NewLifeCA Back Issues
NewLifeCA Back Issues
Background
The reason I did this was that it had become clear that quite a few long-standing LifeCA members were still interested in current developments in Conway's Life, but had never managed to switch over to paying attention to the conwaylife.com forums or to Discord. Possibly this was because the signal-to-noise ratio was a lot higher on LifeCA; on conwaylife.com and Discord, without some practice, it can be difficult to sort through the noise to find the interesting stuff.
There's definitely a generational pattern here: almost everyone who was active on LifeCA in the 1990s and early 2000s opted to join the NewLifeCA email group, whereas no one opted in who had joined LifeCA from the mid-2000s onward. Many of these later additions to LifeCA are currently active on the forums and Discord -- they probably don't see any particular point in an old-fashioned email newsletter, and/or they don't actually use email enough to have noticed my opt-in message!
From 2010-2020, the great majority of the posts on LifeCA were news-summary posts, with few or no responses. This was nothing like the extended discussions that had happened regularly from 1992-2009, but it still served a purpose. In 2021, with LifeCA shut down, there was nowhere to send those kinds of news summaries... and when I asked around, I found that many people from the group hadn't heard anything at all about recent news -- Pattern of the Year entries, or the Unique Father problem getting solved, or the completion of the Conway's Life textbook.
Purpose
This will be a locked thread used only for an online archive of any NewLifeCA emails I send out. I've created a separate NewLifeCA discussion thread in case anyone wants to add comments there.
These news items are written for an audience that may or may not be keeping up with all the latest developments on conwaylife.com or Discord -- so I tend to include a bit more background and explanatory links and so on, than I would in a regular discussion thread.
It seems useful to have a public archive of NewLifeCA emails, partly so that it's easy for anyone to check back and see what they may have missed, and partly so that there won't be any particular reason why anyone else needs to join the NewLifeCA email group! (It's already rather awkwardly large, currently about thirty email addresses.) All the same messages will be available here, going forward -- and posts here can be linked and LifeViewer-enabled and so forth.
How to Subscribe
The modern equivalent of having your email address added to the NewLifeCA list is to click the "Subscribe topic" option under "Topic Tools" at the bottom of this page. You'll get a notification email every time something new is posted here.
Re: NewLifeCA Back Issues
On February 8, 2022, Dave Greene wrote: NewLifeCA 8 Feb 2022: Conway's Life News Emails, But Only If You Opt In
Hello! This is Dave Greene with a one-time group message related to the old LifeCA mailing list. You were in the database for the LifeCA Yahoo group at the time of its rather sudden demise at the end of 2020 -- so this email is going to you and to all of the eighty-odd other email addresses in that group.
For the past year and change, I haven't had anywhere to send occasional Life news updates -- and recently it has come to my attention that news isn't getting around to all of you ex-LifeCA folks. For example, several people recently turned out to be unaware that a Conway's Life textbook was being written, let alone that it has now been completed.
There's been quite a surge of other news recently, including solutions in January 2022 to the Grand^N Orphan problem and the Unique Father problem -- and the completion of a period-38 oscillator, leaving only two or three missing periods to make Life provably omniperiodic. 2021 saw a wide variety of discoveries, from new spaceship syntheses and new true-gun periods, to SMOSes and RROs (q.v.) and even a new quadratic-growth replicator. Details can be found as usual in the LifeWiki news archive.
Opt-In Needed
A large fraction of these emails from the LifeCA group are probably defunct at this point, and more people may not want to receive further LifeCA email. So... NO FURTHER MESSAGES WILL BE SENT TO THIS EMAIL LIST.
If you don't want to be contacted again at this address, you don't have to do anything. To be added to a new LifeCA replacement mailing list -- let's call it "NewLifeCA" -- please be sure to reply to this email, saying at least "opt in".
It is currently an open question exactly what form the NewLifeCA mailing list will take. Please feel free to make suggestions in your response.
It might be nice to have a system that allowed for discussions between group members, similar to the LifeCA group, without everyone having to know (or being able to see) everyone else's address -- but for that to work I think we'd need some new volunteer moderators.
Meanwhile, the only things that I am volunteering to do for the moment are
1) compile a new list of freshly opted-in NewLifeCA email addresses;
2) send Conway's Life news occasionally to the resulting NewLifeCA group;
3) forward any messages to the NewLifeCA group that are sent to me at b3s23life (at) gmail specifically to be distributed to the list.
... And I'll only do that last job until it becomes tedious. In the (probably unlikely) event that NewLifeCA gets a lot of traffic in the long run, that will be a sign that it's time to find a better communication method.
However, for most discussion topics, there's no need to re-invent the wheel: a very good option is to start a new thread on the forums.
Again, please reply to opt in to be part of the NewLifeCA group, and/or to weigh in on a discussion of what the best options are for a LifeCA successor group going forward.
Re: NewLifeCA Back Issues
On February 11, 2022, Dave Greene wrote: NewLifeCA 11 Feb 2022: a new 35P12H6V0 (plus friends-and-relations)
Very recent news: the old Schick engine suddenly has some competition!
Until yesterday, the smallest known period-12 spaceship was the 39-cell LWSS-on-LWSS version of the Schick engine.
On Thursday morning, February 10, a relative newcomer to the ConwayLife Lounge on Discord (handle is "mystical", showed up on the Discord server last April) found a 35-cell period-12 ship using a hacked version of apgsearch.
(Presumably this means that the program was adjusted to create lots of hopeful combinations of c/2 front ends, then run through apgsearch's census code to see if anything came out that wasn't already known.)
The new spaceship can reflect gliders --
-- and it can be turned into a period-36 spaceship using known pufferfish technologyCode: Select all
x = 32, y = 13, rule = B3/S23 bo$b2o$obo$24bo$23b3o4bo$18bo3b2obo3b3o$17b3o2b3o3b2obo$7b2o8bob2ob3o 3b3o$8b2o12b3o3b3o$7bo20b3o$25b3ob2o$20bo5bo$20bo4bo!
More details along these lines can be found here.Code: Select all
#C see https://conwaylife.com/wiki/Pufferfish_spaceship for #C where the high-period c/2 tagalong technology comes from x = 28, y = 32, rule = B3/S23 5b3o11b3o$4bo2bo10bo2bo3b3o$7bo5b3o5bo2bo2bo$3bo3bo5bo2bo4bo5bo$3bo3bo 4bo3bo4bobo3bo$7bo4bo8bobo3bo$4bobo6bobo4bo6bo$24bobo$17bobo$5b3o10bo$ 5bo2bo$4bo2b2o2b2o$3b3o5b2o$3bo$3b2o13bo$4bo12b3o$17bob2o$18b3o$8bo9b 3o$6b3o9b3o$7b2o9b2o7$4bo$2b4o$b2o$o$b2o!
Re: NewLifeCA Back Issues
On February 12, 2022, Dave Greene wrote: NewLifeCA 12 Feb 2022: Setup and security options (please pick one)
Out of 90 or so email addresses from the old LifeCA database, I've gotten 23 opt-ins so far, almost but not quite entirely from people who were active LifeCA participants in the 1990s and/or 2000s -- which is about what I expected. Sometimes you just have to get the band back together.
A second round of emails went out a little later, to twenty-five non-respondents who seemed to be the most likely to have just missed the original opt-in announcement due to spam filters, use of separate email for mailing-list subscriptions, etc. So a few more responses may trickle in. Feel free to spread the word around, especially after we sort this next thing out and maybe everyone will know who is already on the list.
Open-Address Model or Slightly-More-Secure Model?
Here's the next question: should I skip the security precautions and send future NewLifeCA emails directly to every email address in this small group? This would enable simple "Reply All" discussions of topics.
A useful data point is that Bill Gosper has fairly regularly broadcast Life-related messages to groups not too much smaller than this, for the last several years, with no apparent problems. And most of you can probably find each other's email addresses already -- y'all just don't know exactly who y'all are yet.
-- Or should I stick with the BCC: method that I'm using here? That would turn the NewLifeCA list into an "news dispatches only" type group -- which is really what it has been for the last decade or so in any case.
With the BCC: model, anyone who wanted to start a discussion would have to email a "for general release" message to me. That's awkward, but it maybe slightly reduces the chance of someone's account eventually getting hacked and everyone seeing an increase in spam or phishing attempts.
I'd Prefer the Open-Address Model
If I hear no objections, I'll switch from BCC: mode to CC: mode for my next message. Please reply to this email if you object to the plan of sharing email addresses among this group.
I can keep individual people on the BCC: list if they prefer that option. They'll only be able to see the occasional news items coming from me, along the lines of the one I just sent. Any "Reply All" discussions that may get started will be invisible to them. If the group gets too big for the CC: method to be workable, I'll be looking for other options -- but just to get the ball rolling I'm inclined to try the simplest method first.
Re: NewLifeCA Back Issues
On 14 February 2022, Dave Greene wrote: NewLifeCA 14 Feb 2022: CGoL Pattern of the Year summary, and this morning's p28 glider gun
Nobody has officially objected to the simple open-email CC: model for these emails yet, so my next few messages at least will use that format unless I hear otherwise, fairly soon (the next week or so). We're up to 25 email addresses in the list now.
--------------------------------------
The NewLifeCA group is getting its start at an auspicious moment: the Pattern of the Year vote is coming up soon on the conwaylife.com forums. That's always a good place for an overview of what's new in the past year that people might have missed hearing about. Links to this year's thirty-some entries can be found here/
I won't repeat all the nice short summaries from that link. The list is somewhat of a work in progress, not quite ready for voting yet -- but it's in an "explorable" state, and there's a lot of good stuff in there.
Among other things, there's a steampunk-era universal-constructor based spaceship, the #12 "QuickSilver Demonoid", which could have been assembled in the 1990s. It just uses Silver reflectors and gliders ... plus a few scattered still lifes that add up to some suspiciously 21st-century single-channel and self-destruct techniques, to make it all work.
The new spaceship syntheses in #17 include recipes for any size of "Canada Grey" greyship. The #07 "DOGun SaGaQR" is, among other things, a quadratic-growth replicator. There's another spaceship, #07, that is its own glider synthesis, and #28 is a reflectorless rotating oscillator that Golly can actually run -- you can fit up to eleven copies in a (very big) loop.
#08 is a new scalable programmable computer design, which someone is now thinking about hacking so as to be able to run Lisp. Many dozens of new high-period oscillators include a never-before-seen nontrivial p38 that uses a very simple new catalyst (see #18). #26 is some company for Sir Robin in the knightship department, including various periods of oblique rakes and puffers.
There are more interesting items on the list, but the last but definitely not least item that I'll mention is that Andrew D. Wade, the creator of the Gemini spaceship back in 2010, has built a demonstration of an "ash-clearing" mechanism (#31) that is good enough that it _might_ actually allow a replicator to clear out a replicator-sized region of settled ash and build a copy of itself in it, with a more than 50% success rate.
--------------------------------------
Those were all 2021 discoveries, though. I'd better try to keep up with current 2022 events also:
This morning a new glider-producing period-28 mechanism appeared. Since then, the true-period 28 gun has already been reduced in size by almost a factor of 5, and the pseudo-period 14 gun by over a factor of two. There's quite a bit of accumulated sparking and welding expertise out there these days:
Also, following up on my previous message about the new smallest p12 spaceship, the same search method has turned up an interesting period-112 puffer that could have been discovered any time in the past half-century -- but apparently only just showed up two days ago, February 12:Code: Select all
#C p14 gun by iNoMed, based on new p28 gun mechanism by JP21 #C https://conwaylife.com/forums/viewtopic.php?p=141607#p141607 #C https://conwaylife.com/forums/viewtopic.php?p=141620#p141620 #C https://conwaylife.com/forums/viewtopic.php?p=141640#p141640 #C For current optimized versions of various glider guns, see #C https://catagolue.hatsya.com/census/b3s23/synthesis-costs/gun x = 119, y = 95, rule = B3/S23 21b2o11b2o40b2o2bo2b2o11bo7bo$20bo2bo9bo2bo8bob2o22bo6bobo13bobo7bobo$ 20bobo11bobo8b2obo10b2o4b2o3bo2bobo6bo12bobob3obobo$18b2o2bo4b3o4bo2b 2o4b2o14b2o4bo2b2obobo2b2o5b3obo2b2o3bo9bo$19bobob4obob4obobo4bo3b2o 39bo24b2o$18bo2b2ob2o5b2ob2o2bo3bob2obo3b2o13bobo20bo6bo7bo4b2obo$18b 2o5bo5bo5b2o4bo2bo3bobo14bo13bo8b3obo2bo5bo2bo7bo$25bo5bo13bo3bo9b3o 12b2ob2o2b3o10bobob5obobobobo2b2o$23b4o3b4o10b2obo3bo6bo3bo5bo6bobo6bo 24bo$22bo3bobobo3bo9b4o3bo9bo5bobo2bo2bo2bo4b2o$22b2ob7ob2o12bob3o5bo 2bo6b3obob2ob3o9b2obo$27b3o10b2o2bobo3b2o5b2o9b2obobobo9b5o3bo$40bo6bo b3o6b2obo5bobo3b2obo7bob2o6bo3bob2o$38bobo3b4o3bo5bo3bo5bo4b2o3bo5bobo 6bo3b2o3bo$38b2o4b2obo3bo5bob2o6b2o7b2o5bo8b2o3bobo3b2o3b2o$27b2o2bo3b o9bo3bo10b2o5b2o13b2o11bo3b2o3b2o2b2o$26b2obob2o3bo6bo2bo3bobo5bo2bo5b 2o7b2o17b2obo3bobo$19b2o2b3o3bobo3b2o5bob2obo3b2o4bo9bo4b2o3bo25bo$19b 2o2bo4b2obob2o7bo3b2o8bo3bo6bobo3b2obo$23b2o4bo2b2o9b2o12b3o8b2obobobo 11bo$25bo19b2obo7b2o9b3obob2ob3o6b2o$45bob2o6b2o10bobo2bo2bo2bo7b2o6b 5o$4b2o11b2o23bo13bo11bo6bobo12b2ob2o3b2ob2o$3bo2bo9bo2bo11b3o9bo9b3o 9bo8b2ob2o10bo13bo$3bobo3b2ob2o3bobo9b7o5b3o9bo12bo23bo2bo2bo2bo2bo$b 2o2bobo7bobo2b2o4bo2b2obob2o2bo25b3o23bo2bo5bo2bo$2bobobo4bo4bobobo4bo b4o3b4obo40bo10bo9bo$bo2b2o2b7o2b2o2bo3b2o11b2o38b2o10bo3bo3bo3bo$b2o 5bobobobo5b2o4b3o7b3o40b2o9b2o2bo3bo2b2o$10bobo13b2o9b2o10bo38bo5bo3bo 5bob2o$6b3o5b3o9b3obo3bob3o11bo21bo15b3o2b2o3b2o2b3obo2b2o$5bobobo3bob obo13bobo14b3o22bo17bobobobobobo5bob2o$5b2o2b5o2b2o10bobo3bobo34b3o14b 2obo2b2ob2o2bo2b2obo$23b2o2bo9bo50bob2o9b4ob2o$23bo3b4o3b4o45b2o9b2ob 4o9b2obo$12bo8bobo7bobo4b2o42b2o10bob2o2bo2b2ob2o2bob2o$21b2o4b3o5b2o 2bo16bo27bo6b2obo5bobobobobobo$11bobobo10bobobo3bob3o18bo18bobo12b2o2b ob3o2b2o3b2o2b3o$12b3o11bo3b5o20b3o17bo18b2obo5bo3bo5bo$2b2o15bo7b3o5b 2o38bo23b2o2bo3bo2b2o$2b2o8b3o5b2o8b5o2bo37bo2bo20bo3bo3bo3bo$11bobobo 3b2o8bo2bo3b2o37b3o12b2o8bo9bo$29b2o58b2o8bo2bo5bo2bo$14bo48bo27bo7bo 2bo2bo2bo2bo$64bo33bo13bo$2b2o58b3o19b2o13b2ob2o3b2ob2o$2b2o9b5o8bo57b obo16b5o$4b3o2b2ob2o3b2ob2o5b2o52b2obobo$4bo3bo13bo3b2o53bobobo11b2o$ 2b3o4bo2bo2bo2bo2bo61bo12b2o8bobo$2b2o5bo2bo5bo2bo48bo12b2o7bo5bo10bo$ 2bo7bo9bo50bo11b3o5bobo10bo5bo$3bo5bo3bo3bo3bo47b3o11b3o4bobo2bo7bo3bo 3bo5b2o$9b2o2bo3bo2b2o11bo49b3o4bobob2o7bo2bobo2bo5b2o$2b2o3bo5bo3bo5b o10b2o7b2o12b2o15bo8b3o3b2obo10bo3bo3bo$7b3o2b2o3b2o2b3o9b2o7b4o10b4o 12bobo8b2o6bo12bo5bo$b3o6bobobobobobo8b2o11b2ob2o9b2ob2o12b2o8bo2bo4b 2ob2o2b2o5bo$3o4b2obo2b2ob2o2bob2o4bobo13b2o12b2o17bo6bo2bob2obobo2bob o6bobo$7bob2o9b2obo6bo47bo7b3o3bobob2o$2o74b3o13bobo2bo$32b2o55bo2bobo bo10b5o$bo4b2o24bobo12bob2o9b2obo5b3o9bo8b3obob2o5b2ob2o3b2ob2o$7bo7bo 16bo14b2obo2b2ob2o2bob4o13bobo10b2o8bo13bo$b3o3bobo3b3o6b2o26bobobobob obo5bobobobo7b2o21bo2bo2bo2bo2bo$2b3o3b3obo8bobo23b3obo7bob3obob2obob 3o9bo18bo2bo5bo2bo$10b2obo9bo23bo2bobo5bobo2bobo4bo4bo9bo18bo9bo$3b2o 5bo2bo36b4o3b4o5b4ob5o7b3o17bo3bo3bo3bo$39b2o8bo3bo3bo3bo7bobobo2b2o 25b2o2bo3bo2b2o$4bo24b2ob2o5bobo8b2o7b2o5b2obo2bo2bo2bo9bo12bo5bo3bo5b o$9bo2bo10b2o3bobobo6bo26b2obo5bob2o7bobo12b3o2b2o3b2o2b3o$4b3o3b2o3b 2o5bob5obo2bo15b4o5b4o8b4obobo9b2o15bobobobobobo$5b3o6bobo6bob2ob2ob3o 14bob2o2b3o2b2obo8b5o2bo12bo9b2obo2b2ob2o2bob2o$16bo6bobo4bo18b2ob7ob 2o9bo4b3o13bo8bob2o9b2obo$6b2o13b3o4bob2o40b4o14b3o$2bo18b3o4b2o2bo13b 2o19b2o7bo$obo4bo12b2o6b5o13bobo18bobobobob2o18bo$bobo2bo13b3o23bo23b 2ob2o18bobo$bo4b2o5bobobo2b2o6b5o27bo11bo3b3o15b2o$6b2o4b2ob2o4b3o4b2o 2bo27b2o10bob2o2bo19bo$6b3o2bobobo5b3o4bob2o9b2o10bob6obo4b2o4bobo23bo $b3o2b3o14bobo4bo11bo8b2o2b2ob2o2b2o3b2o28b3o$6b3o14bob2ob2ob3o8bobo7b ob6obo$6b2o14bob5obo2bo9bobo7b2o47bo$bo4b2o15b2o3bobobo12b2ob2o4bo45bo bo$bobo2bo22b2ob2o14b2o51b2o$obo4bo34b2o61bo$2bo40bo62bo$6b2o32b3o11bo 9bo2b3o2b2o30b3o$14b2o24bo9bobobob7obobob2o2b2o$7b2o5b2o16b3o14b2o5b7o 6b3o37bo$6bo26b2o12bob2o6b5o9bo35bobo$4b3o24bo2b2o2bo4bobobobo5bo3bo3b o7bo36b2o$4b2o25b2o3bobobob2o9b2o4bo4b2o46bo$4bo2bo28bo5b2o11b2o2bo2b 2o49bo$6b2o34bo11bo9bo46b3o!
