Iterated prisoner’s dilemma

This is an iterated prisoner’s dilemma between yourself and 9 unknown opponents. Each match will last for 10 rounds and you’ll only know who was your opponent at the end of the match. For each round, you must choose between Cooperate (C) or Defect (D).

The payment matrix is :

C D
C [3,3] [0,5]
D [5,0] [1,1]

In words:

  • If you both cooperate ([C,C]), you'll get 3 points each;
  • If you cooperate while your opponent defects ([C, D]), you'll get 0 points but he'll get 5 points;
  • If you defect while your opponent cooperates ([D, C]), you'll get 5 points and he'll get nothing;
  • If you both defect ([D,D]), you'll get 1 point each.

The number of points earned by each of you during one specific match are calculated at the bottom of the tables and you'll get you total score at the end of the post.

Ready? Let's start!

Match 1

This is round 1. What do you do?



You Opponent
- -
- -
- -
- -
- -
- -
- -
- -
- -
- -
0 0
Match 2

This is round 1. What do you do?



You Opponent
- -
- -
- -
- -
- -
- -
- -
- -
- -
- -
0 0
Match 3

This is round 1. What do you do?



You Opponent
- -
- -
- -
- -
- -
- -
- -
- -
- -
- -
0 0
Match 4

This is round 1. What do you do?



You Opponent
- -
- -
- -
- -
- -
- -
- -
- -
- -
- -
0 0
Match 5

This is round 1. What do you do?



You Opponent
- -
- -
- -
- -
- -
- -
- -
- -
- -
- -
0 0
Match 6

This is round 1. What do you do?



You Opponent
- -
- -
- -
- -
- -
- -
- -
- -
- -
- -
0 0
Match 7

This is round 1. What do you do?



You Opponent
- -
- -
- -
- -
- -
- -
- -
- -
- -
- -
0 0
Match 8

This is round 1. What do you do?



You Opponent
- -
- -
- -
- -
- -
- -
- -
- -
- -
- -
0 0
Match 9

This is round 1. What do you do?



You Opponent
- -
- -
- -
- -
- -
- -
- -
- -
- -
- -
0 0
Conclusion

Still there? Great!

  • Always Defects always defects regardless of what you do;
  • Tit-for-Tat cooperates first and then reproduce your last move;
  • Grudger cooperates until you defect; then defects all the time;
  • Always Cooperates always cooperates regardless of what you do;
  • Detective cooperates, defects, cooperates then checks what you did on the 3rd round: if you haven't retaliated, it defects all the time; otherwise it plays Tit-for-Tat;
  • Random just cooperates or defect randomly (with a probability of 1/2);
  • Win-Stay-Lose-Shift cooperates first then, if you've cooperated on the last round, repeat its last move; otherwise switches;
  • Tit-For-Two-Tats same as Tit-for-Tat but only retaliates after two defections in a row;
  • Alternates defects first and then just alternates regardless of what you do.

Your total score is 0 points. Please, tell me how much you've made (either in the comments below or on Twitter) and explain how you did it.

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