Catalyst Discussion Thread

[Anivec]

These two catalysts seem to be equivalent :

• xs30_0g88ehjzg5t1vg23z11/b3s23
• xs29_0g89fgkczg5t178cz11/b3s23 or smaller variant of eater 3

But the first is more versatile.
Notice that the first can eat a G1 stream like Eater 3.

Code: Select all

x = 165, y = 63, rule = LifeHistory
2.A9.A$3.A8.A.A$.3A8.2A$9.2C28.2C28.2C28.2C28.2C28.2C$4.2C2.C.C23.2C
2.C.C23.2C2.C.C23.2C2.C.C23.2C2.C.C23.2C2.C.C$4.C3.C4.C20.C3.C4.C20.C
3.C4.C20.C3.C4.C20.C3.C4.C20.C3.C4.C$5.3C.5C21.3C.5C21.3C.5C21.3C.5C
21.3C.5C21.3C.5C$7.C.C27.C.C27.C.C27.C.C27.C.C27.C.C$7.C.C.3C23.C.C.
3C23.C.C.3C23.C.C.3C23.C.C.3C23.C.C.3C$8.2C.C2.C23.2C.C2.C23.2C.C2.C
23.2C.C2.C23.2C.C2.C23.2C.C2.C$4.3A6.2C20.2A6.2C19.3A6.2C20.2A6.2C19.
3A6.2C19.3A6.2C$6.A29.A29.A28.2A27.3A29.A$5.A30.A58.2A57.A.A3$3A$2.A$
.A33$2.A$3.A$.3A$9.2C28.2C28.2C28.2C28.2C28.2C$4.2C2.C.C23.2C2.C.C23.
2C2.C.C23.2C2.C.C23.2C2.C.C23.2C2.C.C$4.C3.C25.C3.C25.C3.C25.C3.C25.C
3.C25.C3.C$5.3C.4C22.3C.4C22.3C.4C22.3C.4C22.3C.4C22.3C.4C$7.C.C2.C
24.C.C2.C24.C.C2.C24.C.C2.C24.C.C2.C24.C.C2.C$3.3C.C.C23.3C.C.C23.3C.
C.C23.3C.C.C23.3C.C.C23.3C.C.C$2.C2.C.2C23.C2.C.2C23.C2.C.2C23.C2.C.
2C23.C2.C.2C23.C2.C.2C$2.2C6.2A20.2C6.2A20.2C6.3A19.2C6.2A20.2C6.3A
19.2C6.3A$10.A.A27.A29.A29.2A28.3A27.A$10.A29.A59.2A58.A.A!

The first one is more like eater 3 due to the fact that its clearance, eating capability and its eating mechanism are more similar to eater 3 than the second.

[Tawal]

[…]
The first one is more like eater 3 due to the fact that its clearance, eating capability and its eating mechanism are more similar to eater 3 than the second.

Yes, I think so.
Perhaps it would be good to replace smaller variant of Eater 3 by xs30_0g88ehjzg5t1vg23z11 on LifeWiki

[confocaloid]

These two catalysts seem to be equivalent :

• xs30_0g88ehjzg5t1vg23z11/b3s23
• xs29_0g89fgkczg5t178cz11/b3s23 or smaller variant of eater 3

But the first is more versatile. [...]

The first one is also cheaper (14 gliders) than the second (23 gliders), comparison in Rule:DoubleB3S23:

