Thread For Your Useless Discoveries

For discussion of specific patterns or specific families of patterns, both newly-discovered and well-known.
mniemiec
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Re: Thread For Your Useless Discoveries

Post by mniemiec » July 19th, 2016, 9:19 pm

gmc_nxtman wrote:A weird reaction/component with the "pierce" catalyst: ...
Before considering the usefulness of such a catalyst, it is important to determine whether or not the scenario envisioned is even possible - i.e. is it possible to get that spark in the position indicated, without it having already interacted with the still-life on a previous geenration? This is impossible in this situation.

In the top row of 3 live cells, at most one could have been alive in the previos generation. If the middle one was not alive, for the left one to be born, it would require a line of 3 below, which interacts with the still-life. Therefore, the middle cell alone must have been alive on the previus generation, with the other two having two additional neighbors. For the left cell, the two neighbors must have formed an L-tromino with the top middle cell.

The leftmost cell could not have been there, or it would have interacted earlier, so it must be a birth. One of its parents is already spoken for, from the L tromino, so the two others must be on the row below it, which can happen in 3 ways. In the case of oob, this leaves an unwanted survival, so we must change it to oobo, which suppresses the necessary bottom cell. In the case of obo, we must also suppress the same survival, and oboo works nicely; unfortunately, this causes an extra birth where the 'b' cell is, and the only way to suppress that is either another live cell below left (which interferes with the still life), or below center or right (which suppresses the necessary bottom cell). Finally, in the case of boo, the leftmost live cell must be killed by two cells below, one of which will kill the necessary bottom cell.

Thus, there are no predecessors that can produce the indicated spark without having previously interacted with the catalyst.

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Extrementhusiast
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Re: Thread For Your Useless Discoveries

Post by Extrementhusiast » July 19th, 2016, 11:24 pm

mniemiec wrote:[portions cut]

Thus, there are no predecessors that can produce the indicated spark without having previously interacted with the catalyst.
Maybe not that particular spark, but there is a predecessor for an equivalent spark:

Code: Select all

x = 13, y = 12, rule = LifeHistory
4.2A$4.A.A$2.2A2.A$3.A.A.2A$3.A.A2.C$2A.A.AC$2A.A5.A$3.A4.3A.A$3.2A2.
2A.2A$8.A$7.2A$7.3A!
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muzik
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Re: Thread For Your Useless Discoveries

Post by muzik » July 20th, 2016, 3:56 am

Bipond thing

Code: Select all

x = 8, y = 6, rule = B3/S23
o5b2o$o5b2o$2o$bo$2o$2o!

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muzik
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Re: Thread For Your Useless Discoveries

Post by muzik » July 20th, 2016, 8:20 am

Known reaction?

Code: Select all

x = 15, y = 11, rule = B3/S23
12bobo$12b2o$4bo8bo$3bobo$3bobo$b3ob3o$o7bo$b3ob3o$3bobo$3bobo$4bo!

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BlinkerSpawn
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Re: Thread For Your Useless Discoveries

Post by BlinkerSpawn » July 20th, 2016, 12:46 pm

muzik wrote:Known reaction?

Code: Select all

x = 15, y = 11, rule = B3/S23
12bobo$12b2o$4bo8bo$3bobo$3bobo$b3ob3o$o7bo$b3ob3o$3bobo$3bobo$4bo!
This was talked about earlier, but I don't remember where. Search for "caribou hassler".
LifeWiki: Like Wikipedia but with more spaceships. [citation needed]

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gmc_nxtman
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Re: Thread For Your Useless Discoveries

Post by gmc_nxtman » July 20th, 2016, 12:52 pm

BlinkerSpawn wrote:
muzik wrote:Known reaction?

Code: Select all

x = 15, y = 11, rule = B3/S23
12bobo$12b2o$4bo8bo$3bobo$3bobo$b3ob3o$o7bo$b3ob3o$3bobo$3bobo$4bo!
This was talked about earlier, but I don't remember where. Search for "caribou hassler".
Here:

viewtopic.php?f=2&t=279&p=23921#p23921

And the pattern itself:

