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Line 11: Line 11:
|z                = c/10
|z                = c/10
|h                = 27.8
|h                = 27.8
|symmetry        = -e
|discoverer      = zdr
|discoverer      = zdr
|discoveryear    = 2016
|discoveryear    = 2016
|rulemin          = B3/S23
|rulemin          = B3/S23
|rulemax          = B38/S0238
|rulemax          = B38/S0238
|rulespecial      = [[Conway's Game of Life|Conway Life]]
|isorulemin      = B3-ceky/S23-cik
|isorulemin      = B3-ceky/S23-cik
|isorulemax      = B34ceq5aeijk6aen7c8/S0234ceijyz5ekn6-a7e8
|isorulemax      = B34ceq5aeijk6aen7c8/S0234ceijyz5ekn6-a7e8
Line 27: Line 27:
|pentadecathlonid = 28P10H1V0.1
|pentadecathlonid = 28P10H1V0.1
}}
}}
'''Copperhead''' is a [[c/10 orthogonal]] [[spaceship]] discovered by [[zdr]] on March 5, {{year|2016}} using a modified version of [[gfind]] known as [[zfind]].<ref>{{LinkForumThread|f=2|t=2057|title=is this c/10 spaceship known?|author=zdr|date=March 5, 2016|format=ref}}</ref> It was the first spaceship of this speed to be discovered, and surprised many due to its small size and high period.
'''Copperhead''' is a [[c/10 orthogonal]] [[spaceship]] discovered by [[zdr]] on March 5, {{year|2016}}<ref name="post27988" /> using a new program that later came to be known as [[zfind]], based on David Eppstein's [[gfind]] search program. It was the first spaceship of this speed to be discovered, and surprised many due to its small size and high period.
 
Various names were proposed on the day of the ship's discovery; for example copperhead, blockhauler, decapod, cuttlefish and blockfish. zdr settled on copperhead.<ref name="post28078" />


{{POTY|year=2016|rank=2|behind=the [[caterloopillar]]s}}
{{POTY|year=2016|rank=2|behind=the [[caterloopillar]]s}}


<div style="clear:left">
<div style="clear:left">
==Reactions==
The ship hauls a [[block]] behind it, which makes for interesting reactions involving other ships. [[Dean Hickerson]] built a [[sawtooth]], that uses copperhead's ability to turn a [[heavyweight spaceship]] into a [[loaf]].<ref>{{LinkForumThread|f=2|t=2057|p=28119|title=Re: is this c/10 spaceship known?|author=Dean Hickerson|date=6 March, 2016|format=ref}}</ref> It can also eat gliders and [[middleweight spaceship]]s cleanly from behind, and [[lightweight spaceship]]s from the side of the block. Its front end can cleanly burn through [[blinker]]s, creating a c/10 [[blinker fuse]].


===Fireship===
== Reactions ==
The ship hauls a [[block]] behind it, which makes for interesting reactions involving other ships. [[Dean Hickerson]] built a [[sawtooth]] that uses copperhead's ability to turn a [[heavyweight spaceship]] into a [[loaf]].<ref name="post28119" /> It can also eat gliders and [[middleweight spaceship]]s cleanly from behind, and [[lightweight spaceship]]s from the side of the block. Its front end can cleanly burn through [[blinker]]s, creating [[blinker fuse#c/10 orthogonal|a c/10 blinker fuse]].
{{EmbedViewer
|pname        = blinkerfusecopperheadc10
|viewerconfig = #C [[ THUMBSIZE 2 ZOOM 10 ]]
|position    = center
|caption      = The c/10 copperhead blinker fuse
|style        = width:300px;
}}
 
=== Fireship ===
{{main|Fireship}}
{{main|Fireship}}


[[Simon Ekström]] found [[Fireship|what appeared to be a tagalong]] with a large spark on March 20, 2016.<ref>{{LinkForumThread|p=28956|title=Re: is this c/10 spaceship known?|author=Simon Ekström|date=March 20, 2016|format=ref}}</ref> Unlike most tagalongs, this tagalong actually temporarily interacts with the hauled block, and is thus not a true tagalong but a whole new spaceship, named [[fireship]] due to its unusual spark.<ref>{{LinkForumThread|f=2|t=2057|p=28988|title=Re: is this c/10 spaceship known?|author=towerator|date=20 March 2016|format=ref}}</ref> However, blocks hauled by the tagalongs in tagalong pyramids are unaffected, and are thus true tagalongs.
[[Simon Ekström]] found what appeared to be a [[tagalong]] with a large spark on March 20, 2016.<ref name="post28956" /> Unlike most tagalongs, this tagalong actually temporarily interacts with the hauled block, and is thus not a true tagalong but a whole new spaceship, named [[fireship]] due to its unusual spark. However, blocks hauled by the tagalongs in tagalong pyramids are unaffected, and are thus true tagalongs.<ref name="post28988" />


