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3b2o3b$2b2o4b$4bo3b$6b2o$5bo2b2$4bo2bo$b2obo3b$2o4bob$2bobo2bo$7bo$4bo 2bo$5bobo$5bobo$6b2o$6bo! #C [[ THEME 6 GRID GRIDMAJOR 0 THUMBLAUNCH AUTOSTART ]] #C [[ TRACKLOOP 4 -1/4 -1/4 THUMBSIZE 2 GPS 4 ]]
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.

B29 is one of the few 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.

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