Tit For Tat and Random - Repeat opponent's last choice skewed by random
setting.*
Tit For Two Tats and Random - Like Tit For Tat except that opponent must
make the same choice twice in a row before it is reciprocated. Choice is skewed
by random setting.*
Tit For Two Tats - Like Tit For Tat except that opponent must make the same
choice twice in row before it is reciprocated.
Naive Prober (Tit For Tat with Random Defection) - Repeat opponent's last
choice (ie Tit For Tat), but sometimes probe by defecting in lieu of
co-operating.*
Remorseful Prober (Tit For Tat with Random Defection) - Repeat opponent's
last choice (ie Tit For Tat), but sometimes probe by defecting in lieu of
co-operating. If the opponent defects in response to probing, show remorse by
co-operating once.*
Naive Peace Maker (Tit For Tat with Random Co-operation) - Repeat opponent's
last choice (ie Tit For Tat), but sometimes make peace by co-operating in lieu
of defecting.*
True Peace Maker (hybrid of Tit For Tat and Tit For Two Tats with Random
Co-operation) - Co-operate unless opponent defects twice in a row, then defect
once, but sometimes make peace by co-operating in lieu of defecting.*
Random - always set at 50% probability.
Always Defect
Always Co-operate
Grudger (Co-operate, but only be a sucker once) - Co-operate until the
opponent defects. Then always defect unforgivingly.
Pavlov (repeat last choice if good outcome) - If 5 or 3 points scored in the
last round then repeat last choice.
Pavlov / Random (repeat last choice if good outcome and Random) - If 5 or 3
points scored in the last round then repeat last choice, but sometimes make
random choices.*
Adaptive - Starts with c,c,c,c,c,c,d,d,d,d,d and then takes choices which
have given the best average score re-calculated after every move.
Gradual - Co-operates until the opponent defects, in such case defects the
total number of times the opponent has defected during the game. Followed up by
two co-operations.
Suspicious Tit For Tat - As for Tit For Tat except begins by defecting.
Soft Grudger - Co-operates until the opponent defects, in such case opponent
is punished with d,d,d,d,c,c.
