A Puzzle for Counterfactual Decision Theory

The following feels like a purely technical problem for standard versions of causal decision theory, and it should yield to a purely technical solution, but the said solution wasn’t immediately obvious to me, so I’m posting the puzzle here.

Decision Theory Course

One of the courses I’ll be teaching this semester is 483 – Philosophy of Choice & Decision. Despite the course number starting with ‘4’, which might be interpreted as a sign the course is pitched at 4th year (i.e. senior) students this is basically a grad class that is meant to be accessible to good …

Is there a rational strategy in Finite Iterated Prisoners Dilemma?

(UPDATE: I think there’s a mistake in the argument here – see Bob Stalnaker’s comment 11 below.) Row and Column are going to play 100 rounds of Prisoners Dilemma. At each round they can either play Co-op or Defect, with standard rules. (So the payoffs are symmetric, and on each round Defect dominats Co-op for …