x = 21, y = 20, rule = B36/S23
12boo$13boo$10boboo$10b3o$11bo8bo$20bo$20bo$$3bo$bboo$bobo$3o6$5bo$5bo
$5bo!
This is a period 48 backwards rake.
It is composed of two bombers whose bombs react to form gliders.
Dean Hickerson, 1994