A [[Fireship tagalong|2c/20 tagalong for the fireship]] is also known, discovered by [[christoph.r]] on October 11, 2018.<ref>{{LinkForumThread|f=2|t=576|p=64623|title=Re: Thread for your unsure discoveries|author=christoph.r|date=October 11, 2018|format=ref}}</ref>
A [[Fireship#Beehive tagalong|2c/20 tagalong for the fireship]] is also known, discovered by [[Christoph Reinthaler]] on October 11, 2018.<ref name="post64623" />


===Cottonmouth===
=== Cottonmouth ===
{{main|Cottonmouth}}
{{main|Cottonmouth}}


A true pushalong known as the [[cottonmouth]] was found by [[AforAmpere]] on March 24, 2018 for both the copperhead and the similar [[fireship]]. Because its front end matches that of the copperhead, it can be infinitely placed on itself.<ref>{{LinkForumThread|f=2|t=2031|p=58357|title=Re: Spaceship Discussion Thread|author=AforAmpere|date=March 24, 2018|format=ref}}</ref>
A true [[pushalong]] known as the [[cottonmouth]] was found by [[AforAmpere]] on March 24, 2018 for both the copperhead and the similar [[fireship]]. Because its front end matches that of the copperhead, it is infinitely [[extensible]] by stacking on itself.<ref name="post58357" />
 
==Synthesis==
The first final step for a synthesis, starting from a large, unsynthesized still life, was proposed by [[praosylen]] on the day of discovery. An alternative synthesis utilising [[fumarole]] as a predecessor, presented by Tanner Jacobi an hour later, was much more efficient. After optimizations by Mark Niemiec and Chris Cain the total synthesis cost made 22 gliders. A copperhead [[gun]] was then completed by Alexey Nigin on March 6, 2016.<ref>{{LinkForumThread|f=2|t=2057|p=28101|title=Re: is this c/10 spaceship known?|author=Alexey Nigin|date=March 6, 2016|format=ref}}</ref> A faster gun was constructed one day later.<ref>{{LinkForumThread|p=28176|title=Re: is this c/10 spaceship known?|author=gmc_nxtman|date=7 March, 2016|format=ref}}</ref>
 
gmc_nxtman reduced the copperhead's synthesis cost to 14 gliders on July 9, 2017;<ref>{{LinkForumThread|f=2|t=2057|p=46308|title=Re: is this c/10 spaceship known?|author=gmc_nxtman|date=July 9, 2017|format=ref}}</ref> 2718281828 posted a 13-glider synthesis on January 9, 2018.<ref name="post54874" />
 
===Soup search results===


The first copperhead to emerge from the [[ash]] of a [[soup]] appeared on April 4, 2016 in a [[Symmetry|D2_+2]] [[haul]] submitted to [[apgsearch|Catagolue]] by Apple Bottom.<ref>{{cite web|url=https://catagolue.hatsya.com/haul/b3s23/D2_+2/13a2db2966f2178690fe73358a3dc2e4|title=Haul|author=Apple Bottom|date=April 4, 2016|accessdate=April 4, 2016|work=Catagolue}}</ref><ref name="post29637" /> Several more copperheads have since been found in this and other related symmetries. It was the first spaceship with a non-standard [[speed]] to appear in a soup search, and the only such spaceship until the [[c/7 orthogonal]] [[loafer]] in 2020.
== Occurrence ==
The first copperhead to emerge from the [[ash]] of a [[soup]] appeared on April 4, 2016 in a [[D2_+2]] [[haul]] submitted to [[Catagolue]] by [[Apple Bottom]].<ref name="post29637" /> Several more copperheads have since been found in this and other related symmetries. It was the first spaceship with a [[Standard spaceship|non-standard speed]] to appear in a soup search, and the only such spaceship until the [[c/7 orthogonal]] [[loafer]] in 2020.