Code: Select all

x = 597, y = 102, rule = DoubleB3S23
417.B$415.B.B$416.2B4$435.B.B$435.2B$436.B3$494.B5.2B88.B$435.3B55.B.
B3.B.B86.B.B$435.B56.B2.B2.B.B88.2B3.B.B$436.B56.2B4.B94.2B$595.B2$
551.B37.B$498.2B3.B.B43.3B35.3B$497.2B4.2B43.B3.2B32.B3.2B$499.B4.B
43.4B2.B31.4B2.B$551.B.2B34.B.2B$548.2B.B34.2B.B$549.B.B35.B.B$508.2B
37.B.B.2B32.B.B.2B$445.2B60.2B38.2B36.2B$444.2B63.B$446.B$515.B37.2B$
514.B38.2B$514.3B$492.B56.3B$492.2B57.B$491.B.B18.2B36.B$512.B.B$512.
B$477.2B$478.2B$477.B5$4.2B.2A25.2B.2A25.2B.2A25.2B.2A25.2B.2A25.2B.
2A$2.2AB.C.A2B21.2AB.C.A2B21.2AB.C.A2B21.2AB.C.A2B21.2AB.C.A2B21.2AB.
C.A2B$.BA3.C3.B20.BA3.C3.B20.BA3.C3.B20.BA3.C3.B20.BA3.C3.B20.BA3.C3.
B$.2B3C.3CA20.2B3C.3CA20.2B3C.3CA20.2B3C.3CA20.2B3C.3CA20.2B3C.3CA$5.
C.C2.A24.C.C2.A24.C.C2.A24.C.C2.A24.C.C2.A24.C.C2.A$.3C.C.C23.3C.C.C
23.3C.C.C23.3C.C.C23.3C.C.C23.3C.C.C$C2.C.2C23.C2.C.2C23.C2.C.2C23.C
2.C.2C23.C2.C.2C23.C2.C.2C$2C6.3C19.2C6.3C19.2C6.2C20.2C6.3C19.2C6.2C
20.2C$8.C29.3C27.2C28.C29.C$8.C.C57.2C58.C30.3C$159.C$160.C3$165.3C$
165.C$166.C12$268.A$269.A$267.3A3$271.2A$271.A.A9.A$271.A10.A$282.3A
3$320.2A45.2A41.2A40.2A36.2A49.2A49.2A$321.A8.A37.A42.A41.A37.A50.A
50.A$269.A51.A.2A4.A33.A4.A.2A39.A.2A38.A.2A34.A.2A47.A.2A47.A.2A$
269.2A49.2A2.A4.3A32.A2.2A2.A37.3A2.A36.3A2.A32.3A2.A45.3A2.A45.3A2.A
$268.A.A10.3A38.2A38.3A4.2A37.A3.2A36.A3.2A32.A3.2A45.A3.2A5.A.A37.A
3.2A$281.A38.2A45.2A39.4A38.4A34.4A47.4A7.2A38.4A$282.A36.A.A44.A.A
42.A41.A37.A50.A8.A41.A$320.A45.A.A.2A36.2A.A.2A35.2A.A.2A31.2A.A.2A
44.2A.A.2A44.2A.A.A$367.2A.2A36.A2.A.2A34.A.A.A2.A30.A.A.A2.A43.A.A.A
2.A38.2A3.A.A2.2A$402.A6.2A39.A3.2A31.2A3.2A44.2A3.2A38.A.A2.A2.A$
326.3A74.2A42.A85.A.A49.A3.2A$315.2A9.A75.2A41.A.A86.2A10.2A$316.2A9.
A118.2A47.A38.A10.A2.A$315.A135.2A42.2A3.2A43.A2.A$319.2A83.2A5.2A37.
2A42.A.A3.A.A43.2A39.3A$319.A.A81.A.A5.A.A38.A47.A36.3A49.A$319.A85.A
5.A127.A48.A$538.A5.2A$545.2A$544.A!

[get_Snacked]

is this R-pentomino catalyst known?

Code: Select all

x = 9, y = 10, rule = B3/S23
6bo$4b3o$3bo$3bo2b3o$2b2obo2bo$o2bob2o$2obo$3bo4bo$3b2o2b2o$6bobo!

EDIT (2024-01-30):

Simplified catalyst:

Code: Select all

x = 9, y = 8, rule = B3/S23
6b2o$5bobo$5bo$ob2ob2o$2obo$3bo4bo$3b2o2b2o$6bobo!

EDIT:
Never mind, this catalyst gives a different output.

completely expected a random component from this:

Code: Select all

x = 9, y = 10, rule = B3/S23
6b2o$5bobo$5bo$ob2ob2o$2obo$3bo4bo$3b2o2b2o$6bobo2$8bo!

hmmm...

