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c/7 orthogonal spaceships

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c/7 orthogonal spaceships

Postby HartmutHolzwart » February 11th, 2013, 5:04 pm

Now with several new versions of search programs out and PCs still getting more powerful, it might be time to revisit this topic:

Are there any serious search results out there? Promising intermediate results? Ideas?

Thanks in advance,
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Re: c/7 orthogonal spaceships

Postby velcrorex » February 13th, 2013, 2:25 pm

The best c/7 partial pattern I have is this:
x = 40, y = 17
11bo$10bobbo12bo$5b3obbo14bobo11bo$10bo10boobb3oboo3bo4bo$boo11boboobb
o7b4o3b4o$obbo6bobob8o4boobobobobo$boobboo3bo28bo$5boo4b12obbo8boobo$$
5boo4b12obbo8boobo$boobboo3bo28bo$obbo6bobob8o4boobobobobo$boo11boboo
bbo7b4o3b4o$10bo10boobb3oboo3bo4bo$5b3obbo14bobo11bo$10bobbo12bo$11bo!

There may certainly be longer partial patterns for this width.

Paul Tooke may have some better partial patterns and has likely put some serious search time in on this problem.

My only idea is to take a partial pattern with a small width, like the partial I posted near the front where the blinkers are, and try to extend the pattern in different directions. I have not had any success with this.
It may also be useful to learn more about how the c/7 diagonal ship was discovered.

Edit:
Another partial:
x = 35, y = 27
31bo$31bo$28bobboo$28bo$27b3o$26bo7bo$24bo4bo$18bo4bo3bo$7bo8bobobboo
3boo$boo3bobb4obo3bobboobo$obboboobo5bobo4bobo$boo3bobob3obo3bobbo$17b
4o$$17b4o$boo3bobob3obo3bobbo$obboboobo5bobo4bobo$boo3bobb4obo3bobboob
o$7bo8bobobboo3boo$18bo4bo3bo$24bo4bo$26bo7bo$27b3o$28bo$28bobboo$31bo
$31bo!
-Josh Ball.
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Re: c/7 orthogonal spaceships

Postby Paul Tooke » February 17th, 2013, 11:24 am

velcrorex wrote:
Paul Tooke may have some better partial patterns and has likely put some serious search time in on this problem.


According to my records that is incorrect on both counts. The only searches I did for c/7 orthogonal spaceships were a few narrow width gfind searches back in 2000. That was before I had added the state-saving code, so I have no partial patterns.

I do remember at one time trying searches with the search tree initialized with partial patterns consisting of the beehive-push from the Dragon (It can happen at c/N for N>=6). This is similar to the front end of Hartmut's partial result. Unfortunately, I don't appear to have retained any records of the seaches or any partial patterns.

I believe that Hartmut is right. Technology has moved on and it may be that there are things to be found by someone who is prepared to devote a good chunk of CPU time to the effort.
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Re: c/7 orthogonal spaceships

Postby velcrorex » February 17th, 2013, 12:10 pm

Paul,
Thanks for the input. I knew you had some quality 3c/7 partials from your long searches, so I had assumed similar for c/7.
-Josh Ball.
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Re: c/7 orthogonal spaceships

Postby velcrorex » February 17th, 2013, 5:42 pm

I found a c/7 spaceship!!! And it's small, min pop 20 cells.
x = 9, y = 9
boobboboo$obbobboo$bobo$bbo$8bo$6b3o$5bo$6bo$7boo!
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Re: c/7 orthogonal spaceships

Postby Sokwe » February 17th, 2013, 7:30 pm

That is absolutely amazing! This has to be glider constructable. I'm freakin' out over here!

Edit: I honestly thought you were joking. I looked at the RLE and thought, "Ha Ha, I wonder what that really is." Boy, was I surprised!

Edit 2: I honestly thought you were joshing me. Eh? Eh?
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Re: c/7 orthogonal spaceships

Postby calcyman » February 17th, 2013, 8:00 pm

Glider synthesis:

x = 19, y = 24, rule = B3/S23
3bo13bo$4bo11bo$2b3o11b3o3$7b2o$7bo8bo$8bo6b2o$9bo5bobo$6bo3bobo$5bobo
3b2o$5bo2bo$6b2o$13bo$b2o8b3o$obo7bo$2bo8b3o$13bo3$10bo$10bo4b2o$10bo
4bobo$15bo!


I'll probably leave it to someone else to build an explicit gun.
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Re: c/7 orthogonal spaceships

Postby Tropylium » February 17th, 2013, 8:06 pm

Hoooooooly shit, that's awesome. :shock:

Shows that there are probably other similar surprizes still lurking around to be found…

I find interesting how the two halves interact only marginally, seems like there could be potential for a further grammar of components. E.g. two copies of the lower portion make up a symmetric 16-cell spaceship if birth from 4 diagonal neighbors is allowed…
x = 4, y = 11, rule = rotatingb
2b2o$bo$o$b3o$3bo2$3bo$b3o$o$bo$2b2o!

(I posted some stuff on this Life tweak not long ago)
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Re: c/7 orthogonal spaceships

Postby calcyman » February 17th, 2013, 8:24 pm

Full incremental synthesis:

x = 149, y = 34, rule = B3/S23
o$b2o$2o127bo17bo$130bo15bo$128b3o15b3o$4bobo$4b2o79b2o$5bo79bo$42b2o
42bo$3b2o37bo44bo38bobo6b2o$2b2o39bo44bobo36b2o6bo$4bo39bo44b2o36bo8bo
$45bobo89bo8bo$46b2o90bobo4b2o$91bo38bobo6b2o4bobo$8b2o79b3o39b2o$7b2o
31bo12bobo32bo42bo$9bo28bobo12b2o34b3o49bo$39b2o13bo36bo39b3o5b3o$42b
2o6b2o81bo4bo$43b2o5bobo79bo6b3o$42bo7bo90bo3$138bo$138bo$138bo$145b2o
$94b2o49bobo$94bobo48bo$94bo$84b3o$86bo$85bo!
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Re: c/7 orthogonal spaceships

Postby calcyman » February 17th, 2013, 8:46 pm

And here is the 18-glider synthesis as a single pattern. I predict that someone will make a gun out of this within 18 hours:

x = 87, y = 102, rule = B3/S23
7bo77bo$8bo75bo$6b3o75b3o5$4bobo$5b2o$5bo3$8bobo$9b2o$9bo5$33bo$34b2o$
33b2o3$57bobo$21bo35b2o15bobo$19bobo36bo15b2o$20b2o53bo21$56b2o$55b2o$
57bo4$61b2o$60b2o$62bo12$23b2o46b2o$24b2o45bobo$23bo47bo12bo$83b2o$83b
obo4$9b3o$11bo$10bo$72b2o$72bobo$72bo$22b3o$24bo$23bo$83b2o$83bobo$83b
o12$3o$2bo$bo!
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Re: c/7 orthogonal spaceships

