Backrake 2

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Backrake 2
x = 19, y = 26, rule = B3/S23 3bo$2b3o$b2obo5bo$b3o5b3o$2b2o4bo2b2o3b3o$8b3o4bo2bo$18bo$18bo$18bo$2b 3o12bo$2bo2bo$2bo$2bo$3bo7$3o$o2bo11bo$o13b3o$o12b2obo$o12b3o$bo12b2o! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ AUTOSTART ]] #C [[ ZOOM 10 AUTOSTART OFF ]]
Pattern type Rake
Puffer
Number of cells 65
Bounding box 19×26
Direction Orthogonal
Period 12
Speed c/2
Discovered by David Buckingham
Year of discovery Unknown

Backrake 2 is a period-12 backrake that was created by David Buckingham. It works by having a front puffer made up of two lightweight spaceships, a middleweight spaceship, and a B-heptomino (much like puffer 2) send debris back to another lightweight and middleweight spaceship, which turn the debris into a backward-moving glider.

Three copies of this backrake feature in total aperiodic.

Reduction

On April 28, 2022, wwei23 discovered a 39-cell period-12 backrake that works as a reduced version of Backrake 2 using the apgsearch custom symmetry WSS_test, that had also found 35P12H6V0.[1]

x = 20, y = 6, rule = B3/S23 9bo7bo$b3o4b3o5b3o$o2bo3bo2b2o4bob2o$3bo3bo3bo5b3o$3bo4b2o2bo4b2o$obo 8bo! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ ZOOM 20 Y 6 HEIGHT 480 TRACKLOOP 12288 0 -1/2 THUMBSIZE 2 GPS 4 AUTOSTART ]]
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RLE: here Plaintext: here

References

  1. wwei23 (April 28, 2022). Re: Spaceship Discussion Thread (discussion thread) at the ConwayLife.com forums

See also