Code: Select all

x = 99, y = 78, rule = B3/S23
67b2o5b2o$63b2o2b2o5b2o2b2o$63b2o13b2o6$68bo5bo$67b3o3b3o$67bob2ob2obo
$69b2ob2o$69b2ob2o$69b2ob2o11$69bo$68bo$54b2o5b2o5b3o$54bo7bo$29b2o5bo
18b3ob3o$29b2o4bobo19bobo$34bo3bo18bobo$34bo3bo19bo13b2ob2o$33b3ob3o
15bo15bo5bo$34bo3bo16b2o$34b2ob2o15bobo13bo7bo$35bobo32bo2bobo2bo$36bo
33b3o3b3o5$31bo3bo$31bo3bo$72b2ob2o$43b2o21b2o5bobo$28b2obo3bob2o5b2o
19b2o6bobo20b2o$29b3o3b3o5bo6b2o15bo6bo21b2o$b2o27bo5bo12bobo$b2o48bo
31bo$13bo68b2o13b2o$12b2o8b2o32bo24b2o14b2o$2o9b3obo5bo2bo29bo3b2o9b2o
11b2o2b2o$2o8b2o8b2ob3o27b2obob2o9bobo$11b2o8b2obo27b2o6bo10bo$12bo10b
o29b2obob2o9b3o$54bo3b2o22b2o2b2o$12bo43bo24b2o14b2o$11b2o69b2o13b2o$
2o8b2o13b2o11b3o28b3o11bo$2o9b3obo9b2o13bo11b2o17bo$12b2o25bo12b2o15bo
bo24b2o$13bo55b2o25b2o$b2o$b2o$22b2obo$17b3o2b2o2bo$18b2o6bo$6bo12b3o
3b2o3b3o3bo$4b3o13bo3bo3b5o2bobo$3bo23b2o3b2o3bo$4b3o13bo3bo3b2o3bo2bo
$6bo12b3o3b2o2bo3b3o$18b2o6bo$17b3o2b2o2bo2bo3b3o$22b2obo2b2o3bo2bo$
27b2o3b2o3bo12b2o$28b5o2bobo12b2o$30b3o3bo!
EDIT: By the way, that pattern can be reduced:

Code: Select all

x = 86, y = 59, rule = B3/S23
74b2o$57b2o14b2ob2o6b2o$57b2o15bo2bo6b2o$74bo2bo$75b2o2$58b3ob3o10b2o$
57bob2ob2obo8bo2bo$29b2o25b2o7b2o7bo2bo6b2o$29b2o26bob2ob2obo7b2ob2o6b
2o$58b3ob3o9b2o3$70bo$60b2o8b2o$59bo2bo5bob3o11b2o$58b3ob2o8b2o10b2o$
29b3o3b3o33b2o$28bo2bo3bo2bo3b2o5b2o9bobo8bo$28b2obo3bob2o3bo7bo9b2o$
43b3ob3o10b2ob2o6bo$45bobo14b2o7b2o$46bo25b2o10b2o$68bob3o11b2o$57bob
2o9b2o$55b3ob2o9bo$54bo$b2o52b3ob2o$b2o54bobo$11b2o16bo27bobo$13bo14b
2o25b3ob2o$2o8b2o2bo13b2o24bo$2o9bo2bo40b3ob2o13b2o$12bobo42bob2o12b5o
$12b2o59bo4bo5b2o$28b2o43b3o2bo5b2o$12b2o60bo2b2o$12bobo60b2o$2o9bo2bo
10b2o$2o8b2o2bo10b2o48b2o$13bo49bo10bo2b2o$11b2o46b2o12b3o2bo5b2o$b2o
55b2o13bo4bo5b2o$b2o30b2o25bo12b5o$10b3o3bo15bobo39b2o$8b5o2bobo16bo$
12b2o3bo25bo$6bob2o3bo2bo21bo3bo29b2o7b4o$4b3ob2o3b3o21bo7bo25bo2bo6bo
3bo$3bo33bo2b2o5bo22b2o2bo10bo$4b3ob2o3b3o22b2o5b2obo22bo2bo4bob2obo$
6bob2o3bo2bo22b3o3b2ob3o21bo6b3o$12b2o3bo33bo$8b5o2bobo21b3o3b2ob3o21b
o6b3o$10b3o3bo21b2o5b2obo22bo2bo4bob2obo$37bo2b2o5bo9b2o11b2o2bo10bo$
37bo7bo11b2o12bo2bo6bo3bo$38bo3bo29b2o7b4o$43bo!

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muzik
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Re: Thread For Your Useless Discoveries

Post by muzik » July 21st, 2016, 4:50 am

Ark:

Code: Select all

x = 17, y = 16, rule = B3/S23
11b3o$14b3o$14b3o$15bo6$o$o$o$o$b2o$3bo$3bo!