==Naming==
== Synthesis and guns ==
The first final step for a [[glider synthesis]], starting from a large, unsynthesized still life, was proposed by [[praosylen]] on the day of discovery. An alternative synthesis utilising [[fumarole]] as a predecessor, presented by [[Tanner Jacobi]] an hour later, was much more efficient. After optimizations by [[Mark Niemiec]] and [[Chris Cain]] the total synthesis cost made 22 gliders.<ref name="post28085" /> In a different approach, [[gmc_nxtman]] reduced the copperhead's synthesis cost to 14 gliders on July 9, 2017;<ref name="post46308" /> [[2718281828]] posted a 13-glider synthesis on January 9, 2018.<ref name="post54874" />


Various names were proposed on the day of the ship's discovery; for example copperhead, blockhauler, decapod, cuttlefish and blockfish. zdr settled on copperhead.<ref>{{LinkForumThread|f=2|t=2057|p=28078|title=Re: is this c/10 spaceship known?|author=zdr|date=6 March 2016|format=ref}}</ref>
Based on the fumarole route, [[Alexey Nigin]] constructed a period-690 copperhead [[gun]] on March 6, 2016,<ref name="post28101" /> and gmc_nxtman constructed a period-376 gun one day later.<ref name="post28176" /> On August 16, 2018, [[Goldtiger997]] posted a stable glider-to-copperhead [[converter]] based on the latter route, allowing for copperhead guns with period at least 197 to be built.<ref name="post62681" />


==Gallery==
== Gallery ==
{|
{{gallery top}}
|-
{{gallery item|{{EmbedViewer
| [[File:Copperhead eater.png|thumb|A simple copperhead eater found by Simon Ekström.<ref name="post28146" />{{br}}
|pname        = copperheadeaterandtog
[[Media:Copperhead eater.gif|View animated image]]]]
|viewerconfig = #C [[ ZOOM 12 WIDTH 640 HEIGHT 400 AUTOSTART GPS 5 PAUSE 2 LOOP 80 ]]
| [[File:First copperhead.png|thumb|The phase the copperhead was first found in.]]
|position    = center
|}
|caption      = Left: a copperhead [[eater]] found by Simon Ekström.<ref name="post28146" /> Right: a copperhead-to-glider converter found by [[James Pascua]].<ref name="post108519" /> Both involve a [[claw with tail]].
|style        = width:300px;
}}}}
{{gallery item|[[File:First copperhead.png|thumb|center|The phase the copperhead was first found in.]]}}
{{gallery bottom}}


== Other rules ==
== In other rules ==
[[File:Goldenhead.png|frame|right|DryLife's goldenhead.]]
[[File:Goldenhead.png|frame|right|DryLife's goldenhead.]]
In [[DryLife]], an extremely similar spaceship (dubbed the '''goldenhead''') also travels at c/10 orthogonal. It differs from the normal copperhead by 2 cells in one phase. A normal copperhead at this phase will turn into a goldenhead in DryLife, and conversely this phase will return to a copperhead in normal Life.
In {{rl|DryLife}}, an extremely similar spaceship (dubbed the '''goldenhead''') also travels at c/10 orthogonal. It differs from the normal copperhead by 2 cells in one phase. A normal copperhead at this phase will turn into a goldenhead in DryLife, and conversely this phase will return to a copperhead in normal Life.
{{EmbedViewer
|pname        = goldenhead
|viewerconfig = #C [[ ZOOM 16 HEIGHT 350 GPS 5 AUTOSTART TRACKLOOP 10 0 -0.1 ]]
|position    = center
|caption      = Goldenhead
|style        = width:300px;
|apgcode      = xq10_o5995ozes88sezw33/b37s23
}}


==See also==
== See also ==
* [[Loafer]]
* [[Loafer]]