Code: Select all

x = 9, y = 12, rule = B3/S23
6bo$4b3o$3bo$3bo2b3o$2b2obo2bo$o2bob2o$2obo$3bo4bo$3b2o2b2o$6bobo2$8b
o!
[[ STOP 9 ]]

[Anivec]

is this R-pentomino catalyst known?

Code: Select all

x = 9, y = 10, rule = B3/S23
6bo$4b3o$3bo$3bo2b3o$2b2obo2bo$o2bob2o$2obo$3bo4bo$3b2o2b2o$6bobo!

Simplified catalyst:

Code: Select all

x = 9, y = 8, rule = B3/S23
6b2o$5bobo$5bo$ob2ob2o$2obo$3bo4bo$3b2o2b2o$6bobo!

EDIT:
Never mind, this catalyst gives a different output.

[MathAndCode]

These two catalysts seem to be equivalent :

• xs30_0g88ehjzg5t1vg23z11/b3s23
• xs29_0g89fgkczg5t178cz11/b3s23 or smaller variant of eater 3

But the first is more versatile.
Notice that the first can eat a G1 stream like Eater 3.

Code: Select all

x = 165, y = 63, rule = LifeHistory
2.A9.A$3.A8.A.A$.3A8.2A$9.2C28.2C28.2C28.2C28.2C28.2C$4.2C2.C.C23.2C
2.C.C23.2C2.C.C23.2C2.C.C23.2C2.C.C23.2C2.C.C$4.C3.C4.C20.C3.C4.C20.C
3.C4.C20.C3.C4.C20.C3.C4.C20.C3.C4.C$5.3C.5C21.3C.5C21.3C.5C21.3C.5C
21.3C.5C21.3C.5C$7.C.C27.C.C27.C.C27.C.C27.C.C27.C.C$7.C.C.3C23.C.C.
3C23.C.C.3C23.C.C.3C23.C.C.3C23.C.C.3C$8.2C.C2.C23.2C.C2.C23.2C.C2.C
23.2C.C2.C23.2C.C2.C23.2C.C2.C$4.3A6.2C20.2A6.2C19.3A6.2C20.2A6.2C19.
3A6.2C19.3A6.2C$6.A29.A29.A28.2A27.3A29.A$5.A30.A58.2A57.A.A3$3A$2.A$
.A33$2.A$3.A$.3A$9.2C28.2C28.2C28.2C28.2C28.2C$4.2C2.C.C23.2C2.C.C23.
2C2.C.C23.2C2.C.C23.2C2.C.C23.2C2.C.C$4.C3.C25.C3.C25.C3.C25.C3.C25.C
3.C25.C3.C$5.3C.4C22.3C.4C22.3C.4C22.3C.4C22.3C.4C22.3C.4C$7.C.C2.C
24.C.C2.C24.C.C2.C24.C.C2.C24.C.C2.C24.C.C2.C$3.3C.C.C23.3C.C.C23.3C.
C.C23.3C.C.C23.3C.C.C23.3C.C.C$2.C2.C.2C23.C2.C.2C23.C2.C.2C23.C2.C.
2C23.C2.C.2C23.C2.C.2C$2.2C6.2A20.2C6.2A20.2C6.3A19.2C6.2A20.2C6.3A
19.2C6.3A$10.A.A27.A29.A29.2A28.3A27.A$10.A29.A59.2A58.A.A!

There are cases where the second catalyst but not the first catalyst works (of which the left three shown are from a post by praosylen), but they are rarer.

Code: Select all

x = 122, y = 22, rule = B3/S23
7b2o18b2o18b2o18b2o18b2o18b2o$2b2o2bobo13b2o2bobo13b2o2bobo13b2o2bobo
13b2o2bobo13b2o2bobo$2bo3bo15bo3bo15bo3bo15bo3bo15bo3bo15bo3bo13bo$3b
3ob4o12b3ob4o12b3ob4o12b3ob4o12b3ob4o12b3ob4o9bo$5bobo2bo14bobo2bo14b
obo2bo14bobo2bo14bobo2bo14bobo2bo8bo$b3obobo13b3obobo13b3obobo13b3obo
bo13b3obobo13b3obobo11bo$o2bob2o13bo2bob2o13bo2bob2o13bo2bob2o13bo2bo
b2o3bo9bo2bob2o12bo$2o18b2o18b2o18b2o7b3o8b2o7bobo8b2o7b3o7b2o$7b3o17b
5o20bo16bobo5bo11bo2bo16bobo7b2o$10bo15b2o18b3o3b2o10bo5bobo2b2o11bo3b
o11bo5bobo6b2o$7bo37bo3bobo3bo8b2ob2ob2o5bo13bo12b2ob2ob2o7bo$49bobo18b
2o15bobo20b2o7bo$46bo6bob2o13bo39bo8bobo$44b2ob2o4bo5b2o13b3o13b5o4b2o
18bo$46bo13b2o14bo10b3o5bo4b2o$59bo16b2o21bo$70b3o2$62b3o37b3o$61bo2b
o36bo2bo$65bo39bo$65bo39bo!

