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A Note on a GRIM Game of Repeated Prisoner's Dilemma...

Tom Slee Tells Us That Game Theorist Anatol Rapoport Has Died

Rapoport's "Tit-for-Tat" solution to repeated prisoner's dilemma has two huge things going for it:

  1. You cannot exploit it. You are always better off cooperating than attempting to game it.
  2. It's simple, so it's easy to figure out what it is and what it is doing.

These are two very powerful advantages in any strategic interaction.

Crooked Timber: Anatol Rapoport has died at the age of 95. Among many contributions, perhaps his most widely-known was the Tit-for-Tat rule for repeated games of the Prisoner's Dilemma, embodied in a four-line program Rapoport successfully entered in a contest run by Robert Axelrod. Rapoport's program co-operates inititially, and thereafter matches the other player's last action, defecting in response to a defection, and returning to co-operation if the other player does so...