There are 3 ways of playing the IPD
1) Let two strategies play for 200 rounds
2) Let one strategy play all others for 200 rounds
3) Play against a strategy yourself
The image below shows what happens to the average score when all strategies in this implementation of the IPD compete in a 'scratch' tournament.
The strategy that has the lowest average score at the end of every round is removed from the track (the 'scratch' is a discipline in track cycling),
the score is calculated by matching every strategy against every other strategy, itself included, for 200 rounds. What happens is clear and as expected from the original Axelrod tournaments:
the nice guys win as the ones looking for a cheap advantage to bring them above the magic three-points-average will ultimately fail to find an exploitable prey.