Prisoner's Dilemma Tournament

The field

Every strategy plays every other one. Choose at least two.

• Tit for Tat Cooperates first, then copies your last move.
• Always Defect Defects every round, whatever you do.
• Grudger Cooperates until you defect once, then never forgives.
• Random Flips a coin each round. Seeded, so the same run repeats.
• Always Cooperate Cooperates every round, no matter what.
• Tit for Two Tats Forgives one defection; answers two in a row.
• Pavlov Win-stay, lose-shift: repeats a move that paid, switches one that did not.
• Suspicious Tit for Tat Tit for Tat that opens with a defection.

The rules