Postby velcrorex » February 18th, 2013, 1:52 am

I should add that I found this with WLS. I found the smaller half a while ago, but couldn't finish a spaceship with it. This thread encouraged me to keep looking. In my searches WLS found the second half and completed the ship with the first half I had found earlier. It's entirely possible that there are other ships which use these parts. I was very surprised how small this ship was, and had to recheck several times that I had been searching with the right settings.
Thanks for coming up with a glider synthesis so quickly. It's not every ship that has a synthesis.
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Re: c/7 orthogonal spaceships

Postby Sokwe » February 18th, 2013, 3:03 am

In the realm of boring synthesis reductions, this ship takes no more than 11 gliders:
x = 26, y = 37, rule = B3/S23
23bobo$23b2o$24bo$10bo$2bo5bobo$obo6b2o$b2o3$6bo$4bobo$5b2o4$18bo$16b
3o$15bo$6bo9b3o$6b2o10bo$5bobo8$12b2o$11bobo$13bo2$23bo$22b2o$5b3o14bo
bo$7bo$6bo!

It is very likely that the bottom part can be synthesized more directly (with 3 or 4 gliders).
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Re: c/7 orthogonal spaceships

Postby Kasuha » February 18th, 2013, 11:55 am

Congratulations to a really awesome c/7 ship, I would never believe that such a small object could avoid being found in myriads random soup/random agar searches performed so far. I had to check the rule twice before I believed that it's really running in the standard GoL rule...
Congratulations!
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Re: c/7 orthogonal spaceships

Postby dvgrn » February 18th, 2013, 11:59 am

velcrorex wrote:Thanks for coming up with a glider synthesis so quickly. It's not every ship that has a synthesis.

You can say that again! Hardly *any* spaceships have syntheses, let alone such straightforward ones. This will fairly quickly require an update the whole (1,0)c/7 line in Jason Summer's table of spaceship velocities. Except maybe the "wickstretcher" cell -- anyone know if there are any likely wick candidates at c/7?

"Versatile puffer" will take a while, too, I suppose. But from the look of the two parts of that c/7 ship, with interaction in only one tick out of the seven, it certainly seems as if new combinations and tagalongs with usable sparks might appear in fairly short order.

Edit: I looked again, and it's not quite that simple a connection; there's some interaction between the halves in two successive ticks. Still seems like a good bet that there are more variants out there!

-- Do you have a name yet for these wonderful new Life forms? I'm thinking of them as "loafers" until you come up with something official.
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Re: c/7 orthogonal spaceships

Postby Sokwe » February 18th, 2013, 5:00 pm

dvgrn wrote:from the look of the two parts of that c/7 ship, with interaction in only one tick out of the seven, it certainly seems as if new combinations and tagalongs with usable sparks might appear in fairly short order... I looked again, and it's not quite that simple a connection; there's some interaction between the halves in two successive ticks. Still seems like a good bet that there are more variants out there!

I have seen the smaller part of this spaceship in my own searches, and it has other simple connections that might lead to new ships:
x = 37, y = 8, rule = B3/S23
2o31b2o$b2o14b3o13b4o2$3b3o11b3o11b3o$4b2o12b2o12b2o$b2obo10b2obo10b2o
bo$bo2bo10bo2bo10bo2bo$2b2o12b2o12b2o!

On this note, I think I have eliminated the possibility of a height 8 c/7 orthogonal spaceship (I'd like independent confirmation before I say anything definite), but starting with one of the parts of this new spaceship may be a quick way to find something taller. Has anyone ruled out the possibility of a width 9 spaceship of this speed?

Still, we might be as well off trying to find new c/6 orthogonal spaceships, as we still don't have any puffers for that speed. A good starting point might be the following subpattern, which occurs in two of the known c/6 orthogonal spaceships:
x = 10, y = 8, rule = B3/S23
2b2ob2o$b4obo$o6bo$bo4bo$6bo2bo$4bo3bo$8bo$8bo!


dvgrn wrote:anyone know if there are any likely wick candidates at c/7?

The only viable candidate I know of is this period-12 wick:
x = 47, y = 7, rule = B3/S23
2bo5bo5bo5bo5bo5bo5bo5bo$2o2bob2o4b2o2bob2o4b2o2bob2o4b2o2bob2o$4o2b2o
b2ob4o2b2ob2ob4o2b2ob2ob4o2b2ob2o2$4o2b2ob2ob4o2b2ob2ob4o2b2ob2ob4o2b
2ob2o$2o2bob2o4b2o2bob2o4b2o2bob2o4b2o2bob2o$2bo5bo5bo5bo5bo5bo5bo5bo!

Unfortunately, we don't seem to be close to even finding a c/5 stretcher for this wick, much less a stationary stabilization for either end.
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Re: c/7 orthogonal spaceships

Postby Sokwe » February 18th, 2013, 8:20 pm

Here's an 8-glider synthesis:
x = 40, y = 37, rule = B3/S23
38bo$37bo$37b3o2$8bobo$obo6b2o$b2o6bo$bo3$4bobo$5b2o$5bo20bo$24bobo$
25b2o2$33bo$33bobo$33b2o6$38bo$37b2o$37bobo8$5b3o$7bo$6bo!

This could still probably be worked down a little.
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Re: c/7 orthogonal spaceships

