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Spaceship Discussion Thread

For discussion of specific patterns or specific families of patterns, both newly-discovered and well-known.

Re: Spaceship Discussion Thread

Postby Sokwe » September 1st, 2017, 3:24 am

I noticed that one of Tim Coe's new p8 c/4 orthogonal ships has an isolated p8 spark:
x = 31, y = 15, rule = B3/S23
10b2o6bo10bo$5b3o2b3o15b2o$7bo2b2obobo11b2obo$5b2o5b3o8b2obobobo$b2o2b
o2b3obo3b5o5b2o2bo$2ob2o5bo4b2o5bo4b2obo$bo3bo9bo6bo2bo2b2o$2o3bo17bo
2bob3o$bo3bo9bo6bo2bo2b2o$2ob2o5bo4b2o5bo4b2obo$b2o2bo2b3obo3b5o5b2o2b
o$5b2o5b3o8b2obobobo$7bo2b2obobo11b2obo$5b3o2b3o15b2o$10b2o6bo10bo!

I had thought that this spark was period-4. Using a known trick, I isolated the spark further. This allowed a small interaction with the block deletion in the p20 and p28 ships, resulting in nontrivial p40 and p56 ships:
x = 171, y = 201, rule = B3/S23
108bo10bo20bo10bo$108bo10bo20bo10bo$107bobo8bobo18bobo8bobo2$110bo6bo
24bo6bo$106b4obo4bob4o16b4obo4bob4o$108b2obo4bob2o20b2obo4bob2o$106bo
3bo6bo3bo16bo3bo6bo3bo$105bo16bo14bo16bo$104bo18bo12bo18bo$105bobo12bo
bo14bobo12bobo$108b2o8b2o20b2o8b2o$107b4o6b4o18b4o6b4o$110bo6bo24bo6bo
$106bo14bo16bo14bo$106b2o3b2o2b2o3b2o16b2o3b2o2b2o3b2o$106b2o3b2o2b2o
3b2o16b2o3b2o2b2o3b2o2$111bo4bo26bo4bo$110b3o2b3o24b3o2b3o$108b2ob2o2b
2ob2o20b2ob2o2b2ob2o2$111bob2obo26bob2obo$107b14o18b14o$111bob2obo26bo
b2obo2$106b4o8b4o16b4o8b4o$106bob2o8b2obo16bob2o8b2obo$106b4o8b4o16b4o
8b4o$107b2o10b2o18b2o10b2o$109b2o6b2o22b2o6b2o$105bo4b2o4b2o4bo14bo4b
2o4b2o4bo$105bo16bo14bo16bo$104bobobo10bobobo12bobobo10bobobo$104bob2o
bo8bob2obo12bob2obo8bob2obo$110bo6bo24bo6bo$109bo8bo22bo8bo$112bo2bo
28bo2bo$109bo2b4o2bo22bo2b4o2bo$110bo2b2o2bo24bo2b2o2bo$111b2o2b2o26b
2o2b2o$112b4o28b4o$111b2o2b2o26b2o2b2o$110bo6bo24bo6bo$110bo2b2o2bo24b
o2b2o2bo$109b2o6b2o22b2o6b2o$109b3ob2ob3o22b3ob2ob3o$111b2o2b2o26b2o2b
2o2$108b2ob2o2b2ob2o20b2ob2o2b2ob2o$109bobob2obobo22bobob2obobo$106b4o
8b4o16b4o8b4o$105bo5bo4bo5bo14bo5bo4bo5bo$108b2obo4bob2o20b2obo4bob2o$
109b2o6b2o22b2o6b2o$105b3ob10ob3o14b3ob10ob3o$111b2o2b2o26b2o2b2o$106b
3o3bo2bo3b3o16b3o3bo2bo3b3o$106b6o4b6o16b6o4b6o$107b3o8b3o18b3o8b3o$
111b2o2b2o26b2o2b2o$120b4o12b4o$119bo3bo12bo3bo2$119bo2bo14bo2bo$118b
