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c/2 challenge
Posted: March 21st, 2022, 7:57 am
by hotdogPi
What is the longest non-infinite elementary c/2 forward mechanism you can find?
As a starter, this becomes a B-heptaplet in generation 23, and the first generation where it falls behind is generation 38. (If it falls behind and makes it up superstring-style, that doesn't end the run.)
Code: Select all
x = 5, y = 4, rule = B3/S23
o2bo$o3bo$o3bo$b4o!
(Now that I think about it, it should probably have been in sandbox.)
Re: c/2 challenge
Posted: March 21st, 2022, 12:28 pm
by Wyirm
Are extensible c/2o partials allowed? They eventually stop moving, are finite in size, and can last arbitrarily long times.
Re: c/2 challenge
Posted: March 21st, 2022, 12:42 pm
by GUYTU6J
Agree with the proposed move. Random quotes:
11-40
MathAndCode wrote: September 21st, 2020, 5:43 pm
A honey farm predecessor reacting with a block edgeshoots a block a long way off.
Code: Select all
x = 7, y = 7, rule = B3/S23
2o$2o4bo$5bo$6bo2$4b2o$5bo!
27-62
Entity Valkyrie 2 wrote: October 6th, 2020, 10:08 pm
A non-trivial example, but it contains an aircraft carrier:
Code: Select all
x = 27, y = 17, rule = B3/S23
16b2o$16b2o4$13bo$14b2o$13b2o4$25b2o$o22bo2bo$3o20b2o$2bo$2bo!
Re: c/2 challenge
Posted: March 21st, 2022, 12:47 pm
by Kazyan
This three glider collision is a contender:
Code: Select all
x = 8, y = 9, rule = B3/S23
bo$2bo2bobo$3o3b2o$6bo3$2b3o$4bo$3bo!
It's used in the current synthesis of
xs17_jhke0mqz1, in which we needed a long-lived c/2 mechanism to make it work.
Re: c/2 challenge
Posted: March 21st, 2022, 8:18 pm
by yujh
First generation to fall behind is 46
Code: Select all
x = 6, y = 4, rule = B3/S23
4bo$2o3bo$bo3bo$2b4o!
Re: c/2 challenge
Posted: March 21st, 2022, 9:32 pm
by toroidalet
Perhaps this is not in the spirit of the contest, but all 4 B-heptominoes simultaneously fail the advance in generation 288:
Code: Select all
x = 35, y = 5, rule = B3/S23
3o29b3o$o2bo27bo2bo$o6b3o3b3o3b3o3b3o6bo$o5bo2bo3bo2bobo2bo3bo2bo5bo$b
obo6bobo9bobo6bobo!
EDIT: even more dubiously, 398:
Code: Select all
x = 37, y = 11, rule = B3/S23
b3o29b3o$o2bo29bo2bo$3bo4b3o3b3o3b3o3b3o4bo$3bo4bo2bobo2bo3bo2bobo2bo
4bo$obo5bo7bo3bo7bo5bobo3$12bo11bo$12bo11bo$12bo11bo!
Re: c/2 challenge
Posted: March 21st, 2022, 10:18 pm
by yujh
It’s probably the whole thing that stop, not part of it I believe