By the way, while playing, I found a similar (cell-wise) catalyst, which also requires the table for at least some catalyses.

Code: Select all

x = 12, y = 12, rule = B3/S23
7b2o$2b2o2bobo$2bo3bo$3b3ob4o$5bobo2bo$b3obo$o2bob2o$2o6b3o$8bobo$8bo
2bo$9bo$9bobo!

This is similar to catalyses that a BTS or table supported in a certain way can do, but none of those three can always replace any of the other two.

Code: Select all

x = 53, y = 52, rule = B3/S23
7b2o13b2o$2b2o2bobo14bo$2bo3bo15bo$3b3ob4o11b2o2b2o17b2o$5bobo2bo14bo
bo17bo$b3obo14b4obo16b2obo$o2bob2o13bo2bob2o13bo2bob2o$2o6b3o17b3o9b2o
bo4b3o$8bobo17bobo12bo4bobo$8bo2bo16bo2bo11b2o3bo2bo$9bo19bo19bo$9bob
o17bobo17bobo9$7b2o13b2o$2b2o2bobo14bo$2bo3bo15bo$3b3ob4o11b2o2b2o17b
2o$5bobo2bo14bobo17bo$b3obo14b4obo16b2obo$o2bob2o5bo7bo2bob2o5bo7bo2b
ob2o5bo$2o6b3o17b3o9b2obo4b3o$8bobobo15bobobo10bo4bobobo$8bo2bo16bo2b
o11b2o3bo2bo$9bo19bo19bo$9bobo17bobo17bobo9$7b2o13b2o$2b2o2bobo14bo$2b
o3bo15bo$3b3ob4o11b2o2b2o17b2o$5bobo2bo14bobo17bo$b3obo14b4obo16b2obo
$o2bob2o13bo2bob2o13bo2bob2o$2o6b3o17b3o9b2obo4b3o$8bobo17bobo12bo4bo
bo$8bo2bo16bo2bo11b2o3bo2bo$9bo19bo19bo$11bo17bobo19bo!

[confocaloid]

Could Tutorials/Catalyses be turned into a Golly script?

[Hdjensofjfnen]

Could Tutorials/Catalyses be turned into a Golly script?

In what sense? Like a script that substitutes the correct catalysis for you if one exists?

[confocaloid]

Could Tutorials/Catalyses be turned into a Golly script?

In what sense? Like a script that substitutes the correct catalysis for you if one exists?

Well, "in some sense", that may be more of an open-ended question. There could be a script that substitutes the correct catalysis, or maybe some kind of an expert system.

[get_Snacked]

in this, the eater+ship works as a catalyst but the large object on the left does not:

Code: Select all

x = 27, y = 14, rule = B3/S23
10bo$7bobo$8bo16bo$b2o19bobo$bo2bob2o15bo$3b2ob2o$21b2o$3b5o12bobo$2b
o5bo11b2o$3bo2b2o$3o4bobo13b2o$o5bo2b3o11bo$6b2o4bo11b3o$11b2o13bo!

in this, both the objects work as catalysts:

Code: Select all

x = 27, y = 15, rule = B3/S23
8bo$10bo$7bobo13bo$8bo16bo$b2o19bobo$bo2bob2o15bo$3b2ob2o$21b2o$3b5o12b
obo$2bo5bo11b2o$3bo2b2o$3o4bobo13b2o$o5bo2b3o11bo$6b2o4bo11b3o$11b2o13b
o!

