(13,1)c/31 Pseudo-B climber is a crawler that consists of B-heptominoes climbing up gliders or still lifes, but not managing to become Herschels in the process. This reaction is first known to have been discovered by David Bell on April 12, 2003.
The idea of a (13,1)c/31 spaceship was proposed in Bell's original LifeCA post, and was later mentioned by Gabriel Nivasch upon completion of the original caterpillar, before any oblique spaceships were found or constructed in Life.[1] Some initial work on helix variants and other crawler-supporting mechanisms was done in 2016.[2] Despite being the first proposed climber for use in a spaceship, (23,5)c/79 and (34,7)c/156 were constructed first despite their core reactions being discovered much later.