Postby skomick » February 18th, 2013, 9:03 pm

Awesome find :!: :!:
Here's a p210 c/7 gun using a 12-glider recipe:
x = 299, y = 335, rule = B3/S23
26bo17bo5b2o$26bobo13b3o5b2o$9bo17bobo4b2o5bo$9b2o16bo2bo3b2o5b2o$4b2o
4b2o15bobo21bo$2o2b2o4b3o13bobo21bobo$2o2b2o4b2o7bobo4bo12bo9bo3bo$9b
2o9b2o17bo9b5o$9bo10bo17bobo7b2o3b2o$37b2ob2o7b5o43b2o$36bo5bo7b3o44b
2o$39bo11bo$36b2o3b2o$27bo$28b2o$27b2o10bo$37b2o$11b2o6b2o76b3o$10bo2b
o4bo2bo14bo7b2o50bo3bo$9b6o2b6o16bo4bobo36b3o$10bo2bo4bo2bo15bobo5b3o
36bo10bo5bo$11b2o6b2o13bo2bo8b3o35bo10b2o3b2o$35b2o8b3o35b3o$35bo8bobo
$44b2o37b3o12bo$83b3o11bob2o$97bo$44b2o19b2o16b3o11bo3bo$45bo19bo18bo
13bo2bo$45bobo7bobo5bobo18bo13b5o$36bo9b2o6bo2bo5b2o18b3o12b5o$37b2o
14b2o42b2o3b2o$36b2o13b2o3bo41b5o$53b2o36bobo5b3o$54bo2bo25bo7b2o7bo$
55bobo23b2o9bo$82b2o40b2o$43b2o79b2o$42bobo$44bo$125bo$124bobo$123bo3b
o$100b2o21b5o$100b2o20b2o3b2o$92bo30b5o$90bobo18bo12b3o$88b2o20b3o12bo
$88b2o19b5o$88b2o$47bobo40bobo7b2o$46bo2bo31b3o8bo7bobo23bo$35b3o7b2o
6b2o47bo20b2o$43b2o3bo3bo2bo25bobo18b2o19b3o$12bo2bob2obo2bo21b2o6b2o
25b5o39b2o$11b2o2bo4bo2b2o21bo2bo3b2o24b2o3b2o23b5o10bo$12bo2bob2obo2b
o23bobo3bo25b2o3b2o24b3o10bobo$52bobo36b2o18bo11b2o$41bo10bobo36bobo$
40bobo10bo28bo3b2o6bo7b2o$39bo3bo37bobobo2bo2bo2bo7b2o20b2obob2o$40b3o
38bobo2b2o6bo$26b3o9b2o3b2o5b2o3b2o25bo8bobo23bo6bo5bo$28bo21bobobobo
34b2o22b2o$27bo23b5o60b2o7b2ob2o$52b3o72bo$13b2o38bo57bo$13b2o4bo88b2o
2bo$2b2o6b2o6b5ob2o81bo$2b2o5b3o5bo2b2o4bo80bo2b2o$10b2o5b2o8bo80bobo
16b2o$13b2o4bo7bo8b2o5b2o64bo17b2o$13b2o12bo8b2o5bo74b2o$26bo17b3o5b2o
64b2o$24b2o20bo5b2o56b5o6b2o$108bo6bo5b3o$38b2o68bo4b2o6b2o$38b2o78b2o
7b2o$118b2o7bobo$129bo$106b2o3b2o16b2o$38bo68b5o$37b3o56bobo9b3o$36bo
3bo47bobo6b2o10bo$35bob3obo47b2o6bo24bo$36b5o48bo31bobo$121b2obo4b2o$
52bo68b2ob2o3b2o$51b3o38bobo26b2obo$50b2ob2o38b2o26bobo$49b3ob3o23b2o
12bo28bo$35b2o2bo9b3ob3o23b2o$37bobo9b3ob3o$39b2o8b3ob3o$40b2o8b2ob2o
22bo$38bob2o9b3o24bo18bobo$38b3o11bo25bo19b2o$98bo2$33b2o3b2o36b2o3b2o
$36bo42bo$33bo5bo21bo14bo5bo$34b2ob2o6bobo12b3o14b2ob2o$35bobo8b2o11b
2obo15bobo$36bo9bo12b3o17bo$36bo23b2o17bo3$75b2o$53bo20bo3bo$35b2o17b
2o17bo5bo$35b2o16b2o18bo3bob2o$44b2o27bo5bo176b2o$43bobo28bo3bo177b2o$
42b3o4b2o11b3o10b2o$41b3o4bo2bo2bo6bo3bo$42b3o4b2ob2obo133b2o$35b2o6bo
bo6bo3bo3bo5bo122b2o$34bobo7b2o6b5o3b2o3b2o190bo$34bo16b2o3b2o197b2ob
2o$33b2o17b5o130bo$53b3o7bo124bo65bo5bo$54bo7bobo123bo$62bobo178bo10b
2obob2o$43bo18bo140bo39bo$41bobo18bo123b2o3b2o9bobo37bobo$33b2o4b2o21b
o2bo123bo53bo15bo$33b2o4b2o22b2o121bo5bo50bo12bo2bo$39b2o146b2ob2o10b
3o38bo15bo$41bobo144bobo11b3o38bo11b2o$43bo145bo13bo38bobo10bo$189bo
53bo11bobo$243bo12b2o$203bo$149bo52b3o$63b3o11b3o61bo8b2o50b3o51b2o3b
2o$62bo3bo75b2o5b2o105bo5bo$61bo5bo8bo3bo60b2o48bobo51b2o$61b2obob2o8b
o3bo111b2o8bobo39bo6bo5bo3bo$186b3o3bo10bo41b3o3bo6b3o$77b3o25b2o38bo
39bo3bo50b2o6bo3bo$64bo40b2o39b2o36bo5bo49bobo5bo3bo$63bobo79b2o37b2ob
ob2o50bo6bo3bo$63bobo11b3o168b2ob2o$63b2o134bo$62bo13bo3bo24bo81bo12b
2o$61b3o12bo3bo23b3o79bobo10b2o7bobo48b2o$60bo3bo38bo3bo42bo35bobo20b
2o48b2o$59bob3obo11b3o22bob3obo42b2o34bo21bo39b2o$60b5o4bo33b5o42b2o
95bo3bo$70b2o114b2o58bo5bo$69b2o7bobo105b2o57b2obo3bo$79b2o111bo48bo4b
o5bo$79bo111bobo46bobo4bo3bo7b2o$189b2o3bo44bo3bo5b2o8bobo$189b2o3bo
45b3o18bo$189b2o3bo43b2o3b2o16b2o$186b2o3bobo$98b2o85bobo4bo$89bo8b2o
85bo$61b2o25bo5bo6b2o81b2o64bobo$61b2o25bob2o3bo5b3o98b2obob2o36bo4bo
2bo$69bo19b6o6b2o81b2o49bo10b2o5b2o6b2o$69b4o17b4o4b2o85bo16bo5bo24b3o
5bo9bo3b2o4b2o$70b4o24b2o85bobo5b2o37bo8bo11b2o$70bo2bo112b2o5b2o8b2ob
2o24b2o16bo2bo$70b4o12b2obob2o103b2o7bo44bobo$61b2o6b4o123b3o$60bobo6b
o16bo5bo103b2o$60bo18b3o111b2o$59b2o17bo3bo4b2ob2o101b2o34b3o$89bo138b
