> 1) How do I save the best-of-generation individual to a file each
> generation (or every N generations)? My individuals are too large to
> print, and I'd like to do some other things with them after I evolve
> them.
You write your individuals file. You need naming definition like
"simulation"_+"generation"_id.
And you just write your customized individual/population writing method. In
java there are quite
standard ways to write file so kind of don't understand question.

> 2) As mentioned, I'm coevolving Go players. To see that I'm making
> progress, I'd like to test the best-of-generation individual against
> a