For comparison, the only period-112 technology of any kind in the jslife collection, including the more recent moving-objects update, seems to be this much larger period-quadrupled forerake -- making 28 a perfect number to be talking about today:Code: Select all
#C predecessor of p112 puffer x = 18, y = 7, rule = B3/S23 8b3o3b3o$2b3o2bo2bo3bo2bo$bo2bo5bo3bo$4bo5bo3bo$o3bo4bo5bobo$4bo3bo$bobo!
Code: Select all
x = 63, y = 51, rule = B3/S23 7bo47bo$6b3o45b3o$4b2ob3o20b3o20b3ob2o$5bo2bob2o4bo4bo7bo3bo7bo4bo4b2o bo2bo$2b2obo4bobob2ob2ob3o5b2o3b2o5b3ob2ob2obobo4bob2o$2b2obobo2bobo7b 4o3b2obobob2o3b4o7bobo2bobob2o$2bo8b3obobob2o2b2ob2ob2ob2ob2ob2o2b2obo bob3o8bo$b2o7b2o12bobo3bobo3bobo12b2o7b2o2$5b3o15b2ob2ob2ob2ob2ob2o15b 3o$4bo3bo45bo3bo$3b2o4bo11b21o11bo4b2o$2bobob2ob2o3b3o2b2obo4bo7bo4bob 2o2b3o3b2ob2obobo$b2obo4bob2ob3obo25bob3ob2obo4bob2o$o4bo3bo4bobo4bo4b obob3obobo4bo4bobo4bo3bo4bo$12bo5b2o23b2o5bo$2o7b2o41b2o7b2o$30b3o$21b 3o$20bo2bo$23bo$19bo3bo4b2o$23bo4b2o$20bobo$37b3o$37bo2bo$37bo$37bo3bo $22bo7b3o4bo3bo3bo4b3o$21b3o5bo7bo6b3o2bo2bo$20b2obo5bo8bobo3bob2o4bo$ 20b3o6bo3bo11b4o3bo$20b3o7b3o12b2o5bo$20b3o26bo2bo$21b2o12b2o13b2o$34b obo15bo$36bo$48b2o3bo$48b2obo$48bo2b2o$49b3o$42b2o$41bobo$43bo5$49b2o$ 48bobo$50bo!
Re: NewLifeCA Back Issues
On February 15, 2022, Dave Greene wrote: NewLifeCA 15 Feb 2022: where did this new period-30 gun come from?
I'm sending more NewLifeCA emails than I usually would -- please don't expect this to be the normal rate going forward! -- but these are exciting times.
As some of you have already heard, a new period-30 glider gun was discovered today, that needs only one queen-bee shuttle instead of the two colliding shuttles that have been the norm for the past half-century or so:
There are other options for the sparkers that help with the glider extraction, including the use of a pentadecathlon, which takes a bit more space but allows this gun mechanism to be glider-constructed relatively easily. In a standard p30-gun synthesis, the two queen bees have to be started up by two gliders with precise relative timing, but here there's only one queen bee to start up, so the trigger glider can be delayed by any multiple of fifteen ticks and it will still work fine:Code: Select all
x = 28, y = 18, rule = B3/S23 14b2o$14bo2bo3$14bob2o2b2o$9b2o2bobo4bo$9bo4bo6b3ob2o$2b3o8bo9bob2o$2b 3o5bo2bo$2o22b3o$2o13bo8bo2bo$2o12bobo9b2o$12b2o3bo$8b3ob2o3bo$12b2o3b o$6bo7bobo$6bo8bo$6bo!
Alternate sparkers even allow glider streams to be extracted from both ends of one queen-bee shuttle -- though there's not a whole lot of point since only one stream at most can escape without interfering with the other one:Code: Select all
#C see the following link for a one-glider seed for a #C standard Gosper glider gun, for comparison purposes -- #C this new one is significantly simpler: #C https://conwaylife.com/forums/viewtopic.php?p=71963#p71963 x = 75, y = 83, rule = B3/S23 7bo$6bobo$6b2o9$7bo$6bobo$6b2o4$7bo$7b3o$10bo$9b2o3$b2o$obo$2o2$32b2o$ 7b3o5b2o9b2o4bobo$14bobo9b2o4bo$5bo8b2o$5bo5bo$5bo5bo$11bo47$73bo$72b 2o$72bobo!
Here's some background on the developments leading up to this discovery.Code: Select all
x = 38, y = 28, rule = B3/S23 6bo2bo3b5o2b5o3bo2bo$3bo2bo2bo7bo2bo7bo2bo2bo$2bob3o2b5o3bo2bo3b5o2b3o bo$3bo30bo2$bo23bo$o2bo3bo11b2o4b3o7b3o$o2bo2b3o10b2o2b2ob2o6b3o$2bob 2obobo6b2o6bo3bo$4b3ob3o4b3o6b2ob3o$4b2obobo6b2o6bo5bo$2b3ob3o10b2o2b 2obobobo3b2o$bobo3bo11b2o4b2obob2o2bobo$bo34bo$2o12bo21b2o$15bo$13b3o 2$20bo$18b2o$19b2o2$23b2o$19bo3b2o$18bobo$17bobo$17bo$16b2o!
Adam P. Goucher's "Catagolue" (not a misspelling) has been gathering "apgsearch" soup-search results for just about seven years now, from anyone willing to contribute CPU-hours to running random soups and contributing the resulting censuses of objects. New objects that have never been seen in a soup before get their own page on Catagolue, like this one that showed up this morning.
The single-engine p30 gun showed up in tetramer form in the 31x31 soup pattern that that page links to:
On the "ConwayLife Lounge" Discord server, this new arrival was quickly noticed, reduced to dimer form and then to the monomer forms shown above.Code: Select all
x = 31, y = 31, rule = B3/S23 2b2o2bo2b3obo3bob3o2bo2b2o$4obo3b2obob3obob2o3bob4o$obobob3obo2b2ob2o 2bob3obobobo$ob2ob2obo4b5o4bob2ob2obo$obo8b9o8bobo$ob3o3b3ob2obob2ob3o 3b3obo$b4obo4bo2bobo2bo4bob4o$bo2bob2ob6ob6ob2obo2bo$2obo2bob2ob2obobo b2ob2obo2bob2o$2b2ob2ob4o7b4ob2ob2o$3o2b4o4b2ob2o4b4o2b3o$3bob2obobo2b 5o2bobob2obo$b2o4b3o3bo3bo3b3o4b2o$3obo4b5obob5o4bob3o$2ob2o2b6ob3ob6o 2b2ob2o$2bobobob2o3b5o3b2obobobo$2ob2o2b6ob3ob6o2b2ob2o$3obo4b5obob5o 4bob3o$b2o4b3o3bo3bo3b3o4b2o$3bob2obobo2b5o2bobob2obo$3o2b4o4b2ob2o4b 4o2b3o$2b2ob2ob4o7b4ob2ob2o$2obo2bob2ob2obobob2ob2obo2bob2o$bo2bob2ob 6ob6ob2obo2bo$b4obo4bo2bobo2bo4bob4o$ob3o3b3ob2obob2ob3o3b3obo$obo8b9o 8bobo$ob2ob2obo4b5o4bob2ob2obo$obobob3obo2b2ob2o2bob3obobobo$4obo3b2ob ob3obob2o3bob4o$2b2o2bo2b3obo3bob3o2bo2b2o!
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This is not the first gun to show up in a "semi-natural" (symmetric) soup, however. Jason's Summers' p156 gun shows up quite regularly in the D4_x4 symmetry, in various forms, as the large number of soup links shows:
https://catagolue.hatsya.com/object/yl7 ... 035/b3s23/
https://catagolue.hatsya.com/object/xp3 ... yg33/b3s23
https://catagolue.hatsya.com/census/b3s23/D4_x4/yl312
(lots of trivially different ways to suppress some of the glider streams)
And just three days ago a semi-natural period-46 bi-gun showed up in a different symmetry, C2_2. This one is probably less likely to show up naturally any time soon (i.e., in an asymmetric soup), but of course it's not impossible.
Before that, in mid-December, a single-engine period-46 gun showed up, but that wasn't a soup-search result; it was an engineered discovery using a new catalyst -- in fact, the same "traffic stop" mechanism that also completed the period-38 oscillator last month.
--------------------------------------------------
The first gun appearance in C1 (asymmetric 16x16) soups is one of the big events that has yet to happen on Catagolue. Catagolue is approaching the point where it has collected enough soups that a gun might be expected to spontaneously occur -- we seem to be in about the right order of magnitude, anyway.
The reason why so many new things are showing up in symmetric soups all of a sudden is that Charity Engine, https://www.charityengine.com/ , has recently taken an interest in donating a small percentage of its spare capacity to our particular brand of mathematical research... and the people running the scripts have decided to prioritize symmetric soups rather than C1 soups.
This decision was made on the grounds that interesting new oscillators can more commonly be found in symmetric soups. There's been a significant increase in focus on finding new oscillators and oscillator periods in the last year, based largely on the work of a newcomer to the forums named David Raucci, or "hotDogPi".
-- Okay, enough Life news for now. I'm kind of hoping things will maybe quiet down for a little while...!
Keep the cheer,
Dave
Re: NewLifeCA Back Issues
NewLifeCA #5 forwarded response, 3/1/2022, 10:59pmOn March 1, 2022, Dave Greene wrote: NewLifeCA 1 March 2022: What's That Floating In My Soup?
Period 23 Redux
We already had a p23 oscillator, "David Hilbert" -- but JP21 found a smaller one a couple of weeks ago:
Kaleidoscopic DiehardsCode: Select all
#N p23 honeyfarm hassler #O JP21, 16 February 2022 #C https://conwaylife.com/forums/viewtopic.php?p=141729#p141729 x = 19, y = 21, rule = B3/S23 8b2o$2bob2obobo4bo$2b2obobo4b3o$6b2o3bo$11b2o$2o15b2o$bo15bo$bobo11bob o$2b2o3bo2bo4b2o$9b2o2$8b2o$2b2o4bo2bo3b2o$bobo11bobo$bo15bo$2o15b2o$ 6b2o$7bo3b2o$4b3o4bobob2o$4bo4bobob2obo$9b2o!
An entertaining diehard showed up on February 21. Catagolue collects these things now, so we have a lot of them to choose from. Impressively, this new one beats the previous record for symmetric "messless methuselahs" by over 400 ticks:
I mentioned Charity Engine's recent contributions to soup searching in my last email. New symmetric soup hauls are still coming in from that source, though at a somewhat reduced rate compared to the initial surge.Code: Select all
#N 2474-tick C4_4 diehard #O Charity Engine, 21 February 2022 #C https://conwaylife.com/forums/viewtopic.php?p=141951#p141951 x = 32, y = 32, rule = B3/S23 7b2o2b3o4b2obobo3b2o$b2o3bob2obo2bobobob2o2b3ob3o$b4ob3obo2bo2b2o2b3ob ob2ob2o$2obo2b2o3b2ob2ob3obobo4b2o$obo3bob5o2bobob2obo2b2o2bo$b2ob5o3b o2bob2o2bobo2bo$bo2bo2bo6bo3b4ob2ob5o$b2o3bobob5obob6ob2ob2obo$o2bob3o bo3b2obo3bobobob2ob3o$2bobo2b2o8b2obo2bo3bo2bo$4ob3o2b2obo2bobob2o2bo 2bobo$b2obob5o3bob3o2bo2bo2b2ob2o$o2b2ob2o5bo2bo7bob3o2bo$2obob3ob3ob 3o2b2obob2o4bobo$2b4o3bobo2bob3obo2b3o2bobo$b2o4b2ob3ob3obo7b3o$3b3o7b ob3ob3ob2o4b2o$bobo2b3o2bob3obo2bobo3b4o$obo4b2obob2o2b3ob3ob3obob2o$o 2b3obo7bo2bo5b2ob2o2bo$2ob2o2bo2bo2b3obo3b5obob2o$2bobo2bo2b2obobo2bob 2o2b3ob4o$bo2bo3bo2bob2o8b2o2bobo$3ob2obobobo3bob2o3bob3obo2bo$ob2ob2o b6obob5obobo3b2o$b5ob2ob4o3bo6bo2bo2bo$5bo2bobo2b2obo2bo3b5ob2o$2bo2b 2o2bob2obobo2b5obo3bobo$2b2o4bobob3ob2ob2o3b2o2bob2o$b2ob2obob3o2b2o2b o2bob3ob4o$b3ob3o2b2obobobo2bob2obo3b2o$3b2o3bobob2o4b3o2b2o!
58P8H4V0 and Synthesis
Another very interesting Charity Engine object showed up in a symmetric soup on February 24th: it's a period-8 c/2 spaceship that nobody knew existed!