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muzik
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Re: Thread For Your Useless Discoveries

Post by muzik » July 21st, 2016, 10:26 am

Blinker fuses coming out of my ears at this point.

Code: Select all

x = 5, y = 159, rule = B3/S23
2ob2o$o3bo$b3o3$2bo$2bo$2bo7$b3o7$2bo$2bo$2bo7$b3o7$2bo$2bo$2bo7$b3o7$
2bo$2bo$2bo7$b3o7$2bo$2bo$2bo7$b3o7$2bo$2bo$2bo7$b3o7$2bo$2bo$2bo7$b3o
7$2bo$2bo$2bo7$b3o7$2bo$2bo$2bo7$b3o7$2bo$2bo$2bo7$b3o!

Thought I had found something akin to the half bakery reaction at this point:

Code: Select all

x = 11, y = 9, rule = B3/S23
4bo$3bobo$3bobo$4bo2$8b2o$bo5bo2bo$b2o5b2o$obo!
And a c/44 reaction:

Code: Select all

x = 27, y = 33, rule = B3/S23
b2o11bo$o2bo10bobo$obo11b2o$bo6$8bob2o$8b3o$9bo7$2bo$bobo$bo2bo$2b2o9$
24b2o$24bobo$24bo!

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Rhombic
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Re: Thread For Your Useless Discoveries

Post by Rhombic » July 22nd, 2016, 9:49 am

MWSS from glider+teardrop-based still life

Code: Select all

x = 13, y = 10, rule = Life
10b2o$9bo2bo$9bo2bo$obo4bob3o$b2o3bobo$bo4bo2bo$4b3o3bo$3bo5b2o$3bob2o
$4bobo!
LoM-like, from a variation on century.

Code: Select all

x = 4, y = 5, rule = Life
2bo$b3o$3bo$b2o$o!
Last edited by Rhombic on September 8th, 2016, 3:42 pm, edited 2 times in total.
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Rhombic
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Re: Thread For Your Useless Discoveries

Post by Rhombic » July 23rd, 2016, 2:40 pm

A fun reaction between a wing and an aircraft carrier, releasing a B-heptomino and a glider, catalysed by a block. Problems:
aircraft carrier is a 4-glider synthesis and it gets used up in the reaction
B-heptomino is not in a good position to use
the wing itself will need some open space for the synthesis and the evolved B-heptomino takes up the bottom part later, so it would require an incredibly good planning so as to allow every step

Code: Select all

x = 18, y = 17, rule = LifeHistory
2A6.D$2A6.2D$7.D.CA$7.A2.A$7.2A4$.2A$.A.A$3.2A2$7.D$7.2D8.D$8.2D5.3D$
7.2D6.D.D$15.D!
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what is “sesame oil”?

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Hdjensofjfnen
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Re: Thread For Your Useless Discoveries

Post by Hdjensofjfnen » July 24th, 2016, 3:33 pm

Probably already discovered:

Code: Select all

x = 39, y = 4, rule = B3/S23
2b3ob3ob3ob3ob3ob3ob3ob3ob3o3$3ob3ob3ob3ob3ob3ob3ob3ob3ob3o!

Code: Select all

x = 5, y = 9, rule = B3-jqr/S01c2-in3
3bo$4bo$o2bo$2o2$2o$o2bo$4bo$3bo!

Code: Select all

x = 7, y = 5, rule = B3/S2-i3-y4i
4b3o$6bo$o3b3o$2o$bo!

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Hdjensofjfnen
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Re: Thread For Your Useless Discoveries

Post by Hdjensofjfnen » July 24th, 2016, 6:19 pm

muzik wrote:Known reaction?

Code: Select all

RLE
And this one, too?

Code: Select all

x = 13, y = 11, rule = B3/S23
bo$2bo5bo$3o4bobo$7bobo$5b3ob3o$4bo7bo$5b3ob3o$7bobo$3o4bobo$2bo5bo$bo!

Code: Select all

x = 5, y = 9, rule = B3-jqr/S01c2-in3
3bo$4bo$o2bo$2o2$2o$o2bo$4bo$3bo!

Code: Select all

x = 7, y = 5, rule = B3/S2-i3-y4i
4b3o$6bo$o3b3o$2o$bo!

