[dstorrs]

You do realize that Tit For Tat is the dominant strategy of PD, right? [1]

[1] Ok, not strictly true. Other strategies can dominate under certain conditions (finite and pre-known number of iterations, possibility of signal error, etc) but I don't feel that those conditions apply in this case.

[gringomorcego]

This prisoner's dilemma has one round with different rewards.

Also, don't correct people with 'you do realize' because it makes you seem like an asshole.