It's extremely rare that a soup search turns up a spaceship that hasn't been previously found by some other method. New oscillators do show up occasionally in soups, but spaceships not so much.
I think the only other new spaceship discovery from a Catagolue/apgsearch soup so far has been the pufferfish spaceship -- and even that showed up in puffer form, and needed some add-on engineering to make it into an actual spaceship.Code: Select all
#N 58P8H4V0 #O Charity Engine, 24 February 2022 #C https://conwaylife.com/forums/viewtopic.php?p=142084#p142084 #C Several new puffers have been found based on this spaceship: #C https://conwaylife.com/wiki/58P8H4V0 #C The spaceship and the source soup can be found on Catagolue, #C along with the cheapest glider construction (currently 53 gliders). #C http://catagolue.appspot.com/object?apgcode=xq8_ciire2272hm0mh2722eriiczw1x2c8960698c2x1&rule=b3s23 x = 23, y = 12, rule = B3/S23 7b3o3b3o$6bo2bo3bo2bo$6bo3bobo3bo$2bo5bo5bo5bo$b3o5bo3bo5b3o$2o7bo3bo 7b2o$2b3ob4o3b4ob3o$7b3o3b3o3$o21bo$b2o17b2o!
The record-breaking smallest period-12 c/2 spaceship mentioned recently in a NewLifeCA message -- the "35P12H6V0" that is compatible with pufferfish tagalongs -- was technically also found with a type of soup search. However, that search was seeded with working c/2 front ends, so the starting patterns weren't entirely random.
On the other hand, it's quite common that a new appearance of a known spaceship in a soup will give some good hints about how to construct the spaceship efficiently by colliding gliders. That might partly account for Goldtiger997's and Mark Niemiec's speedy turnaround on a glider synthesis for 58P8H4V0.
... However, I think that most of the explanation for that quick work is that we have a much bigger and deeper pool of glider-synthesis expertise today than we did nineteen years ago this month, when the first non-Cordership and non-*WSS-based spaceship recipe showed up (for 60P5H2V0).
Depending on how you count, there are syntheses known now for around fifty types of spaceships, and more than half of them have been solved in the last three years -- more often than not by the new generation of Lifenthusiasts that do most of their collaborations on the "ConwayLife Lounge" Discord server.
https://conwaylife.com/wiki/Glider_synt ... _syntheses
New Oscillator Engines
Meanwhile, hotDogPi is continuing to turn up more surprising new spark-assisted oscillator engines, like this period-30 double pi factory from this morning:
hotDogPi's oscillator search program isn't soup-based, for a change; it involves starting with various arrangements of common objects, adding sparks in lots of possible positions, and running the result to find the rare cases where the same arrangement reappears after some number of ticks (minus the sparks).Code: Select all
#N p30 suppressed double pi factory #O hotDogPi, 1 March 2022 #C https://conwaylife.com/forums/viewtopic.php?p=142297#p142297 x = 34, y = 34, rule = B3/S23 18bo$16b3o$15bo7b2o$15bo2b3obo2bo$12b2obobo2bob2o2bo$12bo2bob2o2bo2b2o $14bo3b2ob3o$15b2obo4bo$17b2obobo$13b3o4bob4o$12bo2b5obo4bo$13bo7bob3o $4b2o4bo3b3o6bo$4bo4bobo4bo4b2o$6bo2bo2bo4b5o$2b4obob2obo$bo3bobo2bob 2o15b2ob2o$bo2bo2b2obo2bo16bobo$2obobo4b2o8b3o7bobo$3bo4b2o2bo6bo2bo6b 2ob2o$3b2o3b2ob2o6bo2bo7bobo$6bo4b2o7b2o8bobo$3b2obob2o19b2ob2o$2bobob 2obob3o$2bo2bo3bobo$3bobo3bobo$4bo5bo3$16bo2bo2bo$16b7o2$16b7o$16bo2bo 2bo!
On March 1, 2022, Dean Hickerson wrote:As it happens, I've been working on diehards recently, both by random searching and by constructions. I think that random searches are the way to go up to about 18x18, but that constructions, using objects found by specialized searches, are better after that. In particular, the best 16x16 found by Catagolue beats my best construction by 101 generations, but my best 32x32 beats the one above by 6570 gens. Eventually I'll post my findings on the conwaylife.com forum, but for now I'll just show my 32x32. (I doubt that this is anywhere close to maximal for this size.)Dave Greene wrote:NewLifeCA 1 March 2022: What's That Floating In My Soup?
... An entertaining diehard showed up on February 21. Catagolue collects these things now, so we have a lot of them to choose from. Impressively, this new one beats the previous record for symmetric "messless methuselahs" by over 400 ticks:
#N 2474-tick C4_4 diehard
#O Charity Engine, 21 February 2022
#C viewtopic.php?p=141951#p141951
x = 32, y = 32, rule = B3/S23...
Code: Select all
#N 9044-tick diehard #O Dean Hickerson x = 32, y = 32, rule = B3/S23 18b2o$14b2obo2bob2ob2o$14bob2o2b2obob2o2$6b2o$obobo2bo$bo13bo$bob2obo 7bobo10b3o$2ob3o8bobo10bo$o3bo11bo11bo$2o5bo$2o4b2o8b2o$3bo10bobo$3bo 11bobo$5bo3b2o4b3o$9bo$3bo7bo2bobo$3b2o5b2o3b2o$15bo9bo$13bobo6b5o$13b obo5bo4b2o$14bo6bo4bo$24b2o$2b2o4b2o15bo$2bobo2bobo2b2o13b3o$4bo2bo4bo 5b2o5b2obob2o$4b2ob2o5bobo2bo5b2o3b2o$7bo2bo2b2ob2o8bobob2o$7bob2o14b 2ob2o$3b2ob2obo15b3o$3b2obo2bo5b2o$7b2o6b2o!
On March 1, 2022, Dave Greene wrote:I'll have to see if I can hit five digits at least, with a 32x32 diehard -- this example gives me some ideas, for sure.Dean Hickerspn wrote:...for now I'll just show my 32x32. (I doubt that this is anywhere close to maximal for this size.)
Re: NewLifeCA Back Issues
NewLifeCA #6 forwarded response, 3/6/2022 12:30pmOn March 6, 2022, Dave Greene wrote: NewLifeCA 6 March 2022: Re: Better 32x32 diehard
I did spend a little time looking for a 32x32 diehard with five-digit survival time, investigating collisions between 2c/5 spaceships and *WSSes that could then be cleaned up with a c/10 copperhead. The best I've come up with so far is this, which isn't quite good enough -- the 2c/5 is too big, and having to generate *two* LWSSes at the last moment would leave too little room in 32x32 for any decent delay circuitry.
Unfortunately none of the collisions of *WSSes with really small 2c/5s seem to leave an object or constellation behind that can be cleaned up with a single copperhead. I haven't done a really complete survey, but I think I've covered all of the obvious options. Didn't try a fireship, but that's probably too big to fit in the starting pattern.Code: Select all
x = 104, y = 31, rule = B3/S23 4b3ob2o$bo4b2o2b2o$2o5bo4bo$2o5bo4bo$bo4b2o2b2o26bo52bo$4b3ob2o29bo50b obo$35bo3bo47b3o3bo$36b4o48b3obo$90b2o2$92bob2o$91bo2bobo$92bo3b2o$92b obobo$91b2ob2o$92bo2$93bo$97bo$94bo3b2o$71bo23bo2b2o$72bo21bob4o$68bo 3bo$69b4o$99bob2o$98bob2obo$99bo3bo$100b2obo$99bob2o$97bobo$97bobo!
However, in the meantime Dean has found a way to get several thousand ticks past the five-digit mark, using a c/3 target instead of a 2c/5 one -- see below. 14,011+ is the new target!
NewLifeCA #6 forwarded response, 3/6/2022 10:59pmOn March 6, 2022, Dean Hickerson wrote: NewLifeCA 6 March 2022: Re: Better 32x32 diehardI've been trying to do that too, and today I succeeded.Dave Greene wrote:I'll have to see if I can hit five digits at least, with a 32x32 diehard -- this example gives me some ideas, for sure.
The pattern that I sent before used 2 spaceships to delay its death. If the leading one has speed S, the trailing one has speed T, and the LWSS (or other c/2) is formed in generation N, then the pattern dies at about generation SN/((1-2S)T). We want the factor S/((1-2S)T) to be as large as possible. For that we'd like S to be large (but < 1/2) and T to be small.
The 9044-tick pattern used 2c/5 and c/3, giving a factor of 6. Using 2c/5 and c/10 would give a factor of 20, but I never found a combination that works; the c/10 spaceship tends to create a big mess when it hits something. I was able to fix it by adding two c/3 spaceships between the leader and the trailer, but that won't fit in a 32x32 box.
Yesterday I decided to try c/3 and c/10, for a factor of 10. I didn't really expect it to work, but it does. My first attempt lived for about 13000 gens, but adding a couple of one-time glider reflectors, and backing up a few gens with lifesrc increased that to 14010. That could probably be improved with enough searching.
Code: Select all
#N 14010-tick diehard #O Dean Hickerson, 3/6/2022 x = 32, y = 32, rule = B3/S23 3b2o2b2obobo4bobo3bo$3bo5b2obobo2bo3bobo$2obo2b4o2b2o4bo2bo$bob2ob2o3b 2o4bo4bo$bo2bobobo2bo2bo$2ob2o4bo4bo4b4obo$3b2o2b2obo2bo3b2o5bo3bo$3bo bo2bo9bobo6bobo$4b2o4bobo6b4o6b2o$3bob2o4bo2bo3b2o2bo6bo$10b2o2bo13bob o$30bo$31bo$7b2o3b2o15bobo$b2o5bo2bobo6bo7bo2bo$b2o2b3o3b2o6bobo$5bo 13bo2bo6b3o$b2o17bobo7b2o$ob6o13bo7bo$o4bo2bo15b2o4b2o$b3o3b2o14bobo2b obo$3b2o18b2o4bo2$6b2o$5bobo5b2o4b2o$5b2o6bo2bo3bo$17bo5b3o$14bob3o5b 2o$ob2o2b2o8b2o3b2o$2obo2b2o6bo$15b3ob2o$14bo2b4o!
On March 6, 2022, Dean Hickerson wrote: NewLifeCA 6 March 2022: Re: Better 32x32 diehard
For what it's worth, my solution using 2 intermediate c/3 spaceships is shown in this 36x36 diehard:Dave Greene wrote:The best I've come up with so far is this, which isn't quite good enough -- the 2c/5 is too big, and having to generate *two* LWSSes at the last moment would leave too little room in 32x32 for any decent delay circuitry.
I didn't find a way to do it with only 1 intermediate c/3, but I could have missed something.Code: Select all
# 18477-tick diehard x = 36, y = 36, rule = B3/S23 13bo4bo$14b2o3b2o$7bo6b2o3b2o$2bob2o2bo4bo4bo$4b3o3bo4bo4bo$o8bo3bobo 3b3o$o4b2o2b2o2bobo5bo$obobo3bobo3bo6b2o$o8bo5b2o3bo5bob2o$2bob3o8bo3b obo3b3o2bo$4b2o2bobo2b3o3bobo2bob2o2bo$7bo6bo6bo7b2o$12bo6bo7b3o$13b2o 5b2o5b3obo$13b2o5b2o6bob4o$12bo6bo8bo2bo2bo$35bo$31bo2bo$31b3o$28bob2o $29bo2$2ob2o19b2o3bo2bobo$2obobo6b2o9bobo2bo4b2o$4bo7bo2bo7b2o3bo2b2ob o$14b2o13b2o4bo$34b2o$3b2o13b2o4b2o$3b2o13bobo2bobo$20bo2bo5bo3bo$12b 2o5b2ob2o4bobobobo$12b2o3bo2bo8bo3bo$17b2obo$18bob2ob2o8bo$18bo2bob2o 7bobo$19b2o11b2o!
Re: NewLifeCA Back Issues
NewLifeCA #6 forwarded response, 3/14/2022 10:59pmOn March 7, 2022, Dave Greene wrote: NewLifeCA 7 March 2022: Re: Better 32x32 diehard
Intermediate c/3 spaceships! There's no reason those have to be c/3, and in particular they take up more space than a single c/7 loafer would. Not sure the geometry will allow for shrinking to 32x32, but there's a lot of search space to explore.
On March 14, 2022, Dean Hickerson wrote: Re: Better 32x32 diehard
Yeah, I really ought to automate the process; I didn't find anything during a brief, unautomated search.Dave Greene wrote:Intermediate c/3 spaceships! There's no reason those have to be c/3, and in particular they take up more space than a single c/7 loafer would. Not sure the geometry will allow for shrinking to 32x32, but there's a lot of search space to explore.
An even better thing to find would be a reaction that sends a *WSS back to the starting location; then a diehard could use this trick multiple times.
Meanwhile, I found a way to move part of the 14010-tick diehard farther south, giving more room in the northwest. That allowed me to delay production of the LWSS by 403 gens, giving this better diehard:
Code: Select all
#N 18049-tick diehard #O Dean Hickerson, 3/14/2022 x = 32, y = 32, rule = B3/S23 ob4o$3o4b3o4bo$4bo10bo2bo$2b2obob2o6bobob2o$2b2ob2o4b2o5b2ob2o$3b2o6b 2o5b2ob2o$7bo7bobob2o7bo$2b2o11bo2bo8bobo$7bo6bo12bobo$5b3o21bo$4bo6bo 17b2o$4bob2o2bobo15bobo$5bobo3b2o$29b3o$20bo8bobo$7b2o3b2o5bobo6bobo$b 2o5bo2bobo5bo2bo7b2o$b2o2b3o3b2o7bobo$5bo15bo8bo$b2o21b2o2bobo$ob6o15b obo2bobo$o4bo2bo14b2o4bo$b3o3b2o$3b2o$13b2o4b2o$3b2o3bobo2bo2bo3bo$b6o b2o7bo5b3o$3o2b2o2b2o3bob3o5b2o$2obo4b3o5b2o3b2o$2o4bob2o4bo$3bobo4bo 4b3ob2o$bobobobob2o3bo2b4o!
Re: NewLifeCA Back Issues
On March 8, 2022, Dave Greene wrote: NewLifeCA 8 March 2022: new smallest 3c/7 spaceship, semi-natural darts, and an SSGRL
Does anyone object to patterns being referenced in the form of links to LifeViewer-enabled pages? I can make a habit of sending actual RLE in these emails, but for larger patterns especially, links just seem a lot more convenient.
For all of you spaceship aficionados out there, in late February Keith Amling came up with a new lower-population stabilization for the front end of the known "Anura" and "Soba" 3c/7 spaceships.
Use "Show in Viewer" for the next several posts starting from the first link, to see some of the connections now available at 3c/7.
Also, thanks to the recent Charity-Engine-driven surge of symmetric soup searches, a c/3 spaceship -- or rather a pair of them, darts of course -- has appeared "semi-naturally", in a D4_+1 soup.
The exploration of new oscillator engines is still under way: now for the first time there's a true-period p30 gun that doesn't contain any queen-bee shuttles. (There aren't any known ways to split a glider into two gliders with just pentadecathlons, and bounce one of them around into a closed loop -- right?)
And last but not least, this morning Goldtiger997 posted an SSGRL -- "self-synthesizing glide-reflecting loopship" -- with a design similar to last year's self-synthesizing oblique loopship and self-constructing reflectorless rotating oscillator (both also by Goldtiger997).Code: Select all
#N queen-bee-less p30 glider gun #C David Raucci, 1 March 2022 #C https://conwaylife.com/forums/viewtopic.php?p=142297#p142297 x = 40, y = 33, rule = B3/S23 18bo$18bo6b2o$18bo6bo$23bobo$23b2o2$4bo5bo$3bobo3bobo18bo6bo$2bo2bo3bo bo17b2o6b2o$2bobob2obob2o6bo8b3o6b3o$3b2o3b2o3b2o3b3o8b2o6b2o$6bo3bob 3o2b2o2bo8bo6bo$3b2ob2obobo2b2o2bo2bo$3bo2bo3bo2b3o3b2o$2obo4bob2ob3o 12bo$bo2b2o2bobo3bo11bobo$bo5bo2bob2o13b2o$2b4obob2obo$6bo2bo2bo$4bo4b obo4b2o2bobo$4b2o4bo3b3ob2obobo$13bo4bo2bob3o9bo$12bo2b4o7bo9bo$13b3o 4bob4o8b3o$17bob2obo$15b4obo2bo$14bo7b2o$12bo2b3o6b2o$12b2obobo2bob2o 2bo$15bo2b3obo2bo$15bo7b2o$16b3o$18bo!