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gmc_nxtman
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Re: Thread For Your Useless Discoveries

Post by gmc_nxtman » July 25th, 2016, 12:59 pm

Weekender eater using the catalyst from AK94:

Code: Select all

x = 21, y = 23, rule = LifeHistory
14.2A3.A$15.A2.A.A$13.A4.A.A$13.5A.A$17.A$13.2A3.A$13.2A4.A$18.2A$2A$
2A3$.A12.A$.A12.A$A.A10.A.A$.A12.A$.A12.A$2.A3.4A3.A$6.4A$2.4A4.4A2$
4.A6.A$5.2A2.2A!
EDIT: Interesting pseudo-H->FNG but useless:

Code: Select all

x = 87, y = 31, rule = LifeHistory
51.A$49.3A$25.A22.A$25.3A20.2A17.A$28.A38.3A$27.2A41.A$69.2A$8.A48.2A
$8.3A47.A21.2A$11.A46.A.A18.A.A$10.2A11.2A11.C22.2A18.2A$23.2A9.3C46.
2A$34.C.C46.A.A$34.C50.A$85.2A3$9.C49.C$9.C.C47.C.C$9.3C36.2A9.3C$11.
C23.2A11.2A11.C$36.A$33.3A$33.A42.2A$76.2A$2.2A48.2A$3.A49.A$3A20.2A
25.3A$A22.A26.A$24.3A$26.A!

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Hdjensofjfnen
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Re: Thread For Your Useless Discoveries

Post by Hdjensofjfnen » July 26th, 2016, 9:10 pm

Can this partial be made into a spaceship?

Code: Select all

x = 13, y = 10, rule = B3/S23
2bo7bo$bobo5bobo$o2bo5bo2bo$b2o7b2o2$2bo7bo$bobo5bobo3$b3o5b3o!

Code: Select all

x = 5, y = 9, rule = B3-jqr/S01c2-in3
3bo$4bo$o2bo$2o2$2o$o2bo$4bo$3bo!

Code: Select all

x = 7, y = 5, rule = B3/S2-i3-y4i
4b3o$6bo$o3b3o$2o$bo!

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Hdjensofjfnen
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Re: Thread For Your Useless Discoveries

Post by Hdjensofjfnen » July 26th, 2016, 9:14 pm

Also, this one?

Code: Select all

x = 49, y = 10, rule = B3/S23
bo9bo8bo7bo8bo9bo$obo7bobo6bobo5bobo6bobo7bobo$o2bo5bo2bo5bo2bo5bo2bo
5bo2bo5bo2bo$b2o7b2o7b2o7b2o7b2o7b2o2$bo9bo8bo7bo8bo9bo$obo7bobo6bobo
5bobo6bobo7bobo3$3o7b3o6b3o5b3o6b3o7b3o!

Code: Select all

x = 5, y = 9, rule = B3-jqr/S01c2-in3
3bo$4bo$o2bo$2o2$2o$o2bo$4bo$3bo!

Code: Select all

x = 7, y = 5, rule = B3/S2-i3-y4i
4b3o$6bo$o3b3o$2o$bo!

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Re: Thread For Your Useless Discoveries

Post by Hdjensofjfnen » July 26th, 2016, 9:20 pm

Or this one!???

Code: Select all

x = 13, y = 4, rule = B3/S23
b4o3b4o$o11bo$obo2bobo2bobo$3b2o3b2o!
EDIT: Earlier predecessor:

Code: Select all

x = 9, y = 6, rule = B3/S23
3o3b3o$3o3b3o$3o3b3o$2bo3bo$2bo3bo$2bo3bo!

Code: Select all

x = 5, y = 9, rule = B3-jqr/S01c2-in3
3bo$4bo$o2bo$2o2$2o$o2bo$4bo$3bo!

Code: Select all

x = 7, y = 5, rule = B3/S2-i3-y4i
4b3o$6bo$o3b3o$2o$bo!

