toroidalet wrote:P16 Ga backrake:Code: Select all`x = 8, y = 13, rule = B2eic3ic4rnj5ink/S12aein4qiyne5re6aei8`

4bobo$7bo$4bobo$2bo$2bo$4bobo$7bo$bo2bobo$obo$obo$bo2bobo$7bo$4bobo!

I think this one is smaller than the other known ones.

EDIT: p6Code: Select all`x = 6, y = 7, rule = B2cei3ci4jnr5ikn/S12aen3c4einqy5er6aei8`

2o2b2o$o4bo2$b3o2$o4bo$2o2b2o!

EDIT2: a potential c/3Code: Select all`x = 5, y = 9, rule = B2cei3ci4jnr5ikn/S12aen3c4einqy5er6aei8`

bo$2o$bo2$2b3o2$bo$2o$bo!

probably useless.

EDIT3: a better oneCode: Select all`x = 6, y = 5, rule = B2cei3ci4jnr5ikn/S12aen3c4einqy5er6aei8`

3b2o$5bo$3o2bo$5bo$3b2o!

Not sure if you realised, but the backrake works in the x-rule precursor rule (aka "pre-x-rule"), whilst the p6 and c/3 reactions are in the precursor variant rule which I accidentally posted after incorrectly determining the Hensel notation for the isotropic rule (aka "x-rule-pre")

I don't think I searched for spaceships in the x-rule-pre rule but in the actual x-rule precursor rule I ran a battery of searches with modified gfind. Here is a summary of the unsuccessful results for c/3:

Unsuccessful search results, c/3:

asymmetric, width 22

odd bilaterally symmetric, width 43

even bilaterally symmetric, width 44

Unsuccessful search results, 2c/6:

glide symmetric, width 22/23

odd bilaterally symmetric, width 23

even bilaterally symmetric, width 24

Unsuccessful search results, 3c/9:

odd bilaterally symmetric, width 13

even bilaterally symmetric, width 14

Unsuccessful search results, 4c/12:

odd bilaterally symmetric, width 9

even bilaterally symmetric, width 10

Unsuccessful search results, 5c/15:

odd bilaterally symmetric, width 7

even bilaterally symmetric, width 8

Even though this doesn't translate directly to x-rule-pre, I think it's safe to say that those reactions aren't particularly promising frontends as very little of the partial is reproduced and it doesn't look easy to modify the reaction to create the required sparks and keep the reaction going.