is there a case where the object on the left can catalyse using its block but the eater+ship cannot catalyse using its ship?
EDIT: here is a stator reduction of the left catalyst and an alternative to it in addition:

Code: Select all

x = 33, y = 16, rule = B3/S23
7bo17bo$9bo17bo$6bobo15bobo$7bo11bo5bo$2o16bobo$o2bob2o12bobob2o$2b2o
b2o14bob2o$20bo$2b5o13bob3o$bo5bo13bo3bo$b2o2b2o16bob3o$6bobob2o9bob2o
3bo$5bo2b2obo8bobo3b2o$5b2o13bobo4bobob2o$21bo4bo2b2obo$26b2o!

(the alternative will NEVER have a special case where the regular catalyst can't work)

[Entity Valkyrie 2]

is there a case where the object on the left can catalyse using its block but the eater+ship cannot catalyse using its ship?

Code: Select all

x = 25, y = 14, rule = B3/S23
7bo13bo$6bo13bo$6bo13bo$7bo13bo$2o$o2bob2o12b2o$2b2ob2o11bobo$18b2o$2b
5o$bo5bo13b2o$b2o2b2o14bo$6bobob2o10b3o$5bo2b2obo12bo$5b2o!

(the alternative will NEVER have a special case where the regular catalyst can't work)

Code: Select all

x = 33, y = 17, rule = B3/S23
3bo17bo$2ob3o12b2ob3o$b2o3bo12b2o3bo$6bo17bo$7bo11bo5bo$2o16bobo$o2bob
2o12bobob2o$2b2ob2o14bob2o$20bo$2b5o13bob3o$bo5bo13bo3bo$b2o2b2o16bob
3o$6bobob2o9bob2o3bo$5bo2b2obo8bobo3b2o$5b2o13bobo4bobob2o$21bo4bo2b2o
bo$26b2o!

[hotcrystal0]

in this, the eater+ship works as a catalyst but the large object on the left does not:

Code: Select all

x = 27, y = 14, rule = B3/S23
10bo$7bobo$8bo16bo$b2o19bobo$bo2bob2o15bo$3b2ob2o$21b2o$3b5o12bobo$2b
o5bo11b2o$3bo2b2o$3o4bobo13b2o$o5bo2b3o11bo$6b2o4bo11b3o$11b2o13bo!

That “large object” is the grin reagent.
Also, when the marked cell survives with three neighbors in the grin reagent catalysis, eater bridge snake cannot replace it:

Code: Select all

x = 22, y = 14, rule = LifeHistory
7.A11.A$9.A11.A$6.A.A9.A.A$7.A11.A$2A$A2.A.2AD9.2AD$2.2A.2A6.2A.A.A$13.
A.2A.A.A$2.5A12.2A$.A5.A$.2A2.2A$6.A.A.2A$5.A2.2A.A$5.2A!

Edit: grin reagent can also (sometimes) work when ship+eater recovers too quickly:

Code: Select all

x = 24, y = 13, rule = B3/S23
6bo11bo$6bobo9bobo$7bo2bo8bo2bo$2o8b2o10b2o$o2bob2o4bo5b2o4bo$2b2ob2o
9bobo$16b2o$2b5o$bo5bo11b2o$b2o2b2o12bo$6bobob2o8b3o$5bo2b2obo10bo$5b
2o!

This should probably be added to Tutorials/Catalyses.

[Entity Valkyrie 2]

Here is a catalyst based on a P16 oscillator by get_Snacked:

Code: Select all

x = 17, y = 13, rule = B3/S23
b2o7b2o$bobo6bo$3bo4bobo$3b2o3b2o$b2o$o2b4o$2obo3bo$3bob2o4bo4bo$4obo
4bobo3bo$o4bo3bo2bo3bo$2bobo5b2o2bo$b2ob2o7bobo$14bo!

Here is a variant with an extra eater 1, eating a tub:

Code: Select all

x = 18, y = 13, rule = B3/S23
b2o7b2o$bobo6bo$3bo4bobo$3b2o3b2o7bo$b2o12b3o$o2b4o7bo$2obo3bo6b2o$3bo
b2o4bo$4obo4bobo$o4bo3bo2bo$2bobo5b2o2bo$b2ob2o7bobo$14bo!