2ob2o$77bo5bo144b2ob2o$77b2o3b2o144b5o$71b2o154b2o3b2o$70bo3bo$59b2o8b
o5bo4bo8b2o$59b2o8bo3bob2o2bobo7b2o$69bo5bo3bobo$70bo3bo5bo$71b2o$232b
2o$232bo$233b3o$235bo28$111b2o20bo$113bo17b3o$100b2o12bo8b2o5bo$100b2o
4bo7bo8b2o5b2o$97b2o5b2o8bo$89b2o5b3o5bo2b2o4bo$89b2o6b2o6b5ob2o$100b
2o4bo$100b2o2$114bo$115bo$113b3o9b2o3b2o63bo17bobo$127b3o64b2o15b3ob3o
$126bo3bo47b2o13b2o4b2o2b2o5bo7bo$127bobo48b3o11b3o4b2o2b2o5b2o5b2o$
128bo15b2o34b2obo9b2o4b2o$118b3o23bo35bo2bo10b2o12bo$99bo2bob2obo2bo7b
o15bobo5bobo35b2obo11bo11b3o$98b2o2bo4bo2b2o7b3o11bo2bo5b2o27b2o5b3o
10bo14bo3bo$99bo2bob2obo2bo21b2o19b3o14bobo5b2o9bobo13bob3obo31b2o$
130b2o3bo10b2o7bo14bo19b2o14b5o6b2o3b2o18b2o$132b2o11bobo6bo14b2o46bo
5bo20bo$133bo2bo10bo$134bobo81bo3bo48bo$219b3o47b3o$198bo69bo$199bo68b
2o$116bo80b3o$116b3o$119bo58b2o3bo2bo3b2o22bo$118b2o32b2o24b5o4b5o22b
4o$153b2o23b2o3bo2bo3b2o23b4o$121bo30bo62bo2bo$120bobo92b4o46b3o$119bo
3bo90b4o13b2o13b2o16bo3bo$120b3o23bo53bo13bo14bo3bo12bobo14bo5bo$118b
2o3b2o21b2o50bobo27bo5bo11bo16bo5bo$145bobo51b2o22b2o2b2obo3bo31bo$
207bo15b2o3bo5bo29bo3bo17b2o$206bobo20bo3bo31b3o9bo8b2o$204b2o3bo21b2o
10b3o20bo9bo5bo6b2o$204b2o3bo9b2o21bo3bo29bob2o3bo5b3o5b2o$204b2o3bo9b
2o47b2o7b6o6b2o6b2o$53b2o151bobo32bo5bo20bo9b4o4b2o$53b2o152bo15b2o16b
2o3b2o21b3o14b2o$224bo46bo$118b2o104bobo7bo39b2obob2o$119bo84bo20b2o4b
4o$116b3o83b2ob2o23b4o40bo5bo16b2o$116bo113bo2bo63bo$52b3o146bo5bo22b
4o4b2o2b2o31b2ob2o5bo9bobo$231b4o5bo36bo6bobo8b2o$52bobo11b3o132b2obob
2o26bo47b2o3bo$51b5o10b3o156b2o55b2o3bo$50b2o3b2o10bo127bo29b2o55b2o3b
o$50b2o3b2o10bo126b2o45b2o41bobo$67bo125b2o4b2o3bo38bo41bo$66bobo114b
2o7b3o4b2o2bobo31b2o3bo52b2o$52b2o129b2o8b2o4b2o2bobo20bo9b2o40b2o15b
2o$51b2ob2o138b2o8bo20b3o9bob2o34b4obo$52bo2bo10bobo126bo28bo3bo9b2o
39bo$52bo14bo155bob3obo$55bo11bo108b2o46b5o$53b2o12bo99bo8bobo$66b3o
97bobo2b2o6bo$66b3o97bobobo2bo2bo2bo7b2o$48b2o3b2o112bo3b2o6bo7b2o52b
3o41b3o6b3o$49b5o5bo116bobo50b3o53bo7bo3bo$50b3o7b2o114b2o53bo8bo3bo
41bo5bo5bo$51bo7b2o103b2o3b2o59bo9bo3bo34bo12b2obob2o$164b2o3b2o107bob
o$131bo33b5o71b3o$129b4o33bobo18b2o103bo$123b2o3bobob2o53bo90b3o11b2o$
123b2o2bo2bob3o17b2o12b3o8bo7bobo53b3o34b3o$66bo3bo57bobob2o10bo6b2o
22bobo7b2o92bo11b2obo$67b2o2bo57b4o11bo8bo19b2o52b3o10bo3bo46b2o2bo$
50b2o15b2o2bo59bo11bobo27b2o51bo3bo9bo3bo47b4o$50b2o90b2ob2o26b2o50bo
5bo47bo$61bo79bo5bo27bobo47b2obob2o9b3o34b3o$60bobo81bo32bo100b3o9b2o
3b2o$60b2obo77b2o3b2o37b2o106bo$60b2ob2o35bo64b3o17b2o41bo61bo5bo$60b
2obo36b2o125bobo48bobo10b2ob2o$50b2o8bobo36bobo43bo23b2o56bobo49bo12bo
bo$49bobo9bo6b3o74bo82bo64bo$49bo17b2ob2o74bo146bo$48b2o17b2ob2o79bo
76b2o$67b5o21b2o56bobo74b2o$66b2o3b2o21b2o56bobo4b2o$93bo49b2o7bo2bo3b
2o16bo$59b2o91bobo21b2o7bo106b2o$57bo2bo90bobo22bobo5b3o105b2o$48b2o6b
o7b6o81bo31b5o$48b2o6bo6bo6bo111b2o3b2o$56bo7b2o4bo97b3o12b5o$57bo2bo
7b2o85b2o12bo13b5o$59b2o39bobo51b3o12bo13bo2bo$90b2o8bo2bo47bob2o5b2o
6b3o11bo3bo$89bo13b2o46bo2bo4bo2bo19bo$89b2o3bo6bo3b2o12bo2bob2obo2bo
20bob2o5b2o6b3o11bob2o$66bo2bob2obo2bo16bo8b2o14b4ob2ob4o9b2o12b3o11b
3o12bo$65b2o2bo4bo2b2o14bo6bo2bo15bo2bob2obo2bo7bobo14b2o3bo$66bo2bob
2obo2bo22bobo34bob2o18bobo6b3o$159bobo7bo10b2o3b2o$84b2o61b3o10bo8bo
10bo5bo$85b2o60b3o18b3o$84bo61bo3bo30bo3bo$107bo25b2o22b2obob2o18b3o$
106b3o25b2o9b2o3b2o5bo5bo$105b5o23bo24bo3bo$104bobobobo48b3o$77bo14b2o
3b2o5b2o3b2o9b2o$65b2o10b2o15b3o21bo2bo$65b2o9bobo14bo3bo19bo7b3o3bo$
56b2o3bo6b2o12b2o10bobo20bo6bo3b5o49b2o$56bobo3bo5b3o10bo3bo9bo21bo7bo
3b2ob2o48b2o$57b5o6b2o10bo5bo24b2o5bo2bo3bo3b2ob3o8b2o5b2o$58b3o4b2o
13bo3bob2o2b2o5b2o5b2o4bobo7b2o5b4ob2o9b2o5bo$65b2o13bo5bo3b2o5bo7bo4b
o18b4o18b3o5b2o$81bo3bo12b3ob3o4b2o20bo21bo5b2o$82b2o16bobo!

