Past Winning Strategies

• Spring, 2024: GOB (submitted by Gracelynn Osei-Bosompem, Sociology)
• Spring, 2025: Vincent (submitted by James Mars, Economics & Sociology)
• Spring, 2026: ZICHFORZACH (submitted by Zachary Weiner, Sociology)

Rules of the Game

The rules of the iterated prisoner’s dilemma are as follows:

1. Each player plays against each other as well as a copy of themselves in a n_rounds = 50 move iterated prisoners dilemma
2. The whole tournament is run n_iter = 5 times to reduce stochastic variability
3. The payoff structure is:
   • mutual cooperation: 3 points
   • mutual defection: 1 point,
   • temptation payoff: 5 points,
   • sucker’s payoff: 0
4. Three strategies are added by default: TITFORTAT, RANDOM, and THEPROF. If no strategy is able to win against THEPROF, TITFORTAT, or RANDOM, these strategies are iteratively excluded and the tournament rerun. (Unfortunately, no strategy was able to achieve a higher score than THEPROF so far.)

Scoreboard of Past Tournaments

Spring 2024
Spring 2025
Spring 2026