[Tawal]

Unusual pre-Phi spark to Glider :

Code: Select all

x = 43, y = 13, rule = B3/S23
8b2o28b2o$2o3b2o2bo20b2o3b2o2bo$2o2bobobo21b2o2bobobo$4bobob2o24bobob
2o$4obobo22b4obobo$o2bobobob3o18bo2bobobob3o$3bobobobo2bo20bobobobo2bo
$4b2ob2o2b2o21b2ob2o2b2o2$2bo29b3o$bob3o25bo3bo$o2b2o26bo3bo$2b2o28b3o
!

[Tawal]

[…]
Edit: grin reagent can also (sometimes) work when ship+eater recovers too quickly:

Code: Select all

x = 24, y = 13, rule = B3/S23
6bo11bo$6bobo9bobo$7bo2bo8bo2bo$2o8b2o10b2o$o2bob2o4bo5b2o4bo$2b2ob2o
9bobo$16b2o$2b5o$bo5bo11b2o$b2o2b2o12bo$6bobob2o8b3o$5bo2b2obo10bo$5b
2o!

This should probably be added to Tutorials/Catalyses.

With the same active region, the Grin Reagent works in different cases :

Code: Select all

x = 99, y = 21, rule = B3/S23
49b2o$49bo4b2o$51bobobo$50b2obo$53bo$16b2o32b2obobob2o$16bo33b2obob2ob
o$o16bo22bo13bo25bo$obo13b2o22bobo13b2o22bobo$bo2bo9bo26bo2bo12bo23bo
2bo11b2o$4b2o4b2obob2obo25b2o10bo27b2o10bo$5bo4b2obobob2o26bo10b2o27bo
11bo$13bo82b2o$10b2obo80bo$11bobobo74b2obob2obo$9bo4b2o74b2obobob2o$9b
2o82bo$90b2obo$91bobobo$89bo4b2o$89b2o!

[get_Snacked]

With the same active region, the Grin Reagent works in different cases :

Code: Select all

x = 99, y = 21, rule = B3/S23
49b2o$49bo4b2o$51bobobo$50b2obo$53bo$16b2o32b2obobob2o$16bo33b2obob2ob
o$o16bo22bo13bo25bo$obo13b2o22bobo13b2o22bobo$bo2bo9bo26bo2bo12bo23bo
2bo11b2o$4b2o4b2obob2obo25b2o10bo27b2o10bo$5bo4b2obobob2o26bo10b2o27bo
11bo$13bo82b2o$10b2obo80bo$11bobobo74b2obob2obo$9bo4b2o74b2obobob2o$9b
2o82bo$90b2obo$91bobobo$89bo4b2o$89b2o!

replacements for all three cases:

Code: Select all

x = 94, y = 19, rule = B3/S23
51b2o$51bo$52bo$51b2o$50bo$16b2o32b3o$o15bo23bo12bo26bo$obo11bobo23bo
bo9b2o26bobo$bo2bo9b2o25bo2bo36bo2bo$4b2o4b2o32b2o38b2o$5bo4bobo32bo39b
o$11b2o79b2o$93bo$90b3o$90bo$91b2o$92bo$91bo$91b2o!

[Tawal]

Does the yellow catalyst known (2 variants) ?
Does it have another forms ?

Code: Select all

x = 41, y = 19, rule = LifeHistory
9.A29.A$8.A.A27.A.A$7.A2.A26.A2.A$2.3A.2A24.3A.2A$2.A.A.2A24.A.A.2A$
2A2.A4.A20.2A2.A4.A$A4.A3.A20.A4.A3.A$3A5.A21.3A5.A$3.A2.2A25.A2.2A$
3.A.A27.A.A$3.3A27.3A2$7.2E28.2E$4.E2.E26.E2.E$3.E.E.E25.E.E.E$3.2E2.
E.2E22.2E2.2E$7.2E.E26.E$39.E$38.2E!