A "loopship" is a type of self-constructing spaceship that travels by repeatedly creating a signal storage loop big enough to hold the construction recipe for that same memory storage loop.
The other distinction here is that "self-constructing" means some kind of stored recipe and universal-constructor technology is at work in moving the spaceship -- but "self-synthesizing" means that the spaceship consists of nothing but gliders rewindable to infinity at some point in its evolution, and therefore it is its own glider synthesis.
Interestingly enough, the default synthesis is nowhere near the minimum cost to construct one of these self-synthesizing spaceships. The total number of gliders could be cut very nearly in half, from 141,617 (for the current SSGRL) to somewhere in the neighborhood of 75,000 gliders. Nobody has tackled that little optimization project yet.
Keep the cheer,
Dave
Re: NewLifeCA Back Issues
NewLifeCA #9 forwarded response: 3/14/2022 9:10amOn March 11, 2022, Dave Greene wrote: NewLifeCA 11 March 2022: smaller p6 pipsquirter, and final printable Life textbook!
Sometime a year or two ago, a p6 pipsquirter with lower population and slightly different clearance was posted to the forums -- but nobody can yet find where it was exactly. It showed up recently because someone had copied it into their own sparker stamp collection. Apparently it didn't get noticed by many people when it was posted, because if it had been, the p42 glider gun would have been updated to use it:
The smaller pipsquirters only work in one position to help with a p6 "bouncer" glider reflection, though. So Noam's original p6 pipsquirter from nearly 25 years ago (November 1997) is really holding up surprisingly well -- it has better fallback, so it works in two adjacent positions.Code: Select all
#C See https://conwaylife.com/forums/viewtopic.php?p=142671#p142671 #C This gun is two rows shorter than yesterday's smallest-known p42 gun. #C The p21 engine was found by David Raucci (hotDogPi) in 2021; #C the use of 28P7.3 to extract gliders was by Tanner Jacobi; #C the 38P7.2 oscillators are by Nicolay Beluchenko in 2009; #C and a search is going on for the source of the smaller p6 pipsquirters. x = 43, y = 46, rule = B3/S23 32b2o$32b2o$33bo3bob3o$32bo3b6o$31bo6bo$32b5o$17b2o$18bo8bo4b5o$17bo7b 3o3bo6bo$17b2o5bo7bo3b6o$19bo4b2o7bo3bob3o$17b2o13b2o$16bo4b2o9b2o$11b o4b4o2bo$2bo7bobo7bobo12b2o$2b3o5bobo5bo12bo5b2o$5bo3b2o2b2o3b2o5b2o2b o2b6obo$4bo2bo3b2o2bo8b3obo10b2o$4bo3b3o2b3o7b2o10bob3o$5b2o5bo11bob6o 2bo2b2o$9bo3bo11b2o5bo8bo$9b4o5bo8b2o11bobo$11bo5bo23b2o$17b3o10b2o$ 30b2o$12bo9b3obo3bo$2o5b2o3b2o8b6o3bo$bo5b2o3b2o11bo6bo$bobo23b5o$2b2o $6b2o19b5o$5bobo17bo6bo$6bo4bobo8b6o3bo$12b2o8b3obo3bo$12bo17b2o$30b2o $4b2o$4b2obo$3bo3bo$4bobobo2bo$b3o2b5obo$bo2b2o5b2o$2b2o2b2o3bo10bo$4b obo5b3o8b2o$4bobo7bo7b2o$5bo!
The glider gun collection has been through several rounds of reduction since Dieter Leithner and Peter Rott's original late-1990's collection, but it still serves as a very good litmus test for new circuit technology: if a Herschel conduit, period multiplier, reflector, or other mechanism can reduce the size of at least one gun, it's pretty much guaranteed to be an interesting new find rather than a rediscovery.
The minimum bounding box is still the overriding criterion for determining membership in the current collection, which is now kept up-to-date via the "gun" and "guntrue" pages on Catagolue (two separate collections, the second one for true-period guns only).
Links are on the right side of that page, or there's an undocumented "textcensus" option to give the size of each gun:
https://catagolue.hatsya.com/textcensus ... -costs/gun
https://catagolue.hatsya.com/textcensus ... ts/guntrue
Updating an entry in either of these collections is now just a matter of scrolling to the bottom of the above "syntheses" page and pasting in RLE for a working gun. If the gun is a record-breaker, it will show up in the appropriate list(s) on Catagolue within the next eight hours.
If anyone wants to try this out, there are a lot of four-digit prime-period guns at the top of the lists that should be relatively easy to reduce. It's impressively difficult to improve the bounding box of guns with periods below 1024, at this point!
Life Textbook Finally Ready to Print
For the last few months we've been trying out Lulu.com's print-on-demand printing service, and have gotten fairly reliable quality in all of the trial books we've printed so far. The colors look a little nicer in some prints than in others, apparently unpredictably... but it has always been good enough -- the illustrations are clear, and the books are nice and solid, stay open to the page you open them to, and so on.
Due diligence is done, so we've gone ahead and pushed the "submit for global distribution" button. At some point in the next month or two, the book should show up as a print-on-demand option in searches on Amazon and Barnes&Noble and so on. In the meantime, it can already be ordered via Lulu.com. The book website is updated with the details, and there's a Kickstarter running at the moment. I'm heading for G4G14 in less than a month, and figured I should have a box of books to bring along.
Here's Nathaniel's writeup on Reddit, and the Kickstarter link.
Blurbs?
Related to this, here's a rare request for the NewLifeCA group -- or, well, not really a request, more like a hopeful but thoroughly optional suggestion.
A few nice positive tweets have come in about the book so far, from Ned Batchelder and Rudy Rucker.
If anyone happens to feel like saying something good about the book that could be used as a "blurb" on the https://conwaylife.com/book/ page, please feel free to say it soon (and let me know where you said it)!
Keep the cheer,
Dave
On March 14, 2022, Dean Hickerson wrote: Regarding the gun collection, Dave Greene wrote:
It seems strange that this is done on the "syntheses" page, since a gun isn't a synthesis of anything. But it does work; see below.Dave Greene wrote:Updating an entry in either of these collections is now just a matter of scrolling to the bottom of the above "syntheses" page and pasting in RLE for a working gun. If the gun is a record-breaker, it will show up in the appropriate list(s) on Catagolue within the next eight hours.
I recently needed a period 1216 gun, and found that adding a quadri-Snark to the p304 gun in the collection gave a smaller p1216 than the one that was there. I submitted it 2 days ago, and the collection has been updated:Dave Greene wrote:If anyone wants to try this out, there are a lot of four-digit prime-period guns at the top of the lists that should be relatively easy to reduce.
https://catagolue.hatsya.com/object/gun_1216/b3s23
There are probably other composite-period guns that could be reduced in this way.
Dean Hickerson
Re: NewLifeCA Back Issues
On March 15, 2022, Dave Greene wrote: NewLifeCA 15 March 2022: Re: Gun collection on Catagolue
It is a bit strange at first, no argument there... From Catagolue's point of view, a glider gun is a "synthesis" of a period-N glider stream, and in this special case it knows that the relevant thing to count is not the number of gliders to build the gun, but rather the number of cells in its bounding box. This allows the same basic code to sort and display glider guns and object synthesis recipes, and replace old guns when new record-breakers turn up, even though the metric is different.Dean Hickerson wrote:It seems strange that this is done on the "syntheses" page, since a gun isn't a synthesis of anything.
An exploration of Catagolue will turn up at least one more instance of casual code re-use that's confusing at first but then comes to seem normal.
It's possible to run soups with various symmetries -- C4_4, D8_1, D2_+1, and so on -- as well as the "standard" random 16x16 C1 soups. There are also quite a few other categories like 2x128 soups, "inflated" soups that start with 2x2, 4x4, etc. blocks of ON cells instead of single cells, randomly generated glider collisions, and even "stdin" symmetries where people can pipe in any set of starting patterns that they want an ash census of -- partial spaceship search results, for example, just to see if Catagolue happens to record a new spaceship emerging from a partial.
Most of these categories generate starting patterns that aren't actually symmetrical in any way, but they're all classified as "symmetries" anyway, because that was the name of the category when Catagolue was first set up. By now everyone has gotten used to it and talks about "stdin symmetry" and so on without blinking an eye.
Keep the cheer,
Dave
Re: NewLifeCA Back Issues
On March 16, 2022, Dave Greene wrote: NewLifeCA 3/16/2022: CGoL Pattern of the Year voting time, and new record quadratic growth
I've mentioned the POTY 2021 nominations list before, but now it has been finalized and is a lot easier to look through -- and the voting has officially started.
There are now single links to stamp collections showing the new discoveries in each category, instead of nominations with dozens of unlabeled supporting links each:
Instructions for how to vote are at the bottom of the first post. You do have to have a forum account, though, and to get one of those if you don't have one, you have to answer a question about Life that seems to be beyond the capacity of most spambots / spambot handlers.
Quadratic-Growth New Records
In other news: as some of you already know, dani / danielle -- who is one of the moderators on the Conwaylife Lounge Discord server -- has been running some productive searches in the last few days, producing two successive record-breakers for low-population and small-bounding-box quadratic growth Life patterns.
The initial discovery was in a form like this --
-- which came from a program that dropped patches of random soup behind a couple of switch engines, and then piped all those experiments through apgsearch to see if any interesting new stuff came out. Quadratic-growth pattern, new 2-engine Cordership... you name it, if it's interesting, then probably apgsearch census code will notice it.Code: Select all
#C https://conwaylife.com/forums/viewtopic.php?p=142708#p142708 #C https://conwaylife.com/forums/viewtopic.php?f=2&t=5594#p142790 x = 63, y = 53, rule = B3/S23 33b3o$32bo3bo$32bo4bo$32bobo2bo$32bobob2o$29bo2bob2o$29bo2b2o$30b3o10$ 58bo$49bo7bobob2o$48b2ob2o2b2ob2o2bo$bobob3o2bobo2bo32bo5bobo5bo$ob3ob o2b3o2bo33bo8bo2b2o$2obob4ob2obo35bo2b3o2bo$o5bo3bob2o41b3o$o2b4o2b2ob obo$bo2bobo2b6o$o3bob3o2bo3bo$bo2bo2b4obob2o$3b2obobo2b3o$2bobo3b2o3b 3o$o3bo3b2o3bo$5b2o7b2o$b2ob5obo2bobo$b2o2b4obobob2o$2bo2b3ob3o3bo$2bo b3obo2b2o2bo2$23bobo2bo2b3obo$23bobo6b4o$24bob2obo2b4ob2o$26b2obob3obo 2bo$23b2ob2o2b2ob3o2bo$25b4o2b5o$23b2ob2o2b2obob3o$23bo2b3o3bo2b2obo$ 23b3obob2ob2o4bo$23bob2obob4o2bo$24bo2bo4b2ob2o$28b2ob2o3bo$24bo3bobob 2ob4o$23bo6bobobob3o$24bob9o3bo$23bobo2b3o!]
A couple of reduced versions followed, one with a 26x18 bounding box, and one with a population of only 22 cells -- breaking a fairly long-standing record set by switch engine ping-pong.
The version with an R-pentomino+glider was just a population-minimizing substitution to get the two switch engines into the right phases -- you can't just put in two 8-cell switch-engine predecessors, because the relative phases end up being wrong.
The same search program turned up another switch-engine-producing switch engine pair a few days later, which allowed for a 21-cell predecessor.
A few other non-record-breaking quadratic-growth patterns have also turned up, as well as a rediscovery of the 2-engine Cordership (twice so far: see the "xq96" category in Catagolue's sep_stdin symmetry.)
Keep the cheer,
Dave
Re: NewLifeCA Back Issues
NewLifeCA #12 forwarded messageOn March 23, 2022, Dave Greene wrote: NewLifeCA 3/23/2022: Life Day news, NewLifeCA Archive, and Fwd: Better 32x32 diehard
Happy Life Day, all! (3/23, you know -- *not* a Star Wars reference of any kind. Definitely not. Don't even look that up, it's bad for the digestion.)
See below for Dean Hickerson's new-record 32x32 27003-tick diehard. (!)
A few more news items:
1) A week ago, a relatively new user of the conwaylife.com forums assembled a new kind of puffer. I'm not sure if it can properly be called a "gliderless Gosper glider gun puffer", since the glider guns certainly produce authentic gliders -- but it's certainly a "glider-synthesis-less glider gun puffer", the first puffer in that category I believe.
2) Speaking of glider syntheses, last night and this morning Adam P. Goucher posted a set of recipes that allows for a huge simplification of the Reverse Caber Tosser method of constructing anything that's glider-constructible, using exactly 17 gliders in groups separated by super-astronomical distances. Discussion is ongoing on Discord and on the forum thread.
The diameter of the 17-glider pattern needed to build, let's say, Alan Hensel's decimal counter ... is not anywhere near calculable yet. It's many, many orders of magnitude smaller than it would have been if someone had asked yesterday, but an unknown but very large number of orders of magnitude still remain.
3) Nathaniel Johnston and I are just now closing down the Life textbook Kickstarter. It has collected more than double our target amount -- plenty enough to fund the next set of things we want to try doing to reach a wider audience with the book.
Among other things, I'll be passing out a lot of copies of the book PDF and pattern files on USB drives as part of G4G14's Gift Exchange, and spending some time in the G4G Exhibit Room with a laptop, just to see if anyone wants to discuss anything that might need a running copy of Golly as a prop.
We also just finished a Reddit event called an "AMA" -- "Ask Me Anything" -- which turned out very well, topping out at something over 2800 upvotes and attracting a very good number of interesting questions (and, we hope, answers) about Conway's Life and other CAs and CA-like models. Have a look if you're interested in seeing what a "wider audience" might look like:
https://www.reddit.com/r/IAmA/comments/ ... essor_who/
https://www.reddit.com/r/math/comments/ ... t_conways/
https://www.reddit.com/r/cellular_autom ... ok_launch/
It appears that Hacker News also allows AMAs, so after a little research, one of us might give that a try if we can find the time.
NewLifeCA Archive
There are getting to be enough of these NewLifeCA emails that it's getting difficult to send them all out to any late arrivals to the group. I'll be re-posting to some publicly accessible URL everything I've written to this group so far, and (with permission received from Dean already) also everything that Dean Hickerson has sent for redistribution to the group. Naturally I won't make the NewLifeCA email list visible or anything like that.
Most likely I'll make a "NewLifeCA" thread on the conwaylife.com forums, and will lock the thread so that the only thing that gets posted to it is NewLifeCA email "back issues". If anyone has any concerns about this, please let me know.
Final side note: anyone in this group who missed the last link to the Kickstarter but actually wants any of the items from the Kickstarter tiers, can of course feel free to contact me directly also.
Keep the cheer,
Dave
On March 23, 2022, Dean Hickerson wrote: Subject: Re: Better 32x32 diehard
Thanks to Dave Greene for the suggestion to use a c/7 loafer between the 2c/5 and c/10 instead of 2 c/3 spaceships. I finally found a way to make it work, and it's compact enough to be useful here. The pattern below fits more naturally in a 33x33 box, but some backtracking by lifesrc for the west edge and northwest corner squeezes it into 32x32:
Dean HickersonCode: Select all
#C 27003-tick diehard x = 32, y = 32, rule = B3/S23 3obob3o$4b2obob3o$2o2bo5bo$ob2ob2o3b2o$o2b2o2bo$2o3b4obo5b2o4b2o$3bo2b o3bo5b3ob2o2bo$3b3o15bobo$6bobo13bo$16bo8b3o$16b3o6b2ob2o$o3bobo4bo7bo 6bobob2o$2o2bo5b2o5b2o6b2o3b2o$bo3b2o3bo6bo7b2obob2o$4o6bo16b3o$bob4o 3b2o13bo$3b2o3b4o12b2o$3o4b2o12bo4bo$o3bo2bo3bo2b2o5bo4b2o$o3bo2bob2o 3bobo5b5o$2obobobo2bo4b2o8bo$b3o5bo$2o5bo$bo2bo3b3o3b2o4b2o5b2ob2o$2bo 4b4o3bobo2bobo4bobobo$b5obo2bo5bo2bo6bobo2bo$bo3bo10b2ob2o4b2ob4o$4bo 2bo11bo2bo2bo$4bob2o11bob2o4b2ob2o$2ob2obo8b2ob2obo6bobo$2obo2bo8b2obo 2bo5bo2bo$4b2o13b2o7b2o!
