2-engine Cordership: Difference between revisions
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|z = 8c/96 | |z = 8c/96 | ||
|h = 110.4 | |h = 110.4 | ||
|symmetry = n | |||
|discoverer = praosylen | |discoverer = praosylen | ||
|discoveryear = 2017 | |discoveryear = 2017 | ||
|rulemin = B3/S23 | |rulemin = B3/S23 | ||
|rulemax = B3/S23 | |rulemax = B3/S23 | ||
|isorulemin = B3/S23 | |isorulemin = B3/S23 | ||
|isorulemax = B3/S23 | |isorulemax = B3/S23 | ||
|synthesis = | |synthesis = 8 | ||
|synthesisRLE = true | |synthesisRLE = true | ||
|plaintext = true | |plaintext = true | ||
|rle = true | |rle = true | ||
|apgcode = xq96_y8573w8aegvzys33zwg8gyvoozsvv0338gy2442cia049uo239e4z037e8x1z08464ogzy011zy3oozyf51guozyd2451032 | |apgcode = xq96_y8573w8aegvzys33zwg8gyvoozsvv0338gy2442cia049uo239e4z037e8x1z08464ogzy011zy3oozyf51guozyd2451032 | ||
|viewerconfig = #C [[ | |viewerconfig = #C [[ HEIGHT 600 WIDTH 600 THUMBSIZE 2 ZOOM 8 Y 2 GPS 32 TRACKLOOP 96 1/12 1/12 ]] | ||
}} | }} | ||
The '''2-engine Cordership''' is a [[c/12 diagonal]] [[spaceship]] that was discovered by praosylen on December 31, {{year|2017}}.<ref name="post54444" /> It is the [[Cordership]] that uses the fewest number of [[switch engine]]s known to be possible (ahead of the [[3-engine Cordership]]) as well as the smallest Cordership in terms of population (ahead of a variant of the [[4-engine Cordership]]) and the smallest engineered spaceship.{{refn|group=note| | The '''2-engine Cordership''' is a [[c/12 diagonal]] [[spaceship]] that was discovered by praosylen on December 31, {{year|2017}}.<ref name="post54444" /> It is the [[Cordership]] that uses the fewest number of [[switch engine]]s known to be possible (ahead of the [[3-engine Cordership]]) as well as the smallest Cordership in terms of population (ahead of a variant of the [[4-engine Cordership]]) and the smallest engineered spaceship.{{refn|group=note|Its status as engineered is debated. In the <tt>{{cata|census/b3s23/sep_stdin|sep_stdin}}</tt> census, which generated and simulated soups comprised of randomly-filled regions behind switch engine pairs at random displacements, with no human intervention, it is the only switch-engine-based spaceship to have occurred, and [[Oscar Cunningham]] found a {{times|16|16}} initial pattern from which it emerges using [[Logic Life Search]]<ref name="post98533" /> (later reduced to {{times|15|15}},<ref name="post167776" /> {{times|14|14}}<ref name="post181943" /> and finally {{times|13|13}}<ref name="post212110" /> by [[b3s23love]]), so its unnatural nature is only due to a lack of searching. | ||
{{EmbedViewer | |||
|rle = x = 13, y = 13, rule = B3/S23 | |||
o2b3ob5o$2obob3obob2o$o2bobo5b2o$o3bo3b2o$2o2b2o2bobo$bo2b4o$3bobo2b2o | |||
bo$ob3o3b2ob2o$obob2o4b3o$5o5bo$ob2o4bobobo$2ob5o3bo$bo4b4o2bo! | |||
|caption = {{times|13|13}} initial pattern that produces a 2-engine Cordership | |||
|position = center | |||
|viewerconfig = #C [[ AUTOSTART THEME 6 ZOOM 16 THUMBNAIL GPS 20 THUMBSIZE 3 HEIGHT 560 T 0 PAUSE 3 ZOOM 6 X -15 Y -10 GPS 32 LOOP 500 ]] | |||
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}} }} | |||
The {{POTY|year=2017|rank=1}} | The {{POTY|year=2017|rank=1}} | ||
==Reactions== | == Reactions == | ||
