Kindly comments on Paper: Iterated Prisoner’s Dilemma contains strategies that dominate any evolutionary opponent

[Kindly]

Here’s the first strategy that is explicitly stated (in the context of the 5/​3/​1/​0 payouts):

• If the last outcome was CC, cooperate with probability ¹¹⁄₁₃.

• If the last outcome was CD, cooperate with probability ¹⁄₂.

• If the last outcome was DC, cooperate with probability ⁷⁄₂₆.

• If the last outcome was DD, defect.

This supposedly “enforces an extortion factor of 3”, whatever that means.