B29

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.

B29
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Pattern type Tagalong
Spaceship
Number of cells 29
Bounding box 10×17
Direction Diagonal
Period 4
Mod 4
Speed c/4
Speed (unsimplified) c/4
Heat 30
Discovered by Hartmut Holzwart
Year of discovery 2004

Due to a synthesis completed by Tanner Jacobi in April 2015,[2] B29 is one of relatively few elementary diagonal spaceships with a known glider synthesis.

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.

Three ways in which gliders can non-trivially follow a B29
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See also

References
  1. "B29". The Life Lexicon. Stephen Silver.
  2. Tanner Jacobi (April 5, 2015). Re: Small Spaceship Syntheses (discussion thread) at the ConwayLife.com forums
  • 29P4H1V1.1 at Heinrich Koenig's Game of Life Object Catalogs
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