Eater 1 reaction

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The Eater 1 reaction is a reaction that eats various patterns with a 2-cell or 3-cell leading edge (or occasionally more), most notably gliders.

x = 29, y = 8, rule = B3/S23 2bo8b2o7bobo$obo8b2o9bo$b2o8b2o7b3o$4b2o8b2o8b2o$4bobo7bobo7bobo$6bo9b o9bo$6b2o8bob2o6bobo$15b2ob2o7b2o! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ GPS 4 WIDTH 600 HEIGHT 500 ]]
Three eater 1 catalyses using different still lifes, which are all equivalent. They all feature a pre-block head which catalyses the active regions.
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In most cases, an eater 2 performs the same function as an eater 1, but there are a decent number of catalyses that only work with an eater 2, and a few that only work with an eater 1, such as eating a blinker:

x = 23, y = 10, rule = B3/S23 o13bo$o13bo$o13bo$2b2o12b2obo$2bobo11b2ob3o$4bo17bo$4b2o10b2ob3o$17bob o$17bobo$18bo! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ GPS 4 WIDTH 600 HEIGHT 500 ]]
Eating a blinker works with an eater 1 but not an eater 2.
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For an eater 1 to work, it is essential that the cells marked in yellow and red below are off.

x = 26, y = 12, rule = LifeHistory 2.2A16.2A$A2.A13.A3.A$3A14.4A2$3A14.4A$E2.A13.AD2.A$2.2A16.2A3$5.3A 15.3A$5.A17.A$6.A17.A! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ GPS 4 WIDTH 600 HEIGHT 500 ]]
The yellow cell is on, so it fails. The red cell is off, so it succeeds.
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Unusual uses of eater 1

x = 30, y = 30, rule = B3/S23 12b2o9b2o$11bo2bo7bo2bo$11b3o9b3o$14b9o$b2o10bo2b5o2bo$obo10b2o2b3o2b 2o$obob2o$bobobo$3bo$3b2o5b3o$3b3o3bo3bo$3b3o2bo5bo12b2o$3b3o2bo5bo12b obo$3b2o3bo5bo9b2obobo$3bo5bo3bo3b3o4bobobo$bobobo4b3o3bo3bo5bo$obob2o 9bo5bo3b2o$obo12bo5bo2b3o$b2o12bo5bo2b3o$16bo3bo3b3o$17b3o5b2o$26bo$ 24bobobo$24b2obobo$6b2o2b3o2b2o10bobo$6bo2b5o2bo10b2o$7b9o$4b3o9b3o$4b o2bo7bo2bo$5b2o9b2o! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ GPS 8 WIDTH 500 HEIGHT 400 ]]
The middleweight emulators act as eater 1s in this p32 honey farm hassler.
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RLE: here Plaintext: here
x = 47, y = 18, rule = B3/S23 4b2o6b2o$3bobo6bobo$3bo10bo$2obo10bob2o$2obo2bob2obo2bob2o20b2o$3bobob o2bobobo21b6o$3bobobo2bobobo20b8o$2obo2bob2obo2bob2o$2obo10bob2o26b2o$ 3bo10bo29bo$3bobo6bobo27bobo$4b2o6b2o28b2o2$8b3o27b3o$10b5o25b5o$8bo3b o2bo22bo3bo2bo$6b3o7bo19b3o7bo$5bo29bo! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ GPS 4 WIDTH 500 HEIGHT 400 ]]
As shown in the 101 page, it has a contrived catalysis. Replacing the oscillator with a fishhook and placing a domino in generation 3 reveals that it functions identically.
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Frequency

According to Catagolue, as of May 2, 2024, the vast majority of 22P36 eater 1s, about 87%, are fishhooks. There are about 1/10 as many integrals as fishhooks, and 1/100 as many block on docks (in both cis- and trans- form relative to the pentadecathlon), moose antlers, and fourteeners, with others being even rarer.

The ratio is slightly different for asymmetric pentadecathlon oscillators. The fishhook:integral ratio is only 4.6:1. Next is pentadecathlon on cis-boat up on dock, but that is not "natural" frequency as it forms from a forming pentadecathlon hitting a beehive and block rather than the cis-boat up on dock having to form by itself. Other eater 1s have a small sample size, but elevener and block on dock (trans relative to the pentadecathlon) both imply a 70:1 ratio to the fishhook, more common than the 22P36 data.


See also