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Pattern type Tagalong
Number of cells 29
Bounding box 10×17
Direction Diagonal
Period 4
Mod 4
Speed c/4
Heat 30
Discovered by Hartmut Holzwart
Year of discovery 2004

B29 is a c/4 diagonal spaceship discovered by Hartmut Holzwart in September 2004.[1] In generation 2 it produces an isolated domino spark that can be used to perturb reactions. In terms of its 29 cells, it is the fourth smallest c/4 diagonal spaceship, as well as the smallest c/4 spaceship to not exhibit glide symmetry. There are three ways in which a glider can non-trivially follow a B29, as shown below.

Due to a synthesis completed by Tanner Jacobi in April 2015, B29 is one of relatively few elementary diagonal spaceships with a known glider synthesis -- not counting the Corderships, which include several infinite families of constructible arrangements of switch engines.

Two gliders can be seen at the front of the ship, one of these being temporary and the other permanent, making this a tagalong. The other glider does not stay as a glider but still moves like one.

Image gallery

Three ways in which gliders can non-trivially follow a B29
Download RLE: click here

See also


  1. "B29". The Life Lexicon. Stephen Silver.

External links