Edit:
Here's the 8-glider version:
x = 226, y = 195, rule = B3/S23
174b2o5bo20bo$174b2o5b3o18bobo$184bo5b2o11bobo7bo$183b2o5b2o11bo2bo6b
2o$203bobo2b2o4b2o$202bobo3b2o4b3o7b2o$202bo5b2o4b2o8b2o$213b2o$213bo$
127b2o54b2o3b2o11bo$126bo2bo44bo11bo13bo$126bo46b3o7bo5bo10b3o$126bo
45b5o7b2ob2o$126bobo42b2o3b2o7bobo$126bobo43b5o9bo$127bo44bo3bo9bo$
173bobo$174bo18bo11b2o6b2o$124b2o3b2o47b2o13bobo8bo2bo4bo2bo$124bo5bo
9b3o35bobo12b2o8b6o2b6o$141bo31b2o4b3o22bo2bo4bo2bo$125bo3bo11bo30bo2b
o4b3o22b2o6b2o$126b3o11b3o30b2o4b3o8b3o$178bobo$140b3o35b2o$140b3o$
208b2o$140b3o16b2o19b2o26b2o4b3o$141bo18bo19bo24b2o6b5o$130bo10bo18bob
o6bobo6bobo23b3o5bo3bobo$128bobo9b3o18b2o5bo2bo6b2o17bo7b2o6bo3b2o$
129b2o36b2o26b2ob2o8b2o$165b2o3bo37b2o$125bo41b2o25bo5bo$124b3o41bo2bo
$123b5o41bobo22b2obob2o$122b2o3b2o8bo79b2o$123b5o10bo78bo$92b2o29bo3bo
8b3o71bo4bobo$92b2o30bobo82bobo3b2o$125bo43bo38bo3b2o$168bo8bo30bo3b2o
$144bo23b3o5bo31bo3b2o$124b2o17b2o31b3o30bobo$124b2o17bobo64bo$132bo9b
3o9bo60b2o$130bobo9b2o11bo26bo12b2o18b2o$91b3o11b3o20b2o12b2o9b3o26b3o
10b2o$90bo3bo33b2o55bo29bo$89bo5bo8bo3bo19b2o54b2o28bobo$89b2obob2o8bo
3bo15b2o4bobo69b2o10bobo$123bobo6bo68b2o12bo$105b3o15bo79bo$92bo29b2o
16b2o3b2o$91bobo46b2o3b2o65b2obob2o$91bobo11b3o33b5o66bo5bo$91b2o49bob
o68bo3bo$90bo13bo3bo22b2o40bo25bo10bo3b3o$89b3o12bo3bo22bobo8b3o27b3o
10b5o8bobo8b2o$88bo3bo29b2o2b2o6bo36b2ob2o8bob3obo18bobo$87bob3obo11b
3o14b2obo2bo2bo2bo35b3ob3o8bo3bo$88b5o4bo28b2o6bo35b3ob3o9b3o9b3o$98b
2o31bobo36b3ob3o10bo10b3o$97b2o32b2o37b3ob3o22bo$171b2ob2o$172b3o38bo$
103b2o68bo15bo9bo13bo$103b2o84bo8b3o11bobo$104bo2b2o73bo5bobo7b3o10b2o
b2o$182bobo2b2ob2o18bo5bo$105b2o75b2o2bo5bo20bo$5b2o182bo8bobo9b2o3b2o
$5b2o82b2o95b2o3b2o6bo$89b2o$69b2o26bo116bo$69b2o26b4o74bo12bo25bo$98b
4o72bo13bo26bo$98bo2bo63bo8b3o10bo$4b3o91b4o51b2o10bobo$3b2ob2o11bo51b
2o16b2o6b4o51bo3bo5bo2b2o45b2o$3b2ob2o11bo68bobo6bo53bo5bo3bobo25b2o
21b2o$3b5o80bo18b3o41bo3bob2o2bobo25b2o$2b2o3b2o10bo36bo30b2o17bo3bo
40bo5bo4bo19b2o$18bobo35bo86b2o7bo3bo24bobo$67b2o3b2o31bo5bo30bobo8b2o
25b3o$4b2o12b3o35bo11b5o32b2o3b2o30bo16b2o3b2o13b3o$3b5o47bobo10b2ob2o
26b2o40b2o16bo5bo14b3o$3bo64b2ob2o25bo3bo43b2o33bobo5b2o$5b3o10b3o34b
3o11b3o15b2o8bo5bo4bo37b2o12bo3bo17b2o5bobo$7bo79b2o8bo3bob2o2bobo51b
3o27bo$5b2o11bobo76bo5bo3bobo81b2o$5b2o12bo35b3o40bo3bo5bo62bo$99b2o
69b3o$19bo35bobo58bo28b3o21b5o$2o3b2o12bo36bo59bobo5bo20b3o20b2o3b2o6b
o$obobobo59bo49b2o6bobo17bo3bo20b5o5bobo$b5o5bob2ob2o38bo9bobo3bo51b2o
35b2o6bo3bo3b2o12b2o$2b3o7b4o2bo37bo9b2o3b3o69b2o3b2o11b2o7bobo4b2o12b
2o$3bo7bobo2b2o52b5o96bo5b2o$11b3o7b2o46bobobobo44bo10b3o45bobo$11b3o
6bobo46b2o3b2o44bobo8bobo47bo$10bo3bo6bo79bo18b2o9b3o$10b2ob2o44bo39b
2o30b3o13b3o$58bo13bo27b2o29b3o10b2o$49bo8b3o10bobo57b3o10b2o$2b2o45bo
bo19bobo57bobo9b2o$2b2o45b2o21bo58b3o10bobo$13bo58b2o71b2o$12b4o56b2o$
11b2obobo55b2o$10b3obo2bo49bo77b2o3b2o$11b2obobo49b4o75b2o3b2o$2b2o8b
4o4b3o42b2obobo63bo$bobo9bo6b3o41b3obo2bo61bo2bo10b3o$bo17bo3bo41b2obo
b2o62b3o3b2o5b3o$2o64b4ob3o55b2o4bobo2b2o6bo$18b2o3b2o42bo4bobo54bobo
4b3ob3o$27bo46bo55bo5b2o3b2o$27b3o44b2o61b2ob2o$11b2o5b2o10bo77bo$10b
3o3bo4bo7b2o20b2o3b2o16b2o31bobo$2o5bob2o5bo57bo30b2o3bo37b2o$2o5bo2bo
4bo6bo29bo3bo8b2o5bobo30b2o3bo37b2o$7bob2o9bobo30b3o8b3o5b2o31b2o3bo
28bo$10b3o40b3o5bob2o37b2o3bobo29b2o$11b2o48bo2bo36bobo4bo25b2o4b2o$
61bob2o36bo18b3o11b2o4b3o$29b2o3b2o28b3o33b2o17bo3bo6bo3b2o4b2o$29b2o
3b2o29b2o51bo5bo4b3o7b2o7b2o$30b5o83b2obob2o3bo3bo6bo8bobo$31bobo93bob
3obo16bo$128b5o17b2o$31b3o87bo$120bobo$120bobo$121bo18bo$34b2o99bo4b4o
$34bo85b2o13bo5b4o5b2o$35b3o82b2o19bo2bo5b2o$37bo103b4o$23bo116b4o$21b
obo116bo54b2o$20bobo172bo$14b2o3bo2bo170bobo$14b2o4bobo170b2o$21bobo$
23bo2$34b3o$33bo3bo$14b2o16bo5bo$15bo16bo5bo$15bobo7b2o8bo$16b2o5bo2bo
10bo$22bo7b2ob4o$22bo6bo2b4o151b2o$22bo7b2o29b2o124bo$23bo2bo34bo2bo9b
o113b3o$25b2o29b2o7bo7bobo114bo$16b2o37bo2bo6bo8b2o12b2o6b2o$16b2o16b
3o19b2o7bo9b2o9bo4bo2bo4bo$34b2obo23bo2bo11b2o8bo4bo2bo4bo$32bo4bo23b
2o12b2o9bo4bo2bo4bo$33b4o20bo19bo10b2o6b2o$33b2o21b3o$55bo3bo$16b3o8b
2o28bo10b3o$15b2ob2o6bobo25bo5bo6b2ob2o$15b2ob2o8bo25bo5bo6b2ob2o12bo$
15b5o35bo3bo7b5o11b2o$14b2o3b2o35b3o7b2o3b2o10bobo2$96b2o$20bo75bobo$
19bob2o9b3o51bo4b2o6bo7b2o$19bo11bo3bo49bobo2bo2bo2bo2bo7b2o$30bo5bo
48b2obob3o6bo$19b2obo43b2o5b2o10b2ob2o6bobo$17bo2bo8bo7bo29bo5b2o10b2o
bo7b2o$17bobo9bo7bo19b2o5b3o18bobo$57b2o5bo21bo$30bo5bo$31bo3bo$32b3o$
18b3o$17bo3bo$16bo5bo$17bo3bo$18b3o$18b3o4$19b2o$19b2o!

