of the known high-period ships only display their full width in a small number of rows. The new c/7 is width-19 in only 4 rows. The first width-19 c/6 was only width-19 in 7 rows, and I later found one that was width-19 in only 2 rows. It might therefore be useful to modify zfind to allow a small fixed number of full-width rows, while operating the rest of the search at the smaller width. Hopefully, such a search wouldn't take too much longer than a standard search at the lower width. I'll work on this modification over the next couple of weeks.

I have a farther-off plan of rewriting zfind as a breadth-first search with depth-first pruning, similar to gfind. I also plan to use openMP for distributing the depth-first pruning. This is a more ambitious endeavor than simple zfind modifications, so I don't plan to start it for at least a couple of months.
-Matthias Merzenich
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Re: Spaceship Discussion Thread

Postby wildmyron » March 19th, 2017, 11:49 pm

Sokwe wrote:
wildmyron wrote:
Sokwe wrote:@wildmyron
Did you ever end up running those width-17 odd and width-18 even symmetric c/8 searches?

I did, and coincidentally as of yesterday I have something to report. Neither of the searches completed before I lost access to the machine they were running on but I had resumed the width 17 odd search on my desktop recently and it completed yesterday with a negative result. Total CPU time ended up being about 25 days.

Since there are no (1,0)c/7 ships up to a search-width of 9, it wouldn't be surprising if there are no (1,0)c/8 ships at this width either. I suppose I can still hope for the width-18 even-symmetric ship.

The even width-18 search with zfind-s finished over the weekend. Alas, it too found no spaceships at that search width. I have updated the post above with a selection of partials to keep the width-17 odd and width-18 even results together.

Sokwe wrote:I noticed that many of the known high-period ships only display their full width in a small number of rows. The new c/7 is width-19 in only 4 rows. The first width-19 c/6 was only width-19 in 7 rows, and I later found one that was width-19 in only 2 rows. It might therefore be useful to modify zfind to allow a small fixed number of full-width rows, while operating the rest of the search at the smaller width. Hopefully, such a search wouldn't take too much longer than a standard search at the lower width. I'll work on this modification over the next couple of weeks.

This is an interesting idea to explore. Do you have some method in mind for determining which rows will be allowed to be at the full width? I suppose the limit of this idea is allowing an attempt at widening the current search state after every row when the current search state does not yet include a row of the full width. Whilst such a search will be faster than the complete full width search, I'm not sure that it "won't take too much longer than a standard search at the lower width" - like the ships with small full-width sections, there is a significant fraction of the search space which only has a small number of rows at the full width.

Another thought: Will the full-width portion be required to be contiguous? If not, you could constrain the search with a maximum number of full width rows and they would be allowed to occur anywhere in the current search state. Once the limit was reached all further rows would be constrained to the lower width.

I fear I'm at risk of bike-shedding here - I should just bide my time and look forward to the results instead of muddying the waters (and not go off-topic for this thread).

Sokwe wrote:I have a farther-off plan of rewriting zfind as a breadth-first search with depth-first pruning, similar to gfind. I also plan to use openMP for distributing the depth-first pruning. This is a more ambitious endeavor than simple zfind modifications, so I don't plan to start it for at least a couple of months.

I sure am looking forward to this development. I suspect it will deliver a significant step change in the performance of spaceship search programs.
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Re: Spaceship Discussion Thread

Postby Sokwe » March 20th, 2017, 2:16 am

wildmyron wrote:The even width-18 search with zfind-s finished over the weekend. Alas, it too found no spaceships at that search width.

https://www.youtube.com/watch?v=cdEQmpVIE4A

wildmyron wrote:This is an interesting idea to explore. Do you have some method in mind for determining which rows will be allowed to be at the full width?

