## On eaters as protecting groups

For discussion of specific patterns or specific families of patterns, both newly-discovered and well-known.

### On eaters as protecting groups

As a chemist, I find eaters to be very interesting, since they can be attached to otherwise unstable sections of a pattern to stabilise it (and thus create still lifes just by capping every single unstable point with an eater).
This is similar to the concept of protecting groups in chemistry, that can be removed easily later on.

Eaters coordinate very effectively, and in a very useful way, to dominoes:
`x = 10, y = 5, rule = B3/S232b2o\$bobo4b2o\$bo2b2o2bo\$2o4bobo\$6b2o!`

Now, while that example seems a bit pointless, I think that for more useful structures where you want a domino to appear at some point (namely, when a glider takes the eater off), it is not so far-fetched to conceive it as a potential way to temporarily cap still life structures.

I am going to try to find a way to remove the eater on the following pattern with a glider, without causing immediate interference to the adjacent pattern (except that that would result of manually taking away the eater):
`x = 24, y = 24, rule = B3/S232b2o\$bobo\$bo2b2o\$2o4bo\$6bo\$7b2o\$9bo\$9bo\$10b2o\$12bo\$12bo\$13b2o\$15bo\$15bo\$16b2o\$18bo\$18bo\$19b2o\$21bo\$21bo\$22b2o\$23bo\$20b3o\$20bo!`

Any ideas or comments are welcome.
SoL : FreeElectronics : DeadlyEnemies : 6a-ite
what is “sesame oil”?

Rhombic

Posts: 1032
Joined: June 1st, 2013, 5:41 pm

### Re: On eaters as protecting groups

Update: getting close
`x = 12, y = 12, rule = B3/S23bo\$2bo6bo\$3o6bobo\$9b2o2\$6bo\$4b3o\$3bo\$3b2o\$10bo\$9b2o\$9bobo!`
SoL : FreeElectronics : DeadlyEnemies : 6a-ite
what is “sesame oil”?

Rhombic

Posts: 1032
Joined: June 1st, 2013, 5:41 pm

### Re: On eaters as protecting groups

...except that NW-traveling glider in the second post is 2hd too far left and would interfere with the domino chain and the other eater.
LifeWiki: Like Wikipedia but with more spaceships. [citation needed]

Posts: 1819
Joined: November 8th, 2014, 8:48 pm
Location: Getting a snacker from R-Bee's

### Re: On eaters as protecting groups

Rhombic wrote:I am going to try to find a way to remove the eater on the following pattern with a glider, without causing immediate interference to the adjacent pattern.

I think this does the job after 8 generations:

`x = 29, y = 27, rule = B3/S232b2o\$bobo\$bo2b2o\$2o4bo\$6bo\$7b2o\$9bo\$9bo\$10b2o\$12bo\$12bo\$13b2o\$15bo\$15bo\$16b2o\$18bo\$18bo9bo\$19b2o5b2o\$21bo5b2o\$21bo\$22b2o\$23bo\$20b3o\$20bo\$25b3o\$25bo\$26bo!`
chris_c

Posts: 870
Joined: June 28th, 2014, 7:15 am

### Re: On eaters as protecting groups

chris_c wrote:
Rhombic wrote:I am going to try to find a way to remove the eater on the following pattern with a glider, without causing immediate interference to the adjacent pattern.

I think this does the job after 8 generations:

`x = 29, y = 27, rule = B3/S232b2o\$bobo\$bo2b2o\$2o4bo\$6bo\$7b2o\$9bo\$9bo\$10b2o\$12bo\$12bo\$13b2o\$15bo\$15bo\$16b2o\$18bo\$18bo9bo\$19b2o5b2o\$21bo5b2o\$21bo\$22b2o\$23bo\$20b3o\$20bo\$25b3o\$25bo\$26bo!`

Beautiful! Let's see where this goes then.
SoL : FreeElectronics : DeadlyEnemies : 6a-ite
what is “sesame oil”?