Edit: Added an eater to the above pattern.
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Re: c/7 orthogonal spaceships

Postby 137ben » February 19th, 2013, 2:04 am

Wow! The whole time we were still doing the soup search, I was waiting and waiting for a nonstandard small ship to show up naturally. But it's been there the whole time AND it is at a new velocity :o :shock:
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Re: c/7 orthogonal spaceships

Postby Tropylium » February 19th, 2013, 4:19 pm

There are zillionplexes of 20-cell patterns, and most of them are going to occur naturally incredibly rarely. Besides, oscillators and slow spaceships will presumably have less of a chance of being detected than faster ones, due to lesser chances of survival. If soup searches DO turn up a non-standard spaceship eventually, I bet it would be faster than this one.

Sokwe wrote:Still, we might be as well off trying to find new c/6 orthogonal spaceships, as we still don't have any puffers for that speed.

From around p7-ish, 2c/6 is also a search option.

(Also I've said this before, but the fact that the four natural spaceships AND the switch engine are all glide-reflective makes me wonder how so few glide-reflective "artificial" ships have been sought yet.)
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Re: c/7 orthogonal spaceships

Postby Sokwe » February 19th, 2013, 4:50 pm

I really like Dave Greene's name for this ship, "loafer", as it describes both its slow movement, and the fact that it pushes a loaf. @Velcrorex, what do you think?


Tropylium wrote:The fact that the four natural spaceships AND the switch engine are all glide-reflective makes me wonder how so few glide-reflective "artificial" ships have been sought yet.

The problem with such spaceships is they are limited to even periods greater than 2, so they quickly become difficult to search for. Since 4 is a reasonably small period, we have been able to find many glide symmetric c/2 orthogonal and c/4 diagonal ships. There have been a number of p6 c/3 glide symmetric ships using p3 supporting components, but beyond this, these are the only ships I know of where the glide symmetric component was found directly (first by Jason Summers, middle two by Nicolay Beluchenko, last by Josh Ball):
x = 210, y = 55, rule = B3/S23
4b2obo7b3o46b2o52b2o80bobobo$4bo3bo6bo47b3ob3o47b3ob3o75b7o$4bo4bo7bo
7b2o38bo3b2o48bo3b2o74bo5bo$6b2o7bobo4b2obo36b2ob2o2bo2bobo41b2ob2o2bo
2bobo71bo3bo$3o5bobo4b3obo2b2o38bo6bob4o41bo6bob4o71bo3bo$o13bo3b2o2b
2o44b2obo2bo47b2obo2bo69b2o5b2o$3bo6b2ob4ob2o42bo4b2o3bob2o40bo4b2o3bo
b2o70bo3bo$o2bo7b7o44b2o8bobo2bo38b2o8bobo2bo65bobobobobobo$bo2bo57bo
2b5ob3o4bo37bo2b5ob3o4bo66bobobobo$2bo60bo9bo4bo38bo9bo4bo63b2obobobob
ob2o$4bobo56b2obo2bo3bo3bo39b2obo2bo3bo3bo64bo3b2ob2o3bo$6b2o56bo9b2o
42bo9b2o$7bo63b2o2b2o4bo43b2o2b2o4bo59b2o3bo3bo3b2o$6b2o6b3o47bo3b2obo
4b3o2bo36bo3b2obo4b3o2bo64bo3bo$5b3o6bo2bo47b2obob5o5bob2o35b2obob5o5b
ob2o63b3o$2ob2ob2o5bo3bo51b2ob2ob2ob2o2b3o38b2ob2ob2ob2o2b3o$o3bob2o7b
o63bobo4bo46bobo4bo58b2o4bo$ob3o2bo4bo4b2o51b2o4bobo3b6o36b2o4bobo3b6o
58b2o2bobo$5b2o6bo6bo54bo7b2o44bo7b2o59bobo2bo$4b3o8b3o3bo53bo3bo49bo
3bo64bobo2bo2bo$21bo53bo4bo3b3o6bo35bo4bo3b3o6bo51bo3bobo$19bo56b5o3b
2ob2o2b2ob2o34b5o3b2ob2o2b2ob2o$3b3o14bo58b2obo2bob2o2bo41b2obo2bob2o
2bo$3b3o72b2o5bo4bo2b3o36b2o5bo4bo2b3o$77b3obobobobo43b3obobobobo$2b2o
80bo2bo50bo2bo$2bo77bobo51bobo9bo3bo$81bo53bo8b6obo$142b2o3b4obo$83b3o
51b3o5bo4bo3bo$83b3o51b3o2b3o6bo3bo$142bo9b2ob2o$82b2o52b2o13b2o2bo2b
2o$82b2o52b2o3bo8bobo4bo2bo$83bo53bo3bobo5bo$142b3o4bobo5bob2o$144b3o
2b2o9bo$148b2o5bobo2b2o$145b2obo4b2obobob2o$146bob2o3bob2o4bo$153bobo$
153b2obo2b2o$147bo3bo3b3o3bo$147b2o2bo2bo4bo2bo$151b2o5bo5b3o$153bo4b
5obo$154bo2b2o2bo5bo$165bob2o$160bo4bo$160bo5b2ob2o$159bo2b2o$160b3o$
162bob2o$164bo$163bo!
-Matthias Merzenich
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Re: c/7 orthogonal spaceships

Postby Tropylium » February 19th, 2013, 8:32 pm

Sokwe wrote:
Tropylium wrote:The fact that the four natural spaceships AND the switch engine are all glide-reflective makes me wonder how so few glide-reflective "artificial" ships have been sought yet.