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Re: Thread For Your Useless Discoveries

Post by BlinkerSpawn » July 26th, 2016, 10:08 pm

For the third one you posted (two adjacent Bs) there are several spaceships that support that engine. I know at one point I made a rake using it.
The first is a predecessor to a 3c/7 wave (the second has the wrong spacing):

Code: Select all

x = 253, y = 4, rule = B3/S23
2bo7bo7bo7bo7bo7bo7bo7bo7bo7bo7bo7bo7bo7bo7bo7bo7bo7bo7bo7bo7bo7bo7bo
7bo7bo7bo7bo7bo7bo7bo7bo7bo$bobo5bobo5bobo5bobo5bobo5bobo5bobo5bobo5bo
bo5bobo5bobo5bobo5bobo5bobo5bobo5bobo5bobo5bobo5bobo5bobo5bobo5bobo5bo
bo5bobo5bobo5bobo5bobo5bobo5bobo5bobo5bobo5bobo$2ob2o3b2ob2o3b2ob2o3b
2ob2o3b2ob2o3b2ob2o3b2ob2o3b2ob2o3b2ob2o3b2ob2o3b2ob2o3b2ob2o3b2ob2o3b
2ob2o3b2ob2o3b2ob2o3b2ob2o3b2ob2o3b2ob2o3b2ob2o3b2ob2o3b2ob2o3b2ob2o3b
2ob2o3b2ob2o3b2ob2o3b2ob2o3b2ob2o3b2ob2o3b2ob2o3b2ob2o3b2ob2o$4bo3bo
11bo3bo11bo3bo11bo3bo11bo3bo11bo3bo11bo3bo11bo3bo11bo3bo11bo3bo11bo3bo
11bo3bo11bo3bo11bo3bo11bo3bo11bo3bo!
LifeWiki: Like Wikipedia but with more spaceships. [citation needed]

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Re: Thread For Your Useless Discoveries

Post by Hdjensofjfnen » July 27th, 2016, 9:26 pm

BlinkerSpawn wrote:For the third one you posted (two adjacent Bs) there are several spaceships that support that engine. I know at one point I made a rake using it.
How do you stabilize it, though?

Code: Select all

x = 5, y = 9, rule = B3-jqr/S01c2-in3
3bo$4bo$o2bo$2o2$2o$o2bo$4bo$3bo!

Code: Select all

x = 7, y = 5, rule = B3/S2-i3-y4i
4b3o$6bo$o3b3o$2o$bo!

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Re: Thread For Your Useless Discoveries

Post by Hdjensofjfnen » July 27th, 2016, 9:33 pm

Also, a semi-interesting reaction but useless:

Code: Select all

x = 38, y = 38, rule = B3/S23
15b6ob2o$15b6ob2o$22b2o$15b2o5b2o$15b2o5b2o$15b2o5b2o$15b2o$15b2ob6o$
15b2ob6o6$6ob2o5b10o$6ob2o5bo8bo5b6ob2o$7b2o5bob6obo5b6ob2o$2o5b2o5bob
o4bobo12b2o$2o5b2o5bobob2obobo5b2o5b2o$2o5b2o5bobob2obobo5b2o5b2o$2o
12bobo4bobo5b2o5b2o$2ob6o5bob6obo5b2o$2ob6o5bo8bo5b2ob6o$14b10o5b2ob6o
6$14b6ob2o$14b6ob2o$21b2o$14b2o5b2o$14b2o5b2o$14b2o5b2o$14b2o$14b2ob6o
$14b2ob6o!
EDIT: A similar reaction:

Code: Select all

x = 38, y = 38, rule = B3/S23
15b6ob2o$15b6ob2o$22b2o$15b2o5b2o$15b2o5b2o$15b2o5b2o$15b2o$15b2ob6o$
15b2ob6o6$6ob2o5b10o$6ob2o5bo8bo5b6ob2o$7b2o5bob2ob3obo5b6ob2o$2o5b2o
5bob2ob3obo12b2o$2o5b2o5bob2o5bo5b2o5b2o$2o5b2o5bo5b2obo5b2o5b2o$2o12b
ob3ob2obo5b2o5b2o$2ob6o5bob3ob2obo5b2o$2ob6o5bo8bo5b2ob6o$14b10o5b2ob
6o6$14b6ob2o$14b6ob2o$21b2o$14b2o5b2o$14b2o5b2o$14b2o5b2o$14b2o$14b2ob
6o$14b2ob6o!
EDIT 2: Another similar reaction:

Code: Select all

x = 38, y = 38, rule = B3/S23
15b6ob2o$15b6ob2o$22b2o$15b2o5b2o$15b2o5b2o$15b2o5b2o$15b2o$15b2ob6o$
15b2ob6o6$6ob2o5b10o$6ob2o5bo8bo5b6ob2o$7b2o5bo4b2o2bo5b6ob2o$2o5b2o5b
ob2ob2o2bo12b2o$2o5b2o5bob4o3bo5b2o5b2o$2o5b2o5bo3b4obo5b2o5b2o$2o12bo
2b2ob2obo5b2o5b2o$2ob6o5bo2b2o4bo5b2o$2ob6o5bo8bo5b2ob6o$14b10o5b2ob6o
6$14b6ob2o$14b6ob2o$21b2o$14b2o5b2o$14b2o5b2o$14b2o5b2o$14b2o$14b2ob6o
$14b2ob6o!