[[Dave Greene]] noted that the 2-engine Cordership, like its [[3-engine Cordership|3-engine]] counterpart, can be stopped by a single [[glider]] from behind without releasing any [[glider]]s or other [[spaceship]]s,<ref name="post54470" /> and updated [[Martin Grant]]'s [[Model D Heisenburp|Model D]] [[Heisenburp device]] for the 2-engine Cordership.<ref name="post54470" /> | [[Dave Greene]] noted that the 2-engine Cordership, like its [[3-engine Cordership|3-engine]] counterpart, can be stopped by a single [[glider]] from behind without releasing any [[glider]]s or other [[spaceship]]s,<ref name="post54470" /> and updated [[Martin Grant]]'s [[Model D Heisenburp|Model D]] [[Heisenburp device]] for the 2-engine Cordership.<ref name="post54470" /> | ||
| Line 45: | Line 55: | ||
[[gmc_nxtman]] pointed out that the 2-engine Cordership can reflect a glider 180 degrees, while preserving its mod-4 timing, resulting in an updated version of [[glider loop]].<ref name="post54583" /> | [[gmc_nxtman]] pointed out that the 2-engine Cordership can reflect a glider 180 degrees, while preserving its mod-4 timing, resulting in an updated version of [[glider loop]].<ref name="post54583" /> | ||
==Synthesis and seeds== | == Synthesis and seeds == | ||
[[Dave Greene]] found a {{gliders|13}} [[synthesis]] of the 2-engine Cordership on the day of its discovery,<ref name="post54450" /> which [[Luka Okanishi]] improved to {{gliders|9|text=9 gliders}}.<ref name=" | [[Dave Greene]] found a {{gliders|13}} [[synthesis]] of the 2-engine Cordership on the day of its discovery,<ref name="post54450" /> which [[Luka Okanishi]] improved to {{gliders|9|text=9 gliders}} <ref name="post54453" />. Forum user 'vilc' found an {{gliders|8|text=8-glider recipe}} in March {{year|2024}}.<ref name="post180672" /> | ||
Two-glider [[seed]]s using as few as | Two-glider [[seed]]s using as few as 8 still lifes and [[one-glider seed]]s using 14 or 15 still lifes are known.<ref name="post54492" /><ref name="post57674" /><ref name="post188787" /> | ||
{{EmbedViewer | {{EmbedViewer | ||
|pname = 2enginecordershipslowsalvo | |pname = 2enginecordershipslowsalvo | ||
|caption = [[Slow salvo]] construction of a one-glider seed | |caption = [[Slow salvo]] construction of a 15-object one-glider seed | ||
|position = center | |position = center | ||
|viewerconfig = #C [[ THEME 6 THUMBNAIL THUMBSIZE 2 AUTOSTART X -375 Y -375 ZOOM 6 LOOP 5000 ]] | |viewerconfig = #C [[ THEME 6 THUMBNAIL THUMBSIZE 2 AUTOSTART X -375 Y -375 ZOOM 6 GRID OFF CELLBORDERS LOOP 5000 ]] | ||
#C [[ PAUSE 2 LINEAR ZOOM WIDTH 600 HEIGHT 600 ]] | #C [[ PAUSE 2 LINEAR ZOOM WIDTH 600 HEIGHT 600 ]] | ||
#C [[ T 500 ]] | #C [[ T 500 ]] | ||
| Line 61: | Line 71: | ||
#C [[ T 3200 X -380 Y -380 Z 8 LINEAR ZOOM ]] | #C [[ T 3200 X -380 Y -380 Z 8 LINEAR ZOOM ]] | ||
#C [[ T 4000 X -425 Y -425 ]] | #C [[ T 4000 X -425 Y -425 ]] | ||
|style = width: | |style = width:300px; | ||
}} | }} | ||
==Uses== | == Uses == | ||
[[David Bell]] built a [[log(t) growth]] from four 2-engine Corderships,<ref name="post54585" /> and a 4-engine Cordership [[rake]] from two adjacent 2-engine Corderships,<ref name="post54628" /> both on January 3rd, {{year|2018}}. [[2718281828]], [[Dave Greene]] and [[Chris Cain]] posted glider syntheses for this rake on January 7th, allowing for the construction of [[breeder]]s.<ref name="post54798" /><ref name="post54801" /><ref name="post54808" /> | [[David Bell]] built a [[log(t) growth]] from four 2-engine Corderships,<ref name="post54585" /> and a 4-engine Cordership [[rake]] from two adjacent 2-engine Corderships,<ref name="post54628" /> both on January 3rd, {{year|2018}}. [[2718281828]], [[Dave Greene]] and [[Chris Cain]] posted glider syntheses for this rake on January 7th, allowing for the construction of [[breeder]]s.<ref name="post54798" /><ref name="post54801" /><ref name="post54808" /> | ||