[Tawal]

Unusual pre B to G :

Code: Select all

x = 38, y = 7, rule = LifeHistory
30.2A$30.2A3$3A27.3C$A2.A26.C2.C2.2A$4.A29.C.2A!
#C [[ Z 8 ]]

[Tawal]

[…] using a weld I am sure can reduce many guns of this form.[…]

This weld is cheaper :

Code: Select all

x = 62, y = 10, rule = LifeHistory
6.C3.2C34.A3.2A$5.C.C3.C.E2.E.2E25.A.A3.A4.A.2A$4.C.C3.C2.4E.E11.D13.
A.A3.A3.3A.A$2C.C.C3.C8.E.E10.D8.2A.A.A3.A3.A4.A.A$2C.C2.4C.C3.2E2.2E
11.D7.2A.A2.4A.A2.A3.2A.A$4.C.C3.C.C2.E9.9D10.A.A4.3A7.A$2C.2C2.C2.C.
C3.E15.D7.2A.2A.A.A.A7.3A$.C.C2.2C3.C3.2E14.D9.A.A3.2A.2A6.A$.C.C26.D
10.A.A$2.C39.A!

Edit:
By “cheaper” I mean one cell less, as with the BB.

[WhiteHawk]

[…] using a weld I am sure can reduce many guns of this form.[…]

This weld is cheaper :

Code: Select all

Edit:
By “cheaper” I mean one cell less, as with the BB.

That's not the weld in question, it's this one (May have been missed previously since shifting it 1 diagonal closer fails and only a 2d shift works)

Code: Select all

x = 29, y = 8, rule = LifeHistory
4.2D$3.D.D9.D11.2A$3.D2.2A8.D9.A.A$2A.D.A.A9.D8.A$2A.2DA5.8D4.2A.A$4.
2A11.D5.2A.2A$16.D$15.D!

[Anivec]

Sorry for necroposting, but there seems to be another family of catalysts:

Code: Select all

x = 131, y = 40, rule = LifeHistory
75.D3.D.3D.D3.D$75.2D2.D.D3.D3.D$75.D.D.D.2D2.D.D.D$75.D2.2D.D3.D.D.D
$75.D3.D.3D2.D.D3$82.D$12.2D2.D3.3D59.D$11.D2.D.D3.D2.D58.D$11.D2.D.D
3.D2.D12.95D$11.D2.D.D3.D2.D12.D93.D$12.2D2.3D.3D13.D93.D3$131F$F35.F
33.F29.F29.F$F35.F33.F29.F29.F$F35.F33.F29.F29.F$F35.F33.F29.F29.F$F18.
E16.F17.2E2.2E10.F7.2A20.F18.E10.F$F17.E.E15.F17.E3.E11.F29.F7.3A7.E.
E9.F$F17.E.E15.F19.E.E11.F7.A2.A4.2E.2E9.F17.E.E9.F$F16.2E.2E14.F18.3E
3.2E7.F8.3A4.E.2E.E8.F9.A6.2E.2E8.F$F8.3A9.E14.F14.A9.E.E6.F9.2A9.E8.
F9.3A8.E8.F$F9.A.3A2.C3E15.F15.A4.3E.E.E6.F16.3E.E.2E5.F12.A3.3E.E.2E
5.F$F8.2A.2A2.C19.F16.A2.C3.E.E7.F11.3A.C3.E.E.E5.F12.A2.C3.E.E.E5.F$
F8.2A.2A2.C.E17.F13.A2.A2.C.C.E9.F11.2A2.C.C.E9.F12.A2.C.C.E9.F$F10.A
5.2C17.F16.A3.CE.CE8.F8.A.2A4.CE.CE8.F10.2A4.CE.CE8.F$F35.F13.2A18.F8.
A.2A17.F29.F$F19.CE14.F14.A18.F9.A19.F29.F$F19.E.E13.F33.F8.A20.F29.F
$F21.E13.F23.2E8.F9.A9.2E8.F19.2E8.F$F21.2E12.F24.E8.F9.A10.E8.F20.E8.
F$F35.F23.E9.F19.E9.F19.E9.F$F35.F23.2E8.F19.2E8.F19.2E8.F$F35.F33.F29.
F29.F$F35.F33.F29.F29.F$F35.F33.F29.F29.F$131F!

