Riley's breeder

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Riley's breeder
x = 135, y = 41, rule = B3/S23 133bo$134bo$130bo3bo$131b4o3$130bo$131bo$132bo$132bo$131b2o4$133bo$ 134bo$130bo3bo$131b4o9$96bo$97bo$93bo3bo$94b4o8$3bo$4bo$o3bo$b4o! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]]
Pattern type Breeder
Number of cells 38
Bounding box 135×41
Direction Orthogonal
Period 140
Speed c/2
Discovered by Mitchell Riley
Year of discovery 2006

Riley's breeder is a suprisingly small 38-cell quadratic growth pattern, discovered by Mitchell Riley in July 2006. It comprises a puffer train and two LWSSes. It produces a switch engine every 140 generations, filling three eighths of the Life plane. It has fewer cells than metacatacryst, and fits in a bounding box several orders of magnitude smaller.

It was originally discovered as a 40-cell pattern, but can be backtracked two generations by replacing the B-heptomino with a hexaplet.