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[[Entity Valkyrie]] built an {{times|714|501}} 2-engine Cordership gun on January 6, 2018, using [[Luka Okanishi]]'s 9-glider synthesis;<ref name="post54750" /> [[BlinkerSpawn]] noted that this gun could be compacted to {{times|385|253}} using the [[quadri-Snark]].<ref name="post54753" /> [[Dave Greene]] built an unrelated period-556 2-engine Cordership gun on January 7.<ref name="post54814" /><ref name="post54815" /> Entity Valkyrie built a different gun using a [[boat]] [[keeper]] reaction on January 10.<ref name="post54928" /> On August 29 that year, [[Nathaniel Johnston]] completed a stable glider to 2-engine Cordership [[converter]],<ref name="post63153" /> which converts an input glider to a 2-engine Cordership at [[repeat time]] 556 ticks, thus allowing for arbitrary high-period guns to be built. The following is an improved design by Dave Greene: | [[Entity Valkyrie]] built an {{times|714|501}} 2-engine Cordership gun on January 6, 2018, using [[Luka Okanishi]]'s 9-glider synthesis;<ref name="post54750" /> [[BlinkerSpawn]] noted that this gun could be compacted to {{times|385|253}} using the [[quadri-Snark]].<ref name="post54753" /> [[Dave Greene]] built an unrelated period-556 2-engine Cordership gun on January 7.<ref name="post54814" /><ref name="post54815" /> Entity Valkyrie built a different gun using a [[boat]] [[keeper]] reaction on January 10.<ref name="post54928" /> On August 29 that year, [[Nathaniel Johnston]] completed a stable glider to 2-engine Cordership [[converter]],<ref name="post63153" /> which converts an input glider to a 2-engine Cordership at [[repeat time]] 556 ticks, thus allowing for arbitrary high-period guns to be built. The following is an improved design by Dave Greene: | ||
{{EmbedViewer | {{EmbedViewer | ||
|pname = gliderto2ec | |pname = gliderto2ec | ||
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[https://conwaylife.com/w/index.php?title=RLE:Singlechannel2ecshotgun&action=edit This] is a 2494x2711 single-channel 2-engine Cordership slide gun assembled by Entity Valkyrie. | [https://conwaylife.com/w/index.php?title=RLE:Singlechannel2ecshotgun&action=edit This] is a 2494x2711 single-channel 2-engine Cordership slide gun assembled by Entity Valkyrie. | ||
--> | --> | ||
Toward the end of 2018, Adam P. Goucher added a "0-degree" slow-salvo synthesis of a 2-engine Cordership to [[slmake]], to allow more efficient long [[elbow]] pushes to be automatically compiled in [[self-constructing]] [[spaceship]] [[recipe]]s.<ref name="post63956" /> | Toward the end of 2018, Adam P. Goucher added a "0-degree" slow-salvo synthesis of a 2-engine Cordership to [[slmake]], to allow more efficient long [[elbow]] pushes to be automatically compiled in [[self-constructing]] [[spaceship]] [[recipe]]s.<ref name="post63956" /> | ||
==See also== | == See also == | ||
* {{CategoryLink|Corderships}} | * {{CategoryLink|Corderships}} | ||
==Notes== | == Notes == | ||
<references group="note"/> | <references group="note"/> | ||
==References== | == References == | ||
<references> | <references> | ||
<ref name="post54444">{{LinkForumThread | <ref name="post54444">{{LinkForumThread | ||
| Line 115: | Line 125: | ||
|format = ref | |format = ref | ||