Re: NewLifeCA Back Issues
On April 7, 2022, Dave Greene wrote: NewLifeCA 4/7/2022: 20-cell quadratic growth, diereallyhards, Speed Orthogonoid, and more
I'm writing this from G4G14 in Atlanta, so there's not a lot of time for writing summaries at the moment! Here's a quick forward from an email from Adam P. Goucher, who has now joined the NewLifeCA email list:
There has been some further development of Dean Hickerson's engineered-diehard experiments on a dedicated conwaylife.com forum thread.Adam P. Goucher wrote:The record has been improved to 20 cells (also by Danielle), producing a BLSE every 11136 generations:
The upper-right component (11 cells) was one of exactly 400 seeds of the form R+(block or blinker)+(block or blinker) that gives rise to a glider-producing switch-engine, found by a day of searching on my laptop.Code: Select all
x = 97, y = 33, rule = B3/S23 94bo$92bobo$94b2o6$88b3o11$96bo$95b2o8$3bob2o$2bo3bo$bo$bo$obo!
The lower-left component (9 cells) evolves into a Herschel and unstable switch-engine, the latter of which is stabilised by interacting with the other switch-engine.
The longest-lasting engineered diehard is quite a bit larger than 32x32; the arbitrary line chosen by the first post was a 10,000-cell bounding box. Inside that limit, the current longest-lasting diehard posted by Pavel Grankovskiy this morning dies out sometime after 2 * 10^870 ticks (!)/
In other news, Goldtiger997 has completed an initial Speed Orthogonoid -- a self-constructing spaceship along the lines of the Speed
Demonoid, that can reach speeds approaching the c/2 orthogonal speed limit.
A pair of 44P5H2V0s recently showed up in a symmetric soup search -- the first c/5 spaceships to do so.
Keith Amling has assembled a c/2 orthogonal stretcher for a stable wick.
Other recent news can be found as usual on the LifeWiki home page, or in the News Archive.
Keep the cheer,
Dave
Re: NewLifeCA Back Issues
On April 14, 2022, Dave Greene wrote: NewLifeCA 4/14/2022: diesuperhards
A week ago I wrote:It turns out that the 10,000-cell bounding box limit is big enough to fit diehards that last unimaginably longer than that. Mechanisms inside 100x100 can actually support tetration.Dave Greene wrote:... the current longest-lasting diehard posted by Pavel Grankovskiy > this morning dies out sometime after 2 * 10^870 ticks (!)
The initial diesuperhard (not an official term, I just made it up) had a lifespan bigger than the eighth tetration of 121. Posts later in the thread explain the gradual improvements that were worked out to move the lifespan past 121^^12.
Here's a copy of the current best effort in two-state Life format, in case anyone is running a CA editor that doesn't get along well with Golly 4.0+'s LifeSuper:
The lifespan of this diesuperhard is bounded byCode: Select all
#N diesuperhard-12th-tetration #O Pavel Grankovskiy, 14 April 2022 #C This diehard has a lifespan on the order of the twelfth tetration of 121. #C https://conwaylife.com/forums/viewtopic.php?p=144204#p144204 x = 108, y = 92, rule = B3/S23 20b2o25bob4obobobo$19bo2bo24bo6bobo$20b2o27bo6bo$49b3o2bobo27b2o15bo$ 47bo10bo25b2o8b2o5bo$40b2o13b2o36bo2bo4bo$41bo52b2o8b2o$41bobo6b2o29b 2o21bobo$42b2o6bobo28b2o22bo$53bo7b2o$36b3o11bo2bo7b2o21b2o8bo$27b2o6b 3o15bo30b2o6b3o4b2o$27b2o13bo7bobo38bo7b2o$41bobo6b2o39b2o$42bo$20b2o 17bo5bo50b2o7b3o$20b2o6bo9bobo3bobo18bo30b2o6bobo$28b2o7bobo5bo3b2o13b obo37bo$28b2o6bobo3bo6b2o14b2o32bo2bobob2o$29bo5bobo3bobo9bo5b2o22bobo 13b2o3b2obo$34bobo5bo9bobo3bo2bo23bo17bobobo$33bobo17bobo3b2o20bobo21b 2o$32bobo19bobo24bo23bo$31bobo21bo24bobo$30bobo6b2o5b2o4bo27b2o$18b2o 3b2o4bobo7b2o5bo4bobo3b2o20bo$19b5o6bo13bobo5bo4bobo20b2o$19b2ob2o20b 2o12b2o13b2o6bo$19b2ob2o10b2o37b2o$20b3o4b2o5b2o$27b2o23b2o22b2o$52bo 23b2o$39bo10bobo13b2o$38bobo9b2o14bobo13b2o$18b2o4b2o5b2o4bob2o26b2o4b 2o6bobo4b3o$19bo4bobo4b2o3b2ob2o22bo9b2o6b2o5b3o$16b3o6b2o10bob2o21bob o13bo8bo3bo$16bo21bobo22bo6bo6bobo8b5o10bobo$28bo10bo29bobo4bobo10b4o 11b4o$27bobo39bobo3bobo24bob2o$22b2o4bobo39bo5bo6bo18bo4bo$24bo4bobo 25b2o8bo5bo7b3o18b3ob2o$21bo8bo25bobo7bobo3bobo5bo7b2o13b3obo$22b2o31b o2bobo6bo5bo6b2o6b2o12bo3b2o$40bo14b2o2b2o3bo5bo33bobo$17bo16b2o3bobo 10bo10bobo3bobo12bo17bo2bobo$17b3o8bo5b2o4bo10bobo10bo5bo7bo5bo18bobo$ 20bo7b2o22bo8bo5bo9b3o4bo$19b2o7b2o30bobo3bobo7bo3bo8bo$16bo12bo16bo 14bo5bo7bob3obo7bo$15bobo6bo20bobo10bo5bo11b5o8bo$14bo2bo6b2o20bobo8bo bo3bobo$14bobo7b2o21b2o9bo5bo$15bo3bo5bo35bo$18bobo39bobo$18bo2bo39bo$ 2bobo14bobo13bo33bo25b2o$2b2o4bo11bo9bo4b2o6bo25b3o22bo2bo$3bo3bobo6bo 13bobobobo5bobo27bo22bobo$6bo2bo6b2o12b2o10b2o5bo21b2o15b2o6bo$6bobo7b 2o30bobo29b2o6b2o$7bo3bo5bo31bo3b2o25bo$10bobo39bobo26b3o$10bo2bo25bo 12b2o29bo7b2o$3bo7bobo25b2o7bo42b2o9bo2bobo$b2o9bo26b2o6bobo53bobobo$ 2b2o4bo31bo7b2o38b2o14bo$8b2o78b2o17bo$8b2o95bo$9bo93b2o2bo$4bo7bob3o 10bo15b2o57b3ob2o$4b2o6bob4o7bobo15b2o4bo7b2o5bo37b2o3bo$bo2b2o6bo5bo 7b2o20bobo5bobo4bobo36bobob2o$5bo7bobobo2b3o26bo6bo6b2o38bo$obo11bobob 4o24bo8b2o45b3o2bo$2o5bo7bo2bob2o23bobo54b2obobo$4b2o2bobobo2bo3b3obo 18bo3bo$2bo2bob2o2bo4b3o2b2obo15b3o8b2ob2o14bo$3o8b2o9bo16bo11bob2o2bo 2b2o3bo4b2o$2bo4bo2bobo10bo2bo12b2o15b2o2b2o2b2o5b2o$o3bobob3o13bo2bo 37b2o4bo26b3o4bo$o3bo5bo14b2o3bo16b2ob2o14bo3bo26bo2bo4b2o$3o2bo3b2obo 13b5o16bob2o2bo43bo2bo2bobobo$2bobo2bob2o16b4o21b2o50b2obo$bob2o2bo2bo bo14bobo72bobob2o$4bo2b2o2bo14bob2obo11b2ob2o14bo2b2o23bo13bo$9bo2bo 13bo3bobo10bob2o2bo10b3o2b2o2bo16bob5o3b2o5b2obo$8b2o2bo13bo2bo2b2o14b 2o13b2o2b3o18b2ob2o4bo4bob2obo$4bo5bo16b2obob2o29b2o2b3o19b2o2b2o11bo$ 5b2o2b2o9bo8bo2b2o5b2ob2o19b2o6bo2bo9b2o2b2obo14bo$2o2bo3b2o11b3obo4bo 8bob2o2bo18bo6b3o10bo3b2ob6o2b2o$2o7bo9b6o6b3o10b2o39bo2bo3b5o2b2o!
121 ^^ 12 < T < 121 ^^ 13
or somewhat more precisely by
21 ^^ 13 < T < 22 ^^ 13
More detailed calculations can be found in this post.
Keep the cheer,
Dave
Re: NewLifeCA Back Issues
On April 15, 2022, Dave Greene wrote: NewLifeCA 4/15/2022: Speed Orthogonoid script, single-engine p36 gun, and rare C2_4 collidosocope
Here's a little more recent news that I didn't mention yesterday:
1) Goldtiger997 has completed a Golly script that makes it easy to build an orthogonal spaceship for any sub-c/2 speed.
These are quite a bit bigger than the equivalent Caterloopillars for speeds below c/4, but they do fill in a subset of missing speeds above (edited) c/4 that the current Caterloopillar-building script can't generate. That is to say, Caterloopillars with speeds of the form m/(8k+2) and m/(8k+6) are theoretically possible but no examples have been built yet, whereas Speed Orthogonoids have no such limitations.
2) A single-engine p36 gun has been assembled using the impressively versatile "traffic stop" reaction that has solved several other catalysis problems recently:
3) A new record has been set for long-lasting novelty in Catagolue/apsearch's standard-sized random symmetric soups:Code: Select all
#C p36 glider gun using just one copy of Jason's p36 #C This is the simple minimum-population version from #C https://conwaylife.com/forums/viewtopic.php?p=144146#p144146 #C -- for the smallest bounding box see #C https://conwaylife.com/forums/viewtopic.php?p=144164#p144164 #C or the LifeWiki article at #C https://conwaylife.com/wiki/Period-36_glider_gun . x = 50, y = 30, rule = B3/S23 33bo$28bo3bobo7bo$27bobo2bobo5b3o$27bob3o2b2o3bo$26b2o4b2o3bo2bo$2o23b o2b4o2b3o3bo$bo21bo2bobo3b3o3b2o9bo$bobo18bo4bo3bo3bo11b3o$2b2o18bo8bo bobo10bo$13b3o8b3o5b3o11b2o$13bo19bo$13bobo$14b2o$23b2o$23bobo20b3o$ 25bo17bo$12b3o8b3o16bobo$16bo28bo$11bo4bo26b2o$15bo$12b2o$12bo$12bo16b 6o$12bo14b2o6b2o$26bobobo2bobobo$24b3obo6bob3o$23bo3b2ob4ob2o3bo$24b2o 3bo4bo3b2o$26b2o2bo2bo2b2o$26bob2o4b2obo!
225,593,194 ticks is several times longer than the longest D8_4 collidoscopes that I know about. The above soup is equivalent to a couple of switch engines plus a small constellation:Code: Select all
#C A symmetric C2_4 "collidoscope" that stabilizes after 225,593,194 ticks #C ("yl4608_2_4870_7437a7f8139022277e706736421bde0f" on Catagolue) #C https://catagolue.hatsya.com/hashsoup/C2_4/c_mnZYdEB3FIdv459965563/b3s23 #C #C See also https://conwaylife.com/forums/viewtopic.php?p=86214#p86214 for a #C collection of stabilization times for the more common D8_4 collidoscopes. x = 32, y = 32, rule = B3/S23 18bo2bobo$17b7obo2bo$17b3ob2o2b2ob2obo$16b3ob2o3b7o$17bob2ob3ob2o2b2o$ 16b2o2bo2bob5obo$20bob4o3b3o$17bobob4ob2o$17b2o4b3ob4o$17b6obob2ob3o$ 21b2o3b2o$18b4o3b4o2bo$16b4o2b2o2bo$18b2o2b2o2b4o$16b5ob2o6b2o$17b2obo 3bobo3bo$bo3bobo3bob2o$2o6b2ob5o$2b4o2b2o2b2o$5bo2b2o2b4o$o2b4o3b4o$4b 2o3b2o$3ob2obob6o$b4ob3o4b2o$4b2ob4obobo$3o3b4obo$ob5obo2bo2b2o$2o2b2o b3ob2obo$7o3b2ob3o$ob2ob2o2b2ob3o$3bo2bob7o$8bobo2bo!
The two streams actually manage to drill past each other occasionally, especially in the first few million ticks. But of course that doesn't last terribly long, since a big explosion at the collision points will instantly interrupt the nearby streams coming from the other direction.Code: Select all
x = 46, y = 32, rule = B3/S23 32b2o$32b2o2$41bobo$41bo2bo$41bo2bo$44bo$43b3o2$30bo$29bobo$29bobo$30b o2$12b2o$12b2o8b2o$22b2o8b2o$32b2o2$15bo$14bobo$14bobo$15bo2$3o$bo$bo 2bo$bo2bo$2bobo2$12b2o$12b2o!
Maybe it would be interesting to investigate if anything like this can make a really long-lasting "true methuselah", actually stopping the switch engines after as long a delay as possible, along the lines of Paul Callahan's proof of concept 1.7-million-tick pattern from 2019.
Keep the cheer,
Dave
Re: NewLifeCA Back Issues
On April 24, 2022, Dave Greene wrote: NewLifeCA 24 April 2022: Build Anything Constructible with 16 Gliders, Tetration Revisited, and New Glider Guns
This news item showed up a couple of days ago: the 17-glider upper limit for constructing any glider-constructible pattern has now been reduced to 16 gliders.
The initial discovery was made by dani, who also engineered the20-cell quadratic growth pattern recently. A follow-up search by Oscar Cunningham ("Macbi" on the forums) produced several ways to add a single glider to dani's result and suppress all escaping gliders.
That is the only detail that's needed to complete an arbitrarily large RCT ("reverse caber tosser") synthesis with 16 gliders, because any stationary ash can be cleaned up as part of the construction process, at no additional cost in gliders -- just the usual very large cost in increased bounding box. Some gliders aimed inward at the "epicentre", along with the incoming GPSEs, can also be cleaned up by having the construction arm building expendable structures to catch them, before they actually arrive.
These cleanup mechanisms aren't documented yet, and in some cases aren't entirely invented yet -- but they can be built with the same basic slow-salvo method that constructed the shillelagh, in the pattern shown here.
The RCT's design has actually gotten quite a bit simpler since the 35- and 34-glider fixed cost designs. Written descriptions of the RCT mechanism are all out of date to one degree or another. It seems to be high time to write up a blog post with all of the details... but there are actually a lot of possible options to investigate for cleanup mechanisms, and it's not clear yet (at least to me) which design is the most efficient.
Here's a first effort at what is now looking like a series of three blog posts. These posts will probably all end up getting heavily edited over time as more refinements are made -- but that process may take a while.
Any questions or comments, let me know as usual!
Tetration Too
Also, speaking of blog entries, here's "Biggiemac" / Brett Berger's blog entry about tetration as applied to Conway's Life diehards, and (synchronistically / serendipitously) also to another game that taken up a lot of Brett's time recently:
https://btm.qva.mybluehost.me/telling-t ... etrations/
Glider Gun Progress
For anyone interested in new discoveries that *don't* involve any incomprehensibly large numbers, check out the gun-building threads on the forums. A lot of incremental progress has been made there recently, with some new search results hiding in the p14 and p16 pseudo-period guns and the true-period p28 and p114 guns, among many others.
Keep the cheer,
Dave
Re: NewLifeCA Back Issues
On May 2, 2022, Dave Greene wrote: NewLifeCA 2 May 2022: an unconstructible rotor, a new 2c/7 spaceship, quartermax, and more
Here are five Life discoveries from this last week.