3o18b3o2$117bo24bo$118bo22bo$27bo88b2obo20bob2o$27bo88b2o2bo18bo2b2o$
26bobo86bo2b2o20b2o2bo$110b3o6bo20bo6b3o$25bo68bo16bo36bo16bo$24bob4o
64bo25b2o16b2o25bo$24bobob2o63bobo16bo6bo20bo6bo16bobo$25bob2o2bo77b4o
5b2o2bo14bo2b2o5b4o$27bo3bo64bo11b3o8b2obo3bo2b2o2bo3bob2o8b3o11bo$27b
2o63b4obo9bo2bo10b2o2b2ob4ob2o2b2o10bo2bo9bob4o$26bobob3o59b2obobo8b2o
bo13bo12bo13bob2o8bobob2o$23b2ob2o3b2o57bo2b2obo8bo8bo11bobo2bobo11bo
8bo8bob2o2bo$24b3o63bo3bo9bo5bo2bobo9b4o2b4o9bobo2bo5bo9bo3bo$26bo66b
2o13bob3o3bo8b10o8bo3b3obo13b2o$24bo2bo6bo54b3obobo8b3o2bo2bob2o28b2ob
o2bo2b3o8bobob3o$23bobob2o4b3o53b2o3b2ob2o62b2ob2o3b2o$28bo4b2obobo56b
3o18b2o24b2o18b3o$23bo3bo8bob2o55bo22bo22bo22bo$40bobo51bo2bo18b2o2b2o
7b2o7b2o2b2o18bo2bo$26b2o8bo4b2o50b2obobo20bo2bo6b2o6bo2bo20bobob2o$
26bob2o6bo6bo49bo25bo2bo14bo2bo25bo$26b2obo7bo2b2o52bo3bo20b2ob2o12b2o
b2o20bo3bo$26b2o80bo11bob2o12b2obo11bo$26b3o12b2o51b2o10b3o3bo5bo2b3o
12b3o2bo5bo3b3o10b2o$26b3o10bo52b2obo9bo3bo2b4o2b2o2bo14bo2b2o2b4o2bo
3bo9bob2o$28bo9bo2bo50bob2o9bo2bo3bo7bobo14bobo7bo3bo2bo9b2obo$26bob2o
9bobo52b2o12b2o3b2o2b5o7b2o7b5o2b2o3b2o12b2o$19bo8bo8b2o54b3o4bo4bobo
21b2o21bobo4bo4b3o$18b3o7b2o63b3o4b4ob2o3bo38bo3b2ob4o4b3o$18b3o17bo
54b3o4bob3o3bobo5b5o18b5o5bobo3b3obo4b3o$20bo9bo7bo54bo9bo4bobo6bobobo
16bobobo6bobo4bo9bo$17b4o8bo8b3o51b2obo4bo13b2obobobo16bobobob2o13bo4b
ob2o$16bobob2o7bo9b2o52bo19bo2bo3bo18bo3bo2bo19bo$16bo5bo16bo52b2o35b
2o35b2o$21b2o6b2o6bo75bobo13b2o13bobo$20bo2bo5b2o8bo54bo20bo28bo20bo$
17b2obobo12b2o2bo53bo20b3o26b3o20bo$16b3obo3b2o3b2o3bobo56bo16b4o2bo
26bo2b4o16bo$15bo6bo6b2o7b2o70b2o3bo28bo3b2o2$18b3o21bo10bo75b2o11bo
10bo$15b2o24b3o8b3o74b2o10b3o8b3o$15b2o4bo7b2o10b3o8b3o86b3o8b3o$18bob
o8b2o10bo12bo86bo12bo$17b2o22b4o6b4o86b4o6b4o$18bobo19b2obobo4bobob2o
84b2obobo4bobob2o$17bo2bo24bo4bo94bo4bo$17bobobo7b2o13bo6bo77b2o13bo6b
o$16b3o10b2o7b3o14b3o71b2o7b3o14b3o$16b3o19b3o14b3o80b3o14b3o$17b2o21b
2o12b2o84b2o12b2o$17b2o22bobo8bobo86bobo8bobo$19b3o7b2o9b3ob2o4b2ob3o
84b3ob2o4b2ob3o$29b2o11b4o4b4o88b4o4b4o$40b3ob3o2b3ob3o73b2o9b3ob3o2b
3ob3o$20b2o17bo4bo6bo4bo72b2o8bo4bo6bo4bo$20b2o18bo3bo2b2o2bo3bo84bo3b
o2b2o2bo3bo$21b2o6b2o16b2o98b2o$29b2o13bobo2bobo92bobo2bobo$43bo2bo2bo
2bo90bo2bo2bo2bo$43bob6obo90bob6obo$42bo2bob2obo2bo75b2o11bo2bob2obo2b