I have a few ideas I want to test out. My first thought was simply to allow only a certain number of rows to be full-width and allow them to occur anywhere in the spaceship. Another idea is to have parameters that say a full-width row must occur by row N and no full-width rows can occur after row N.

wildmyron wrote:Whilst such a search will be faster than the complete full width search, I'm not sure that it "won't take too much longer than a standard search at the lower width" - like the ships with small full-width sections, there is a significant fraction of the search space which only has a small number of rows at the full width.

This is a good point. It's hard to know how these modifications will affect search length, and their purpose is for searches that are already reaching the edge of what is possible in a reasonable amount of time. A combination of the modifications described above may be necessary to get reasonable search lengths.

wildmyron wrote:Will the full-width portion be required to be contiguous? If not, you could constrain the search with a maximum number of full width rows and they would be allowed to occur anywhere in the current search state. Once the limit was reached all further rows would be constrained to the lower width.

This is how I first envisioned the modification.

wildmyron wrote:
Sokwe wrote:I have a farther-off plan of rewriting zfind as a breadth-first search with depth-first pruning, similar to gfind. I also plan to use openMP for distributing the depth-first pruning. This is a more ambitious endeavor than simple zfind modifications, so I don't plan to start it for at least a couple of months.

I sure am looking forward to this development. I suspect it will deliver a significant step change in the performance of spaceship search programs.

This has been my plan ever since I figured out that zfind works basically the same as gfind. I've noticed from running gfind that most of the time is taken in the depth-first stage.

gfind works as a breadth-first search with a limited queue size. Once the queue fills up, it takes each element (which represents a particular partial result), and tries to extend it to a specified depth. If it reaches that depth, the element is kept, but if no extension is found then the element is thrown away. Once it has gone through the whole queue, it repacks the remaining nodes of the search tree to save space and goes back to the breadth-first search.

It should be simple to split the depth-first portion among multiple processors. Just give each processor an element of the queue to check. A bit of care must be taken to avoid false sharing and potentially other issues. I don't have much knowledge of computer architecture or parallel computing, so if anyone has suggestions on what to watch out for, I would like to hear them.

Of course, the breadth-first portion can be split too, but that's a bit more complicated. I'll stick with the easiest implementation to begin with.

Other possibilities that I have no plans for at the moment:
  • Distributed computing: parts of the breadth-first search queue could be sent out to multiple computers to perform the depth-first pruning. Besides just being a lot of work, I don't know enough about networks to do this.
  • GPU computing: since zfind uses large lookup tables to find successive rows, I'm not sure if a GPU version could easily be written. gfind doesn't rely on large lookup tables, so it might work better. I might be completely wrong here, since I know very little about GPU programming.
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Re: Spaceship Discussion Thread

Postby Ethanagor » March 21st, 2017, 7:28 pm

I may or may not have just discovered a new spaceship. I checked through the wiki and couldn't find it, but tell me if this is already a thing. It is speed 2c/20 and orthogonal. Here is the RLE:
x = 0, y = 0, rule = B3/S23-a4ei6
4bo3b2o$3b3o3b2o$2bobo3b2o$3obo3bo!


If it is new, I am thinking of naming it either the arrowhead, flaming arrow, or fireball. But seeing as I am a relative novice at cellular automata in general, this is probably not new.

~Thanks!
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Re: Spaceship Discussion Thread

Postby drc » March 21st, 2017, 7:35 pm

Ethanagor wrote:I may or may not have just discovered a new spaceship. I checked through the wiki and couldn't find it, but tell me if this is already a thing. It is speed 2c/20 and orthogonal. Here is the RLE:

That ship is already known, other rules aren't on the wiki, and it's not in life.
--Daniel R. Collazo

LIFE IS AWESOME, XRLJ RV B█JV.ZJ, PTXT T█ D!T█!TT, P█PX █X HXXXXXX, PPPP PPAPPQPQPP, PQQP PQBPP█P█QQ, SRQAP█DPPUQTSSA, █XSBP█IPP█R███B, LIFE IS AWESOME
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