Eater/block frob

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Eater/block frob
x = 10, y = 10, rule = B3/S23 b2o$2bo$2bobo$3bobo$5b2ob2o$8b2o$2b2o$3bo$3o$o! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ AUTOSTART ]] #C [[ LOOP 4 GPS 2 THUMBSIZE 2 ]]
Pattern type Oscillator
Number of cells 20
Bounding box 10 × 10
Period 4
Mod 4
Heat 8.5
Volatility 0.55
Strict volatility 0.55
Discovered by David Buckingham
Year of discovery Unknown

Eater/block frob is a period-4 oscillator found by David Buckingham in 1976 or earlier.[1] Composed of an eater 1, a block, and what is roughly a melusine, it is essentially a tub-with-tail eater constantly being hassled. "Frob" is used by MIT as a generic term meaning "thing".[2]

The block can be replaced with a long hook with tail, and the eater 1 can be replaced with an eater bridge eater or an emulator.

Its grin makes it useful in the p4 bumper.

This oscillator first appeared naturally on April 3, 2022, in a soup found by Charity Engine using apgsearch.[3]

Carson Cheng found an 11-glider synthesis of this oscillator on June 30, 2022,[4] which was reduced to 10 gliders by Tanner Jacobi later the same day.[5]

See also


  1. Dean Hickerson's oscillator stamp collection. Retrieved on March 14, 2020.
  2. Mark Niemiec (November 27, 2016). Re: Help with names (discussion thread) at the forums
  3. Ian07 (April 3, 2022). Re: Soup search results (discussion thread) at the forums
  4. Carson Cheng (June 28, 2022). Re: Synthesising Oscillators (discussion thread) at the forums
  5. Tanner Jacobi (June 30, 2022). Message in #cgol on the Conwaylife Lounge Discord server

External links

  • 20P4.4 at Heinrich Koenig's Game of Life Object Catalogs