|title = Re: Spaceship Discussion Thread | |title = Re: Spaceship Discussion Thread | ||
|author = | |author = Luka Okanishi | ||
|accessdate = January 4, 2018 | |accessdate = January 4, 2018 | ||
|date = December 31, 2017 | |date = December 31, 2017 | ||
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|p = 63153 | |p = 63153 | ||
|date = August 29, 2018 | |date = August 29, 2018 | ||
}}</ref> | |||
<ref name="post98533">{{LinkForumThread | |||
|author = Macbi | |||
|title = Re: Soup search results | |||
|format = ref | |||
|p = 98533 | |||
|date = August 29, 2018 | |||
}}</ref> | |||
<ref name="post167776">{{LinkForumThread | |||
|author = b3s23love | |||
|title = Re: Soup search results | |||
|format = ref | |||
|p = 167776 | |||
|date = September 25, 2023 | |||
}}</ref> | |||
<ref name="post181943">{{LinkForumThread | |||
|author = b3s23love | |||
|title = Re: Soup search results | |||
|format = ref | |||
|p = 181943 | |||
|date = April 6, 2024 | |||
}}</ref> | |||
<ref name="post212110">{{LinkForumThread | |||
|author = b3s23love | |||
|title = Re: Soup search results | |||
|format = ref | |||
|p = 212110 | |||
|date = May 18, 2025 | |||
}}</ref> | |||
<ref name="post180672">{{LinkForumThread | |||
|p = 180672 | |||
|format = ref | |||
|title = Re: Small Spaceship Syntheses | |||
|author = vilc | |||
|date = March 21, 2024 | |||
}}</ref> | |||
<ref name="post188787">{{LinkForumThread | |||
|p = 188787 | |||
|format = ref | |||
|title = Re: One Glider Seeds | |||
|author = vilc | |||
|date = June 30, 2024 | |||
}}</ref> | }}</ref> | ||
</references> | </references> | ||
==External links== | == External links == | ||
* {{LinkLexicon|lex_1.htm#a-2enginecordership}} | * {{LinkLexicon|lex_1.htm#a-2enginecordership}} | ||
* {{LinkCatagolue|xq96_y8573w8aegvzys33zwg8gyvoozsvv0338gy2442cia049uo239e4z037e8x1z08464ogzy011zy3oozyf51guozyd2451032|format=extended}} | * {{LinkCatagolue|xq96_y8573w8aegvzys33zwg8gyvoozsvv0338gy2442cia049uo239e4z037e8x1z08464ogzy011zy3oozyf51guozyd2451032|format=extended}} | ||
Latest revision as of 07:00, 26 May 2025
| 2-engine Cordership | |||||||||
| View static image | |||||||||
| Pattern type | Spaceship | ||||||||
|---|---|---|---|---|---|---|---|---|---|
| Family | Cordership | ||||||||
| Number of cells | 100 | ||||||||
| Bounding box | 41 × 48 | ||||||||
| Direction | Diagonal | ||||||||
| Period | 96 (mod: 96) | ||||||||
| Speed | c/12 | 8c/96 | ||||||||
| Heat | 110.4 | ||||||||
| Kinetic symmetry | n | ||||||||
| Discovered by | praosylen | ||||||||
| Year of discovery | 2017 | ||||||||
| |||||||||
| |||||||||
| |||||||||
| |||||||||
The 2-engine Cordership is a c/12 diagonal spaceship that was discovered by praosylen on December 31, 2017.[1] It is the Cordership that uses the fewest number of switch engines known to be possible (ahead of the 3-engine Cordership) as well as the smallest Cordership in terms of population (ahead of a variant of the 4-engine Cordership) and the smallest engineered spaceship.[note 1]
The 2-engine Cordership was voted Pattern of the Year for 2017 on the ConwayLife.com forums.[6]
Reactions
Dave Greene noted that the 2-engine Cordership, like its 3-engine counterpart, can be stopped by a single glider from behind without releasing any gliders or other spaceships,[7] and updated Martin Grant's Model D Heisenburp device for the 2-engine Cordership.[7]
Dave Greene, BlinkerSpawn and Matthias Merzenich noted that the 2-engine Cordership can be eaten by a constellation of two eaters and three blocks:[7]