Rhombic

Posts: 1032
Joined: June 1st, 2013, 5:41 pm

### Re: On eaters as protecting groups

Rhombic wrote:Eaters coordinate very effectively, and in a very useful way, to dominoes: ...

Snakes and carriers can perform the same function, and are usually easier to construct.
`x = 10, y = 5, rule = B3/S23ob2o\$2obo\$4b2o2b2o\$6bo2bo\$6b2o!`
mniemiec

Posts: 969
Joined: June 1st, 2013, 12:00 am

### Re: On eaters as protecting groups

mniemiec wrote:Snakes and carriers can perform the same function, and are usually easier to construct.
`x = 10, y = 5, rule = B3/S23ob2o\$2obo\$4b2o2b2o\$6bo2bo\$6b2o!`

That is true. However, removing them without interfering with the adjacent pattern is a bit more unlikely (as far as I have seen). I'll have a look now.
SoL : FreeElectronics : DeadlyEnemies : 6a-ite
what is “sesame oil”?

Rhombic

Posts: 1032
Joined: June 1st, 2013, 5:41 pm

### Re: On eaters as protecting groups

A still life: di-carrier-capped 3(1)2 hexomino protected by a beehive. A glider collides with the beehive, destroying it without directly attacking the other section of the still life. It then collapses after the beehive disappears.

`x = 13, y = 12, rule = B3/S233bo\$4bo\$2b3o2\$6bo\$5bobo\$5bobo\$6bo2\$2o2b5o2b2o\$o2bo2bo2bo2bo\$2b2o5b2o!`
SoL : FreeElectronics : DeadlyEnemies : 6a-ite
what is “sesame oil”?

Rhombic

Posts: 1032
Joined: June 1st, 2013, 5:41 pm

### Re: On eaters as protecting groups

Rhombic wrote:A still life: di-carrier-capped 3(1)2 hexomino protected by a beehive. A glider collides with the beehive, destroying it without directly attacking the other section of the still life. It then collapses after the beehive disappears. ...

Such caps are easy to remove. Here are some other examples:
`x = 147, y = 50, rule = B3/S233bobbo16bobbo16bobbo16bobbo16bobbo16bobbo16bobbo16bobbo\$3b4o16b4o16b4o16b4o16b4o16b4o16b4o16b4o\$\$3boo18boo18boo18boo18boo18boo18boo18boo\$3boo18bobo16bobbo17bobo17bo19bo19bobbo16bo\$24bo18boo19boo18bo20bo19boo19bo\$boo23b3o32boo4boo14boo15b3oboo16boo21boo\$obo23bo33bobo4bobo10bo5boo14bo18bobo\$bbo24bo16boo16bo4bo12boo4bobo12bo21bo20bo\$44bobo32bobo4bo56boo\$44bo98bobo\$41boo\$40bobo\$42bo7\$3boo3boo13boo3boo13boo3boo13boo3boo13boo3boo13boo3boo13boo3boo\$3bobbobbo13bobbobbo13bobbobbo13bobbobbo13bobbobbo13bobbobbo13bobbobbo\$4b5o15b5o15b5o15b5o15b5o15b5o15b5o\$\$6bo19bo19bo19bo19bo19bo19bo\$5bobo17bobo17bobo17bobo16b3o18bobo17bobo\$6bo18boo19bobo16bobo15bo20bobbo16bobbo\$28b3o16bo18bo16boobb3o15boo17bobo\$4booboo19bo39boo17bo13b3o21bo\$3bobobobo19bo18boo18bobo17bo14bo17b3o\$5bobo40bobo17bo11boo20bo20bo\$48bo32boo39bo\$80bo8\$3boo18boo\$3bobbo16bobbo\$4b3o17b3o\$\$4boobo16boobo\$4boboo15bobboo\$23boo\$3boo3b3o9boo6b3o\$bbobo3bo10bobo6bo\$4bo4bo11bo7bo!`
mniemiec

Posts: 969
Joined: June 1st, 2013, 12:00 am