1) Andrew J. Wade has found a new 2c/7 spaceship, with an entertaining hole in the middle:
2) Another interesting result came in from Ilkka Törmä and Ville Salo on April 27th: it's possible to find "self-forcing" patches of p2 agar. If these patches are present in any Life pattern at time T+2, they must also be present at time T:Code: Select all
#N 151P7H2V0, a new 151-cell 2c/7 spaceship #O Andrew J. Wade, 25 April 2022 #C https://conwaylife.com/forums/viewtopic.php?p=144727#p144727 x = 23, y = 42, rule = B3/S23 11bo$11bo$10bobo$11bo$11bo$5b4o5b4o$4bo3bo5bo3bo$3bo5bo3bo5bo2$7b2o5b 2o$4bo2bo7bo2bo$4bobo9bobo$4b2o11b2o$4b2o11b2o$b2o17b2o$3o17b3o$o2bo 15bo2bo$2ob2o13b2ob2o$3bo15bo3$b3o15b3o$bobo15bobo$bo2bo13bo2bo$b2ob2o 11b2ob2o$2bobo13bobo$3bo15bo2$5b3o7b3o$7bo7bo$3b4o9b4o$3bo15bo$10b3o$ 8bo5bo$7bo7bo$4b2obo3bo3bob2o$4bo4bo3bo4bo$5bo5bo5bo$5bo11bo$6b3obobob 3o$9b2ob2o$5b2o9b2o!
These patches can form part of a period-2 oscillator, and therefore we now know that there exist oscillators with non-glider-constructible rotors.Code: Select all
x = 30, y = 19, rule = LifeHistory .DC2D3C2DCDCDC2D3C2DCD$D.D2C3D2CDCDCD2C3D2CDCDC$D.CDC3DCDC3DCDC3DCDC 3D$DCDCDC2D2CDCDCDCDC2D2CDCDCD$.DCDCD2C2DCDCDCDCD2C2DCDCDCDC$.C3DCDC 3DCDC3DCDC3DCDC3D$.DCDCD2C3D2CDCDCD2C3D2CDCDCD$DCDCDC2D3C2DCDCDC2D3C 2DCDCDC$2DCDC3DCDC3DCDC3DCDC3DCDCD$2D3C3D3C3D3C3D3C3D3CD$2C3D3C3D3C3D 3C3D3C3DC$DC3DCDC3DCDC3DCDC3DCDC3DC$CDC2D3C2DCDCDC2D3C2DCDCDC2DC$DCD 2C3D2CDCDCD2C3D2CDCDCD2CD$2DCDC3DCDC3DCDC3DCDC3DCDCD$DCDCDC2D2CDCDCDC DC2D2CDCDCDCDC$.DCDCD2C2DCDCDCDCD2C2DCDCDC2.D$2.3DCDC3D3.3DCDC3D3.3D$ 2.CDCD2C2D4.CDCD2C2D!
(We already knew that non-glider-constructible oscillators existed, because oscillators can easily be constructed with stators that include non-glider-constructible still lifes. But until now, the rotor wasn't the thing that made oscillators provably non-constructible.)
The current smallest known oscillator containing the unsynthesizable patch can be found here. Scroll up to the parent post for the two-state version.
3) On April 28th, wwei47 turned up a new record-smallest period-12 backrake:
4) On May 2, iNoMed completed yet another period-46 gun with a never-before-seen engine mechanism:Code: Select all
#N p12 backrake #O wwei47, 28 April 2022 #C This is a 34-cell predecessor of the rake, #C which has a minimum population of 39 cells. #C https://conwaylife.com/forums/viewtopic.php?p=144830#p144830 x = 20, y = 6, rule = B3/S23 9bo7bo$b3o4b3o5b3o$o2bo3bo2b2o4bob2o$3bo3bo3bo5b3o$3bo4b2o2bo4b2o$obo 8bo!
5) Also on May 2, Keith Amling filled in the last piece of the puzzle to complete a "quartermax" spacefiller.Code: Select all
#N "Tamale" #O iNoMed, 2 May 2022 #C A p46 gun not based on twin-bees shuttles, glider loops, or Kazyan's p46 #C https://conwaylife.com/forums/viewtopic.php?p=144982#p144982 x = 30, y = 31, rule = B3/S23 13b2o$8b2o3bo2bobo$2o5b2o6b2ob3o$bo7bo11bo$bobo11b2ob3o$2b2o11b2obo2$ 20b2o$20bo$18bobo$2o5b2o9b2o$2o5bobo$7bobo$8b2o4$20b2o$20bobo$20bobo5b 2o$10b2o9b2o5b2o$9bobo$9bo$8b2o2$11bob2o11b2o$9b3ob2o11bobo$8bo11bo7bo $9b3ob2o6b2o5b2o$11bobo2bo3b2o$15b2o!
Keep the cheer,Code: Select all
#N quartermax #O Keith Amling, 2 May 2022 #C https://conwaylife.com/forums/viewtopic.php?p=144986#p144986 x = 133, y = 112, rule = B3/S23 bo$3o5b3o12bo5bo$ob2o4bo2bo4b3o3b3o3b3o$b3o2bo9bo2bob2obo3bob2o$b3ob2o bo3bo2bo2b2ob3o5b3o$b2o3bobo2b2o2b5o2b2o5b2o$11b2o9b2o$12bo3bo3bo2bo2b 2o37b3o$17bo2b2obo7b3o24b3o3bo2bo$12b4o3b2o6bo3bo2bo6b3o3b3o8bo2bo5bo$ 11bo2b3o4bo2b4o3bo2bo6bo2bo2bo2bo7bo8bo$12b2obobobo2bobo5bo3b2o4bo3bo 2bo10bo3bobobo$10bo4bo3bobob2o2bo3b3o2b2o2b2ob2o3bo2bo3bo2bo$10bo4bo8b 5o3b2ob3ob2o8b3o2b3obo3bo7b3o$14b2o12bo5bo4b2o3b5o2b2obo3bo3b2o6bo2bo$ 6bo3bobobo13bo5b2o7bo4b4obobo2b3o2bo6bo$5b3o3b2obo19b3o3b2o2bo4bo3bobo 6bo2bo4bo$4b2obo4bo27b5o5bo2bobo2b4o4b2o3bobo$4b3o3b6o21b2obob2o2b4o6b o11bo$5b2o3bo3b2o17bo4bobobob2o9bob4obo$15bo16b2ob2obobo3bobo4bo4b2ob 2o3b2ob2o32bo7bo$14bo14bo2b3o3bob3obobo10bo2bo3bobo33b3o5b3o7b3o8b3o$ 14b2o12b3obo5bob2o2bobo2b2o7bobo3bo19b3o5b3o5bob2o3b2o2bo6bo2bo7bo2bo$ 11bo3bo11b2o2b2o5b3ob6o2b3ob2o2bobobo3b2o3b3o3b3o4bo2bo4bo2bo5b3o3b3ob o6bo10bo$10b3o14b2ob2o6b3o2bo2b2o2b2obob3obo2bo7bo2bo3bo2bo2bo8bo2bo5b 2obob2obob2o5bo3bo6bo$9b2ob2o13b2o2b2ob3obo12bo9b3o2bo3bo3bobo3bo2b3o 2bo2bobo3bo3bo3bo3bobob2o3bo3bo7bobo$8b2o21bob2o2bo4bo8bob2o6b3o4bo3bo bobobo2bob2o5b3o5b2o9bobo2b4o4bob4o$7b2o18b2o5bo26b3o3b5obo2bob5o2b3o 2b2obo4b2obo5bobobo2b6ob2ob2o2bo$8bo25bo26b3o2bo25b3obobobob5o2bobo10b o3bo$7b2o28bo23b2o4b22o7b2o3b2o2b2o7bobo5bobo$5b2obob2o18b6ob2o53bo8b 2o2b2o5bo8b3o$6bobo2b2o16b2obo4b2o28b22o12bo4bo14b2o$3b2obo2bo2bo16bob 2ob4o28bo22bo31b2o2bo$3b2obo5b2o19b4o30b23o35b4o$3bobo22bob2ob3o55bo 35b2o$2b2ob2o20bo2bo36b25o38bo$27bo4b2o32bo26bo33b4o$33bo33b27o37bo$ 27bo67bo31bo2b3o$26b2obobo2b2o31b29o33b3o$27bo6b3o29bo30bo32bo$26bo2bo 6bo30b31o27bob3o$27b3o3bo65bo25b2o2bo$27b3o3bo2bo30b33o26b3o$35bo30bo 34bo24bo$67b35o26bo$29bo73bo22bobo$28b2o37b37o25bo$28b6o32bo38bo20bobo $28b4o2bo32b39o22bo$27bo3bo3bo71bo18bo$28b2o5bo31b41o18b3o$33bo32bo42b o15b2o2bo$34bobo30b43o15bob3o$30b3obob2o73bo18bo$30bo3bobobo28b45o17b 3o$36bob2o26bo46bo13bo2b3o$29b2o5bo3bo26b47o17bo$115bo11b4o$36b2ob2o 26b49o14bo$35bo5bo24bo50bo9b2o$36bo3bo26b51o5bob4o$119bo2bob2o$67b20ob 32o2b2o$66bo19bobo32b2o$67b19o3b33o$71bo2bo$67b3o6b8o3bo3b33o$67bo2b6o 8bobobobo32b2o$65bobobo5bob3ob4obobob4ob4o2b4o2b4o2b4o2b3o2b2o$64bob2o 2bo3b2o2b2o6bobo6b2o2bob2o2bob2o2bob2o2bob3o2b3o$64bo4bobo5bo5b2obobob 2o5bo5bo5bo5bo7bobo$63b2ob5ob2o11b2ob2o32b3o$63bo2bo2bo6bo5bo4bo4bo28b 2o2bo$64bobo4b5o6bob2obob2obo24bo2b3o$65bo3bobo14bobo28bo2b3o$69b2o3b 2o8bobobobo28bo7b2o$74b2o4b2obo2bobo2bob2o24b2ob5ob2o$80b2o2bobobobo2b 2o22bob3ob6o$86bobo22b2obob3o2bo3b3o$85bo3bo23b2obob2o$110b2o9bo$84b2o 3b2o16b2obo2bob3obo2b2o$83bo7bo15b2ob2obobo2bo4bo$83b4ob4o16bob3o5b2o 3bo$111b2o7b3o$84bobobobo$77bo3b3o2bobo2b3o3bo$76bobobobob2o3b2obobobo bo$76bobobo3bo5bo3bobobo$77bobo3bo2b3o2bo3bobo$79bobo4b3o4bobo$79b2o6b o6b2o$86bobo$82bo2bobobo2bo$82b4obob4o$86b3o$84bo5bo$83bob2ob2obo$83bo 7bo$80b2obob2ob2obobo$80bobo3bobo3bobo$83b2o5b2o2bo$85bo3bo2b2o$83b2ob obobo$82bo2bobobob3o$82b2obo3bo3bo$85bo2bobobo$82b2obo2bob2o$83bobobob o$83bobobobo$84b2ob2o!
Dave
Re: NewLifeCA Back Issues
On June 5, 2022, dvgrn wrote:NewLifeCA 5 June 2022: RCT progress, CatForce improvements, and oscillator discoveries
June already! Time for another somewhat miscellaneous CGoL news summary.
1) New oscillator discoveries have continued. Part of them are due to the continuing work of David Raucci / hotdogPi and his script that adds experimental sparks to arrangements of common active objects. Many, but not all, of the rest come from Charity Engine, which continues to run symmetric soups in impressive numbers (though not quite as impressive as during the initial surge).
To see the full collection of new oscillators, follow the links as usual in the LifeWiki news page.
A few of the highlights include
-- a useful small p7 sparker called "meatball". The gallery in the LifeWiki article shows off some of its uses better than I can in an email.
-- several new SKOPs, including these at p25 and p84:
"SKOP{n}" is a relatively new term, in common enough use now that it ought to go in the Life Lexicon. It's short for "Smallest Known Oscillator of Period {n}", and there's a dedicated repository for keeping track of them, maintained by Jeremy Tan.Code: Select all
x = 64, y = 20, rule = B3/S23 o59bo$3o55b3o$3bo53bo$2bo26b2o26b2o$2bo2bo24bo$30bobo17bo$6b2o23b2o15b 2obo$7bo39bobo$5bobo39bo$4b2o$14b2o$12bobo30bo$12bo30bobo$12b2o27bob2o 15b2o$42bo17bobo$14bo2bo44bo$17bo16b2o26b2o$16bo18bo$17b3o12b3o$19bo 12bo!
The Skopje collection is one of the current litmus tests for new discoveries, along with the glider syntheses and gun collections on Catagolue. If a just-discovered mechanism can be used to set a new record in one of these places, then the odds are good that it's really a new discovery, not a re-discovery or an uninteresting variant of something already known.
2) The glider-guns thread on the forums is a good place to see some recent applications of new technology along the above lines. Here for example is a pseudo period-19 gun getting squashed into an almost reasonable bounding box.
The first pseudo-period p19 gun was a 450x281 construction by Karel Suhajda in 2003. It has been gradually reduced over the years, and now fits inside 169x136, less than a fifth of the original size:
3) A few days ago (2 June) Hartmut Holzwart, Keith Amling, Matthias Merzenich collaborated to complete a new greyship front edge that allows for the construction of rectangular and trapezoidal greyships that mix different widths of chicken wire with a minimum width of 13.Code: Select all
x = 644, y = 281, rule = B3/S23 223bo35b2obo7bo$221b3o35bob2o7b3o$220bo52bo14bo$220b2o50b2o12b3o$232bo 52bo30b2o$232b3o50b2o28bo2bo$235bo74b2o2bob2obo$190b2o42b2o9bob3o60bo 3bo2bobo$191bo51b2obo3bo33b2o25b3obo3b2o$191bobo50bo4b2o14b2o17b2o27bo bobo2bo$192b2o2b2o47b4obo14b2o46bo3b3o$196b2o20bo4bo$214b2o2bo4b2o2b3o 47bo26b2o7bo2b4o2b2o$213bo5bo5bo50b3o25bo8bo6bo2bo$212b2o2bobo4b2o50bo 2b2o25bo2bo5b2o3b2obo$213b2o3bo7bo47b4obo27b2o6bo5bob3o$214b3o5b2o3bo 40b2o4bo4bo27bo3b2o8bo4bo$222b2ob2o21b2o19bo5b2o2bo26bo4b2o7b2ob2ob3o$ 84b2o162bobo15b3o7b2o28b2o10bo3b2obo3bo$83bo2bo163bo15bo47bo6bo5bo2bo$ 82bob2obo2b2o146b2o10b2o19b2o8bo31bobobo3bo4b3obo$82bobo2bo3bo146bo33b o6bobo27b2o2b2o7bo2bo4bobo$81b2ob3ob3o99b2o36b2o9b3o27b3o8b2o27b2o8bob 3obobobob2o$81bo2bobobo100bobo16b2o19bo11bo27bo53bobo3bo$82b2o105bo18b obo17bo92b2o2bobobo$87bo100b2o20bo17b2o92bobobobo$78b2o2b3ob2o8b2o99b 3o4b2o4b2o110bobo2bo$78bo2bo3bobo7bobo98b2o2bo3bobo116b2o$79bob2o2b2ob o7bo98bo3b2o5bo$76b3obo11b3o99bo2b3o6b2o54b2o$75bo4bo9b4o99bo2b2o65bo$ 73b3ob2ob2o6bobo2bo2bo76b2o18bo2bo66bobo15b2o58b2o$72bo3bobo3bo11b2o 76bo2bo18bo2bo66b2o15b2o54bo2bobo$71bo2bo7bo4bo79b2o2bob2obo17bo2bo 105b3o30bo4bo$71bob2obobo3bo3bobo78bo3bo2bobo18b3o107bo30bo2bo$69bobo 10bo4b2o2b2o75b3obo3b2o7b2o117bo32b3o$69b2ob2ob2obob3o8b2o13b2o62bobob o2bo8bo121b2o22b2o4b2o$72bobobobo2bo24bo63bo3b3o9bobo118bobo2bo15bo3b 2o4bo8b2o$72bobobo2b2o26b3o77b2o118bobobobo12bobo8b2o7bobo15b2o$73bobo bobo24b3o3bo50b2o7bo2b4o2b2o125b2o2bobobo12b2o17bo16bo2bo$74bo2bobo23b o4bo2bo49bo8bo6bo2bo124bo2bobo3bo18b2o2bo2bo4b2o11b2o2bob2obo$77b2o23b obobob2obo50bo2bo5b2o3b2obo92b3o19b2o10bobobo2b2ob2o15bobo5b3o3b2o9bo 3bo2bobo$103bo4bo2b2o51b2o6bo5bob3o92bo18b2o2b2o5bo2b3o4bobo16bo5bobo 2b2o2bo9b3o2bo2b2o$104b4o2bo2bo50bo3b2o8bo4bo88bo2bo22bobo5b2o3b3obo 24b2o4bobobo10bobobo2bo$81bo19b3o7bobo49bo4b2o7b2ob2ob3o87b2o7b2o15bo 6bo5bo2bo26bo2b4obo12b2ob2o$79b2o20bo3b2o3b2obob2o46b2o10bo3b2obo3bo 20b2o64b2o7bobo6b2o12bo2bobo3bo27bobo4bo13b2o$80b2o20b3ob2o2bo3bobo54b o6bo5bo2bo19bo64bo2bo8bo6bo4b2o7b2ob2ob3o18b5o3bobobob3o3b2o9bo2b2o2b 2o$104bobob2ob3o56bobobo3bo4b3obo17bobo64bo11b2o5b3o2b2o8bo4bo19b2o4bo 2b2o3b2o5b2o9bobo2bo2bo$111bo2b2o3b2o31b2o12b2o2b2o7bo2bo4bobo15b2o67b 2o15b3o5b2o5bob3o19bobo4b3o14bobo4bo5b2obo$106bo7bobobob3o30bo12b2o8bo b3obobobob2o102b2o5b2o3b2obo20b3o9bobo14bo3b3o5bob3o$110bo5bobo4bo26b 3o27bobo3bo102bo8bob3o2bo2bo18bo3b2obob2obob2o10bo2bo2b3o7bo4bo$86b2o 20bo7bob2ob2obo24bo3b3o22b2o2bobobo22bo79b2o11b3o2b2o18b3o7bobo13bo2bo 2b2o7b2ob2ob3o$87bo17b3o8bo5bobo23bo2bobo2bo22bobobobo22bobo90bo28b3ob obo2bo14b2o12bo2bobo3bo$84b3o17b5o4b2o4b2o2bo24bob2o2b2obo21bobo2bo23b obo88bob4o24bo2bo4b2o23bo5b2o5bo2bo$83bo3b3o13b2obo2bo4bo6b2o24b2o4bo 2bo23b2o25b2ob3o78b2o5bo3bo2bo22bob2o2b2obo23bobo4b9obo$82bo2bobo2bo 13b5o6b2ob3o25bo2bobob3o57bo77bo4b3obo3b2o23bo2bobo2bo19b2o2b2o5bo2bob o4bobo$82bob2o3bobo14b2o3b2o7bo25bobo7b3o18bo29b2ob3o59b2o15bobo3bo3bo 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4) There has been quite a bit of progress in sorting out the specifics of a 16-glider RCT construction. Here's a Part 2 RCT summary article giving some more details.Code: Select all
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Long story short, Pavel Grankovskiy constructed an actual recipe for the first "bootstrap" stage of the RCT, and also pointed out that the second bootstrap stage can be accomplished very much less expensively than we thought. The original plan needed a huge piece of circuitry to do static storage and retrieval of data, but all that was really needed was a big glider loop.