Code: Select all

x = 5, y = 9, rule = B3-jqr/S01c2-in3
3bo$4bo$o2bo$2o2$2o$o2bo$4bo$3bo!

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x = 7, y = 5, rule = B3/S2-i3-y4i
4b3o$6bo$o3b3o$2o$bo!

User avatar
BlinkerSpawn
Posts: 1992
Joined: November 8th, 2014, 8:48 pm
Location: Getting a snacker from R-Bee's

Re: Thread For Your Useless Discoveries

Post by BlinkerSpawn » July 28th, 2016, 9:47 am

Hdjensofjfnen wrote:
BlinkerSpawn wrote:For the third one you posted (two adjacent Bs) there are several spaceships that support that engine. I know at one point I made a rake using it.
How do you stabilize it, though?
With standard spaceships, akin to the space rake.
LifeWiki: Like Wikipedia but with more spaceships. [citation needed]

Image

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gmc_nxtman
Posts: 1150
Joined: May 26th, 2015, 7:20 pm

Re: Thread For Your Useless Discoveries

Post by gmc_nxtman » August 2nd, 2016, 6:46 pm

If anyone ever requires a shillelagh for a conduit:

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x = 35, y = 32, rule = LifeHistory
12.2A$13.A$13.A.A3.2A$14.2A2.A.A$19.A3$6.A$6.3A$9.A$8.2A6$5.2A$6.A$6.
A.A$2A5.2A$.A$.A.A$2.2A13.3C$6.2A9.C.C$5.A.A9.C.C$5.2A3$31.2A$31.A$
32.3A$34.A!

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Hdjensofjfnen
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Location: re^jθ

Re: Thread For Your Useless Discoveries

Post by Hdjensofjfnen » August 2nd, 2016, 10:34 pm

1333-gen methuselah:

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x = 14, y = 5, rule = B3/S23
b2o10bo$b2o10bo$13bo$b2o$2o!

Code: Select all

x = 5, y = 9, rule = B3-jqr/S01c2-in3
3bo$4bo$o2bo$2o2$2o$o2bo$4bo$3bo!

Code: Select all

x = 7, y = 5, rule = B3/S2-i3-y4i
4b3o$6bo$o3b3o$2o$bo!

drc
Posts: 1664
Joined: December 3rd, 2015, 4:11 pm

Re: Thread For Your Useless Discoveries

Post by drc » August 2nd, 2016, 11:08 pm

Two cells off:

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x = 7, y = 9, rule = B3/S23
3b2o$4bo$3bo$3o2$3b2o$3bo$4b3o$6bo!

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Hdjensofjfnen
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Location: re^jθ

Re: Thread For Your Useless Discoveries

Post by Hdjensofjfnen » August 3rd, 2016, 9:18 pm

drc wrote:Two cells off:

Code: Select all

RLE
Two cells off of what?

Code: Select all

x = 5, y = 9, rule = B3-jqr/S01c2-in3
3bo$4bo$o2bo$2o2$2o$o2bo$4bo$3bo!

Code: Select all

x = 7, y = 5, rule = B3/S2-i3-y4i
4b3o$6bo$o3b3o$2o$bo!

mniemiec
Posts: 1590
Joined: June 1st, 2013, 12:00 am

Re: Thread For Your Useless Discoveries

Post by mniemiec » August 3rd, 2016, 10:41 pm

drc wrote:Two cells off: ...
Hdjensofjfnen wrote:Two cells off of what?
If you run this for 3 generations, you get the initial configuration again, except one required live cell is dead, and one required dead cell is alive - so this is two cells off from being a period 3 oscillator.

If you add one extra live cell to turn the top 4-cell piece into a boat, the top piece reforms flipped in 2 generations. Adding another eater makes a period 4 oscillator - Confused Eaters. The boat can be replaced by many similar things. The smallest form replaces it with an L-tromino.

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