Eater 3

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Eater 3
x = 12, y = 12, rule = B3/S23 9b2o$4b2o2bo2bo$bo2bo4bobo$obobo5bo$bo2bob2o$4bo2bo$5bo4bo$6b5o2$8bo$ 7bobo$8bo! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C Still life
Pattern type Constellation
Number of cells 31
Bounding box 12×12
Discovered by David Buckingham
Year of discovery 1977

Eater 3 is a large symmetric eater that was found by David Buckingham on June 22, 1977[1] and has a very different eating action from eater 1 and eater 2; however, it shares with those two eaters the ability to eat gliders. The loaf can take bites out things, being flipped over in the process. The rest of the object simply flips it back again. Two copies of the eater 3 can share a loaf, forming the period 8 oscillator shown below.

The eater 3 can be reduced in area by using snakes rather than tubs in the casing; this property is used to compact the rectifier.

On July 2, 2016, Mark Niemiec found an 18-glider synthesis based on a reaction found by Bullet51,[2] for an eater 3 variant using buns as stabilizers. Before this the cheapest known construction recipe for any eater 3 variant needed 72 gliders. In April 2020 GUYTU6J reduced this to 16 gliders.[3]

Image gallery

A related period 8 oscillator
Download RLE: click here

See also


  1. Dean Hickerson's oscillator stamp collection. Retrieved on March 14, 2020.
  2. Mark Niemiec (July 2, 2016). Re: Thread for your unsure discoveries (discussion thread) at the forums
  3. GUYTU6J (April 12, 2020). Re: Synthesising Oscillators (discussion thread) at the forums

External links