[B38/S23] Four-directional glider gun

[DivusIulius]

I want to see some investigation done into the rules B38/S23 [...] the fact that the switch engine (unfortunately) is completely unstable in them. But he, where the switch engine fails, a new type of pattern may succeed. But we will never know unless we look.

Four-directional glider gun... and most probably already discovered...

Code: Select all

x = 11, y = 2, rule = B38/S23
b2o4bo2bo$2o2b3ob3o!

[DivusIulius]

A more canonical version of the pattern... but, as I said previously... this is probably a rediscovery.

Code: Select all

x = 11, y = 18, rule = B38/S23
8b2o$8b2o2$5bo$5bo$4bobo$5bo$4b3o3$2b2o3b2o$2obo3bob2o$o9bo$obo5bobo$b
2ob3ob2o$3bo3bo$3bo3bo$4b3o!

[dvgrn]

A more canonical version of the pattern... but, as I said previously... this is probably a rediscovery.

That's an unusually nice p424 alien gun! Completely unsupported, and with several 11- and 12-cell seed patterns; it spends an unusually long time with a very low population count.

I can't find anywhere that this has been mentioned, but you might check with Jason Summers. It's not in his list of rules with B3 that have known guns, so there's at least a fair chance that this is a new discovery.

Here's a minimal eater-bounded version, starting from the 11-cell seed:

Code: Select all

x = 44, y = 44, rule = B38/S23
33b2o$33bo$31bobo$31b2o6$o$3o$3bo$2b2o8$18b2o$17bo4bo$17bo4bo$18bo3bo$
19b3o7$40b2o$40bo$41b3o$43bo6$11b2o$10bobo$10bo$9b2o!

[DivusIulius]

That's an unusually nice p424 alien gun! Completely unsupported, and with several 11- and 12-cell seed patterns; it spends an unusually long time with a very low population count.

I can't find anywhere that this has been mentioned, but you might check with Jason Summers.

Superb job, dvgrn! I was trying to isolate the minimum cell-count version of the active galactic nucleus unsuccessfully.

[DivusIulius]

It's not in his list of rules with B3 that have known guns, so there's at least a fair chance that this is a new discovery.

I found a succinct reference to the existence of known guns in B38/S23 here.

[dvgrn]

I found a succinct reference to the existence of known guns in B38/S23 here.

Ah, but you can't infer anything from that about anyone's previous knowledge of The Great P424 Pulsating Rotating Galactic Nucleus Gun.

Gosper's old p30 gun works just fine in B38/S23, after all -- I bet that's what the wiki article is referring to.

I'm thinking there must be seed patterns with <=10 cells, since there are so many promising <=12-cell patterns that could be run through WLS/JLS. (With a great effort of will, I'm reluctantly leaving that investigation as an exercise for the reader.)

[Sokwe]

As far as I know, the gun referred to by the wiki page is the Gosper glider gun. The information on the wiki page is based on the guns in Jason Summers' alien guns collection (see here). I believe this gun is new. I have found a few guns in rules not included in the alien guns collection, which I haven't posted anywhere, but I'll post them later today.

Also, I'm moving this topic to the "other cellular automata" forum.

[DivusIulius]

Also, I'm moving this topic to the "other cellular automata" forum.

Thanks, my fault.

[DivusIulius]

The information on the wiki page is based on the guns in Jason Summers' alien guns collection (see here). I believe this gun is new.

Finally the four-directional gun is b_3____8s__23_____.lif of file alienguns.zip as stated in this thread.