[mythtv-users] Bounded Duplicate Policy

[MythTV]

Hi All

I have been watching a particular show which airs many times a day with
occasional new episodes sprinkled in.

MythTV cleverly records only what I have not seen, episodes which are
new
or at least new to me.

How can I set up a recording rule which ensures new or at least, unseen
episodes get recorded, and a few repeats occasionally, maybe if the last
showing was greater than say, 90 days.

Is this possible?  I assume a custom rule with a power search is
required,
but what info is available to the power rule? How complex can such a
rule be?

Dave