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I recently posted a 3-glider synthesis in the B38/S23 thread:
It was found with gencols and a script of chris_c's.

72c20e wrote:

Code: Select all

x = 15, y = 36, rule = B38/S23
bo$2bo$3o14$13bo$12bo$12b3o2$11bo$12bo$10b3o4$12b3o$12bo$13bo2$10bo$8b
obo$9b2o$6b2o$5bobo$7bo!

The whole reaction works just fine in plain-vanilla Life. So there's one easy line of attack that doesn't involve recompiling gencols. There may well a three-glider collision in B3/S23 that produces one of these low-bit-count predecessors, and also works in B38/S23:
So you (or someone) could use chris_c's method and script, maybe with a filter like the one biggiemac suggested, to look for patterns with population sequence

9, 10, 9, 14, 12, 20, 12, 12, 12...
10, 9, 14, 12, 20, 12, 12, 12...
9, 14, 12, 20, 12, 12, 12...

EDIT: Ha, Goldtiger997 got in ahead of me with an actual answer, copied from this thread. I'll leave this here since it has the actual details on chris_c's script.

Thanks a lot!
I joined the forum a long time ago , but I still don't know much about cgol.I have another question.
How to find glider construction of spaceships?

72c20e wrote:Thanks a lot!
I joined the forum a long time ago , but I still don't know much about cgol.I have another question.
How to find glider construction of spaceships?

The following applies for non-CGOL rules
That depends: do you mean "find" as in "how to create a synthesis" or "how to locate an existing synthesis"?
If it's the former, then depending on the sort of rule you're looking at and the complexity of the spaceship in question either look for a predecessor that resembles something you can build or just start smashing things together and look at what comes out.
If you're asking about the latter, then check the corresponding thread if it exists. If no synthesis (or thread) exists then you're likely looking in uncharted territory.
If you're talking about specifically CGOL, then spaceship synthesizing follows the "look for viable predecessors" path and spaceship syntheses will either be in the spaceship synthesis thread, their respective LifeWiki pages, entries on Niemiec's site, or some combination of the three.