Most of what's left to figure out is some remaining details of the cleanup process. Many of the parts of RCT design that seemed really difficult in previous versions are already complete in the 16-glider blueprint. (!)
For example, there's now a known set of four cleanup Corderfleets, totalling 72 Corderships, and that number can probably be reduced a bit. The Corderfleets can clean up all of the long lines of ash from the four incoming glider-producing switch engines.
The Corderships can be built one at a time, with no synchronization needed besides making sure that the ones that clean up blinkers have the right parity (i.e., start on an even tick or on an odd tick, depending on the phase of the blinker).
Re: NewLifeCA Back Issues
On June 5, 2022, dvgrn wrote:NewLifeCA #19, 5 June 2022: CatForce improvements, and an almost p19
In the last message, I didn't actually mention the coding improvements to Michael Simkin's CatForce search program as promised in the subject line. The revised version of CatForce helped to make some of the discoveries that I described.
CatForce was originally written in 2015, as a brute-force catalyst search tool. Rather than trying known catalysts in likely positions (like catalyst/catfind/catgl or ptbsearch) or trying to invent new catalysts for specific situations (like Bellman, or sometimes JLS/WLS/lifesrc), CatForce just enumerated all possible arrangements of catalysts from its list of stable objects, and ran them all as quickly as possible to see if any of them happened to work.
A large number of discoveries and constructions since 2015 have been made possible or improved by CatForce, starting with the B60 Herschel conduit that makes up the Simkin glider gun.
The p84 oscillator from the previous message was found with an optimized version of CatForce. The code update was completed recently by forum user mvr, with an added option for symmetric searches -- i.e. adding the same oscillator simultaneously in multiple locations around a symmetrical initial reaction.
One of the first discoveries with the new symmetric-search CatForce was this Spartan H-to-4G converter:
We already had a known H-to-4G converter with the same rather unwieldy systemic name of "PNE-6T40_SE-6T40". It used a 27-cell catalyst to convert a pi heptomino into a symmetrical pair of gliders:Code: Select all
x = 41, y = 26, rule = B3/S23 14b2o$14b2o23bo$38bobo$39bo3$2o$bo35bo$bobo32bobo$2b2o32bobo$37bo2$37b o$36bobo$36bobo$37bo$2bo$2bobo$2b3o$4bo34bo$38bobo$14b2o23bo$14b2o2b2o $18bobo$20bo$20b2o!
The new Spartan version is much more usable in self-constructing circuitry. Pavgran was able to incorporate it into the DBCA ("Decoder and Better Construction Arm") device in his first-stage RCT bootstrap recipe.Code: Select all
x = 45, y = 27, rule = B3/S23 $14b2o$14b2o4$40bo$2o37bobo$bo37bobo$bobo34b2ob2o$2b2o33bo2bo2bo$36bob obobobo$37bobobobo$39bobo$39bo2bo$40b2o2$2bo$2bobo34b2o$2b3o34b2o$4bo 2$14b2o$14b2o2b2o$18bobo$20bo$20b2o!
A P19 Near-Miss
\One suggested problem for the new symmetric-search CatForce to tackle was this almost period-19 oscillator:
To the left is the original form. The glider-supported version in the middle shows what the p19 reaction would look like. To the right are some increasingly unlikely attempts from the forum thread, to find alternate supports for the reaction.Code: Select all
x = 169, y = 85, rule = B3/S23 54bo39bo38bo9bo$52bobo39bobo36b3o5b3o$53b2o39b2o33b2o5bo3bo$130bo4b2o 3b2o$129bo16b2o$57bobo29bobo37b2o6b3o6bo$58b2o29b2o40bo4bo3bo3bobo$58b o31bo38b3o3bo5bo2b2o$128bo5bo3bo3bo$63bo21bo42b2o4bo2bobo2bo4b2o$64bo 19bo49bo3bo3bo5bo$62b3o19b3o44b2o2bo5bo3b3o$41bo65bo22bobo3bo3bo4bo$ 42bo63bo23bo6b3o6b2o$40b3o24bo13bo24b3o20b2o16bo$68b2o9b2o57bo6bo$12b 2o5b2o46b2o11b2o55bobo5b2o$13bo5bo25bo57bo23b2o8bobo$12bo7bo25b2o53b2o 24b2o9bo$12b2o5b2o24b2o26bobo26b2o$71bobobobo$14bo3bo53b2ob2o83b2o$12b 2obobob2o30bo45bo37b2o3b2o18bo$12bo2bobo2bo28bobo20bo3bo20bobo34bobo3b obo19bo$14bo3bo31b2o18b2obobob2o18b2o35bo2bobo2bo15b5o$10bob2o5b2obo 47bo2bobo2bo56b2o3b2o16bo$9bo2bo7bo2bo48bo3bo59bo3bo20b2o$54bobo11bob 2o5b2obo11bobo35b2o13b2o13b2obo$ob2o2b2ob2o11b2ob2o2b2obo22b2o10bo2bo 7bo2bo10b2o35bo2bo11bo2bo10b3o2bo$2obo2bo2bo13bo2bo2bob2o22bo37bo35b2o b2o9b2ob2o9bobo2b2ob2obo$5bo2bo15bo2bo36b2ob2o11b2ob2o34b2o2b2o6bo13bo 6b2o2bo8bob2o$6b2o17b2o33bo3bo2bo13bo2bo3bo31bobo2bo25bo2bobo8bo$61bob o2bo15bo2bobo31b2o2b2o6bo13bo6b2o2bo3b2o2b2o$6b2o17b2o32b3o2b2o17b2o2b 3o39b2ob2o9b2ob2o9bo2bo$5bo2bo15bo2bo101bo2bo11bo2bo10b3o$2obo2bo2bo 13bo2bo2bob2o26b3o2b2o17b2o2b3o40b2o13b2o$ob2o2b2ob2o11b2ob2o2b2obo28b obo2bo15bo2bobo48bo3bo12b2o$60bo3bo2bo13bo2bo3bo46b2o3b2o11b2o$9bo2bo 7bo2bo40b2ob2o11b2ob2o49bo2bobo2bo$10bob2o5b2obo32bo37bo40bobo3bobo$ 14bo3bo36b2o10bo2bo7bo2bo10b2o41b2o3b2o19bo2bo$12bo2bobo2bo33bobo11bob 2o5b2obo11bobo66b4o$12b2obobob2o51bo3bo81bo$14bo3bo51bo2bobo2bo79b5o$ 50b2o18b2obobob2o18b2o40bo22bo$12b2o5b2o28bobo20bo3bo20bobo37b2o21bo$ 12bo7bo30bo45bo41bo20b2o$13bo5bo52b2ob2o$12b2o5b2o50bobobobo$45b2o26bo bo26b2o$46b2o53b2o$45bo57bo$67b2o11b2o$68b2o9b2o$40b3o24bo13bo24b3o$ 42bo63bo28b2ob2o$41bo65bo28bobo$62b3o19b3o$64bo19bo50bo3bo$63bo21bo48b obobobo$133b2obobob2o$58bo31bo42bobo3bobo$58b2o29b2o40b3o7b3o$57bobo 29bobo38bobo9bobo$130b2o11b2o$128b3o13b3o$53b2o39b2o31b2o17b2o$52bobo 39bobo25bo3bo2bo15bo2bo3b2o$54bo39bo25b2ob2o2b2o17b2o2b2obo$120b2ob2o 25b2o$120b2ob2o2b2o17b2o2b2obo$122bo3bo2bo15bo2bo3b2o$127b2o17b2o$128b 3o13b3o$130b2o11b2o$130bobo9bobo$131b3o7b3o$133bobo3bobo$133b2obobob2o $134bobobobo$135bo3bo2$136b3o$137b2o$138bo!
If CatForce (or Bellman or JLS or some other search program yet to be invented) could find a way to turn one of these supports back into a copy of itself, in exactly 19 ticks, then we'd be another step closer to proving that Life is omniperiodic.
Unfortunately at the moment it looks as if any search program powerful enough to solve this could probably also find other p19 oscillators just as easily! For example, we already have a known 7-step two-cell traffic light push, so if we had a known way to push a traffic light back two cells in exactly twelve ticks, we would already have built a p19 oscillator.
... Still, at the rate we're going, it does seem like we'll find our way to omniperiodicity someday!
Keep the cheer,
Dave
Re: NewLifeCA Back Issues
On July 2, 2022, dvgrn wrote:NewLifeCA #20, 2 July 2022: RCT correction and update, plus many more new oscillators
RCT Update
I wrote in NewLifeCA #18, 5 June 2022:This needs a minor correction. I had missed one of the timing options in the northwest. One of the surplus NW-traveling gliders generates a retrograde glider and a moderate-sized cloud of ash, in one of its of its two 0|128 mod 256 timings.
The retrograde glider's effects were already handled correctly by the 50-Cordership fleet, down in the southeast GPSE's ash, but the ash clouds in the northwest weren't accounted for. It turned out to be possible to use a subset of 34 out of the 50 Corderships to do the cleanup in the NW -- making a total of 50+34+ 2*11 = 106 Corderships in the four Corderfleets (or three Corderfleets, depending on how you count them).
Meanwhile, a lot of progress has been made on other parts of the RCT design. Adam P. Goucher has completed a secondary "extreme compression" mechanism intended for helping with both construction (in the far northwest) and cleanup (in the center). This is an optional second level of bootstrapping, but it allows for easy solutions to a couple of things that are otherwise either expensive or awkward, or both.
Long story short, it seems worth including an ECCA (Extreme Compression Construction Arm) in the standard RCT design, because it will reduce the total size of most or all RCT recipes, *and* reduce the amount of effort it takes to complete a working RCT demo. We're now gradually closing in on a complete working demo of how to build Alan Hensel's decimal counter from 1994, using only 16 gliders.
New Oscillators
The most recent discovery is "Charity's p16" from a couple of days ago, a new p16 oscillator from a Catagolue soup search, with a fairly impressive spark:
Before that, ljkiernan1 used the symmetric-search option in the new version of Michael Simkin's CatForce to find new smallest-population p37 and p58 oscillators. This allowed for the creation of record-breaking p37 and p58 glider guns, as shown in the oscillators' respective LifeWiki articles.Code: Select all
#C https://conwaylife.com/wiki/Charity%27s_p16 x = 12, y = 12, rule = B3/S23 4b3o3b2o$bo2b3o3b2o$obo2b2o$bo3$6b2o$4bob2o$3bo$6bo$2b2obo$2b2o!
Code: Select all
#N 58P37 #O ljkiernan1, 24 June 2022 #C p37 R-pentomino hassler x = 27, y = 24, rule = B3/S23 8bo$8b3o14b2o$11bo13bo$10b2o11bobo$23b2o$15b2o$15b3o$14bo2bo$15b2o$2o$ bo$bobo19b2o$2b2o19bobo$25bo$25b2o$10b2o$9bo2bo$9b3o$10b2o$2b2o$bobo 11b2o$bo13bo$2o14b3o$18bo!
There have been incremental improvements and occasional big reductions to quite a few glider guns lately, showing that gradualism and saltationism both have their place in gun-collection evolutionary theory.Code: Select all
#N p58 pi-heptomino hassler #O ljkiernan1, 26 June 2022 #C Found using a symmetric CatForce search. x = 23, y = 30, rule = B3/S23 7bo$5b3o$4bo$4b2o6b2o$12bo$10bobo8b2o$10b2o9b2o3$2b2o$bobo$bo$bobo$2b 2o3$19b2o$19bobo$21bo$19bobo$19b2o3$2o9b2o$2o8bobo$10bo$9b2o6b2o$18bo$ 15b3o$15bo!
New Spaceship Syntheses
Goldtiger997 has been gradually working through a series of difficult synthesis problems. Among the most recent results are a synthesis for 30P3H1V0 in 24 gliders --
-- and a related synthesis for 29P3H1V0 in 35 gliders, meaning that all known spaceships up to 31 bits now have a glider synthesis:Code: Select all
#N 24-glider synthesis of 30P3H1V0 #O Goldtiger997, 16 June 2022 x = 439, y = 95, rule = B3/S23 430bo$418bo9b2o$418bobo8b2o$418b2o7$362bobo$363b2o$363bo51bo$369bo44bo $370b2o42b3o$369b2o14$432bo$432bobo$432b2o8$283bo$284bo9bo$282b3o7b2o$ 293b2o$390b2o$389bo2bo$192bo196bo2bo$2bo86bobo3bo96bobo195b2o$obo87b2o 4bo95b2o$b2o87bo3b3o$104b2o98b2o98b2o98b2o$104bo91b2o6bo91b2o6bo91b2o 6bo$3b2o100b3o89bo7b3o81b2o6bo7b3o81b2o6bo7b3o$4b2o87b2o12bo88bo10bo 80bo2bo4bo10bo80bo2bo4bo10bo$3bo90b2o100b2o90bobo5b2o90bobo5b2o$93bo 195bo99bo$184b3o226bo$186bo226b2o$92b3o90bo226bobo3bo$94bo322b2o$93bo 323bobo5$392b2o$391bobo$393bo12$409b2o$409bobo$409bo5$436b2o$369b3o64b obo$371bo64bo$370bo52b3o$423bo$424bo2$374b3o$376bo$375bo!
