2-engine Cordership

2-engine Cordership
x = 41, y = 49, rule = B3/S23 19b2o$19b4o$19bob2o2$20bo$19b2o$19b3o$21bo$33b2o$33b2o7$36bo$35b2o$34b o3bo$35b2o2bo$40bo$37bobo$38bo$38bo$38b2o$38b2o3$13bo10bo$12b5o5bob2o 11bo$11bo10bo3bo9bo$12b2o8b3obo9b2o$13b2o9b2o12bo$2o13bo21b3o$2o35b3o 7$8b2o$8b2o11b2o$19b2o2bo$24bo3bo$18bo5bo3bo$19bo2b2o3bobo$20b3o5bo$ 28bo! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ AUTOSTART ]] #C [[ TRACK 1/12 1/12 THUMBSIZE 2 GPS 48 HEIGHT 480 WIDTH 480 ]]
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
Speed (unsimplified)	8c/96
Heat	110.4
Discovered by	Aidan F. Pierce
Year of discovery	2017
Rules Outer-totalistic rules B3/S23 only Important rules Conway Life # of rules 20 = 1 Isotropic rules B3/S23 only
Glider synthesis Fewest gliders 9 Catagolue-generated RLE 2enginecordership_synth.rle Uploaded synthesis RLE 2enginecordership_synth.rle
Pattern files Plaintext 2enginecordership.cells RLE 2enginecordership.rle
Identifiers apgcode xq96_y8573w8aegvzys33zwg8gyvoozsvv0338gy2442cia049uo239e4z037e8x1z08464ogzy011zy3oozyf51guozyd2451032

The 2-engine Cordership is a c/12 diagonal spaceship that was discovered by Aidan F. Pierce on December 31, 2017. 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.

The 2-engine Cordership was voted the Pattern of the Year 2017 on ConwayLife.com.

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, and updated Martin Grant's Model D Heisenburp device for the 2-engine Cordership.

Dave Greene, Blinkerspawn and Matthias Merzenich noted that the 2-engine Cordership can be eaten by a constellation of two eaters and three blocks:

x = 83, y = 86, rule = B3/S23 19b2o$19b4o$19bob2o2$20bo$19b2o$19b3o$21bo$33b2o$33b2o7$36bo$35b2o$34b o3bo$35b2o2bo$40bo$37bobo$38bo$38bo$38b2o$38b2o3$13bo10bo$12b5o5bob2o 11bo$11bo10bo3bo9bo$12b2o8b3obo9b2o$13b2o9b2o12bo$2o13bo21b3o$2o35b3o 7$8b2o$8b2o11b2o$19b2o2bo$24bo3bo$18bo5bo3bo$19bo2b2o3bobo$20b3o5bo47b 2o$28bo47b2o20$79b2o$79bo$80b3o$82bo5$39b2o$39b2o4$66b2o$66bo$67b3o$ 47b2o20bo$47b2o! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ THEME 6 THUMBNAIL THUMBSIZE 2 ZOOM 6 HEIGHT 600 WIDTH 600 ]]

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.

Synthesis and seeds

Dave Greene found a 13-glider synthesis of the 2-engine Cordership on the day of its discovery, which Luka Okanishi improved to 9 gliders.

Two-glider seeds using as few as 9 still lifes and one-glider seeds using 15 still lifes are known.