The problem with such spaceships is they are limited to even periods greater than 2, so they quickly become difficult to search for.

Why does the period matter though? I mean, if searching for these in particular, obviously you wouldn't just scour the whole search space and hope that any results had some extra symmetry, but set an obvious symmetry restriction in place to begin with. Thus standard spaceships should be found in a p2 search, etc.
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Re: c/7 orthogonal spaceships

Postby Sokwe » February 19th, 2013, 9:07 pm

Tropylium wrote:Why does the period matter though? I mean, if searching for these in particular, obviously you wouldn't just scour the whole search space and hope that any results had some extra symmetry, but set an obvious symmetry restriction in place to begin with. Thus standard spaceships should be found in a p2 search, etc.

A search for a glide symmetric spaceship of period 8 would be akin to a period-4 asymmetric search of the same width. From what I've seen, glide-symmetric ships do not seem to be too much thinner than a bilaterally-symmetric ship of the same speed.
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Re: c/7 orthogonal spaceships

Postby skomick » February 20th, 2013, 1:06 am

Here's a p180 loafer gun:
x = 183, y = 155, rule = B3/S23
71bo12bo$71b3o10b3o$74bo12bo$73b2o11b2o$49bo$49b3o23b3o$52bo22b3o$51b
2o21bo3bo$73bo5bo65b2o21b2o$74bo3bo10bo16b2o36bobo21bo$75b3o10b3o14bob
o35b3o12bo7bobo$53b3o31b5o3b2o7b3o12bo22b3o8b2o3b4o4b2o$52b2ob2o29b2o
3b2o2b2o6b3o8b2o3b4o20b3o8b2o3b4o$52b2ob2o47b3o8b2o3b4o12b2o6bobo2b2ob
ob2o3bo2bo$52b5o48bobo2b2obob2o3bo2bo11bobo7b2o2b2obobo4b4o$51b2o3b2o
18bobo27b2o2b2obobo4b4o11bo15b2obo3b4o$75bo2bo9b3o21b2obo3b4o4b2o5b2o
22bo$73bob2o11b3o9b2o17bo7bobo$53b2o45b2o27bo16b2o$52b5o19bo10bo41b2o
15b2o9b2o$52bo20b2obo9bobo15b2o51b2o$54b3o8b2o8bo9bo3bo15bo$56bo8b2o
19b3o54bo$54b2o28b2o3b2o4bo8bo36bo2b2o$54b2o19b2o3b2o11bobo7bo36bo4bo
5b2o$76b5o13b2o7bo25b2ob2o6b2ob2o6b2o3b3o$59b2o15b2ob2o28b2o19bobo2bo
20b3o$49b2o3b2o3b2o7b2o6b2ob2o29bo19bo3b2o10bo8bo3bo$49bobobobo8b2o11b
3o30bobo9bo5bobo15bo$50b5o9bobo44b2o8b4o3b2o24b2o3b2o$51b3o9bo2bo38bob
o12b2obobo$52bo53b2o11b3obo2bo$64bobo22b2o15bo13b2obobo$65b2o22bo31b4o
28b2o8bo$78b2o10b3o9b2o18bo30bobo7b3o$78b2o12bo10bo49bo12bo$54b2o46bo
62b2o$54bo47b2o$55b3o9b2o84bo$57bo10bo$67bo$67b2o98b3o$45bo91b2o27bo3b
o$43b3o90b2o16b3o$42bo95bo14bo3bo7bo5bo$42b2o87bo20bo5bo6b2o3b2o$67bo
61b3o20bo5bo$65b3o60bo26bo$64bo63b2o23bo3bo10bo$64b2o88b3o10bob2o$23bo
131bo11bo$23b3o11b2obob2o18bo63bo40bo3bo$26bo10bo5bo17b3o61b3o40bo2bo$
25b2o11bo3bo17bo3bo59bo3bo26b2o11b5o$bo37b3o17bob3obo57bob3obo25b2o11b
5o$b3o56b5o59b5o38b2o3b2o$4bo163b5o$3b2o156bobo5b3o$161b2o7bo$5b3o17b
2o3b2o36b2o19b2o71bo$5b3o17bobobobo37bo19bo55bob2o$4bo3bo17b5o11bo18bo
2b2o3bobo5b2o8bobo55b2obo$3bo5bo17b3o13bo17bobo6b2o5b2o8b2o75b2o$4bo3b
o19bo12b3o6b2o8b2o18b2o82b2o$5b3o42b2o7b2o19b3o45b2o$59b2obo17b2o46bo$
46b2o12b3o14b2o50b3o$46b2o29b2o12bo39bo38b2o$36b5o49bo8bo70b2o$4bobo
28bob3obo19b2o3b2o22b3o5bo59b3o$4bo2bo17bobo8bo3bo23bo33b3o9b2o46bo$6b
2obo7b2o6b2o10b3o21bo5bo38bo3b2o35b2o10bo9bo$17b2o7bo11bo14bobo6b2ob2o
38bobo40bo19bobo$6bo46b2o8bobo29bo8bobo41bobo5bobo8bob2o$6bob2o44bo9bo
29bo9bo44b2o5bo2bo6b2ob2o$7bo21b3o32bo29b3o6b2o54b2o6bob2o$28bo3bo4b2o
35bobo40b2o38bo3b2o5bobo8b2o$19bo7bo5bo3b2o35b2o40bobo40b2o8bo9bobo$b
2o3b2o9b2o9bo3bo9bo18b2o12bo30b2o7bo13bobo24bo2bo21bo$2b5o11b2o9b3o9bo
20bo43b2o7bo2bo6b2o2bo2bo23bobo22b2o$2b2ob2o22b3o9b3o4b2o9b3o53bo8bobo
5b2o$2b2ob2o5bo5bo29bo10bo56bobo3bo3bo3bo3b2o$3b3o6bo5bo30bo67b2o2b2ob
3o5b2o$12bo5bo29b2o74b2o3bo2bo5b2o$30b2o97bobo6bobo$14b3o13b2o108bo$6b
2o132b2o$6bo108bo$7b3o9b2o94bobo$9bo10bo79bob2o11b2o$17b3o80b2obo$17bo
101b2o$111b3o5b2o$18bo$18b3o84b3o$21bo$20b2o87bo3bo$14b2o93bob3o$12bo
2bo7bo85bob2obo$22b3o$11bo9bo3bo76b2o21b2o$23bo79bo21bobo$12b2o6bo5bo
76bobo9bo4b2o6bo$14bo5bo5bo77b2o8bobo2bo2bo2bo2bo$21bo3bo88b2obob3o6bo
$22b3o89b2ob2o6bobo6b2o$11b2o3b2o96b2obo7b2o7bobo$11b2o3b2o96bobo19bo$
12b5o98bo20b2o43b2o$13bobo165bo$179bobo$13b3o163b2o$25b2o$25bo$26b3o$
28bo2$17bo$18bo$16b3o$12bo$11b3o$10b5o158b2o$9b2o3b2o54b2o101bo$34b2ob
o33bo102b3o$25bo8bob2o32bo105bo$17b2o4bobo44b2o$11b3o3b2o5b2o$11b3o13b
o$27b2o$26bobo$11b2o$11b2o$75b3o$75bo$8bo25b2o35bo4bo$6b4o6b2o2b2o12bo
36b2o$5bobob2o5b4obo2bobo5bobo35bobo$4bo2bob3o5b2obo3bo3bo3b2o$4b2obob
2o4bo12bo$2b3ob4o14bo4bo53b2o$bobo4bo19bo54bobo$bo22bo3bo43b2o9bo$2o
22bobo36b2o7b2o$64b2o$63bo11bo$52b2o20bobo14b2o8bo$51bo3bo18bobo14bo2b
o6bobo$50bo5bo7bo7bobobobo7b2o2bo3bo7bobo4b2o$40b2o8bo3bob2o4bobo7b2o
3b2o6b3o2b2o2bo7bo2bo3b2o$40b2o8bo5bo3b2o20bob2o16bobo$51bo3bo4b2o20bo
2bo8b3o4bobo$52b2o6b2o20bob2o15bo$62bobo20b3o$64bo21b2o!
Shannon Omick
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Re: c/7 orthogonal spaceships

