B3/S234

[pzq_alex]

I've been looking at c/2 spaceships in this rule recently. First of all, there are no period 2 spaceships with a width less than or equal to 18.

Glide symmetric searches seem to be more fruitful. For example here is a thinner mod 2 c/2 glide-symmetric spaceship than any p2 c/2 spaceship, from rlifesrc:

Code: Select all

x = 17, y = 95, rule = B3/S234
3b2o7b2o$2b4o5b4o$2bo2bo5bo2bo$bo2b3o3b3o2bo$bo2bob2ob2obo2bo$4bobo3b
obo$2bobobobobobobo$b2obobo3bobob2o$b3o2bo2b2o2b3o$5ob2o2bob5o$6bob3o
$2b3obobobob3o$6bobobo$4bobobobobo$3b2obobobob2o$3b3o2bo2b3o$2b5obob5o
$8bo$2b3o3bo3b3o$7b3o$7bobo$2b2o9b2o$2b2o9b2o$b2o9b2o$2b5o3b2o$2b2o2b
3ob3o$3b2o3b3o2bo$3b2o3bob4o$2b2o7b2o$2bo2bobo4b3o$b2obo7bobo$2bob5o3b
ob2o$b2ob2ob3o2bobo$2bobo2bo2bobob2o$b2obobo2bo2bobo$2bobobobobobob2o
$b2obobobobobobo$2bobobo3bobob2o$b2obo2bobo2bobo$2bobo7bob2o$b2obo6b2o
bo$2bobo2bo2b3ob2o$b2obobob3obobo$2bobobobobobob2o$b2obobo3bobobo$2bo
bobobobobob2o$b2obo7bobo$2bob2o6bob2o$b2obo6b2obo$2bobob2ob2obob2o$b2o
bob2ob2obobo$2bobobobobobob2o$b2obobo3bobobo$2bobobo3bobob2o$b2obobo2b
2obobo$2bobob2o2bobob2o$b2obobobobobobo$2bobobobobobob2o$b2obobo3bobo
bo$2bobobo3bobob2o$b2obo2bobo2bobo$2bo4bobo4b2o$b2ob2obobob2obo$2bo4b
obo4b2o$b2ob2obobo2bo$bo3bobobob3obo$3bobobobobobobo$bobobobobobo2bo$
bobobobobobo2bo$bobobobobobobo$3bobobobobobobo$5bobobobo$4b2obobobo$5b
obobob2o$2b2obobobobob2o$2bo2bobobobo2bo$7bobo$b2ob2obobob2ob2o$7bobo
$4bo2bobo2bo$5bobobobo$4b2obobob2o$4bo2bobo2bo2$3b2ob2ob2ob2o2$6bo3bo
$6bo3bo2$4b2o5b2o$4b2o5b2o$4b3o3b3o$3b2ob2ob2ob2o$6b2ob2o$6b2ob2o!

It is actually a spaceship at the front plus a tagalong. There are some reusable components in the tagalong but I don’t know how to separate them.