==References==
== References ==
<references>
<references>
<ref name="post54874">{{LinkForumThread
<ref name="post27988">{{LinkForumThread
|accessdate = January 9, 2018
|format = ref
|date       = January 9, 2018
|f      = 2
|author     = 2718281828
|t      = 2057
|title      = Re: Small Spaceship Syntheses
|p      = 27988
|p         = 54874
|title  = is this c/10 spaceship known?
|format     = ref
|author = zdr
|date  = March 5, 2016
}}</ref>
<ref name="post28078">{{LinkForumThread
|format = ref
|f      = 2
|t      = 2057
|p      = 28078
|title  = Re: is this c/10 spaceship known?
|author = zdr
|date   = March 6, 2016
}}</ref>
<ref name="post28085">{{LinkForumThread
|format = ref
|p      = 28085
|title  = Re: is this c/10 spaceship known?
|author = Chris Cain
|date  = March 6, 2016
}}</ref>
<ref name="post28101">{{LinkForumThread
|format = ref
|p      = 28101
|title  = Re: is this c/10 spaceship known?
|author = Alexey Nigin
|date  = March 6, 2016
}}</ref>
<ref name="post28119">{{LinkForumThread
|format = ref
|f      = 2
|t      = 2057
|p      = 28119
|title  = Re: is this c/10 spaceship known?
|author = Dean Hickerson
|date  = March 6, 2016
}}</ref>
<ref name="post28146">{{LinkForumThread
|format = ref
|title = Re: is this c/10 spaceship known?
|p     = 28146
|author = Simon Ekström
|date  = March 6, 2016
}}</ref>
<ref name="post28176">{{LinkForumThread
|format = ref
|p      = 28176
|title  = Re: is this c/10 spaceship known?
|author = gmc_nxtman
|date  = March 7, 2016
}}</ref>
<ref name="post28956">{{LinkForumThread
|format = ref
|p     = 28956
|title  = Re: is this c/10 spaceship known?
|author = Simon Ekström
|date  = March 20, 2016
}}</ref>
<ref name="post28988">{{LinkForumThread
|format = ref
|p      = 28988
|title  = Re: is this c/10 spaceship known?
|author = towerator
|date  = March 20, 2016
}}</ref>
}}</ref>
<ref name="post29637">{{LinkForumThread
<ref name="post29637">{{LinkForumThread
|format = ref
|format = ref
|p      = 29637
|title  = Re: Soup search results
|title  = Re: Soup search results
|p      = 29637
|author = Apple Bottom
|author = Apple Bottom
|date  = April 4, 2016
|date  = April 4, 2016
}}</ref>
}}</ref>
<ref name="post28146">{{LinkForumThread
<ref name="post46308">{{LinkForumThread
|format = ref
|format = ref
|f      = 2
|t      = 2057
|p      = 46308
|title  = Re: is this c/10 spaceship known?
|title  = Re: is this c/10 spaceship known?
|p      = 28146
|author = gmc_nxtman
|author = Simon Ekström
|date  = July 9, 2017
|date  = March 6, 2016
}}</ref>
<ref name="post54874">{{LinkForumThread
|format = ref
|p      = 54874
|title  = Re: Small Spaceship Syntheses
|author = 2718281828
|date  = January 9, 2018
}}</ref>
<ref name="post58357">{{LinkForumThread
|format = ref
|f      = 2
|t      = 2031
|p      = 58357
|title  = Re: Spaceship Discussion Thread
|author = AforAmpere
|date  = March 24, 2018
}}</ref>
<ref name="post62681">{{LinkForumThread
|format = ref
|p      = 62681
|title  = Re: Stable signal converters
|author = Goldtiger997
|date  = August 16, 2018
}}</ref>
<ref name="post64623">{{LinkForumThread
|format = ref
|f      = 2
|t      = 576
|p      = 64623
|title  = Re: Thread for your unsure discoveries
|author = Christoph Reinthaler
|date  = October 11, 2018
}}</ref>
<ref name="post108519">{{LinkForumThread
|format = ref
|p      = 108519
|title  = Re: Stable signal converters
|author = James Pascua
|date  = October 30, 2020
}}</ref>
}}</ref>
</references>
</references>


==External links==
== External links ==
 
* {{LinkCatagolue|xq10_o5995ozes88sezw33}}
* {{LinkCatagolue|xq10_o5995ozes88sezw33}}
* {{LinkPentadecathlonObject|28P10H1V0.1}}
* {{LinkPentadecathlonObject|28P10H1V0.1}}
Line 110: Line 228:
[[Category:Non-monotonic spaceships]]
[[Category:Non-monotonic spaceships]]
[[Category:Patterns discovered by pseudonymous users]]
[[Category:Patterns discovered by pseudonymous users]]
{{Symmetry|orthogonal2}}
{{seminatural}}
{{seminatural}}