Postby glider_rider » February 20th, 2013, 6:35 pm

It can be eaten by a single eater 1.

x = 10, y = 13, rule = B3/S23
2bo$b5o$o5bobo$bo2b2obo$2b2o$8bo$6bob2o$5bo2bo$5bo2bo$2b2o2b2o$bobo$bo
$2o!
Nico Brown
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Re: c/7 orthogonal spaceships

Postby dvgrn » February 20th, 2013, 8:31 pm

Just for variety, here's a big pile of blocks:

x = 149, y = 185, rule = B3/S23
16b2o4b2o$16b2o4b2o2$2o$2o5$2o11b2o$2o11b2o36b2o$51b2o$9b2o$9b2o$46b2o
$46b2o$71b2o$71b2o3$66b2o$66b2o14$121b2o$121b2o$23b2o41b2o$23b2o41b2o$
119b2o$119b2o$61b2o$27b2o32b2o$27b2o89b2o$118b2o$41b2o$41b2o2$117b2o$
53b2o62b2o$45b2o6b2o$45b2o$112b2o$112b2o$57b2o$57b2o74b2o$133b2o2b2o$
137b2o$141b2o$141b2o2$101b2o$101b2o4$100b2o11b2o$80b2o18b2o11b2o2b2o$
80b2o35b2o$121b2o$121b2o2$79b2o4b2o$79b2o4b2o3b2o$90b2o$102b2o$102b2o
3b2o$107b2o3b2o$64b2o46b2o$64b2o3b2o$69b2o67b2o$81b2o55b2o$81b2o3b2o$
58b2o26b2o3b2o4b2o48b2o$58b2o31b2o4b2o48b2o$114b2o$114b2o2$62b2o32b2o$
62b2o12b2o18b2o49b2o$76b2o29b2o9b2o27b2o$107b2o9b2o$63b2o$63b2o$75b2o$
75b2o2$59b2o$59b2o$98b2o4b2o$98b2o4b2o6$50b2o$50b2o2$110b2o$110b2o$54b
2o$54b2o$111b2o$87b2o22b2o$87b2o14b2o$43b2o58b2o2b2o$43b2o3b2o46b2o9b
2o3b2o$48b2o46b2o14b2o3$69b2o$69b2o3$38b2o$38b2o25b2o$65b2o5$52b2o75b
2o$52b2o75b2o2$138b2o$138b2o$60b2o$60b2o3$61b2o75b2o$61b2o75b2o2$127b
2o$127b2o3$122b2o$122b2o33$146b!

... But if you add a glider in just the right place, you'll get a loafer. I've removed the glider in case anyone wants to try and figure it out -- but I'm afraid this kind of puzzle will never replace Sudoku. There's actually a big hint in the RLE, if you need one. Experimentation to find the various one-time-turner chains is a good idea, of course, but no fair using a script like pd-glider.py to find the answer for you. If you're going to do that, just try the pattern below instead:

#C spoiler alert:
#C   Blockic construction of a loafer
x = 154, y = 190, rule = B3/S23
16b2o4b2o$16b2o4b2o2$2o$2o5$2o11b2o$2o11b2o36b2o$51b2o$9b2o$9b2o$46b2o
$46b2o$71b2o$71b2o3$66b2o$66b2o14$121b2o$121b2o$23b2o41b2o$23b2o41b2o$
119b2o$119b2o$61b2o$27b2o32b2o$27b2o89b2o$118b2o$41b2o$41b2o2$117b2o$
53b2o62b2o$45b2o6b2o$45b2o$112b2o$112b2o$57b2o$57b2o74b2o$133b2o2b2o$
137b2o$141b2o$141b2o2$101b2o$101b2o4$100b2o11b2o$80b2o18b2o11b2o2b2o$
80b2o35b2o$121b2o$121b2o2$79b2o4b2o$79b2o4b2o3b2o$90b2o$102b2o$102b2o
3b2o$107b2o3b2o$64b2o46b2o$64b2o3b2o$69b2o67b2o$81b2o55b2o$81b2o3b2o$
58b2o26b2o3b2o4b2o48b2o$58b2o31b2o4b2o48b2o$114b2o$114b2o2$62b2o32b2o$
62b2o12b2o18b2o49b2o$76b2o29b2o9b2o27b2o$107b2o9b2o$63b2o$63b2o$75b2o$
75b2o2$59b2o$59b2o$98b2o4b2o$98b2o4b2o6$50b2o$50b2o2$110b2o$110b2o$54b
2o$54b2o$111b2o$87b2o22b2o$87b2o14b2o$43b2o58b2o2b2o$43b2o3b2o46b2o9b
2o3b2o$48b2o46b2o14b2o3$69b2o$69b2o3$38b2o$38b2o25b2o$65b2o5$52b2o75b
2o$52b2o75b2o2$138b2o$138b2o$60b2o$60b2o3$61b2o75b2o$61b2o75b2o2$127b
2o$127b2o3$122b2o$122b2o38$151b3o$151bo$152bo!

EDIT: On another thread, 15 March 2013, I posted a unidirectional P1 slow salvo that creates this seed from a single block, then triggers it to build a loafer.
dvgrn
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