Is "pass-force" a generalisation of "play-force"? That is, if a player can play-force a condition C, is it necessarily true that the same player can also pass-force C by using the same strategy with a pass appended to each variation? If not, can you show a counter-example?

Can you give an example where a condition can be pass-forced but not play-forced?

I realise that I am being demanding here, but it is much easier to understand technical definitions if many examples are provided :-)

Thanks, this answers half of my question very well. The molasses ko examples do include situations in which black can pass-force a condition but not play-force the same condition.

Now what I am looking for is an example of a position in which black can play-force some condition but can not pass-force the same condition; or else a proof that such an example can not exist.

(Perhaps my use of the word "generalisation" was misleading or even incorrect. My apologies for any confusion.)