saturn comments on Harry Potter and the Methods of Rationality discussion thread, part 2 - Less Wrong
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TDT says: I cooperate iff (you will cooperate iff I cooperate).
Honorable says: I cooperate iff you will cooperate.
It seems to me that, although Honorable is suboptimal if it meets an unconditional cooperator, TDT will cooperate with it because it meets the condition that TDT cares about.
On reflection, your conclusion is obviously right: playing PD against Honorbot is simply playing Newcomb's Dilemma, so TDT cooperates.
I was misled by the recent realization that TDT doesn't actually work out to "I cooperate iff (you will cooperate iff I cooperate)".