o$29b2o11bo2b2o2b2o2bo75b2o11bo2b2o2b2o2bo$29b2o10bo12bo86bo12bo$44bo
6bo92bo6bo$41bo2bo6bo2bo86bo2bo6bo2bo$40b4o8b4o84b4o8b4o$29b2o8b2o14b
2o82b2o14b2o$29b2o8b2o14b2o72b2o8b2o14b2o$41bo2b2o4b2o2bo74b2o10bo2b2o
4b2o2bo$42bo10bo88bo10bo$39bo2bo2bo4bo2bo2bo82bo2bo2bo4bo2bo2bo$29b2o
7bob2ob2o6b2ob2obo80bob2ob2o6b2ob2obo$29b2o7bo3b2o8b2o3bo80bo3b2o8b2o
3bo$39b2o3bo6bo3b2o82b2o3bo6bo3b2o$44bo6bo77b2o13bo6bo$43bo8bo76b2o12b
o8bo$29b2o14b2o2b2o94b2o2b2o$29b2o14b2o2b2o94b2o2b2o$44bobo2bobo92bobo
2bobo2$45b2o2b2o94b2o2b2o$29b2o14b2o2b2o78b2o14b2o2b2o$29b2o13bo2b2o2b
o77b2o13bo2b2o2bo$44bo6bo92bo6bo$44b8o92b8o$45bo4bo94bo4bo$29b2o13b3o
2b3o92b3o2b3o$29b2o12b2o6b2o90b2o6b2o$43bobo4bobo76b2o12bobo4bobo$7bo
37bo4bo56bo21b2o14bo4bo$6bobo12b2o17b3o3b4o3b3o50bobo12b2o17b3o3b4o3b
3o$5bo4bo10bo2b2o3b2o9bo3bo6bo3bo49bo4bo10bo2b2o14bo3bo6bo3bo$3b3o4bo
3b2o9bo3b2o9bobo10bobo47b3o4bo3b2o9bo14bobo10bobo$3b2o2b2obo2bo3bobo3b
2obo13bo3bob4obo3bo47b2o2b2obo2bo3bobo3b2obo13bo3bob4obo3bo$3b2o4bo3bo
3b3o19b2ob2o3b2o3b2ob2o46b2o4bo3bo3b3o19b2ob2o3b2o3b2ob2o$8bo5b2o5bo4b
o12b5o3b2o3b5o51bo5b2o5bo4bo2b2o8b5o3b2o3b5o$9bo4bob5o4bo3b2o5bo7b2o4b
2o57bo4bob5o4bo3b2o5bo7b2o4b2o$18b2o5bo3b2o5bo8b2o2b2o67b2o5bo10bo8b2o
2b2o$35bobo7bo4bo84bobo7bo4bo$21b2o16bobo79b2o16bobo$bo18bobo17bo60bo
18bobo17bo$3o9bo6b3o7b2o5b3ob2o58b3o9bo6b3o14b3ob2o$3o5b4o2bo5b2o7b2o
6b3o2bo57b3o5b4o2bo5b2o7b2o6b3o2bo$2bo4bo3bo3bo4b2o17bo2bo59bo4bo3bo3b
o4b2o7b2o8bo2bo$2bob2o4bobo2bo6b3o77bob2o4bobo2bo6b3o$bo3bo7bo25b3o59b
o3bo7bo25b3o$5bobob2o2b2ob2o11b2o8bo65bobob2o2b2ob2o21bo$13b5o5b2o4b2o
82b5o5b2o$16b2o5b2o11b2o78b2o5b2o11b2o$17b2o3b2o13bob3o75b2o3b2o5b2o6b
ob3o$36bobo90b2o5bobo$17b2o3b2o5b2o4b3o79b2o3b2o11b3o$29b2o4bobo97bobo
$18b2ob2o11bo3b3o77b2ob2o11bo3b3o$16b2obobob2o14b2o75b2obobob2o14b2o$
15bo3bobo3bo8b3o78bo3bobo3bo8b3o$14bo2b2o3b2o2bo2bobo2bo2bo76bo2b2o3b
2o2bo2bobo2bo2bo$17bo5bo5bobo2bo82bo5bo5bobo2bo$13bo3bo5bo3bo2bo3bo78b
o3bo5bo3bo2bo3bo$17bo5bo10bo3bo78bo5bo10bo3bo$17bo5bo11bo2bo78bo5bo11b
o2bo$35bo99bo$18b2ob2o14b2o79b2ob2o14b2o$16bo3bo3bo91bo3bo3bo$16bo7bo
12b2o77bo7bo12b2o$19bobo16bo80bobo16bo$16b2o2bo2b2o91b2o2bo2b2o$15bob
2o3b2obo12b2o75bob2o3b2obo12b2o$14b3ob5ob3o87b3ob5ob3o$13b2o4b3o4b2o
85b2o4b3o4b2o$15b4obob4o89b4obob4o!