| 2-engine Cordership eater (click above to open LifeViewer) RLE: here Plaintext: here |
gmc_nxtman pointed out that the 2-engine Cordership can reflect a glider 180 degrees, while preserving its mod-4 timing, resulting in an updated version of glider loop.[8]
Synthesis and seeds
Dave Greene found a 13-glider synthesis of the 2-engine Cordership on the day of its discovery,[9] which Luka Okanishi improved to 9 gliders [10]. Forum user 'vilc' found an 8-glider recipe in March 2024.[11]
Two-glider seeds using as few as 8 still lifes and one-glider seeds using 14 or 15 still lifes are known.[12][13][14]
| Slow salvo construction of a 15-object one-glider seed (click above to open LifeViewer) RLE: here Plaintext: here |
Uses
David Bell built a log(t) growth from four 2-engine Corderships,[15] and a 4-engine Cordership rake from two adjacent 2-engine Corderships,[16] both on January 3rd, 2018. 2718281828, Dave Greene and Chris Cain posted glider syntheses for this rake on January 7th, allowing for the construction of breeders.[17][18][19]
Bell further built two different period-96 c/12 forward rakes, one using the 4-engine rake, along with the 2-engine Cordership and an older 3-engine block puffer,[20] the other using a new Cordership boat and block puffer, two 2-engine Corderships, and a sideways rake, both on January 6th, 2018.[20] He also built a different Cordership made from a two-engine boat puffer and a 2-engine Cordership that contains a glider which can escape if the boat is deleted by a sideways or forward glider.[20]
Chris Cain updated the infinite glider hotel to use the 2-engine Cordership on January 3rd, 2018.[21]
Entity Valkyrie built an 714 × 501 2-engine Cordership gun on January 6, 2018, using Luka Okanishi's 9-glider synthesis;[22] BlinkerSpawn noted that this gun could be compacted to 385 × 253 using the quadri-Snark.[23] Dave Greene built an unrelated period-556 2-engine Cordership gun on January 7.[24][25] Entity Valkyrie built a different gun using a boat keeper reaction on January 10.[26] On August 29 that year, Nathaniel Johnston completed a stable glider to 2-engine Cordership converter,[27] which converts an input glider to a 2-engine Cordership at repeat time 556 ticks, thus allowing for arbitrary high-period guns to be built. The following is an improved design by Dave Greene:
| Converts an input glider to a 2-engine Cordership (click above to open LifeViewer) RLE: here Plaintext: here |
Using a variant of the same script used to discover it, praosylen combined the 2-engine Cordership with an additional switch engine to obtain various puffers.[28] Toward the end of 2018, Adam P. Goucher added a "0-degree" slow-salvo synthesis of a 2-engine Cordership to slmake, to allow more efficient long elbow pushes to be automatically compiled in self-constructing spaceship recipes.[29]
See also
- Corderships (category)
Notes
- ↑ Its status as engineered is debated. In the sep_stdin census, which generated and simulated soups comprised of randomly-filled regions behind switch engine pairs at random displacements, with no human intervention, it is the only switch-engine-based spaceship to have occurred, and Oscar Cunningham found a 16 × 16 initial pattern from which it emerges using Logic Life Search[2] (later reduced to 15 × 15,[3] 14 × 14[4] and finally 13 × 13[5] by b3s23love), so its unnatural nature is only due to a lack of searching.