They seem to be relatively common in occurrences too.

Another variant:

Code: Select all

x = 12, y = 12, rule = B3/S23
6b2o$7bo2b2o$7bobobo$4b2obo2bo$2o2bo2bo$2o3b2o2$5bo$4b3o$3b2o2bo$7b2o
$6b2o!

[hotcrystal0]

Another variant:

Code: Select all

x = 12, y = 12, rule = B3/S23
6b2o$7bo2b2o$7bobobo$4b2obo2bo$2o2bo2bo$2o3b2o2$5bo$4b3o$3b2o2bo$7b2o
$6b2o!

What about the one used in that one U-turner conduit?

Code: Select all

x = 18, y = 17, rule = B3/S23
10bo$9bobo$9bobo$8b2ob2o$12bo$3bo4b4o$4bo2bo$o3bo2bobo$o3bo3b2o$2b2o12b
2o$11b2obo2bo$10bobob3o$7bo2bobo$7b4ob3o$11bo3bo$9bobo2b2o$9b2o!

[Tawal]

Neither CatForce (Big list) or LightCone found a solution to clean this reaction at the end of a conduit (H-to-G solved here).

Code: Select all

x = 29, y = 34, rule = LifeHistory
7B6.2A$.7B3.2B2AB$.9B.4B$2.15B$.16B$.16B$.17B$.18B$20B$.19B$.19B$2.9B
3E9B$3.7BE3BE3B2E2B2D$2.8BE3BE3B2EBD2BD$3.7BE3BE7B2D$5.6B3E9B$4.16B$
4.16B$3.2A14B$3.2A15B$4.B.16B$6.17B$7.16B$8.13B.B2A$9.B2.4B.4B.BA.A$
14.2B.4B4.A$13.2B3.4B3.2A$12.B2AB3.4B$13.2A5.4B$21.4B$22.4B$23.4B$24.
4B$25.4B!

So I launched a not too complicated Bellman search.
It found this catalyst (with completion by me) that works but doesn't clean the area :

Code: Select all

x = 30, y = 34, rule = LifeHistory
7B6.2A$.7B3.2B2AB$.9B.4B$2.15B$.16B$.16B$.17B$.18B6.2E$20B4.E2.E$.19B
4.E.E.E$.19B3.2E2.E.E$2.9B3A6B5.E.E.E$3.7BA3BA3B2A3.2E.E.E$2.8BA3BA3B
2A2.E3.E$3.7BA3BA5B3.2E.2E$5.6B3A6B4.E.E$4.16B3.E2.E$4.16B4.2E$3.2A
14B$3.2A15B$4.B.16B$6.17B$7.16B$8.13B.B2A$9.B2.4B.4B.BA.A$14.2B.4B4.A
$13.2B3.4B3.2A$12.B2AB3.4B$13.2A5.4B$21.4B$22.4B$23.4B$24.4B$25.4B!

May be this catalyst is new, or does it have a replacement ?

Edit:
I don't know why CatForce or LightCone didn't find this transparent Beehive.

[splitterrules]

Smaller:

Code: Select all

x = 29, y = 34, rule = LifeHistory
7B6.2A$.7B3.2B2AB$.9B.4B$2.15B$.16B$.16B$.17B$.18B6.2E$20B4.E.E$.19B
4.E$.19B3.2E$2.9B3A6B5.2E$3.7BA3BA3B2A3.2E2.E$2.8BA3BA3B2A2.E3.E$3.7B
A3BA5B3.2E.2E$5.6B3A6B4.E.E$4.16B3.E2.E$4.16B4.2E$3.2A14B$3.2A15B$4.B
.15B$6.17B$7.16B$8.13B.B2A$9.B2.4B.4B.BA.A$14.2B.4B4.A$13.2B3.4B3.2A$
12.B2AB3.4B$13.2A5.4B$21.4B$22.4B$23.4B$24.4B$25.4B!

[Tawal]

Useless but semi-transparent Eater1 :

Code: Select all

x = 0, y = 0, rule = LifeHistory
16.2E$17.E$C13.3E$C.C11.E$3C$2.C!