The reason for all of these c/4 orthogonal results is that I have been working on my update to jslife, and have added a c/4 orthogonal extended collection. Looking back through old technology gave me some new ideas. I am now done updating all of the collections of moving objects in jslife except c/3 orthogonal.

Also, thanks to Dave Greene's Life Lexicon update, I noticed this c/4 orthogonal ship (by Nicolay Beluchenko) that should have been in the small ships collection:
x = 25, y = 23, rule = B3/S23
22b3o2$22bobo2$20b2o$19bobo$17bob2o$16b2o3bo$11b3o$14b2o2bobo$12bo6bo$
11bo$9bobo$8bob2o$8b2o$9bo$bo5bobo$bo7bo$obo4bob2o$10bo$5bob3o$b5obo$
2b2o2bo!

This leads to another small ship based on known components:
x = 28, y = 19, rule = B3/S23
19bo$17bo3bo$17bo3b2o$16b2o5b2o$11b3o4bo6bo$14b2o3bo3b3o$12bo6bo3bob2o
$11bo10bo$9bobo15bo$8bob2o14bo$8b2o16bo$9bo$bo5bobo$bo7bo$obo4bob2o$
10bo$5bob3o$b5obo$2b2o2bo!

I also forgot to previously include this tagalong to the 37-cell ship (it was included only as a tagalong to the 41-cell ship):
x = 26, y = 22, rule = B3/S23
bo$bo8bo$obo5bo3bo$8bo3b2o$5bob2o5b2o$b6o2bo6bo$2b2o6bo3b3o$10bo3bob2o
4b3o$13bo9bo$18bo$17bo5bo$16bo2bo2bobo$22b3o$17b5obobo$24bo$17b3o4b2o$
17bobo$17bob2o2$21bo$20bo$20bo!
-Matthias Merzenich
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Re: Spaceship Discussion Thread