13 × 13 initial pattern that produces a 2-engine Cordership
(click above to open LifeViewer)
References
- ↑ praosylen (December 31, 2017). Re: Spaceship Discussion Thread (discussion thread) at the ConwayLife.com forums
- ↑ Macbi (August 29, 2018). Re: Soup search results (discussion thread) at the ConwayLife.com forums
- ↑ b3s23love (September 25, 2023). Re: Soup search results (discussion thread) at the ConwayLife.com forums
- ↑ b3s23love (April 6, 2024). Re: Soup search results (discussion thread) at the ConwayLife.com forums
- ↑ b3s23love (May 18, 2025). Re: Soup search results (discussion thread) at the ConwayLife.com forums
- ↑ Dave Greene (February 19, 2018). Re: Pattern of the Year 2017 -- votes (discussion thread) at the ConwayLife.com forums
- ↑ 7.0 7.1 7.2 Dave Greene (January 3, 2018). Re: Spaceship Discussion Thread (discussion thread) at the ConwayLife.com forums
- ↑ gmc_nxtman (January 3, 2018). Re: Spaceship Discussion Thread (discussion thread) at the ConwayLife.com forums
- ↑ Dave Greene (December 31, 2017). Re: Spaceship Discussion Thread (discussion thread) at the ConwayLife.com forums
- ↑ Luka Okanishi (December 31, 2017). Re: Spaceship Discussion Thread (discussion thread) at the ConwayLife.com forums
- ↑ vilc (March 21, 2024). Re: Small Spaceship Syntheses (discussion thread) at the ConwayLife.com forums
- ↑ Dave Greene (January 1, 2018). Re: Spaceship Discussion Thread (discussion thread) at the ConwayLife.com forums
- ↑ Dave Greene (March 10, 2018). Re: Thread For Synthesisable Spaceship Guns (discussion thread) at the ConwayLife.com forums
- ↑ vilc (June 30, 2024). Re: One Glider Seeds (discussion thread) at the ConwayLife.com forums
- ↑ David Bell (January 3, 2018). Re: Spaceship Discussion Thread (discussion thread) at the ConwayLife.com forums
- ↑ David Bell (January 3, 2018). Re: Spaceship Discussion Thread (discussion thread) at the ConwayLife.com forums
- ↑ 2718281828 (January 7, 2018). Re: Spaceship Discussion Thread (discussion thread) at the ConwayLife.com forums
- ↑ Dave Greene (January 7, 2018). Re: Spaceship Discussion Thread (discussion thread) at the ConwayLife.com forums
- ↑ Chris Cain (January 7, 2018). Re: Spaceship Discussion Thread (discussion thread) at the ConwayLife.com forums
- ↑ 20.0 20.1 20.2 David Bell (January 6, 2018). Re: Spaceship Discussion Thread (discussion thread) at the ConwayLife.com forums
- ↑ Chris Cain (January 3, 2018). Re: Spaceship Discussion Thread (discussion thread) at the ConwayLife.com forums
- ↑ Entity Valkyrie (January 6, 2018). Guns Discussion Thread (discussion thread) at the ConwayLife.com forums
- ↑ BlinkerSpawn (January 6, 2018). Re: Guns Discussion Thread (discussion thread) at the ConwayLife.com forums
- ↑ Dave Greene (January 7, 2018). Re: Guns Discussion Thread (discussion thread) at the ConwayLife.com forums
- ↑ Dave Greene (January 7, 2018). Re: Spaceship Discussion Thread (discussion thread) at the ConwayLife.com forums
- ↑ Entity Valkyrie (January 10, 2018). Re: Small Spaceship Syntheses (discussion thread) at the ConwayLife.com forums
- ↑ Nathaniel Johnston (August 29, 2018). Re: Stable Signal Converters (discussion thread) at the ConwayLife.com forums
- ↑ praosylen (January 7, 2018). Re: Spaceship Discussion Thread (discussion thread) at the ConwayLife.com forums
- ↑ Adam P. Goucher (September 23, 2018). Re: Slow-salvo recipes (discussion thread) at the ConwayLife.com forums
External links
- 2-engine Cordership at the Life Lexicon
- 2-engine Cordership at Adam P. Goucher's Catagolue (extended)
Categories:
- Patterns
- Spaceships with between 100 and 109 cells
- Periodic objects with minimum population between 100 and 109
- Patterns with between 100 and 109 cells
- Patterns found by praosylen
- Patterns found in 2017
- Patterns that can be constructed with 8 gliders
- Outer-totalistically endemic patterns
- Isotropically endemic patterns
- Spaceships
- Spaceships with period 96
- Diagonal spaceships
- Spaceships with speed c/12
- Spaceships with unsimplified speed 8c/96
- Spaceships with heat between 110 and 119
- Cordership variants
- Spaceships with mod 96
- Spaceships with n symmetry
- Pattern of the Year top contenders
- Pattern of the Year winners
- Engineered spaceships
- Non-monotonic spaceships
- Patterns involving switch engines