#N 2-engine Cordership, slow salvo construction of 1-glider seed #O Dave Greene, 2018 #C http://conwaylife.com/forums/viewtopic.php?p=57674#p57674 #C http://conwaylife.com/wiki/2-engine_Cordership x = 761, y = 777, rule = B3/S23 2o$2o4$3o$o$bo9$11b3o$11bo$12bo8$13b2o$12b2o$14bo5$13b3o$13bo$14bo$31b 3o$31bo$32bo39$75b2o$74b2o$76bo2$80b2o$79b2o$81bo11$59b2o29b2o$58b2o 29b2o$60bo30bo11$99b2o$98b2o$100bo$113b2o$112b2o$114bo21$144b2o$119b2o 22b2o$118b2o25bo$120bo$113b2o$112b2o$114bo8$128b2o$127b2o$129bo3$117b 2o$116b2o$118bo24b2o$142b2o$144bo2$133b2o$132b2o$134bo7$155b2o$154b2o$ 156bo10$165b3o$165bo$166bo4$165b2o$164b2o$166bo8b2o$174b2o$176bo13$ 193b2o$192b2o$194bo2$196b3o$196bo$197bo8$209b3o$209bo$210bo4$217b3o$ 217bo$218bo2$207b3o$207bo$208bo23b3o$232bo$213b3o17bo$213bo$214bo$203b 2o$202b2o$204bo29b3o$234bo$224b3o8bo$224bo$225bo$236b2o$214b2o19b2o$ 213b2o22bo$215bo8$240b2o$230b2o7b2o$229b2o10bo$231bo11$228b2o$227b2o$ 229bo14$246b2o$245b2o$247bo36$266b3o$266bo$267bo8$279b3o$279bo$280bo5$ 294b3o$294bo$295bo3$291b2o$290b2o$292bo21$319b3o$319bo$320bo9$313b3o$ 313bo$314bo14b3o$329bo$330bo3$320b3o$320bo$321bo2$338b3o$338bo$339bo5$ 353b3o$353bo$354bo9$378b2o$377b2o$365b3o11bo$365bo$366bo8$380b3o$380bo $381bo5$374b3o$374bo$375bo2$392b3o$369b2o21bo$368b2o23bo$370bo6$384b2o $383b2o$385bo7$376b2o$375b2o$377bo$413b2o$412b2o$414bo$417b3o$417bo$ 418bo2$414b2o$413b2o$415bo3$470b2o$393b2o74b2o$392b2o77bo$394bo5$427b 3o$427bo$428bo3$479b2o$438b2o38b2o$437b2o41bo$439bo2$442b2o$441b2o$ 443bo3$495b2o$490b2o2b2o$489b2o5bo$491bo10$517b2o$516b2o$518bo13$512b 3o$512bo$513bo3$434b3o93b2o$434bo94b2o4b2o$435bo95bo2b2o$536bo4$507b3o $507bo$508bo3$502b2o$501b2o$503bo5$463b2o$462b2o52b3o$464bo51bo$517bo 9$528b3o$528bo$529bo$521b2o$483b3o34b2o$483bo38bo$484bo3$488b2o$487b2o $489bo44b2o$482b2o49b2o10b2o6b3o$481b2o52bo8b2o7bo$483bo62bo7bo8$498b 2o$497b2o$499bo7b2o$506b2o$508bo48b3o$557bo7b3o$558bo6bo$566bo2$572b2o $571b2o$573bo2$519b2o$518b2o66b3o$520bo56b2o7bo$530b2o44b2o9bo$529b2o 47bo$531bo2$579b3o$579bo26b2o$580bo24b2o$607bo5$605b3o$605bo$554b2o50b o$553b2o$555bo6$618b3o$618bo$619bo6$621b3o$621bo$622bo$629b3o$629bo$ 567b2o61bo$566b2o$568bo55b3o$624bo$625bo3$566b2o$565b2o$567bo2$645b3o$ 645bo$646bo3b3o$650bo$651bo12$670b3o$670bo$671bo125$758b2o$758bobo$ 758bo! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ THEME 6 THUMBNAIL THUMBSIZE 2 AUTOSTART X -375 Y -375 ZOOM 6 LOOP 5000 ]] #C [[ PAUSE 2 LINEAR ZOOM WIDTH 600 HEIGHT 600 ]] #C [[ T 500 ]] #C [[ T 1000 X -200 Y -200 Z -1 STEP 5 ]] #C [[ T 3000 X -350 Y -350 Z 4 LINEAR ZOOM ]] #C [[ T 3200 X -380 Y -380 Z 8 LINEAR ZOOM ]] #C [[ T 4000 X -425 Y -425 ]]

Slow salvo construction of a 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, and a 4-engine Cordership rake from two adjacent 2-engine Corderships, 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.

Bell further built two different period 96 c/12 forward rakes, one using the the 4-engine rake, along with the 2-engine Cordership and an older 3-engine block puffer, the other using a new Cordership boat and block puffer, two 2-engine Corderships, and a sideways rake, both on January 6th, 2018. 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.

Chris Cain updated the infinite glider hotel to use the 2-engine Cordership on January 3rd, 2018.

'Entity Valkyrie' built an 714×501 2-engine Cordership gun on January 6, 2018, using Luka Okanishi's 9-glider synthesis; BlinkerSpawn noted that this gun could be compacted to 385×253 using the quadri-Snark. Dave Greene built an unrelated period-556 2-engine Cordership gun on January 7th, 2018. 'Entity Valkyrie' built a different gun using a boat keeper reaction on January 10, 2018.

Aidan F. Pierce combined the 2-engine Cordership with an additional switch engine to obtain various puffers.

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.

External links

• 2-engine Cordership at the Life Lexicon

• 2-engine Cordership at Adam P. Goucher's Catagolue (extended)