I have lost to a SS launch, so it does happen.
Interesting, did you trade any of the necessary techs to the AI, or did it do all of its own research?
Also, is there any evidence of the AI doing what I would call collective research? I.E., each AI civilization researches a different tech and then trades it to all of the others.
So it would appear then that the more AI civilizations in contact with each other, trading advances, the harder it will be for the Human player to stay ahead. It this a correct assumption?