Postby A for awesome » September 1st, 2017, 11:09 pm

Three new c/6 pushalongs based on known components:
x = 98, y = 119, rule = B3/S23
2bobo9bobo26bobo9bobo22bobo9bobo$2o3b2o5b2o3b2o22b2o3b2o5b2o3b2o18b2o
3b2o5b2o3b2o$2o3b2o5b2o3b2o22b2o3b2o5b2o3b2o18b2o3b2o5b2o3b2o$5b2o5b2o
32b2o5b2o28b2o5b2o$4b2o7b2o30b2o7b2o26b2o7b2o$3b2o9b2o28b2o9b2o24b2o9b
2o$3bo11bo28bo11bo24bo11bo$4bo9bo30bo9bo26bo9bo$5b2o5b2o32b2o5b2o28b2o
5b2o2$7bo3bo36bo3bo32bo3bo$4bobo5bobo30bobo5bobo26bobo5bobo$2bobo9bobo
26bobo9bobo22bobo9bobo$2bobo9bobo26bobo9bobo22bobo9bobo$2b2o11b2o26b2o
11b2o22b2o11b2o2$3o4bo3bo4b3o22b3o4bo3bo4b3o18b3o4bo3bo4b3o$b2o4bo3bo
4b2o24b2o4bo3bo4b2o20b2o4bo3bo4b2o$b3obobo3bobob3o24b3obobo3bobob3o20b
3obobo3bobob3o$4b3o5b3o30b3o5b3o26b3o5b3o$3b2o2bo3bo2b2o28b2o2bo3bo2b
2o24b2o2bo3bo2b2o$5b2o5b2o32b2o5b2o28b2o5b2o$6bo5bo34bo5bo30bo5bo2$4b
2ob2ob2ob2o30b2ob2ob2ob2o26b2ob2ob2ob2o2$7bo3bo36bo3bo32bo3bo$5bobo3bo
bo32bobo3bobo28bobo3bobo$3bobo2bobo2bobo28bobo2bobo2bobo24bobo2bobo2bo
bo$7bo3bo36bo3bo32bo3bo$2bo2b3o3b3o2bo26bo2b3o3b3o2bo22bo2b3o3b3o2bo$
2bobo2bo3bo2bobo26bobo2bo3bo2bobo22bobo2bo3bo2bobo$3bobob2ob2obobo28bo
bob2ob2obobo24bobob2ob2obobo$4b2o2bobo2b2o30b2o2bobo2b2o26b2o2bobo2b2o
2$8bobo38bobo34bobo$3b2o3bobo3b2o28b2o3bobo3b2o24b2o3bobo3b2o$ob2o4bob
o4b2obo22bob2o4bobo4b2obo18bob2o4bobo4b2obo$3o4bo3bo4b3o22b3o4bo3bo4b
3o18b3o4bo3bo4b3o$obo13bobo22bobo13bobo18bobo13bobo$b2o3bo5bo3b2o24b2o
3bo5bo3b2o20b2o3bo5bo3b2o$bo4bo5bo4bo24bo4bo5bo4bo20bo4bo5bo4bo$2b2obo
7bob2o26b2obo7bob2o22b2obo7bob2o$5bo7bo32bo7bo28bo7bo$4b2ob2ob2ob2o30b
2ob2ob2ob2o26b2ob2ob2ob2o$6bobobobo34bobobobo30bobobobo$3bo2bobobobo2b
o28bo2bobobobo2bo24bo2bobobobo2bo$4bo3bobo3bo30bo3bobo3bo26bo3bobo3bo$
5bobo3bobo32bobo3bobo28bobo3bobo$2b2o11b2o26b2o11b2o22b2o11b2o$bobob2o
5b2obobo24bobob2o5b2obobo20bobob2o5b2obobo$o4bob2ob2obo4bo22bo4bob2ob
2obo4bo18bo4bob2ob2obo4bo$b2o3b3ob3o3b2o24b2o3b3ob3o3b2o20b2o3b3ob3o3b