__NOTOC__
__NOTOC__

Latest revision as of 23:29, 14 February 2026

Copperhead
b2o2b2o$3b2o$3b2o$obo2bobo$o6bo2$o6bo$b2o2b2o$2b4o2$3b2o$3b2o! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ AUTOSTART ]] #C [[ TRACKLOOP 10 0 -1/10 THUMBSIZE 3 GPS 5 HEIGHT 800 WIDTH 483 ]]
View animated image
View static image
Pattern type Spaceship
Number of cells 28
Bounding box 6 × 12
Direction Orthogonal
Period 10 (mod: 10)
Speed c/10 | c/10
Heat 27.8
Kinetic symmetry -e
Discovered by zdr
Year of discovery 2016

Copperhead is a c/10 orthogonal spaceship discovered by zdr on March 5, 2016[1] using a new program that later came to be known as zfind, based on David Eppstein's gfind search program. It was the first spaceship of this speed to be discovered, and surprised many due to its small size and high period.

Various names were proposed on the day of the ship's discovery; for example copperhead, blockhauler, decapod, cuttlefish and blockfish. zdr settled on copperhead.[2]

Copperhead ranked second place in the Pattern of the Year 2016 competition on the ConwayLife.com forums, behind the caterloopillars.[3]

Reactions

The ship hauls a block behind it, which makes for interesting reactions involving other ships. Dean Hickerson built a sawtooth that uses copperhead's ability to turn a heavyweight spaceship into a loaf.[4] It can also eat gliders and middleweight spaceships cleanly from behind, and lightweight spaceships from the side of the block. Its front end can cleanly burn through blinkers, creating a c/10 blinker fuse.

x = 27, y = 10, rule = B3/S23 5bo$5bo$6bo2bo$4b3ob2obo$2o6b2ob2o$2o6b2ob2o$4b3ob2ob2obo3bo3bo3bo$6bo 2bo4bo3bo3bo3bo$5bo8bo3bo3bo3bo$5bo! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ THUMBSIZE 2 ZOOM 10 ]]
The c/10 copperhead blinker fuse
(click above to open LifeViewer)
RLE: here Plaintext: here

Fireship

Main article: Fireship

Simon Ekström found what appeared to be a tagalong with a large spark on March 20, 2016.[5] Unlike most tagalongs, this tagalong actually temporarily interacts with the hauled block, and is thus not a true tagalong but a whole new spaceship, named fireship due to its unusual spark. However, blocks hauled by the tagalongs in tagalong pyramids are unaffected, and are thus true tagalongs.[6]

A 2c/20 tagalong for the fireship is also known, discovered by Christoph Reinthaler on October 11, 2018.[7]

Cottonmouth

Main article: Cottonmouth

A true pushalong known as the cottonmouth was found by AforAmpere on March 24, 2018 for both the copperhead and the similar fireship. Because its front end matches that of the copperhead, it is infinitely extensible by stacking on itself.[8]

Occurrence

The first copperhead to emerge from the ash of a soup appeared on April 4, 2016 in a D2_+2 haul submitted to Catagolue by Apple Bottom.[9] Several more copperheads have since been found in this and other related symmetries. It was the first spaceship with a non-standard speed to appear in a soup search, and the only such spaceship until the c/7 orthogonal loafer in 2020.

Synthesis and guns

The first final step for a glider synthesis, starting from a large, unsynthesized still life, was proposed by praosylen on the day of discovery. An alternative synthesis utilising fumarole as a predecessor, presented by Tanner Jacobi an hour later, was much more efficient. After optimizations by Mark Niemiec and Chris Cain the total synthesis cost made 22 gliders.[10] In a different approach, gmc_nxtman reduced the copperhead's synthesis cost to 14 gliders on July 9, 2017;[11] 2718281828 posted a 13-glider synthesis on January 9, 2018.[12]

