Alright, thank you. As far as the last paragraph goes, I took it of course more on the "metaphorical" level. I agree their evolutionary agent might be too restricted to be fully interesting (though it is valuable if their inferiority is demonstrated analytically not only from simulations).

Since it seems you have lot's of experience with IPD, what do you think about the case B)? The paper makes the claim specifically for the ZD strategies, but do you think this "superrationally" result could generalize to any strategy which has also a theory of mind? On the other hand Hofstadter's idea was in the context of one-shot PD, so this might be not apply in general at all... I need to learn more about this subject...