2o$2o5b2ob2o5b2o22b2o5b2ob2o5b2o18b2o5b2ob2o5b2o$bo15bo24bo15bo20bo15b
o$6b3ob3o34b3ob3o30b3ob3o$o2b3ob2ob2ob3o2bo22bo2b3ob2ob2ob3o2bo18bo2b
3ob2ob2ob3o2bo$2bob3obobob3obo26bob3obobob3obo22bob3obobob3obo$o5bo5bo
5bo22bo5bo5bo5bo18bo5bo5bo5bo$3o4bo3bo4b3o22b3o4bo3bo4b3o18b3o4bo3bo4b
3o$b2obob2o3b2obob2o24b2obob2o3b2obob2o20b2obob2o3b2obob2o$3bo2bo5bo2b
o28bo2bo5bo2bo24bo2bo5bo2bo$3bo2bo5bo2bo28bo2bo5bo2bo24bo2bo5bo2bo$3b
2o9b2o28b2o9b2o24b2o9b2o$4b2o7b2o30b2o7b2o26b2o7b2o$2bob3o5b3obo26bob
3o5b3obo22bob3o5b3obo$3b2o2bo3bo2b2o28b2o2bo3bo2b2o24b2o2bo3bo2b2o$4b
2o2bobo2b2o30b2o2bobo2b2o26b2o2bobo2b2o$4bo3bobo3bo30bo3bobo3bo26bo3bo
bo3bo$5b3o3b3o32b3o3b3o28b3o3b3o$3bo11bo28bo11bo24bo11bo$3bobobo3bobob
o28bobobo3bobobo24bobobo3bobobo$3bob2o5b2obo28bob2o5b2obo24bob2o5b2obo
3$4b2obo3bob2o30b2obo3bob2o26b2obo3bob2o$4b2obobobob2o30b2obobobob2o
26b2obobobob2o$3bo4bobo4bo28bo4bobo4bo24bo4bobo4bo$3bobo3bo3bobo28bobo
3bo3bobo24bobo3bo3bobo$8bobo38bobo34bobo$4b2o7b2o30b2o7b2o26b2o7b2o2$
8b3o38b3o34b2o2bo$88bo$10b2o38b2o$8bo4bo34bo4bo32bo6bo$7bo6bo32bo6bo
30bobob2obobo$6bo8bo30bo8bo29b2o2b2o2b2o$6b2ob4ob2o30b2ob4ob2o33b2o2$
87b2o2b2o$8b2o2b2o34b2o2b2o33b2o2b2o$8b2o2b2o34b2o2b2o34b4o$88bo2bo$
10b2o38b2o35bo4bo$9b4o36b4o34bo4bo$8b2o2b2o34b2o2b2o33bob2obo$8bo4bo
34bo4bo34bo2bo$10b2o38b2o36bo2bo$8bo4bo34bo4bo$8bo4bo34bo4bo28bo14bo$
3bo14bo24bo14bo23b2o4bo2bo4b2o$2bobo4bo2bo4bobo22bobo4bo2bo4bobo22bo5b
4o5bo$5bo3b4o3bo28bo3b4o3bo26b2o4b2o4b2o$2bo16bo22bo16bo24bo10bo$4b2o
10b2o26b2o10b2o24bobo10bobo$3b3o10b3o24b3o10b3o24b5o4b5o$8bo4bo34bo4bo
31bo2b4o2bo$6b2obo2bob2o30b2obo2bob2o28bo4b2o4bo$6b2o2b2o2b2o30b2o2b2o
2b2o32bo2bo$6b2o6b2o30b2o6b2o33b2o$7b2ob2ob2o32b2ob2ob2o31b2ob2ob2o$7b
2ob2ob2o32b2ob2ob2o$85bo8bo$84b3o6b3o$5b3o6b3o28b3o6b3o27bo2bo4bo2bo$
4bo3bo4bo3bo26bo3bo4bo3bo25b2o10b2o$7bo6bo32bo6bo$4b2o10b2o26b2o10b2o!
x₁=ηx
V ⃰_η=c²√(Λη)
K=(Λu²)/2
Pₐ=1−1/(∫^∞_t₀(p(t)ˡ⁽ᵗ⁾)dt)