Other recent constructions include an 18-glider recipe for a p32 c/2 orthogonal spaceship, and recipes for various c/4 spaceships, including two or three working together escorting toads.Code: Select all
#N 35-glider synthesis of 29P3H1V0 #O Goldtiger997, 30 June 2022 #C https://conwaylife.com/forums/viewtopic.php?p=147675#p147675 x = 649, y = 62, rule = B3/S23 639bo$638bo$638b3o10$584bo$582bobo$135bo447b2o6bo31bo$135bobo454bo30bo bo$135b2o453b3o30b2o$618bobo$618b2o$606bo12bo$604bobo$605b2o39bobo$ 586bo59b2o$584bobo60bo$11bo573b2o$9b2o$10b2o5$646bo$3bo299bo341bo$2bo 298b2o342b3o$2b3o291bobo3b2o$297b2o335bo$121bo175bo104b2o98b2o98b2o30b obo$104b2o14bo83b2o98b2o96bobo97bobo97bobo29b2o$104bo15b3o81bo99bo100b o99bo84b2o13bo$106bo99bo2b2o95bo2b2o95bo2b2o95bo2b2o80b2o13bo2b2o$105b 2o98b2o2bo2bo92b2o2bo2bo92b2o2bo2bo92b2o2bo2bo77bo6bo7b2o2bo2bo$2bo 101bo95bo3bo6b2o91bo2b2o2b2o91bo2b2o2b2o91bo2b2o2b2o85bo5bo2b2o2b2o$2o 103bobo8bo84bo3bobo96b2o98b2o98b2o90b3o5b2o$b2o103b2o8bobo80b3o4b2o 208bo103bobo$116b2o297bo104b2o$203bo6b2o203b3o103bo95b2o$2b2o199b2o4b 2o299bo99bo5bo2bo$b2o115b3o77b2o2bobo6bo297bobo97bobo4bo2bo$3bo114bo 78bobo308bo2bo96bo2bo5b2o$119bo79bo309b2o98b2o$212b2o370b2o$211b2o193b 2o177b2o$213bo191bobo176bo49bo$407bo113b2o110b2o$521bobo109bobo$521bo$ 588b2o$589b2o$588bo$637b2o$636b2o$638bo!
Keep the cheer,
Dave
Re: NewLifeCA Back Issues
On July 2, 2022, dvgrn wrote:NewLifeCA #21, 2 July 2022: p127 century hassler, plus a 1G decimal-counter seed
Symmetric CatForce Oscillators, Continued
No sooner do I write up a summary of new oscillators than an even newer one comes along. This one seems worth an addendum to the previous message: it's a Mersenne prime period (127) and can possibly be turned into a record-breaking p127 gun.
It's pretty amazing how quickly the new symmetrical option in CatForce is turning up interesting oscillators these days.Code: Select all
#N 74P127 #O ljkiernan1, 2 July 2022 #C Found with a symmetric CatForce search. This is currently the only known #C prime-period oscillator above p47 that doesn't rely on glider or #C signal loops. #C Based on repeatedly catalyzing a symmetric arrangement of two centuries. #C #C Above: minimal form of oscillator #C Below: predecessor of oscillator chain, showing two possible wick connections #C #C https://conwaylife.com/wiki/74P127 #C https://conwaylife.com/forums/viewtopic.php?p=147819#p147819 x = 106, y = 85, rule = B3/S23 47bo$47b3o$50bo$49b2o3$41b2o20bo$41b2o19bobo$62bo2bo$54b2o$52b2obo9bo$ 52bo9b2obo$52b3o7b3o$61bo2bo$63bo$45b2o14bobo6b2o$44bo2bo12b2o8b2o$43b o2bo13b2o$43bob2o14b2o$42bo2bo14bo2bo$43b2o14b2obo$44b2o13bo2bo$34b2o 8b2o12bo2bo$34b2o6bobo14b2o$42bo$41bo2bo$41b3o7b3o$40bob2o9bo$40bo9bob 2o$50b2o$40bo2bo$41bobo19b2o$42bo20b2o3$55b2o$55bo$56b3o$58bo2$47bo44b o$47b3o40b3o$50bo38bo$49b2o38b2o3$13bo27b2o54b2o$13b3o25b2o54b2o$16bo$ 15b2o37b2o28b2o$52b2obo28bob2o$52bo34bo$7b2o43b3o30b3o$7b2o2$20b2o$18b 2obo$18bo$18b3o4$104b2o$104b2o3$51b3o32b3o$53bo32bo$2o48bob2o32b2obo$ 2o48b2o36b2o$97bo$63b2o10b2o19bobo$17b3o43b2o10b2o20bo$19bo$16bob2o$ 16b2o37b2o26b2o$8bo46bo28bo$7bobo19b2o25b3o22b3o$8bo20b2o27bo22bo3$21b 2o$21bo$22b3o$24bo!
Final RCT StageHere's a shameless plug for my somewhat silly but entertaining part of the RCT project. I finished a one-glider seed constellation for a decimal counter today.dvgrn wrote: ↑July 2nd, 2022, 8:21 amWe're now gradually closing in on a complete working demo of how to build Alan Hensel's decimal counter from 1994, using only 16 gliders.
This could be what we've been calling the ATBC, the Actual Thing Being Constructed by a reverse caber tosser pattern. It will be what's left over at the end of an RCT cleanup process; the single trigger glider will be produced by the final "Corderabsorber" cleanup circuit. So after the RCT spends untold aeons building a seed like this, and then cleaning up its three stages of construction arms, the seed and its trigger glider will the only things left in the Life universe.
It seems likely that slsparse can find a slow salvo recipe for the constellation, or one very similar to it, but it hasn't made it all the way through the compilation process yet. Might have to separate a few of the boat-longboat chains a little more, or something along those lines.
Keep the cheer,
Dave
Re: NewLifeCA Back Issues
On July 3, 2022, dvgrn wrote:NewLifeCA #22, 3 July 2022: 4,764,364-tick methuselah inside a 16x16 bounding box
The newest excitement from yesterday and today came from an intermittent contributor to the forums, yaochen2, posting a small maybe-methuselah based on a pair of switch engines, that takes 71,093 ticks to stabilize. It's the same pair of switch engines that Paul Callahan used in the 1.7-million-tick pattern mentioned in a previous NewLifeCA message, but this new pattern fits in 16x15 instead of 16x30:
This got some new searches running, and fairly quickly 16x16 starting points were found that lasted 303,421 and 305,230 ticks before successfully shooting down the switch engine.Code: Select all
#N 71093M #O yaochen2, 2 July 2022 x = 15, y = 16, rule = B3/S23 7bobo$6bo$7bo2bo$9b3o7$bo$3o2$3o9b2o$b2ob2o7b2o$3bo9bo!
A little while later a really big record-breaker showed up that was smaller than Paul's 1.7-million-tick pattern, and also lasted several times longer (4,764,364 ticks):
Ordinarily configurations that produce switch engines are counted as linear-growth patterns rather than methuselahs, because the pattern usually "goes boring" fairly quickly and the switch engine just continues off to infinity, laying blocks or shooting forward gliders as the case may be.Code: Select all
#N 4764364M #O dani, 3 July 2022 x = 16, y = 16, rule = B3/S23 5b4o$9bo$9bo$10b2o5$11bo$o9b2o$o10bo2bo$o10b4o$b2o5bo4b3o$b3o5bob2o2bo $b2o7bobo2bo$9bobobo!
This particular pair of switch engines produces backward-firing gliders, which can produce standard "bihivite" crystals (Paul Chapman's term) and the usual range of chaotic explosions in the source ash cloud. Those interactions can take a long time to settle.
In these cases the usual fate of the pattern is either drill-through (the glider stream knocks out everything opposing it and heads blithely and boringly out into empty space) or the creation of a natural eater or boat-bit catcher that brings the ash production to a sudden end.
Here there's an empty "Hallway of Doom" in the ash from the switch-engine pair, which gliders can easily travel up to crash into and stop the switch engines. Unless drill-through or some kind of glider-catching reaction shows up, it's usually just a matter of time before a glider finds its way into the Hallway of Doom, and turns a previously linear-growth pattern into ... well, if it's not a methuselah, then what is it?
In 4764364M, the time before stabilization is extended by a full one and a half million ticks after the southeast ash blob gets drilled through, by a somewhat improbable series of back-and-forth glider interactions between the southeast ash and the northwest ash. Some of the details are given here.
The search for these "switch-engine methuselahs" was far from exhaustive, of course. Seems like there could easily be a 16x16 pattern that lasts ten million ticks or more.
Keep the cheer,
Dave
Re: NewLifeCA Back Issues
On July 9, 2022, dvgrn wrote:NewLifeCA #23, 9 July 2022: spaceships, greyships, and yet more oscillators, including a non-trivial p34
If I don't keep up with the news this week, my next message will either have to be way too long or will leave out a lot of good stuff. Here goes:
Spaceships and Greyships
These ships are a bit too big to quote in one of these emails, so I'll just give links here:
Oscillators Including A Non-Trivial P34
- c/2 width-12 chicken wire greyship partial with back slope of 0 by Hartmut Holzwart, completed by Keith Amling 5 July 2022
- new c/5 orthogonal spaceships by forum user "May13", 7 July 2022
- c/2 width-7 chicken wire triangular greyship by Hartmut Holzwart, 7 July 2022, with a variant by Keith Amling
- relatively small new c/6 diagonal spaceship by May13, 9 July 2022, with one part in common with a known pushalong for another spaceship, 77P6H1V1
- new c/3 greyship with a back slope of 6/13 by Keith Amling, 9 July 2022
The surge in new oscillator discoveries is continuing. We've been seeing a gradual increase in the number of people who can successfully use various recently-developed search tools to find new never-before-seen oscillators. Omniperiodicity is now definitely just two unknown periods away, p19 and p41, since non-trivial oscillators have been found for the two periods (p34 and p38) where only trivial ones were known at the beginning of this year. EDIT -- CORRECTION: p38 didn't have a trivial known oscillator at the beginning of 2022, since no p19 is known. Raucci's p38 was found on January 12.
If you want a good oscillator overview, some of the more impressive LifeWiki article pages these days are the hassler collections. Not all of these patterns are new, but a good percentage of them are, as you can tell by the number of entries with David Raucci's name on them. David Raucci / hotdogPi started his campaign of Python-script-based oscillator searches just about a year and a quarter ago.
https://conwaylife.com/wiki/Honey_farm_hassler
https://conwaylife.com/wiki/Lumps_of_muck_hassler
https://conwaylife.com/wiki/Pi-heptomino_hassler
https://conwaylife.com/wiki/Pre-pulsar_hassler
Here are some of the most recent discoveries:
Code: Select all
#N 84P199 #O Mitchell Riley and ljkiernan1, 6 July 2022 #C p199 R-pentomino hassler found using symmetric CatForce. #C As the starting phase here shows, this can equally well be called #C a lumps-of-muck hassler. Centuries and pi-heptominos also make an #C appearance in the 199-tick cycle, but not as cleanly as the LOMs. #C https://conwaylife.com/wiki/84P199 x = 52, y = 45, rule = B3/S23 16b2o16b2o$16b2o7b2o7b2o$25b2o4$15b3o16b3o$2o13bobo16bobo13b2o$2o13bo 2bo14bo2bo13b2o$16bobo14bobo$16b3o14b3o9$8b2o32b2o$8b2o32b2o4$8b2o32b 2o$8b2o32b2o9$16b3o14b3o$16bobo14bobo$2o13bo2bo14bo2bo13b2o$2o13bobo16b obo13b2o$15b3o16b3o4$25b2o$16b2o7b2o7b2o$16b2o16b2o!
Code: Select all
#N 52P146 #O Mitchell Riley and ljkiernan1, 6 July 2022 #C https://conwaylife.com/wiki/P146_pi-heptomino_hassler x = 30, y = 20, rule = B3/S23 29bo$27b3o$2o24bo$bo24b2o$bobo$2b2o7bobo$11bobo$11b3o4$4b2o$5bo$2b3o$ 2bo2$8b2o3bo5bo3bo$8b2o2bobo3b2o3b2o$13b2o3b2o3b2o$18bo5bo!
EDIT -- CORRECTION: in the pattern below, adjusted the RLE to match the described phase.Code: Select all
#N 74P34 #O Mitchell Riley, 6 July 2022 #C p34 pi-heptomino hassler, the first non-trivial p34 oscillator. #C The pattern shown here is a two-tick predecessor of the oscillator. #C https://conwaylife.com/wiki/74P34 x = 27, y = 31, rule = B3/S23 15bo$13b3o$3b2o7bo$4bo7b2o$4bobo$5b2o2$2o$bo$bobo$2b2o$25b2o$9b3o13bo$ 9bobo11bobo$9bobo11b2o2$2b2o11bobo$bobo11bobo$bo13b3o$2o$23b2o$23bobo$ 25bo$25b2o2$20b2o$20bobo$13b2o7bo$14bo7b2o$11b3o$11bo!
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#N P74 pi-heptomino hassler #O Mitchell Riley and Tanner Jacobi, 7 July 2022 #C The oscillator is shown here in its most misleading phase #C -- one of the apparent catalysts is really not a catalyst at all. #C https://discord.com/channels/357922255553953794/370571014654001154/994788190143651841 x = 52, y = 52, rule = B3/S23 19bob2o$19b2obo$17b2o18b2o$16bo3b2o9bo5bo2bobo$17b3obo9b3o5b2ob3o$34bo 10bo$5bo5b2o6b2o12b2o4b2ob3o$4bobo5bo6b2o18b2obo$4bobo5bobo8b2o$3b2ob 2o5b2o8bobo$23bo$3b2ob2o29b2o6bo$4bob2o29bo5b3o$2bo8bo23bobo4bo$2b2o7b 3o21b2o5b2o$14bo4bo$13b2o3bobo27bo$5b2o11bo2bo25bobo$4bobo11bobo12b3o 11bobo$4bo14bo12bo3bo7b2obo2b2o$3b2o28bobo8b2o2bobo$34bo12b2o2bo$50b2o $41b3o$43bo$42bo$9bo$8bo$8b3o$2o$o2b2o12bo$bobo2b2o8bobo28b2o$2o2bob2o 7bo3bo12bo14bo$2bobo11b3o12bobo11bobo$2bobo25bo2bo11b2o$3bo27bobo3b2o$ 32bo4bo$8b2o5b2o21b3o7b2o$9bo4bobo23bo8bo$6b3o5bo29b2obo$6bo6b2o29b2ob 2o$28bo$26bobo8b2o5b2ob2o$27b2o8bobo5bobo$9bob2o18b2o6bo5bobo$7b3ob2o 4b2o12b2o6b2o5bo$6bo10bo$7b3ob2o5b3o9bob3o$9bobo2bo5bo9b2o3bo$13b2o18b 2o$29bob2o$29b2obo!
For anyone that wants to try their hand at completing oscillators that are currently just promising script search results in a "partial" state, there are plenty of not-yet-completed partials posted on the Oscillator Discussion Thread, along with more recently discovered oscillators that I haven't mentioned, like "Raucci's 18th p16" (!).Code: Select all
#N 164P112 #O James Pascua, 9 July 2022 #C Pi-heptomino hassler based on a partial found by David Raucci x = 43, y = 73, rule = B3/S23 27bo$26bobo$25bo3bo$24bo3bo$23bo3bo$22bo3bo$23bobo$24bo5b2o3bo$30b2ob 2o$12b2o20bobo$13bo21bo$13bobo19b3o2b2o$14b2o24b2o12$39b2o$39b2o$10bo$ 9b2o12b3o13bo$9b2o11bo3bo11bobo$9bo28bo2bo$23bo3bo11bo2bo$23bo2b2o4b2o $10bo13b2o6b2o5bo2bo$10b3o26b2o$13bo$12b2o2$29b2o$29bo$2b2o26b3o$o2bo 5b2o6b2o13bo$9b2o4b2o2bo$o2bo11bo3bo$bo2bo28bo$2bobo11bo3bo11b2o$3bo 13b3o12b2o$32bo$2b2o$2b2o12$b2o24b2o$b2o2b3o19bobo$7bo21bo$6bobo20b2o$ 8b2ob2o$7bo3b2o5bo$17bobo$16bo3bo$15bo3bo$14bo3bo$13bo3bo$14bobo$15bo!