Based on the fumarole route, Alexey Nigin constructed a period-690 copperhead gun on March 6, 2016,[13] and gmc_nxtman constructed a period-376 gun one day later.[14] On August 16, 2018, Goldtiger997 posted a stable glider-to-copperhead converter based on the latter route, allowing for copperhead guns with period at least 197 to be built.[15]

x = 47, y = 27, rule = B3/S23 46bo$44b3o$43bo$43b2o3$17b2o23b2o$17bo19bo4bobo$14b2obo18bobo5bo$13bo 2bo19bobo4bo$13b2o22bo6b3o$27b2o17bo$2o26bo$bo26bobo$bobo5b2o18b2o8b2o $2b2o4bo2bo26bo2bo$8bo2bo26bo2bo$7bo4bo24bo4bo$7bo4bo24bo4bo$8b4o26b4o $7b2o2b2o24b2o2b2o$7bo4bo24bo4bo$7bo4bo24bo4bo3$8b4o26b4o$9b2o28b2o! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ ZOOM 12 WIDTH 640 HEIGHT 400 AUTOSTART GPS 5 PAUSE 2 LOOP 80 ]]
Left: a copperhead eater found by Simon Ekström.[16] Right: a copperhead-to-glider converter found by James Pascua.[17] Both involve a claw with tail.
(click above to open LifeViewer)
RLE: here Plaintext: here
The phase the copperhead was first found in.


In other rules

DryLife's goldenhead.

In DryLife, an extremely similar spaceship (dubbed the goldenhead) also travels at c/10 orthogonal. It differs from the normal copperhead by 2 cells in one phase. A normal copperhead at this phase will turn into a goldenhead in DryLife, and conversely this phase will return to a copperhead in normal Life.

x = 10, y = 13, rule = B37/S23 4b2o$3b4o$4b2o$2b6o$3b4o2$2b2o2b2o$2obo2bob2o$3bo2bo3$4b2o$4b2o! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ ZOOM 16 HEIGHT 350 GPS 5 AUTOSTART TRACKLOOP 10 0 -0.1 ]]
Goldenhead
(click above to open LifeViewer)
RLE: here Plaintext: here
Catagolue: here

See also

References

  1. ↑ zdr (March 5, 2016). is this c/10 spaceship known? (discussion thread) at the ConwayLife.com forums
  2. ↑ zdr (March 6, 2016). Re: is this c/10 spaceship known? (discussion thread) at the ConwayLife.com forums
  3. ↑ Alexey Nigin (June 3, 2017). Pattern of the Year 2016 (Results) (discussion thread) at the ConwayLife.com forums
  4. ↑ Dean Hickerson (March 6, 2016). Re: is this c/10 spaceship known? (discussion thread) at the ConwayLife.com forums
  5. ↑ Simon Ekström (March 20, 2016). Re: is this c/10 spaceship known? (discussion thread) at the ConwayLife.com forums
  6. ↑ towerator (March 20, 2016). Re: is this c/10 spaceship known? (discussion thread) at the ConwayLife.com forums
  7. ↑ Christoph Reinthaler (October 11, 2018). Re: Thread for your unsure discoveries (discussion thread) at the ConwayLife.com forums
  8. ↑ AforAmpere (March 24, 2018). Re: Spaceship Discussion Thread (discussion thread) at the ConwayLife.com forums
  9. ↑ Apple Bottom (April 4, 2016). Re: Soup search results (discussion thread) at the ConwayLife.com forums
  10. ↑ Chris Cain (March 6, 2016). Re: is this c/10 spaceship known? (discussion thread) at the ConwayLife.com forums
  11. ↑ gmc_nxtman (July 9, 2017). Re: is this c/10 spaceship known? (discussion thread) at the ConwayLife.com forums
  12. ↑ 2718281828 (January 9, 2018). Re: Small Spaceship Syntheses (discussion thread) at the ConwayLife.com forums
  13. ↑ Alexey Nigin (March 6, 2016). Re: is this c/10 spaceship known? (discussion thread) at the ConwayLife.com forums
  14. ↑ gmc_nxtman (March 7, 2016). Re: is this c/10 spaceship known? (discussion thread) at the ConwayLife.com forums
  15. ↑ Goldtiger997 (August 16, 2018). Re: Stable signal converters (discussion thread) at the ConwayLife.com forums
  16. ↑ Simon Ekström (March 6, 2016). Re: is this c/10 spaceship known? (discussion thread) at the ConwayLife.com forums
  17. ↑ James Pascua (October 30, 2020). Re: Stable signal converters (discussion thread) at the ConwayLife.com forums


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