$$x_1=\eta x$$
$$V^*_\eta=c^2\sqrt{\Lambda\eta}$$
$$K=\frac{\Lambda u^2}2$$
$$P_a=1-\frac1{\int^\infty_{t_0}p(t)^{l(t)}dt}$$

http://conwaylife.com/wiki/A_for_all

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Re: Spaceship Discussion Thread

Postby Sokwe » September 3rd, 2017, 8:58 am

I've finally completed my update of the jslife moving objects collection:
jslife-moving-objects-update-3sep2017.zip
(1.11 MiB) Downloaded 17 times

This is a fairly comprehensive collection of elementary-based moving technology. Caterpillars, Caterloopillars, half-baked ships, and Geminoids are not included in this collection.

Please let me know If you find any errors, omissions, or inconsistencies.

I will also include a link to this post at the beginning of the topic.
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Re: Spaceship Discussion Thread

Postby Apple Bottom » September 16th, 2017, 5:48 am

Sokwe wrote:Please let me know If you find any errors, omissions, or inconsistencies.


Thanks a lot for compiling this collection, it's great to have.

I don't know if this counts as an omission in the strict sense, but one thing I'd love to see is information on who first found which ship, when, and so on, in the same manner as in Dean Hickerson's oscillator stamp collection.

I was just looking for Eppstein's glider glider 16485 (that's 70P2H1V0.1 on Pentadecathlon); found it right away, too, in velocity-c2/c2-extended/c2-0002.rle (again, thanks to everyone!), but as there's no meta-information about any of the ships I'm still in the dark about who first discovered it.
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Re: Spaceship Discussion Thread

Postby Sokwe » September 17th, 2017, 1:04 am

Apple Bottom wrote:I don't know if this counts as an omission in the strict sense, but one thing I'd love to see is information on who first found which ship, when, and so on, in the same manner as in Dean Hickerson's oscillator stamp collection.

I was just looking for Eppstein's glider glider 16485 (that's 70P2H1V0.1 on Pentadecathlon); found it right away, too, in velocity-c2/c2-extended/c2-0002.rle (again, thanks to everyone!), but as there's no meta-information about any of the ships I'm still in the dark about who first discovered it.

Many (perhaps most) patterns in the collection do have that information. That happens to be one of the exceptions. The main reason the information isn't included is that it's just too much work to track down. I spent nearly as much time finding credits for old patterns as I did adding new patterns.

To answer your specific curiosity, 70P2H1V0.1 was found by Hartmut Holzwart sometime in the two weeks preceding 3 July 1992. It was found with the restriction that all on cells have at most 6 on neighbors and all off cells have at most 5 on neighbors. This allows it to work in many different rules, which is probably why David Eppstein included it in his database.

I found the information for this spaceship by first looking at David Bell's article, "Spaceships in Conway's Life (Part 2)" (available from his website). It mentions that Hartmut started searching for p2 ships in June of 1992, and that this specific ship had been found "recently". I then looked at some old email archives to find the specific message in which the ship was posted. Unfortunately, the email archive is not available for public release.
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Re: Spaceship Discussion Thread

Postby Apple Bottom » September 17th, 2017, 6:14 am

Sokwe wrote:I found the information for this spaceship by first looking at David Bell's article, "Spaceships in Conway's Life (Part 2)" (available from his website). It mentions that Hartmut started searching for p2 ships in June of 1992, and that this specific ship had been found "recently". I then looked at some old email archives to find the specific message in which the ship was posted. Unfortunately, the email archive is not available for public release.


Excellent, thanks for the detective work!

I'm curious, too -- how come the archives aren't available? Wasn't this a public mailing list?
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Re: Spaceship Discussion Thread

Postby Sokwe » September 17th, 2017, 1:10 pm

Apple Bottom wrote:how come the archives aren't available? Wasn't this a public mailing list?

The mailing list was not public. As I understand it, the reason the archives aren't made public is that not everyone on the list has given explicit permission. Since the archives date back to April 1992, it might be hard to even get in contact with some of the members. Dave Greene has more details (sorry Dave).

These archives are basically only useful for finding historical information. Even then, most of the interesting historical information has ended up in publicly-available pattern collections and articles.
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Re: Spaceship Discussion Thread

Postby Sokwe » September 20th, 2017, 10:37 pm

A boring p12 c/3 ship:
x = 44, y = 39, rule = B3/S23
27b2obo$24b2ob2ob2o$24bo2bobo2bo$18b2o4b2o5bo$18b2ob2o$17bo3b2o$21b2o$
3bo11bo12bo11bo$b2obo9bob2o3b2o3b2obo9bob2o$4b2o7b2o6b2o6b2o7b2o$5bo7b
o16bo7bo$o2bo4b3o4bo12bo4b3o4bo2bo$4bo9bo14bo9bo$4bo9bo6b2o6bo9bo$6b2o
bob2o18b2obob2o$2bo2bo7bo2bo10bo2bo7bo2bo$2bo2bo7bo2bo10bo2bo7bo2bo$5b
o7bo16bo7bo2$7b5o20b5o$5b2obobob2o16b2obobob2o$5b2obobob2o16b2obobob2o
$4bo3bobo3bo14bo3bobo3bo$7b2ob2o20b2ob2o$7b2ob2o20b2ob2o$4bo2bo3bo2bo
14bo2bo3bo2bo$3b2ob3ob3ob2o12b2ob3ob3ob2o$5bo7bo16bo7bo$5b3o3b3o16b3o
3b3o$5bo2bobo2bo16bo2bobo2bo$5bo7bo16bo7bo$3bobo7bobo12bobo7bobo$2bo2b
o7bo2bo10bo2bo7bo2bo$2bo2bo7bo2bo10bo2bo7bo2bo$bo15bo8bo15bo$bo15bo8bo
15bo$bo15bo8bo15bo$2bobo9bobo10bobo9bobo$2b2o11b2o10b2o11b2o!
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Re: Spaceship Discussion Thread

Postby AforAmpere » September 23rd, 2017, 2:26 pm

3c/10 width 7 was negative for all symmetries with zfind-s, this was the best partial:
x = 15, y = 29, rule = B3/S23
4bo5bo$4bo5bo$2b2obo3bob2o2$2bo9bo$4bo5bo$3o2bo3bo2b3o$5obobob5o$b2o3b
obo3b2o$3b2obobob2o$6bobo$6bobo$2bo3bobo3bo$2b2o2bobo2b2o$3bo2bobo2bo$
4bobobobo$6bobo$ob2o7b2obo$ob2ob2ob2ob2obo$b2o9b2o$5bo3bo2$3o3bobo3b3o
$b2o2b2ob2o2b2o3$b4o5b4o$6o3b6o$o2bobo3bobo2bo!
Things to work on:
- An Isotropic version of All_Speeds
- Find more ships in B2ek3-ajny4ajqr5a/S02ack3ackny4aq5y
- Find a p4 knightship in a Non-totalistic rule (someone please search the rules)
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Re: Spaceship Discussion Thread

Postby AforAmpere » September 24th, 2017, 9:16 pm

3c/10 was also negative for w8 at all symmetries with zfind-s (v, u, a, and g). This is the longest partial (at even bilateral symmetry:
x = 16, y = 37, rule = B3/S23
4bo6bo$3b2o6b2o$2bo10bo$3b3o4b3o$3bob2o2b2obo$3bobo4bobo$2bobo6bobo$2b
o2bo4bo2bo$3b3o4b3o$5bo4bo$3b3o4b3o$2bo2bo4bo2bo$2b4o4b4o$2b2obo4bob2o
$3bo8bo$bobo8bobo$b2o10b2o$2bo10bo$3b2o6b2o$2bo2bob2obo2bo$5bo4bo$6b4o
$3b3o4b3o$2bo10bo$bo2bo6bo2bo$o14bo$3b2o6b2o2$3b3o4b3o$3ob2o4b2ob3o$ob
obo2b2o2bobobo$4b3o2b3o$2b3o6b3o$2bob8obo$o2bo8bo2bo$o2bo8bo2bo$3b3o4b
3o!
Things to work on:
- An Isotropic version of All_Speeds
- Find more ships in B2ek3-ajny4ajqr5a/S02ack3ackny4aq5y
- Find a p4 knightship in a Non-totalistic rule (someone please search the rules)
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